8 optix wdm commissioning guide 20080526 a

HUAWEI TECHNOLOGIES CO., LTD.

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Huawei Confidential

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Jiang Lvyong 120335

Lv Zhenhua 60476

OptiX WDM Commissioning Guide

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

Forward

Based on the WDM commission, we develop this course. The aim of this course is to help engineers grasp the deployment and commission of WDM products.


Guideline

The content of this course is

organized according to OptiX BWS

1600G Debugging and

Commissioning Guide.

Before study this course, recommend

you to study OptiX BWS 1600G

Debugging and Commissioning Guide.

The emphases and difficulty of this

course is the optical power

Commissioning.


References

OptiX BWS 1600G Backbone

DWDM Optical Transmission

System Commissioning Guide

OptiX BWS 1600G Backbone

DWDM Optical Transmission

System Configuration Guide

OptiX

BWS 1600G Commissioning Guide


Objectives

Upon completion of this course, you

will be able to:

Know the operation steps of WDM

commission

Understand the characteristic of WDM

commission

Master the methods to WDM commission


Contents

Preparation for Commissioning

Commissioning Requirement

and Method

System Commissioning

Check the Result of

Commissioning


Contents

Preparation for

Commission Document Preparation

Tools Preparation

Commission Precaution


Preparation of Commissioning Documents

Documents that should be prepared before the commissioning:

Engineering design documents:

Wavelength allocation diagram (providing the wavelength IDs at every station, service relation between

stations (add, drop, or pass through), and wavelength protection relation)

Network datasheet (NE name, NE ID, and orderwire data)

OA configuration diagram (the configuration and attenuation of OAs)

Slot allocation diagram of every cabinet (indicating the position of the upper subrack, NE names, and NE IDs)

Cabinet fiber connection diagram (describing the fiber connections inside a cabinet and the fiber jumper

connections outside the cabinet)

Project information: Consult with the project manager to understand what cooperation that the customer can offer,

the project progress, test requirements (test equipment, test items, and test scope), vehicle arrangement, and

functions of the equipment involved in the project.

Test records tables: Including the Optical Power Adjustment Records Table and the Acceptance Test Report. The

Optical Power Adjustment Records Table should be produced based on the slot allocation and signal flow as well

as the fiber connections before the commissioning so that you can keep records in the table accordingly during the

power adjustment.

Optical netword WDM test date table


Preparation for Commission Tools Preparation

Instrument:

Optical spectrum analyzer( including Tesgine2500), optical power

meter;

SDH analyzer, SmartBits meter, and other meter with special service;

more information refer to Acceptance Guide to WDM Products

Accessories:

Fiber jumper used for debugging (two separately for FC/PC-FC/PC,

LC/PC-LC/PC and LC/PC-FC/PC);

fixed attenuator (5dB, 7dB, 10dB and 15dB), flange used for debugging

Cassette cleaner or lens tissue used to clean the end faces of fibers.

As for important deployment or extension project, we must prepare

Fiber microscope.


Preparation for Commission Commissioning Precautions

Before commissioning, the installation engineer must work out the hardware quality check

report. The installation engineer must ensure that the quality of the installation project does

not affect later commissioning. In particular, pay attention to how the installation

engineer test the installed fibers.

The instruments involved in testing need to be calibrated. The instruments that need

to be grounded must be well grounded.

The error introduced by the accessories involved in testing (including fiber jumpers and

flange) must be calculated in the test values.

Fibers must be cleaned during the system commissioning process. When you clean the

fibers, you must use the special fiber cleaner, and use the fiber microscope to check

whether the fiber interface is clean. Use lint-free wipes or (cassette cleaner) to clean the

fiber jumper interface. Use the compressed air dedusting agent to clean the female

connector.

All paths must be involved in the system commissioning. You need to commission all

wavelengths that transmit optical power, to ensure that all paths that are initially configured

are in the optimum status.

Record the commissioning data in details (optical amplifier unit, input and output optical

power of the OTU).


Question

Question:

1. If there are problems with the center wavelengths of multiple OTU boards that we test, what is the most probable problem?

2. Do we need to clean fibers during the WDM system commissioning process?

Answer:

1. The instrument is faulty or is not calibrated. 2. Fibers must be cleaned.


Summary

In this chapter, we have learned:

Document Preparation

Tools Preparation

Commission Precaution


Contents



and Method


Check the Result of

Commissioning


Content

Commission Requirement

and Method System Limitations

Optical amplifier unit

Optical Transponder Unit

Other units


System Limitations Received optical power: The received optical power must be in the standard

range. The power fluctuation of the system might happen. Hence, the received optical power should be set around the standard central value to ensure sufficient margin.

OSNR: The OSNR directly affects the system performance. The main factors determining the OSNR are the input optical power of single wavelength and system level. The lower the input power of the optical amplifier, the fast the OSNR decreases.

Non-linearity: The non-linearity is related to the incident optical power of signals, fiber type, link dispersion configuration and transmission level. The higher the incident optical power of signals, the stronger the linearity is. The fiber type, link dispersion configuration and transmission level are designated at the market design stage. Note that the dispersion module has a stringent requirement for non-linearity. The input optical power of the dispersion module should be less than -3 dBm.

Dispersion: Normally, the Marketing Department completes the optimal design according to the marketing design guide rules at the system design stage. Note whether the dispersion configuration on site is the same as that in the design. Generally, if other factors are normal but multiple wavelengths are abnormally running, the configuration correctness of the DCM module needs to be checked.


Content


and Method System Limitations

Optical amplifier unit


Other units


Commission Requirement and Method for Optical Amplifier Unit

1. Commissioning Requirement for Optical Amplifier Unit Optical power

Adjust the average optical power level of input and output wavelengths to or close to the one-channel standard input and output optical power.

Adjust the number of wavelengths that are greater than the average one-channel optical power to be equal to the number of wavelengths that are smaller than the average one-channel optical power.

Adjust the flatness of each one-channel optical power, so that the OSNR of the receive end is flat and meets the design requirement. If the optical power flatness meets the index requirement, the optical power flatness can be sacrificed to guarantee the signal noise ratio.

Definition of one-channel standard optical power The one-channel standard optical power means that one channel should be adjusted to a

value that guarantees the optimum performance. This value is generated based on the OSNR and non-linear balance and is the maximum input and output one-channel optical power that an optical amplifier unit allows.

OSNR requires higher optical power. The higher the optical power, the better the OSNR. Excessive optical power can result in non-linear impact. The lower the input optical power,

the smaller the non-linear impact. The one-channel standard optical power can be calculated based on the maximum optical

power index.


1. Commissioning Requirement for Optical Amplifier Unit Calculation of one-channel standard optical power for optical amplifier unit

Suppose the one-channel standard optical power is S (mW), 10lgS (dBm). Suppose the maximum number of add or drop wavelengths is N for the optical amplifier

unit and the optical power of each wavelength is the same, then Total optical power 10lgNS=10lgS+10lgN ＝ maximum input and output optical power The one-channel standard input and output optical power 10lgS ＝ maximum input and

output optical power - 10lgN, where N is the number of input wavelengths when the optical amplifier unit supports full wavelengths.

For example, the input optical power range of an optical amplifier unit is -32 to -3 dBm and the maximum output optical power is 20 dBm

When the optical amplifier unit supports 40 wavelengths, the one-channel standard input optical power is -3 - 10lg40 ＝ -19dBm

When the optical amplifier unit supports 40 wavelengths, the one-channel standard output optical power is 20-10lg40 ＝ 4dBm

Question: is the number of wavelengths when the system supports full wavelengths equals to the number of wavelengths when the optical amplifier unit supports full wavelengths?

No. For some WDM systems, the number of wavelengths when the optical amplifier unit supports full wavelengths is not equal to the number of wavelengths when the system supports full wavelengths. For example, the C+L band 80-channel system and the C+L band 160-channel system.



Introduction to the SSE3OAU Board

There are several types of finished SSE3OAU board are available. The SSEOAU is classified into

different types according to different classification criteria:

Classification according to the OAU hardware version: In the case of LH WDM products, there are E2, E3

and E4 series, of which the E2 series for the C band is manufacture discontinued and replaced by the E3OAU

and the E2 series for the L band contains only the E2OAU01 currently. The E4 series can amplify the optical

signals of the normal C band and the extended C band at the same time. The C6 series used in the Metro

WDM products is developed based on the E3 series.

Classification according to the OAU type: The E3OAU is classified into five types: C00, C01, C02, C03,

andC05. The gain range and maximum/minimum input/output optical power vary with the type. For details on

the specifications, refer to the Hardware Description Optical Amplifier Boards.

Classification according to the suffix of the board name: There are six kinds of suffixes of the E3OAU

board name: A, B, C, D, E, and R. A indicates that the EDFA module uses low power pump board with the

EVOA; B indicates that the EDFA module uses low power pump board without the EVOA; C indicates that the

EDFA module uses high power pump board with the EVOA; D indicates that the EDFA module uses high

power pump board without the EVOA; There is only the E3OAUC03E board identified by the suffix E, which

has a wider gain range. The boards identified by the suffix R are added with the return loss detection function,

compared with the original boards. They are mainly used in the OptiX BWS 1600A products. The boards with

suffix A and suffix C are interchangeable; the boards with suffix B and suffix D are interchangeable; the

boards with suffix C and suffix D can replace the boards with suffix A and suffix B.

OAU hardware version

OAU type

Suffix of the board name

SSE3OAUC01CExample:


DCM

OAU board interface

Notes ：① During commissioning, the difference between the power queried from NM and tested by meters should less than ±1dB. The total power should include the noise. ②we have to pay attention to the DCM insertion loss between the port 5(TDC) and port 3(RDC) when we are setting the gain of the amplifier.

PA BA

TDC RDC MON

OUTINEDFA

PIN

VOA

Branch unit

1

5

2 43VOA

Some OAU don’t

have EVOA here,

need to add MVOA E2 series ports from left to right ：IN 、 OUT 、TDC 、 RDC

E3 series ports from left to right ：IN 、 TDC 、RDC 、 OUT


One-channel optical power

Total optical power Improved method of total optical power

Instrument Optical spectrum Analyzer

Optical power meter Optical power meter

Duration Long Short Short

Cost High Low Low

Correctness High Low Medium

Impact of earlier stage commissioning on later stage commissioning

Affected. If earlier stage commissioning is not correctly performed, re-commissioning should be performed on a per-station basis.

Affected. If earlier stage commissioning is not correctly performed, re-commissioning should be performed on a per-station basis.

Not affected. Re-commissioning is performed only for the stations where commissioning is not correctly performed.

Support for bidirectional commissioning on a per-station basis

Not supported Not supported Supported



Position of the mechanical VOA on the subrack

Clockwise rotation: Increase attenuation. Counterclockwise rotation: Decrease attenuation.

Part of the cabinet fiber connection diagram: Position of the VOA attached to the OAU at the receive end

Position of the VOA attached to the OAU at the transmit end


One-channel input optical power1) If the one-channel average input optical power before you add an attenuator is higher than the one-channel standard input optical power, adjust the variable optical attenuator (VOA) to enable the one-channel average input optical power to reach the standard. 2) If the one-channel average input optical power cannot reach the one-channel standard input optical power, remove the VOA at the input end of the amplifier. In this way, the one-channel average input optical power remains the maximum optical power.



One-channel output optical power

1) Do not adjust the output optical power for optical amplifier units except the OAU. The one-channel optical power that is output based on fixed gain is the standard optical power. For the E2OAU, set an EVOA to enable the one-channel output optical power to reach the standard.

2) If the E3OAU and the C6OAU has an EVOA, set gain ＝ one-channel standard output optical power － adjusted one-channel average input optical power

For the OAU that does not have an EVOA, adjust the VOA of TDC/RDC to enable the one-channel average output optical power to reach the standard.

Are there any requirements for the configuration of the gain ？



1.Commission Requirement and Method for Optical amplifier unit

Board name Gain range Maximum

gain

Maximum output

optical power

E3OAUC01A/B/

C/D

C6OAUC01A/B

20~31dB 31dB 20dBm

E3OAUC02A/B/

C/D

C6OAUC01A/B

20~31dB 31dB 17dBm

E3OAUC03A/B/

C/D

C6OAUC03A/B

26~32dB 38dB 20dBm

E3OAUC03E 24~36dB 36dB 20dBm

E3OAUC05 23~34dB 34dB 23dBm


1. Check the board type and the adjustable range of the OAU

gain.

2. Check the middle insertion loss of the DCM between the TDC

and the RDC.

3. According to the middle insertion loss, calculate the range of

configurable gain of this OAU.

4. Confirm the single-wave average input power Pin.

5. Calculate the gain value.

6. Check whether the gain exceeds the range.

7. Set the gain.

Procedure for Using OAUs of E3/C6 Series upon Deployment (General)


Using OAUs of E3/C6 Series-Step 1

1. Check the board type and the adjustable

range of the OAU gain. 1. Check the front panel, or confirm that the OAU is of E3

series according the software version. Software version of

E3/C6 is 3.XX.

2. Check the adjustable range of the gain.

Use this command line: cfg-get-gainrange

Search the specification in the product manual.


2. Check the middle insertion loss of the DCM between the TDC and the RDC.

Well connect the board. Connect a DCM between the TDC and the RDC. Port IN inputs light after power-on. According to the reported performance events, confirm the DCM

insertion loss. Command for performance report: per-get-curdata. Definition of the OAU optical power is shown in the

following figure. DCM insertion loss = output optical power of No.5 interface - input optical power of No.3 interface




3. According to the middle insertion loss, calculate the

range of configurable gain of this OAU.

Maximum configurable gain = Maximum gain – DCM insertion loss

OAU01:31 OAU02:31 OAU03A/B/C/D:38 OAU03E:36 OAU05:34

The minimum of configurable gain value: minimum gain

For example:

For an OAU01 board, connected to a DCM whose insertion loss is 6 dB.

The maximum of configurable gain = 31 – 6=25dB

Gain range: 20– 25dB



4. Confirm the single-wave average input power Pin.

As the requirement of commissioning, we should adjust the

single-wave power to the standard value. (If it can’t reach the

standard value, please make it approach the standard value.)

1) An optical spectrum analyzer is recommended to test the optical power

of input signals. The average power of the single-wave power of all

wavelength signals : Pin

2) With no optical spectrum analyzer, use the following method to get the

Pin:

Total power method or Improved total power method as the

followed introduced.



5. Calculate the gain value

Stdgain value = Single-wave Standard output power – Pin

For an OAU with 20dBm maximum output, such as OAU01 and OAU03,

when it is applied in a 40-channel system, the single-wave Standard

output power is +4dBm; when it is applied in a 80-channel system, the

single-wave output optical power is +1dBm.

An OAU2 with 17dBm maximum output is only applied in 40-channel

systems and the output power is +1dBm.

Single-wave output power of an OAU5 with 23dBm maximum output is

+7dBm/+4dBm.



6. Check whether the gain exceeds the range. The calculated value of Stdgain should be in the range of the

calculated gain in step 3.

1. If the stdgain is lower than the minimum gain

Cause: The optical power input to OAU is to high and causes excessively low gain. Example: In a 40-channel system, the single-wave optical power input to the OAU01

is –15dBm, then the Stdgain = 4 – (– 15) = 19dB while the minimum gain of the

OAU01 is 20dB.

Handling procedure: Increase the attenuation of the attenuator before the OAU to

decrease the single-wave average optical power.

For example, if you increase the attenuation for 3dB, the input single-wave average

optical power is – 18dBm.

Stdgain = 4 – (– 18) = 22dB, which is acceptable.


2. The Stdgain value calculated exceeds the gain range obtained in step 3.

Cause: The input per-channel optical power is excessively low, the DCM insertion loss is excessively high, or an

improper OAU is used.

For example: In the 40-channel system, if the OAU01 board is used and the DCM insertion loss is 6 dB, the gain

range must be 20–25 dB. If the input per-channel optical power is –22 dBm, the Stdgain = 4 – (–22) = 26 dB,

which exceeds the range.

Possible cause:

(1) The attenuation of the VOA attached to the OAU is excessively high. Decrease the attenuation of the VOA to

increase the per-channel optical power. (If step4 is properly performed, this problem will not occur)

(2) If the attenuation of the OAU attached to the OAU cannot be further decreased, it indicates that the DCM

insertion loss is excessively high, or an improper OAU board is used for long hop transmission. As long hop

has been taken into account during the project design period, the possibility of the latter is small.

Solution:

(1) Adjust the VOA attached to the IN port on the OAU to ensure that the per-channel input optical power is

consistent with the standard per-channel input optical power. (2) If the DCM insertion loss is excessively high or

an improper OAU is used, adjust the position of the DCM, for example remove the DCM from the OAU, to

eliminate the extra attenuation caused by the DCM, or replace the OAU by a proper OAU board or by a

combination of the OA boards. For the configuration rule of the OAU, refer to the OptiX

BWS 1600G Network Design Guide and the OptiX Metro 6100 Network Design Guide . During the commissioning,

if it is found that the marketing design cannot meet the system requirements, fill in the Contract Problem

Feedback Sheet.

Use Steps of the E3/C6 Series OAU –STEP 6


Using OAUs of E3/C6 Series-Step 7 7. Set the gain

Use the command: cfg-set-stdgain. If it fails, the configured gain might

exceed the gain range. Recheck whether the calculated gain is in the gain

range calculated in step 3.

Settings on the NMS: Directly set in the Moninal Gain.

Real gainSetting gain

The gain of the C-band wavelength channels oriented the E3OAU and E4OAU can be adjusted within ±2.5 dB of the gain boundary. It is used in the ALC function but not allowed to be used in commissioning.


Using OAUs of E3/C6 Series-Step 8 8. Query the actual gain After you set the gain, query

whether it is successfully issued.

Use command line: cfg-get-gain On the NMS: Criterion: The command succeeds if the

queried actual gain “Gain” is within the range of the issued stdgain±0.5dB.

If the command fails, recheck whether the Stdgain exceeds the gain range.


Flatness Requirement in Commissioning One-Channel Optical Power

Flatness requirement of one-channel optical power Adjust the optical power of each wavelength to fall inside the range (-2 dB to 2 dB) of

average one-channel optical power. Under special conditions (RAMAN/ROP/ULH has worse OSNR), the index requirement also apply.

If the optical power flatness meet the index requirement, the optical power flatness can be sacrificed to guarantee the flatness of OSNR (or BER).

Method of adjusting one-channel optical power flatness “adjust the transmit end based on the receive end”―monitor the receive end and

adjust the transmit end to ensure optical power flatness at the receive end. The purpose of adjusting the optical power flatness of each wavelength is to ensure

that the OSNR of the receive end is flat and meets the design requirement. If the designed OSNR is not met, the OSNR and flatness need to be further adjusted.

Before an optical amplifier unit is adjusted, ensure that the attenuator of each wavelength has enough tunable range. Set the initial value according to tunable range.

Notes 1. Currently, you can adjust the optical power flatness of each wavelength only when

each wavelength has a tunable attenuator. If not in the case, you can only check, but cannot adjust the flatness of transmitted optical power.

2. After you adjust the one-channel average optical power of an optical amplifier unit, consider to adjust the optical power flatness of each wavelength at the receive end.



Method of Commissioning One-Channel Optical Power Sample E3OAU commissioning

The input optical power of the E3OAUC03E ranges from － 32 dBm to － 4 dBm, the gain ranges from 24 to 36, and the maximum output optical power is 20 dBm. The E3OAU is used in the OptiX 1600G III model system. If the tested one-channel average input optical power before you add a VOA is － 15 dBm, how do you commission the system? If the value is － 25 dBm, how do you commission the system?

PA BA

TDC RDC MON

OUTINEDFA

PIN

VOA

splitter

1

5

2 43VOA

Note: Some OAUs do

not have an EVOA. You

need to add an MVOA

externally.



Method of Commissioning One-Channel Optical Power

Sample E3OAU commissioning The OptiX 1600G III model system is a 40x10G system. The calculated one-

channel standard input optical power is － 20 dBm and the output optical

power is +4 dBm.

If the one-channel average input optical power before you add a VOA is － 15 dBm,

adjust the VOA to enable the one-channel average input optical power to reach

the standard. In this case, the one-channel average input optical power ＝－ 20

dBm, the gain is ＝ 4 － ( － 20) ＝ 24dB.

If the one-channel average input optical power before you add a VOA is － 25 dBm,

remove the VOA to enable the one-channel average input optical power to

reach the largest value. In this case, the one-channel average input optical

power ＝－ 25 dBm, the gain is ＝ 4 － ( － 25) ＝ 29dB.

Method of commissioning an OAU without EVOA

adjust the VOA to enable the one-channel average input optical power to reach

the standard. Adjust the MVOA to enable the one-channel average output

optical power to reach the standard (+4 dBm).



Method of Commissioning One-Channel Optical Power Sample E3OBU commissioning

The input optical power of the E3OBUC03 ranges from － 24 dBm to － 3 dBm, the gain is 23 dB, and the maximum output optical power is 20 dBm. The E3OBU is used in the 1600G III model system. If the tested one-channel average input optical power before you add a VOA is － 14dBm, how do you commission the system?

The OptiX 1600G III model system is a 40x10G system. The calculated one-channel standard input optical power － 19 dBm and +4 dBm.

Adjust the VOA to enable the one-channel average input optical power to reach the standard. In this case, the one-channel average input optical power ＝－ 19dBm, and the tested one-channel average output optical power is +4 dBm.

INBA OUT

21OBU diagram

VOA



Method of Commissioning Total Optical Power Total input optical power

If the total input optical power before you add a VOA is higher than the total standard optical power, adjust the VOA to enable the total input optical power to reach the standard. In this case, the one-channel average input optical power ＝ one-channel standard input optical power.

If the total input optical power cannot reach the total standard input optical power, remove the VOA at the input end of the amplifier, to enable

the total input optical power to remain the maximum optical power. Total output optical power

Do not adjust the output optical power for optical amplifier units except the OAU. The optical power that is output based on fixed gain is the standard optical power.

For the E2OAU, adjust the EVOA to enable the total output optical power to reach the standard.

If the E3OAU and C6OAU has an EVOA, set the gain to enable the total output optical power reach the standard.

For the OAU that does not have an EVOA, adjust the VOA of TDC/RDC to enable the total output optical power to reach the standard.



Commission Requirement and Method for Optical Amplifier Unit Definition of total optical power

Total optical power refers to the total optical power of the obtained standard per-channel optical

power after commissioning the board.

The total standard optical power satisfies the following formula:

Total standard optical power = Standard per-channel optical power + 10lgn + offset.

The definition of the standard per-channel optical power is the same as the definition

provided previously;

n refers to the number of signal wavelengths accessed by the OAU contain;

offset refers to the power offset that is added to compensate for the optical power during

power commissioning performed by using the optical power meter to reduce the noise

impact. The offset value varies indirectly with the number of wavelengths and OSNR.

The theoretical OSNR value can be obtained by using the OptiX BWS 1600G OSNR calculation

tool.

Offset calculation tool


Method of Commissioning Total Optical Power

Theoretical calculation of total optical power Noise optical power = 10lgN1 = 10lg (40 x 8 x N) = 10lgS (output/input

average one-channel optical power of the optical amplifier unit) － 10lgS/N

(local OSNR) + 10 x lg8 + 10 x lg40. N1 is the total noise optical power, N

is 0.1 nm noise optical power. OSNR defines the noise as 0.1 nm.

Signal optical power = 10LgS1 = 10lgnS = 10lgS (output/input average

one-channel optical power of the optical amplifier unit) + 10lgn. n is the

current number of wavelengths, S1 is the total signal optical power, and S

is the one-channel signal optical power.

Total optical power = 10lg (S1 + N1)

offset = 10lg (S1+N1) － 10lgS1 = 10lg (1 + N1/S1), N1=40 x 8 x N, S1=nS

offset ＝ 10lg (1 + (40 x 8/n) x N/S)

Note: This method can be used to verify the total optical power that is

calculated by using the previous method.



Method of Commissioning Total Optical Power

Sample offset computation For example, the one-channel standard output optical power of an optical

amplifier unit is adjusted to +4 dBm. The OSNR is 22 dB. Totally there are two

wavelengths. What is the total standard output optical power that should be

commissioned? OSNR = 10lgS/N = 22 dB

N/S = 0.0063

offset = 10lg (1 +(40 x 8/n) x N/S) = 10lg (1 + (40 x 8/2) x 0.0063) = 3 dB

offset is irrelevant to the input and output optical power, but is relevant to

OSNR, amplification range of an optical amplifier unit (for example, 320 nm,

1529 nm-1561 nm, 40 channel x 0.8 nm) and the number of current add/drop

wavelengths.

The wavelength range is a fixed parameter for the optical amplifier unit. The

higher OSNR, the less offset. The more wavelengths, the less offset.

For 10 channels, offset = 10lg (1+(40 x 8/n) x N/S) = 10lg (1+ (40 x 8/10) x

0.0063) = 0.8 dB



Method of Commissioning Total Optical Power Sample E3OAU commissioning

The input optical power of the E3OAUC03E ranges from － 32 to － 4 dBm. The gain ranges from 24 to 36. The maximum output optical power is 20 dBm. The E3OAUC03E is used in the OptiX 1600G III model system and has four wavelengths totally. If the tested total input optical power before you add a VOA is － 9 dBm, how do you commission the system? If the value is － 20 dBm, how do you commission the system?

PA BA

TDC RDC MON

OUTINEDFA

PIN

VOA

splitter

1

5

2 43VOA

Note: Some OAUs do

not have an EVOA.




Example: Commissioning the E3OAU board

The OptiX BWS 1600G III system is a 40 x 10G system. In the system, the OSNR before being

input to the OAU at the receive end is about 25 dB, and there are four channels in total. The

calculated standard per-channel input optical power and output optical power are –20dBm and

＋ 4dBm, respectively. Use the offset calculation tool to calculate the input offset and the

calculated value is about 1 dB. Then, calculate the standard total input optical power and the

calculated value is –13 dBm.

If the total input optical power is –9 dBm before attaching the VOA to the OAU: Adjust the VOA to ensure that the input optical power reaches the standard level, i.e. –13 dBm;

–20 (standard per-channel input optical power) = –13 – 10lg4 – 1;

Set value = 4 – (–20) = 24 dB (make sure that it is within the gain range);

Query the total output optical power and it is approximately 11.2 dBm.

Theoretical calculated value: 11.2 dBm ＝ 4 + 10lg4 + 1.2 (offset), which is consistent with the queried

value. The Offset in the formula is related to the output OSNR, which is about 24.02 dB as obtained

through calculation performed by using the OSNR calculation tool. Thus, the output offset is about 1.2 dB.



If the total input optical power is –20 dBm before attaching the VOA to the OAU: Remove the VOA to ensure that the input optical power reaches the maximum value,

i.e. –20 dBm. –27 (input per-channel optical power) = –20 – 10lg4 – 1; Set value = 4 – (–27) = 31 dB (make sure that it is within the gain range); Query the total output optical power and it is approximately 11.64 dBm. Theoretical calculated value: 11.64 dBm ＝ 4 + 10lg4 + 1.64 (offset), which is

consistent with the queried value. The Offset in the formula is related to the output OSNR, which is about 22.4 dB as obtained through the calculation performed by using the OSNR calculation tool. Thus, the output offset is about 1.64 dB.

Precautions: If the offset (OSNR) value is improperly set, commissioning result may be inaccurate.

In the case of the pass-through wavelengths, when the OSNR of each wavelength is

different, use the minimum OSNR.


Improved Commissioning Method for Total Optical Power

Determine the input optical power and the OAU gain according to the requirements of the OAUs in

the downstream and upstream stations and the queried optical power value.

Standard total optical power at point 3 = Queried total optical power at point 2 – (Standard per-

channel optical power at point 2 – Standard per-channel optical power at point 3)

OAU gain of station B = (Standard per-channel optical power at point 4 – Standard per-channel

optical power at point 2) + (Queried total optical power at point 2 – Queried total optical power at

point 3)

Line attenuation value as designed

Actual total optical power at the transmit end

Actual line attenuation value

OA OA

– Loss =

Total Pout Total Pin

Standard per-channel Pout Actual per-channel Pin

Station A (upstream) Station B (downstream)

21 3 4Improved

commissioining method


Improved Commissioning Method of Total Optical Power Sample E3OAU commissioning as what is described in the previous page

Query or test that the total output optical power in the upstream direction is 11 dBm.

You should adjust the total standard input optical power = 11 － (4 －( － 20)) = － 13 dBm

If the total input optical power before you add a VOA is － 9 dBm, you can adjust the VOA to enable the total input optical power to

reach the standard. The total input optical power is － 13 dBm. the adjusted one-channel input optical power of the optical amplifier

unit in the downstream direction = 4 － (11 － ( － 13)) = － 20 dBm you can set gain = 4 － ( － 20) = 24 dB you can use the total output optical power as a reference to adjust the

optical power of the optical amplifier unit in the downstream direction.



Improved Commissioning Method of Total Optical Power If the total input optical power before you add a VOA is － 20 dBm,

you can remove the VOA. The total input optical power = － 20 dBm the adjusted one-channel input optical power of the optical amplifier

unit in the downstream direction = 4 － (11 － ( － 20)) = － 27 dBm you can set gain = 4 － ( － 27) = 31 dB. You can use the total

output optical power as a reference to adjust the optical power of the optical amplifier unit in the downstream direction.

Difference with the previous commissioning method of total optical power

The way of obtaining the standard total optical power is different. The method of calculating the one-channel optical power is

different.



OAU05/OBU05/HBA Commissioning Compared OAU05/OBU05 with OAU03/OBU03, the maximum

transmitting optical power is 23 dBm. In the 40-wavelength system, the standard output single-wavelength optical power is + 7 dBm. Commissioning for other values is the same.

The maximum output optical power of HBA can reach 26 dBm. For the 40-wavelength system, the single-wavelength output optical power is + 10 dBm. Considering high optical power with full wavelengths configuration, the optical power from HBA to FIU is the APC. The optical power on the local HBA (0–20km) is higher, so ensure the quality of transmission fiber. A common fiber connector may burn the fiber surface, thus bringing on bad influences for the system security. The fiber splice mode is preferred between the HBA and local Raman amplifier (within 20km) and fiber connector is avoided.

When fiber connector is mandatory, the fiber jumper and connector should be processed specially; namely, use APC jumper and flange.


Commissioning Requirement on Optical Power of Raman

Amplifier

Requirements The switch gain of a Raman amplifier ≥ 10 dB

The gain flatness of each channel should fall inside the 3 dB range.

RPC has two pump and RPA has three pump. Amplification is the result of the

functioning of all pump.

When the gain is guaranteed, set the pump optical power to a lower value for

security. The working current cannot exceeds the threshold. Before you turn on a pump laser, you need to enable IPA for the purpose of security.

The T2000 disables IPA. You must enable IPA to turn on the pump laser.

Fiber Type(by standard)

P1(power of pump group

1)

P2(power of pump group 2)

G.652/ G.655 24.0 dBm 24.0 dBm

G.653 23.0 dBm 22.5 dBm



6. Commissioning Requirement and Method on Optical Power of Raman Amplifier Method of commissioning optical power of Raman amplifier – gain

1. After you connect fibers, when you have not turned on a pump laser, use the optical spectrum analyzer to monitor the MON port on a Raman amplifier and test the optical power of a one-channel signal.

2. Set the pump optical power to a recommended value. You need to set it for two pump groups.

3. Turn on the two groups of pump lasers and read the optical power of the one-channel signal by using the optical spectrum analyzer.

4. Compare the optical power of the one-channel signal when the pump laser is on and that when the pump laser is off, and calculate the switch gain.

5. If the switch gain is less than 10 dB, you can moderately increase the two groups of output pump optical power by 0.1 dB at a time, until the minimum channel switch gain is large than 10 dB.

Note: As you must enable IPA by using the T2000, a direct test on SYS enables IPA and shuts down the Raman pump. As a result, you cannot commission the optical power of the Raman amplifier.

Notes: The working current threshold crossing alarm indicates that you set a high value for the

pump optical power and need to set it to a lower value. The pump optical power that you set cannot generate this alarm. If this alarm is generated and the gain cannot reach the value of 10 dB, you need to shut down the laser and check or replace fibers.



6. Commissioning Requirement and Method on Optical Power of Raman Amplifier

Method of commissioning optical power of Raman amplifier – gain flatness 1. After you adjust the switch gain to meet the value of 10 dB, compare the gain flatness of each

channel and check whether they fall inside the range of 3 dB. If so, usually you need not adjust the gain flatness.

2. If the gain flatness of each channel exceeds 3 dB, or wavelengths concentrate on a wavelength, and you cannot correctly verify whether the gain spectrum is flat, you need to use ASE spectrum to verify it.

3. After you stop the signals at the transmit end, keep the same pump settings, and turn on the pump laser. Use the optical spectrum analyzer to test the SYS port. The test result is the ASE spectrum.

4. Compare the two wave peaks of 1535 nm and 1560 nm wavelengths in ASE spectrum. See if the optical power of the wave peak of the 1535 nm wavelength is approximately 1.2 dB (0.7 dB to 1.7 dB ) higher than that of the 1560 nm wavelength. If the compared value falls inside this range, you need not adjust the gain flatness.

Note 1: Generally, you need not adjust the gain flatness. This method of adjusting gain flatness cannot be performed by using the T2000 because stopping signals at the transmit end turns off the pump of the Raman board.

Note 2: For the purpose of security, you must use the T2000 to enable IPA before you can turn on the laser. Hence, when you turn on the laser, you must set the IPA auxiliary detection of Raman, to ensure that IPA does not shut down the laser during testing.



6. Commissioning Requirement and Method on Optical Power of Raman Amplifier

Method of commissioning optical power of Raman amplifier – gain flatness

1529. 58nm处归零

- 2. 5

- 2

- 1. 5

- 1

- 0. 5

0

0. 5

1

1525 1530 1535 1540 1545 1550 1555 1560 1565

增益谱形ASE谱形

△ 1

△ 2

△ 2 △ 1 0. 7dB－＝

Zero at 1529.58nm

Gain spectrumASE spectrum



6. Commissioning Requirement and Method on Optical Power

of Raman Amplifier

Method of commissioning optical power of Raman – gain flatness 5. If the optical power of the wave peak of the 1535 nm wavelength is 1.7 dB

higher than that of the 1560 nm wavelength, decrease the pump optical power of pump laser group 1 by 0.1 dB and increase the pump optical power of pump laser group 2 by 0.1 dB, until the optical power difference meets the requirement.

6. If the optical power of the wave peak of the 1535 nm wavelength is less than 0.7 dB higher than that of the 1560 nm wavelength, increase the pump optical power of pump laser group 1 by 0.1 dB and decrease the pump optical power of pump laser group 2 by 0.1 dB, until the optical power difference meets the requirement.

7. After you adjust the gain flatness, you need to re-test the switch gain. If the switch gain of all channels cannot be large than 10 dB, you need to re-adjust the switch gain in the way as described previously.

Note: Adjusting the pump optical power of pump laser group 1 changes the optical power of the 1535 nm wavelength. Adjusting the pump optical power of pump laser group 2 changes the optical power of the 1560 nm wavelength.



6. Commissioning Requirement on Optical Power of Raman Amplifier

Raman line requirements The Raman amplifier has a high requirement on the near-end line fiber loss. There

should be no connector in the circumference of 0 km to 20 km except at one end of the ODF. The two ends of fibers at all connection points must be fusion spliced.

Before you use a Raman amplifier, you must use OTDR to test the fibers on the line. It is recommended that the additional loss of the single-point loss event of fibers and cables in the line should meet the following criteria: the single-point additional loss is less than 0.1 dB (G652) or 0.2 dB (G655) in the circumference of 0 km to 10 km; the single-point additional loss is less than 0.2 dB (G652) or 0.4 dB (G655) in the circumference of 10 km to 20 km; the single-point additional loss is less than 0.4 dB in the circumference of 20 km to 30 km; the single-point additional loss is less than 1 dB in the circumference of 30 km to 40 km; the single-point additional loss is less than 2 dB in the circumference of more than 40 km. In addition, the single-point return loss cannot be less than 40 dB.

The fiber connector must be clean. If a spot appears on the fiber connector, the connector may easily be blown out.

The bending radius of a fiber jumper should be more than 4 cm. A large bending radius can blow out the fiber jump.



6. Commissioning Requirement on Optical Power of Raman Amplifier

Commissioning precautions The negative output optical power of a Raman amplifier can be 27 dBm.

When you insert and remove a fiber end, ensure that the laser is off as the laser exposure can cause permanent eye damage.

Currently, Raman amplifiers use backward pump structure. Strong pump lights are accessed to fibers through the input end (line) instead of the output end (SYS).

For the purpose of security, you must set IPA by using the latest version of the T2000 before you can turn on the Raman pump lights.

Do not add non-fiber equipment and units, such as an attenuator and fiber jumper, at the input end of SSE1RPA/C.

Use the special APC fiber connector. If you use the PC fiber connector, great reflection can blow out the fiber connector.



7. Commissioning Requirement on Optical Power In the Event of No

Amplifier (e.g. CWDM)

Commissioning Requirement on Optical Power In the Event of No

Amplification (e.g. CWDM)

You need not commission the optical power in the line for the wavelengths

that do not pass the amplifier, and need not ensure the optical power

flatness of each wavelength in the line. If an amplifier is not installed at the local transmit end but one is installed

at the opposite receive end, you need to adjust the flatness of launched

optical power of each wavelength to a high value as much as possible. If an amplifier is not installed at the local receive end, you need not use a

VOA to adjust the optical power of the dropped wavelengths in the line. CWDM has no amplifier as CWDM has wide wavelength frequency that

results in a high cost to install an amplifier.



Questions Questions

1. The maximum output optical power of an amplifier is 23 dBm. For a 40-channel system, what is the one-channel standard output optical power?

2. What are the main operations for commissioning an amplifier? 3. In the methods of commissioning one-channel optical power, is

the one-channel optical power method refers to the method of testing the optical power of an optical amplifier unit by using the optical power meter in the case of one channel? Is the method refers to the method of querying the optical power of an optical amplifier unit in the case of one channel?

4. Set gain = actual gain of the optical amplifier unit = output optical power of the optical amplifier unit － input optical power of the optical amplifier unit. Is it correct? Set gain = average actual gain of the optical power of current one-channel signal = average one-channel output optical power － average one-channel input optical power. Is it correct?


Summary

In this chapter, we have learned:

The commission requirement of OA

Three commission methods for OA

Example for OA Commission


Contents


and Method Optical amplifier unit


Other units


1. Commissioning Requirement for OTU Basic commissioning requirements

The input optical power of the OTU must meet the requirement of “receiver sensitivity+3 to overload point － 5”.

The received optical power of the OTU should be in the level of the middle value between the overload point and the sensitivity.

Multiple types of OTU boards should be normalized whenever possible for easy management.

The bit error rate before error correction of an OTU should be less than -7. The value that is less than -11 is better.

Method Test the received optical power of the OTU, and add, change or remove a

fixed optical attenuator according to the requirements on the optical power. Notes

During commissioning, it is forbidden that the optical power that exceeds the overload point is accessed into the receive interface on the OTU. Otherwise, the optical module may be blown out. Exercise caution when you use the OTDR.

When you use the OTDR, you should disconnect the fiber on the opposite ODF. Though the optical power that the OTDR tests is small, the optical power of a pulse signal can transiently be up to 20 dBm. If the optical power that exceeds the overload point is accessed into the local equipment by mistake or the fiber on the opposite ODF is not disconnected, the optical module is easily blown out.

Commission Requirement and Method for OTU


1. Commissioning Requirement for OTU Commissioning requirements on special OTU

The boards (the last letter of a board name is s) that support Super WDM and the same type of boards that do not support Super WDM have inconsistent transmitted waveform due to inconsistent transmitting modules and coding methods. The boards that support Super WDM has a better OSNR tolerance and can be interconnected with the same type of boards that do not support Super WDM. The way of commissioning the optical power for the boards that support Super WDM is the same as the way of commissioning the optical power of other OTU boards. When you use an optical spectrum analyzer to test the optical power, use the special instrument, such as Aglint86145B. The signal peak bandwidth that you need to set is 0.5 nm and the noise RES bandwidth is 0.1 nm.

The way of commissioning the optical power for the OTU boards with FEC/AFEC is the same as the way of commissioning the optical power for the OTU boards without FEC. Be aware that the OTU boards without FEC cannot be interconnected with the OTU boards with FEC/AFEC. The designed OSNR tolerance for the OTU boards without FEC and that for the OTU boards with FEC/AFEC are better.



1. Commissioning Requirement for OTU Commissioning requirements on special OTU

There is no difference in the commissioning requirements and methods for 10G OTU and 2.5G OTU boards. But, the dispersion tolerance that you configure for 10G OTU boards is smaller than that you configure for 2.5G OTU boards. Hence, you need to add DCM for dispersion compensation.

The way of commissioning the optical power for the OTU boards that support GE services is the same as the way of commissioning the optical power for the OTU boards that support SDH services. You need to use smartbits to test bit errors. In addition, set the same auto-negotiation mode for both ends.

The way of commissioning the optical power for the OTU board at the 50 GHz spacing is the same as the way of commissioning the optical power for the OTU board at the 100 GHz spacing. The 50G CRZ signal cannot be directly tested by using the optical spectrum analyzer. Only the integral test method can be used.

The way of commissioning the optical power for the OTU boards with the optical tunable transponder is the same as the way of commissioning the optical power for other OTU boards. You can use the T2000 to set wavelengths.




OTU

2.5GPIN:7dB

7CLIENT

OTU

10GPIN:7dB

7CLIENT

OTU

2.5GAPD:15dB

15CLIENT

OTU

10GAPD:10dB

10CLIENT

OTU

Multi-mode:

CLIENT

RX OUTSingle-mode:

M40&MB2/MR2

M40&MB2/MR2

M40&MB2/MR2

M40&MB2/MR2

M40&MB2/MR2

The configuration rules of the optical attenuators on the client-side optical interfaces on the OTU refer to the notes of this slide.



IN TX

D

4

0

OTUAPD:15dB15 CLIENT

OTUPIN:7dB

CLIENT

OTUAPD:15dB

15

OTUPIN:7dB

OTU

OTU

RX OUT

IN OUT

M

4

0OAU

7

7

2

2

As for WDM side in 1600G OTM, the configuration rules of the optical attenuators are as follows:An Optical Amplifier Unit is required for pass-through wavelengths added currently or in the future. Fixed attenuators are not needed between OA and D40, while they are required on receiving port of OTU at WDM side: 15 dB is added for APD and 7 dB is for PIN..As for WDM side in 6100 OTM, a tunable attenuator is needed on each pass-through wavelength as well as on added wavelength.


Commissioning Requirements for Special OTUs

FEC, AFEC

The commissioning requirements for the OTUs with FEC/AFEC and the OTUs without the FEC are similar. Note that the OTUs without FEC, the OTUs with FEC, and the OTUs with AFEC cannot be connected to each other. Of the three types of OTU board, the OTUs with AFEC have better OSNR tolerance than the OTUs with FEC; the OTUs with FEC, however, have better OSNR tolerance than the OTUs without FEC. For details, refer to the Special Topic on OptiX

WDM Products FEC Function .

Configuration of tunable wavelengths

The wavelength tunable OTUs are commissioned in the same way as the other OTUs. However, wavelengths of the

wavelength tunable OTUs can be configured on the NMS.

Super WDM boards

Comparison of the Super WDM boards (the board name of every Super WDM board contains an "s") and the boards of the same type but without the Super WDM function: They have different transmit modules, and the coding of the boards are different. Thus, the wave forms that the boards transmitted are different. The Super WDM boards have better OSNR tolerance and can be connected to the boards without the Super WDM function. Note that the dispersion tolerance requirements is different when you use the Super WDM boards to replace the boards without the Super WDM function. When detecting the optical power and OSNR, there are special requirements for the optical spectrum analyzer, which

must provide the functions to set the signal bandwidth and noise equivalent bandwidth. For details, refer to the Guide to Testing the DRZ_CRZ Signal OSNR for Super DWDM System

The 10G OTUs and 2.5G OTUs share the same commissioning requirements. However, the 10G OTUs have lower

dispersion tolerance than the 2.5G OTUs. Thus, during configuration, the DCM modules must be used for the 10G OTUs

for dispersion compensation.

Dispersion tolerance

GE service boards

The OTUs for GE services and the OTUs for SDH services are similar in power commissioning. However, you need

to use the smartbits test equipment to test the BER of the OTUs for GE services. In addition, the working mode of the local

10G OTU must be consistent with the working mode of the opposite OTU. For example, if the local OTU works under the

auto negotiation mode, the opposite OTU also must work under the auto negotiation mode.

Multi-service integrated boards

When configuring the LWX, LWM, LQM, and LBF multi-service integrated boards, you need to set the service rate

and type of every port according to the relevant engineering design.


Precautions for Configuring Special OTUs • When configuring the LWX, LWM, LQM, and LBF multi-service integrated boards, you need to set the service rate and type of every port according to the engineering design as shown in the following two figures:

• When configuring a wavelength tunable OTU, you need to set the wavelength according to the engineering design, as shown in the following figure:

In addition, the working mode of the GE boards must be set to auto negotiation, and the WXCP boards (the ETMX and LOG) must be configured with intra-board cross-connections. For details, refer to the corresponding deployment guides.

Service rate setting Service type setting

Wavelength setting


Contents


and Method Optical amplifier unit


Other units


Commission Requirement and Method for Other Boards

1. Optical Supervisory Channel processing board

(SC1/SC2/TC1/TC2)

Commission requirements

To meet the requirement of processing the supervisory information, you need to set

the local clock of the SCC on an NE as the clock source of the entire network. The

communication between the OSC/OTC and the SCC of other NEs must be synchronous

with the clock.

The received optical power should not be close to the over loading point. The OSC

processing board inside the site should be connected with 15dBm attenuation.

Orderwire settings

Orderwire settings, conference call ring releasing, express orderwire

Output Optical

Power

Output Optical

Central Wavelength

Receiver

Sensitivity

Overloaded

Optical Power

-7–0dBm 1500nm–1520nm -48dBm -3dBm


Commission Requirement and Method for Other Boards2. OMU/ODU, optical component

Commission requirement These boards do not have special requirements for the received optical power. But

in case of any problems, other boards such as optical amplifier board, are affected.

Check each channel to find the incorrectly connected fiber jumpers, and check

whether the lines on the optical channels and whether the insertion loss and

attenuations of the optical components are normal.

Board & Port Insertion Loss Board & Port Insertion Loss

MR2: IN － DROP <2.5dB MB2 : IN － DROP <3dB

MR2: ADD － OUT <2.5dB MB2 : ADD － OUT <3dB

MR2: IN － MO <3dB MB2 : IN-MRO ， MRI-OUT

<2dB

MR2: MI － OUT <3dB MB2 : IN-BMO ， BMI-OUT

<1dB

FIU: IN － TM <1.5dB M40 <10dB

FIU: IN － TC <1.5dB D40 <10dB

FIU: RM － OUT <1.5dB Fiber connector <0.5dB/piece

FIU: RC － OUT <1.5dB ITL <3dB


3. Line board

Commission method

The fiber connection from FIU-OUT to ODF, and the one from

downstream ODF to FIU-IN are connected by installers who

are responsible for the quality of the connection.

The optical power from FIU-RC through FIU-TC should be

smaller than the planned attenuation. If the value exceeds

the planned attenuation, you need to use the optical power

tester to test the following section by section: FIU insertion

loss, fiber-routing attenuation, connected ring flange

attenuation, and cable attenuation.

For a fiber/cable problem, request the customer to change

the fiber core or rectify it.




Notes: The planned attenuation is a reference value that allows for

specific margins, which is provided based on the information provided by

customers. Usually, the actual attenuation is smaller than the planned

attenuation. Only in this case, can the planned SNR be ensured. Hence,

you need to check the actual attenuation and the planned attenuation

during the commissioning.

FIU

FIU

A B

Ring flange of line-side ODF, in

between is a optical fiber/cable

OUT INRC TC


Questions

Questions

Question 1: How much optical power should be commissioned for

WDM-side 2.5G APD and 10G PIN?

Question 2: If the receive range of a board is 0 ~ -18 dBm, and

the at the received end of the interconnected SDH equipment,

the optical power is -2 dBm, how much dB should be the fixed

attenuator?

Question 3: Which part of the attenuation does the attenuation

planned by the market telecom refers to?


Summary

In this chapter ,we have learned:

Commission Requirement and Method for Optical amplifier unit, Optical Transponder Unit, and Other units


Contents



and Method


Check the Result of

Commissioning


Contents

System Commissioning System Commissioning process

OTM Commissioning

OLA Commissioning

OADM Commissioning

ROADM Commissioning

Special Function Commissioning


System Commissioning Procedure Before commissioning the system, you need to produce a commissioning plan, which must

contain the following information:

Station commissioning sequence

Arrange the station commissioning sequence according to the wavelength allocation diagram,

OAU configuration diagram, human resources, and equipment resources.

Arrangement of human resources of every station

Arrangement of serial connection test

Determine which station need be attached with a test meter for 24-hour testing, which services

need be connected serially for testing, on which station to perform a loopback test, and how to

perform a test on serial connections. After the commissioning , release the loopback configured

and restore the normal connections.

Station commissioning

Precautions for commissioning

When performing the commissioning, if the design need be modified, fill in the Contract

Problem Feedback Sheet.

During the commissioning, if there are damaged components, deal with the problem

according to engineering spare parts management system.


Station Commissioning Sequence －Wavelength Allocation Table

Service wavelength Station

name

Solid line Working service

Dotted line: Protection service

The solid circles indicate the stations where services are added/dropped

Station name+cabinet-subrack SN

Slot ID (3 as in this example)-board name-optical interface name

For details of the wavelength allocation table, refer to the lower left part of the table.


Station Commissioning Sequence – Network

Amplifier type

Transmission distance and loss

DCM type REG transmission distance and

designed OSNR


Commissioning procedure-sites

Follow the above figure, we can select two commissioning procedures.

Procedure 1: forward direction: A—B—C and reverse direction: C—B—A; forward direction: C—D—E—F—A and reverse direction: A—F—E—D—C.

Procedure 2: forward direction: A—B—C--C—D—E—F—A and reverse direction: A—F—E—D—C--C—B—A.

Forward direction means received in the west and transmitted in the east. Reverse direction is opposite. If many people debug at the same time, select procedure 1; if one person debugs, select procedure 2.

When we do the commissioning, There should be some cooperator in the upstream and downstream sites.


BER test arrangement Arrangement of BER test

Determine which station need be attached with a test meter for 24-hour testing,

which services need be connected serially for testing, on which station to

perform a loopback test, and how to perform a test on serial connections. After

the commissioning , release the loopback configured and restore the normal

connections.

Testing network-wide bit errors


Station Commissioning Sequence

The following tasks must be completed before you commission a station: Power-on

check, NE configurations (creation of NEs, setting of NE ID/IP, and ECC setting on the NMS),

and inspection of fiber connections and optical path connectivity between stations.

The commissioning covers the following aspects:

1. Synchronizing NE time and enabling NE performance monitoring

2. Commissioning the Supervisory Channels

3. Configuring orderwire

4. Configuring the attributes of the WDM-side ports

5. Querying the software versions, querying or setting alarm suppression information,

and backing up data

6. Commissioning the optical power of a station


Synchronizing NE time and enabling NE performance monitoring After proper settings, the NE time can be synchronized with the T2000 server

time automatically. In this way, the time of alarms and logs can be correctly recorded in the T2000.

Select Configuration > NE Time Synchronization from the Main Menu. Select the NEs in the left pane and click . Set the Synchronous Mode parameter to NM and click Apply. Click Close when the success prompt appears. Set the Synchronize Starting Time and Synchronization Period (days) parameters in the lower pane. Click

Apply. Click OK when a confirmation dialog box is displayed. Click Close in the Operation Result dialog box.

Setting the Performance Monitoring Time. After setting this item, T2000 can get the optical power management.

Choose Performance > NE Performance Monitor Time from the Main Menu. All NEs are selected by default on the T2000. Select NEs from the NE list. Click the double-right-arrow button (red). Select the desired NE in the Performance Monitor Time pane. In the Set 15-Minute Monitoring group box, click Enable. Set the starting time which must be later then the current NM and NE time as needed. Set the stopping time which must be later then the starting as needed. You can also choose not to set the stopping

time. In the Set 24-Hour Monitoring group box, click Enable. Set the starting time which must be later then the current NM and NE time as needed. Set the stopping time which must be later then the starting as needed. You can also choose not to set the stopping

time. Click Apply, and the Operation Result dialog box is displayed. Click Close.


Commissioning the Supervisory Channels － Power Commissioning

Supervisory channel commissioning involves optical supervisory channel (OSC) commissioning and

electrical supervisory channel (ESC) commissioning.

In the case of the OSC, the commissioning involves optical power commissioning and clock

commissioning.

The commissioning requirements for the OSC optical power are as follows:

The receive optical power of the supervisory signal processing board must be in the range from –45

dBm to –15 dBm after the commissioning.

A fixed optical attenuator of 15 dB must be used when the OSC channels of a station are connected

to each other.

Operation procedure:

Check whether the fibers of the OSC board are properly connected (for details, refer to the NE Commissioning of OptiX WDM Products).

Configure the wavelength range of the optical power meter:

– In the case of C band, set the wavelength to 1550 nm.

– In the case of L band, set the wavelength to 1625 nm.

On the power meter, measure the transmit and receive optical power of the OSC board. Record the

test result in the Optical Power Commissioning Record Table.


Commissioning the Supervisory Channels －Clock Commissioning

The commissioning requirements for the OSC clock are as follows:

On the entire network, the local clock of the SCC board at one station must function as the clock source, and the communication between the OSC/OTC boards and the SCC boards of other stations must be

synchronous to this clock. Otherwise, a slip code will occur on the OSC/OTC board of every NE.

If the network is a ring network, the clock configuration is as follows: Set the clock of the SCC at the master station to the local clock source. Regarding the clocks on the SCC boards at other stations: The first priority clock functions the clock of slot 6, and the second priority clock functions as the local clock. (the internal clock has the lowest priority and

cannot be configured) Regarding the clocks on the SC2/TC2 boards at other stations: The returned clock is the west clock (There are two types of clock can be returned: west clock and east clock, which correspond to optical interfaces 1

and 2 on the SC2/TC2, respectively. The west clock is returned by default. That is, the clock at optical interface 1. The SC1/TC1 board can return only the west clock.) For more clock-related information, refer to the

Creating a Network.

Priority adjustment

Right-click here to add/delete a clock source

The TC1/TC2 and ST1/ST2 can transparently transmit clock signals. For details, refer to Creating a Network

Internal clock source

Tracing the west clock



W W WE E


Commissioning the Supervisory Channels － ESC Commissioning

Follow the operations below to enable the ESC function: Right-click the NE icon.

Select “NE Explorer”

Select “WDM Interface” from the board function tree.

Select “ESC Assistant switch”

Set it to “Enabale”

Click “Apply”

For LH and Metro WDM, the typical boards are: AP4, AP8D, AP8S, AS8D, AS8S,

EC8D, EC8S, LDG, LQG, FCED, FCES, LOG, LQS, LWX, LWXR, LWM, LWMR, LWF,

TMX, LBE, ELOG, ETMX, LBF, FDG, LSG, FSG, FCE, LOM, LQM, and L4G.

For the NG WDM, all the OTU boards support the ESC function.

Note: Some of the LWM and LWX boards support the ESC function and the

others do not support the ESC function.


Orderwire configuration

Enable the orderwire function of the NE can provide a

private emergency call channel for the network

maintenance personnel.

The SC1/SC2/ST1/ST2 board must be installed.

Arrangement the order wire number according to Global Data table

as followed.

Refer to Creating a Network, Configuring Orderwire and

Configuring Conference CallsNo. NE Name Topology Name Equipment

TypeSubRack

TypeNE

Extended ID

NE ID Order wire

Conference Phone Remark

1 1-La 1-1 ENTEL LH-DWDM 10G

BWS 1600G 9 1 1001 9999


BWS 1600G 9 2


BWS 1600G 9 3


BWS 1600G 9 4

5 5-Pat 1-1 ENTEL LH-DWDM 10G

BWS 1600G 9 5 1005 9999

6 6-Cara 1-1

ENTEL LH-DWDM 10G

BWS 1600G 9 6 1006 9999


Configuring the Attributes of the WDM-Side Ports During the commissioning, if services cannot be added to the OTU board, you need to

forcibly enable the laser on the WDM side of the board. In addition, follow the following

instructions:

When configuring a wavelength tunable OTU, you need to set the wavelength according to

the engineering design.

The boards connected to each other must work under the same FEC mode.

When configuring the LWX, LWM, LQM, and LBF multi-service integrated boards, you need

to set the service rate and type of every port according to the engineering design.

The GE boards must work under the auto negotiation mode.

The boards accessing multi-services must be configured with proper service types.

The WXCP series boards (ETMX and LOG) must be configured with intra-board cross-

connections.

According to the commissioning requirements for the special OTUs, complete the relevant

configurations of the boards. For details, refer to the corresponding deployment guide.


Checking Network-Wide Software Version and Checking Power Alarm Suppression Status After you query the software version, you obtain the state version

information of each board on the NE. Log in to the client side on the T2000, and choose Report > Board Information Reportfrom the main

menu.

Click the from the Navigator Tree in the left-hand pane to update the Navigator Tree. Then select

the desired NE from the Navigator Tree, and click the double-right-arrow button.

Click Query. If a message indicating a successful operation is displayed in the prompt Operation

Result dialog box, the operation is successful.

Click Close. The status and version information of each board of the NE are displayed in the interface.

Record the versions of the BIOS, software, FPGA.

When the tributary power of the power box in the cabinet endures a

power failure, the T2000 can be used to suppress the POWERALM alarm.

This operation is performed to check the status of the alarm suppression.

More details refer to Commissioning Network


Backing Up NE Database

After the configuration data is delivered, it is required to backup the NE database. The NE database can ensure that the SCC board restores to normal operation automatically upon data loss or power failure.

Log in to the T2000. In the Main Topology, select Configuration > Configuration Data

Management. Select the NE with database to be backed up in the left-hand pane.

Click the double-right-arrow button. Select the NE to be backed up from the list on the right-hand pane. Right-click the NE and select Backup to Database from the drop-

down menu. Click OK in the prompt box.


Sites optical power commissioningThe general commissioning procedure: follow the signal direction sequence to measure optical power at each point. Depending on the spare part power, gain, and insertion loss requirements, exclude abnormal attenuation of line and spare parts. Follow the requirements on optical power commissioning of optical amplifier board, OTU, and monitor signal for commissioning. The signal flow of site can base on the Fiber Connection as followed:


Contents


OTM Commissioning

OLA Commissioning

OADM Commissioning

ROADM Commissioning



System Commission

F

I

U

OBU

OAU

SC1/TC1

MCAMON

DCM

TM

RM

RM

TM

OUT

IN

RC

TC

IN

TDC

RDC

OUT

MON

D40

D01

D40

IN

M40

M01

M40

OUT

LWF

MON

M02 LWF

LWF

OUTRx

LWFD02

LWF

LWF

INTx

5dB

Out line ODF

ClientODF

OUTIN

VOA

FOA

ODF

Fiber

1.OTM Commission


OTM Commission

1. Optical power commission for OTM

The output optical power commission for OTM

Note: Different from the 1600G, the commission for Metro 6100 is dedicated to each wavelength.

LWF M40 OBU FIUSDH

RX OUT M01 OUT IN OUT RC RM OUT

1 1 2 3 3 4 5 6 6 6

SC1 6

LWF M40 OBU FIUSDH

RX OUT M01 OUT IN OUT RC RM OUT

1 1 2 3 3 4 5 6 6 6

SC1 6

－ 2dBm － 9dBm － 2dBm 6dB -19dBm ＋ 4dBm 1dB ＋ 3dBm

－ 2dBm － 9dBm － 2dBm 6dB -19dBm ＋ 4dBm 1dB ＋ 3dBm


OTM CommissionStep

Actions in commissioning OTM transmit optical power

1 Test the optical power of the interconnected SDH equipment of the ODF. The

optical power is -2dBm. Be informed that the client-side of the LWF is the PIN

receive optical module, and the optical power should between -6 and -12dBm. Add

7dB fixed attenuation. The tested optical power of the LWF-RX is -9dBm.

Operations in this step can be performed during the service cutover.

2 After the SDH signals are access or after the lights are forced to emit, test the

optical power of LWF-OUT to see whether the optical power is normal.

3 Test the optical power of M40-M0/M40-OUT. The typical insertion loss of M40 is

about 6dB.

4 Test the optical power of OBU-IN. Adjust the VOA to set the average single-

wavelength optical power of OBU-IN to -19dBm (OBU-3 single-wavelength

standard optical power).

5 Test the optical power of OBU-OUT. The average single-wavelength optical power is about =4dBm.

6 Test the optical power of FIU-RC/FIU-OUT/ SC1-TM/FIU-RM and ODF to set whether the FIU insertion loss and fiber jumper attenuation are normal.

Note: Only the optical power described in step 1 and 4 can actually be adjusted. Other operations are performed to ensure the normal test of the fiber and boards. Attentions are paid to the optical power commissioning of LWF-IN/LWF-OUT/OBU-IN/OBU-OUT.


OTM Commission 1.Optical power commission for OTM

The input optical power commission for OTM

－ 2.5dBm － 2dBm － 9dBm 6dB +4dBm － 20dBm -16dBm 1dB － 15dBm

－ 2.5dBm － 2dBm － 9dBm 6dB +4dBm -24dBm 1dB － 23dBm

LWF D40 OAU FIUSDH

TX IN D01 IN OUT IN TC TM IN

6 6 5 4 4 3 2 1 1 1

SC1 1

DCM

LWF D40 OAU FIUSDH

TX IN D01 IN OUT IN TC TM IN

6 6 5 4 4 3 2 1 1 1

SC1 1

DCM


OTM CommissionStep

Actions of OTM receive optical power commission

1 Test the optical power of the line ODF/FIU-IN/FIU-TC/FIU-TM/SC1-RM. The

attenuation=upstream FIU-RC optical power-local FIU-TC optical power=28dB. The

value is smaller than the planned attenuation (30dB), which indicates that the line

attenuation, FIU, and the fiber connected are all normal.

2 Test the single-wavelength optical power of FIU-TC. The tested value is -24dBm,

smaller than -20dBm (E3OAUC03E standard single-wavelength input optical power).

Remove the VOA, use the short fiber jumper to directly connect FIU-TC/OAU-IN.

3 Set the gain. (The gain=4-(-24) ＝ 28dB)

Test the average single-wavelength optical power of OAU. The value is +4dBm.

4 Test the optical power of the D40-IN/D40-D0 optical ports.

5 Test the optical power of LWF-IN. The value is -2dBm. Add 7dBm fixed attenuation, so that the optical power is -9dBm, meeting the required value between -6 － -10dBm.

6 Test the optical power of LWF-TX. Test the optical power of the client-side ODF (The received optical attenuation at the client equipment is provided and added by the customer).

Note: Except in step 2, 3 and 5, the operations in other steps are performed to test whether the line, fiber jumper and board are normal. If they are all normal, you can skip the corresponding operations.


OTM Commission

F

I

U

O

B

U

O

A

U

TC2TM

RM

RM2

TM2

IN

RC

TCIN

TDC

RDC

OUT

MON

D01

D40

IND40

M01

M40

OUT

LWF

MON

M02 LWF

LWC

OUTRx

LWFD02

LWF

LWC

INTx

LWF

LWF

LWC

TxIN

LWF

LWF

LWC

RxOUT

D40

O

B

U

OUTINOUT

MON

F

I

U

TM

RM

RC

TC

O

A

U

RDC

MON

TDC

TM1

RM1

IN

15dB

OUTINOUTIN

TC2RM2

TM2

TM1

RM1

15dB

VOA DCM

DCM

OUT

OUT

D05

D12 M13 D01M02

D05

D06D06

D12M13M02

D01

IN

D01

M01

M40

M40

FOA

ODF

1. 2OTM in 1600G


OTM Commission

D40

F

I

U

O

B

U

O

A

U

SC2TM

RM

RM2

TM2

IN

RC

TCIN

TDC

RDC

OUT

MON

D01

D40

IN

M01

M40

OUT

LWF

MON

M02 LRF

OUTRx

LWFD02

INTx

LWFTxIN

LWF

LRF

RxOUT

D40

O

B

U

OUTINOUT

MON

F

I

U

TM

RM

RC

TC

O

A

U

RDC

MON

TDC

TM1

RM1

IN

15dB

OUTINOUTIN

SC2RM2

TM2

TM1

RM1

15dB

VOA DCM

DCM

OUT

OUT

D05

D12 M13 D01M02

D05

D06D06

D12M13M02

D01

IN

D01

M01

M40

M40

FOA

ODF

D02

M02

M40

D40

1. 2OTM in 6100


Questions Questions

1. If the fiber/cable is normal and no fault occurs on the board, what operations should be performed to commission the OTM optical power?

2. If the average single-wavelength optical power received at FIU-TC is -16dBm, how to adjust the optical power?

3. Are there any differences between the OTM commissioning for the Metro 6100 and for the Metro 1600G?

4. In the previous example, the optical power commissioning is on a single wavelength basis. If no spectrum analyzer is available, how to perform commissioning based on the total optical power?


Contents


OTM Commissioning

OLA Commissioning

OADM Commissioning

ROADM Commissioning



OLA Commission

F

I

U

F

I

U

OBU

OAU

DCM

SC2/TC2

OUT

RM RM2

RMRM1TM

TM1 TM

TM2

RC

MON

OUT

IN

IN

MON

IN

RDC

TDC

DCM

OUT IN OUT

RDC

TDC

TCRC

TC

INOUT

MON

D05 D09

D01 D03

OAU

D12


OLA Commission 1. OLA optical power commission

OLA optical power commission

Site B (CBA direction) two wavelengths/32dB attenuation

(including FIU insertion loss).

The calculated OSNR is as follows: the output OSNR of the OBU at

the upstream site C is 33dB. The output OSNR of the local OAU is

24.13dB. The output OSNR of the OUB at site A is 23.6dB.

FIU OAU DCM FIU

IN TM TC IN OUT IN OUT RC RM OUT

SC1

OBU

-28 +4 － 19 +4

FIU OAU DCM FIU

-24.7 +9.1 -13.9 +9.3

OBU


OLA CommissionStep

Actions of OLA Optical Power Commissioning － (Single Wavelength Optical Power Commissioning)

1 Test the optical power of the line ODF/FIU-IN/FIU-TC/FIU-TM/SC2-RM1. The

attenuation=upstream FIR-RC optical power-local FIU-TC optical power=32dB.

This value is smaller than 33dB, the planned attenuation. This fact indicates that

the line attenuation, FIU, and the connected fiber are all normal.

2 Test the single wavelength optical power of FIU-TC. The value is -28dBm, smaller

than -20dBm (E3OAUC03E standard single wavelength input optical power).

Remove the VOA and use the short fiber jumper to directly connect the

FIU-TC/OAU-IN.

3 Set the gain as follows: 4- (-28) ＝ 32dB. Test the single wavelength optical

power at OAU. The tested output single wavelength optical power should be

between 3.5 and 4.5dBm.

4 Adjust the VOA in front of the DCM so that the average input single wavelength

optical power of the OBU is -19dBm.

5 Test the average single wavelength optical power of OBU-OUT. The value is around =4dBm.

6 Test the optical power of FIU-RC/FIU-OUT/ SC2-TM2/FIU-RM and ODF to see whether the FIU insertion loss and the fiber jumper attenuation are normal.

Note: The OLA optical power commissioning is the same as the commissioning for the OAU, FIU, and line of the OTM. In case the fiber jumper quality is ensured, the commissioning is mainly for the optical power of the OAU.


OLA CommissionStep

Actions of OLA Optical Power Commissioning － (General Wavelength Optical Power Commissioning)


attenuation=upstream FIR-RC optical power-local FIU-TC optical power=32dB. This

value is smaller than 33dB, the planned attenuation. This fact indicates that the line

attenuation, FIU, and the connected fiber are all normal.

2 Calculate the single wavelength optical power of OAU-IN. The evaluated offset =

0.3dB. The general standard optical power = -20+10lg2+0.3 = -16.7dBm. The tested

FIU-TC optical power is -24.7dBm, smaller than -16.7dBm. Remove the VOA in front of

the OAU.

3 Calculate the average single wavelength optical power of the OAU-IN. The value =

24.7 － 10lg2 － 0.3 = -28dBm. Set the gain as follows: 4 － (-28) ＝ 32dB. Then the

tested output is 9,1dBm, compliant with the calculated offset, which is 2.1dB.

4 Calculate the standard general optical power of OBU-IN as follows: -19+10lg2+2.1 = -

13.9dBm. Adjust the VOA in front of the DCM so that the optical power of OBU-IN is -

13.9dBm.

5 Test the average single wavelength optical power of OBU-OUT. The value is around =9.3dBm.

6 Test the optical power of FIU-RC/FIU-OUT/SC2-TM2/FIU-RM and ODF to see whether the FIU insertion loss and the fiber jumper attenuation are normal.


OLA CommissionStep

Actions of OLA Optical Power Commissioning － (Improved General Wavelength Optical Power Commissioning)


attenuation=upstream FIR-RC optical power-local FIU-TC optical power=32dB.

This value is smaller than 33dB, the planned attenuation. This fact indicates that

the line attenuation, FIU, and the connected fiber are all normal.

2 The output optical power of the upstream is 7.3dBm. The local standard general

optical power is 7.3 － (4 － (-20)) ＝ -16.7dBm, and the tested FIU-TC optical

power is -24.7dBm, smaller than -16.7dBm. Remove the VOA in front of the OAU.

3 Calculate the average single wavelength optical power of OAU-IN as follows: 4 －(7.3 － 24.7) = － 28dBm. Set the gain as follows: 4 － (-28) ＝ 32dB. The tested

output is 9.1dBm.

4 Calculate the standard general optical power of OBU-IN as follows: 9.1 － (4 － (-

19) ＝ -13.9dBm. Adjust the VOA in front of the DCM to set the optical power of

OBU-In to -13.9dBm.

5 Test the average single wavelength optical power of OBU-OUT. The value is around =9.3dBm.

6 Test the optical power of FIU-RC/FIU-OUT/SC2-TM2/FIU-RM and ODF to see whether the FIU insertion loss and the fiber jumper attenuation are normal.


OLA Commission

The commissioned single wavelength input optical power of

downstream OAU = upstream output standard single wavelength

optical power － (queried general output optical power of

upstream OAU － queried general input optical power of

downstream OAU).

Downstream OAU gain = standard single wavelength output

optical power of downstream OAU － commissioned single

wavelength input optical power of downstream OAU = (standard

single wavelength output optical power of downstream OAU － standard single wavelength output optical power of upstream

OAU) + (queried output general optical power of upstream OAU －queried input general optical power of downstream OAU)


Questions

1. Can the DCM position and the VOA position be exchanged between?

Why?

2. Can the DCM configured for OAU+OBU be placed between the TDC

and RDC of the OAU?

3. How to use the three ways of commissioning to practice the optical

power commissioning from ABC. Suppose four wavelengths are

available, and the output OSNRs of the four OAU are respectively 33dB,

30dB, 23.6dB, and 23.13dB.

Questions


Contents


OTM Commissioning

OLA Commissioning

OADM Commissioning

ROADM Commissioning



OADM Commission

F

I

U

O

B

U

OAU

TC2TM

RM

RM2

TM2

OUT

IN

RC

TC

IN

TDC

RDC

OUT

MON

IN

OUT

MON

OBU

OUT

INOUT

MON

F

I

U

TM

RM

RC

TC

OBU

MON

TM1

RM1

OUT

IN

OUTINOUTINM

R

2

M

R

2

M

R

2

M

R

2

LWX

LWX

IN

MI

MO

OUT

IN

MI

MO

MO

MI

IN

OUT

MO

LWX

LWX

LWX

LWX

LWX

LWX

5dB

DCM

DCM

VOA

FOA

ODF

Fiber


OADM Commission 1. OADM optical power commission

On station E (FED direction), four wavelengths are added/dropped, and four

are passed through. The output OSNR of the receive OAU is 25.86dB. The optical

power commissioning for FIU/ODF and SC2 is the same as that for the OLA. The

optical power commissioning for the OUT to ODF direction is the same as the OTM

optical power commissioning. Other parts are illustrated in the following figure.

Note: 1.The VOA between the OAU and OADM is available for the Metro 1600G,

but not the Metro 6100. 2. You need to add fixed attenuation for the drop

wavelength of the PIN of the Metro 6100G, but not the Metro 1600G.

OAU MR2 MR2 OBU

OUT IN MO IN MO MI OUT MI OUT IN

MR2MR2

LWF

LWF

LWF

LWF

LWF

LWF

LWF

LWF

－ 6 dBm

－19dBm


OADM CommissionStep Actions of OADM Optical Power Commissioning － (Single

Wavelength Optical Power Commissioning)

1 Adjust the VOA of the receive OAU and OADM so that for the OADM, the optical

power of the drop wavelength that has the smallest insertion loss is -6dBm. (Metro

6100 does not have the attenuator, and needs not to be adjusted.)

2 Test the optical power of the drop wavelength from LWF-IN. The largest optical

power is -6dBm and others are about -6.5dBm, -8dBm, and -8,5dBm. If the

wavelength dropped from the OUT is received by APD, you need to add 10dBm

attenuation. (For the Metro 6100, you need to add the fixed attenuation, and add a

10dBm attenuator for LWF. The input optical power of LWF is about -8dBm.)

3 Use the spectrum analyzer to test the single wavelength optical power of the OBU-

IN. Adjust the VOA between the west and east OADMs so that the average single

wavelength optical power of the pass-through wavelengths is -19dBm (standard

OBU single wavelength optical power) at the transmit OBU-IN.

4 Adjust the VOA between the MR2 and each LWF-OUT with wavelengths added so

that the single wavelength optical power of each added wavelength is -19dBm on

the OBU-IN.

Merit You can use the MON port of the OAU to perform the commission without interrupting the signals of the wavelengths dropped, added and passing through the local NE. You do not need to calculate the Offset.

Defect A spectrum analyzer is required.


OADM Commission

Note: The single wavelength optical power of the pass-through

wavelengths can be a bit higher than the added wavelength. The

final average single wavelength optical power is -19dBm. Why?

To equalize the OSNR, you can elevate the OSNR because the

optical power of pass-through wavelengths are comparatively low.


OADM Commission

OAU MR2 MR2 OBU


MR2MR2

LWF

LWF

LWF

LWF

LWF

LWF

LWF

LWF

－ 6 dBm

－19dBm

OAU MR2 MR2 OBU


MR2MR2

LWF

LWF

LWF

LWF

LWF

LWF

LWF

LWF

－ 6 dBm

－12.3dBm

Adjust this VOA

Adjust this VOA


OADM Commission

Step Actions of OADM Optical Power Commissioning － (General Optical Power Commissioning)

1 Adjust the VOA of the receive OAU and OADM so that for the OADM, the optical

power of the drop wavelength that has the smallest insertion loss is -6dBm. (Metro

6100 does not have the attenuator, and needs not to be adjusted.)

2 Test the optical power of the drop wavelength from LWF-IN. The largest optical

power is -6dBm and others are about -6.5dBm, -8dBm, and -8,5dBm. If the

wavelength dropped from the OUT is received by APD, you need to add 10dBm

attenuation. (For the Metro 6100, you need to add the fixed attenuation. Add a

10dBm attenuator for LWF. The input optical power of LWF is about -8dBm.)

3 Disconnect the add-wavelength fiber or shut down the add-wavelength LWF laser.

Adjust the VOA between the east and west OADMs so that the optical power of the

pass-through wavelength at the transmit OBU-IN is -12.3dBm, which is calculated

as follows: -19+10lg4+0.7= -12.3dBm.

4 Disconnect the fiber between the east and west MR2s. Each time only enable the

WDM-side laser of the LWF of one wavelength. Adjust the VOA between the add-

wavelength LWF-OUT and the MR2 so that the optical power of OBU-IN is -19dBm.

Merit No spectrum analyzer is required.

Defect

The Offset may not be precise. To calculate the Offset, you need the OSNR value, and need to shut down the add-wavelength laser and the pass-through wavelength at the local station.


OADM CommissionStep Actions of OADM Optical Power Commissioning － (Improved General Optical

Power Commissioning)

1 Adjust the VOA of the receive OAU and OADM so that for the OADM, the optical power of the drop

wavelength that has the smallest insertion loss is -6dBm. (Metro 6100 does not have the attenuator,

and needs not to be adjusted.)

2 Test the optical power of the drop wavelength from LWF-IN. The largest optical power is -6dBm and

others are about -6.5dBm, -8dBm, and -8,5dBm. If the wavelength dropped from the OUT is received

by APD, you need to add 10dBm attenuation. (For the Metro 6100, you need to add the fixed

attenuation. Add a 10dBm attenuator for LWF. The input optical power of LWF is about -8dBm.)

3 Shut down the local laser used for wavelength drop from the upstream station, and test the OAU

output optical power, which is 10.7dBm. Disconnect the add-wavelength fiber or shut down the add-

wavelength LWF laser. Adjust the VOA between the east and west OADMs so that the optical power of

the pass-through wavelength at the transmit OBU-IN is -12.3dBm, which is calculated as follows: -

10.7 － (4 － (-19)) ＝ -12.3dBm.

4 Disconnect the fiber between the east and west MR2s. Each time only enable the WDM-side laser of

the LWF of one wavelength. Adjust the VOA between the add-wavelength LWF-OUT and the MR2 so

that the optical power of OBU-IN is -19dBm

Merit To calculate the Offset, you neither need the OSNR nor the spectrum analyzer.

Defect

You need to shut down laser used to drop the wavelength from the upstream, and shut down the add-wavelength laser and the pass-through wavelength at the local station.


Questions Question

1. If there is temporarily no pass-through wavelength on an

OADM, can the pass-through VOA of the east and west

MR2s not be adjusted, or can it be directly connected with a

fiber?

2. If there are two channels of add/drop wavelengths and

two channels of pass-through wavelengths, but four

wavelengths are tested at the east MO. Why does this

happen considering there should only be two wavelengths

passing through?


Contents


OTM Commissioning

OLA Commissioning

OADM Commissioning

ROADM Commissioning



ROADM Commission

FIU

FIUTo D

IN

OUT

To F

OUT

IN

Site E

SC2RM1

TM1RM

TM RMTM2

TMRM2

OBU

OUT OUT

OUT IN OUTOUT

TC

RCININ

INRC

OBU OAU

OBU

TDCRDC

DWC DWCINTC OUT

DCM

D40

LWF

LWF

LWF

LWF

D40

MO

MI

MI

MO

DROP ADD DROP

West East

M40 M40

ADD

ROADM in OptiX BWS 1600G


ROADM Commission

ROADM in OptiX OSN 6800

FIU

FIUTo D

IN

OUT

To F

OUT

IN

Site E

SC2RM1

TM1RM

TM RMTM2

TMRM2

OBU1

OUT OUT

OUT IN OUT OUT TC

RCININ

INRC

OBU1 OAU1

OBU1

TDCRDC

ROAM ROAMINTC OUT

DCM

D40

LQM

L4G

LQM

L4G

D40

EXPO

EXPI

EXPI

EXPO

DMM01

DMM01

West East


ROAM Commission

… …

…

EXPI

EXPO

OUT

IN

DM

Mn

40

ROAM

Coupler

ROAM board of OSN 6800 DWC board of 1600G

Inside a ROAM board is actually a PLC ROADM plus a coupler that is used to implement the optical power division. One channel is dropped at the local site, and the other channel is transmitted to the opposite ROAM. The PLC ROADM in the ROAM controls the pass-through optical signals.

The PLC ROADM in the ROAM board has the power detection function. So the optical power detection and MON port are not configured. The embedded optical power detection function detects the optical power of each channel at the in port and the out port.

The VOA in the PLC ROADM component equalizes the optical power.


ROADM Commission

1. ROADM optical power commission － DWC+DWC Two added or dropped wavelengths/two pass-through wavelengths. The

optical power commissioning for the FIU/ODF and for SC2 is the same as

that for the OLA. The optical power commissioning for the OTU to ODF is

the same as that for the OTM. The commissioning for the receive OAU is

the same as that for the OLA. The parts using different ways of

commissioning are shown in the following figure.

Note: Currently, only the 1600G supports the DWC.

OAU

OUT IN MO MI OUT IN

OBUDWCDWC

LWF

LWF

<4dB －19dBm

D404dBm <8dB 6.5dB

<12dB

M40

LWF

LWF

6.5dB <4dB


ROADM Commission

Step

Actions of ROADM Optical Power Commission －DWC+DWC

1 Dispatch wavelengths. Set congestion for the wavelength to be

dropped, and set pass-through for the pass-through

wavelengths. (Note: Set these attributes at the receiving

direction of the DWC.)

2 Connect the optical power to the fiber jumper of the IN port of the

west LWF and do not add optical attenuation to the PIN. In this

case the WDM-side input optical power of the OTU is 4-6-6 = -

8dBm. Add 10dBm optical attenuation for the ADP and the WDM-

side input optical power of the OTU is 4-6-6-10 = -18dBm, which

meets the requirement for the optical power.

3 Test the optical power of the IN port of the OBU and set attenuation

for the wavelengths passing through the DWC so that the tested

single-wavelength optical power is -19dBm.

4 Test the optical power of the IN port of the OBU and adjust the VOA

between the M40 and DWC so that the tested optical power of an

added single wavelength is -19dBm.


ROADM Commission 1. ROADM optical power commission － ROAM+ROAM

Two added or dropped wavelengths/two pass-through wavelengths. The

optical power commissioning for the FIU/ODF and for SC2 is the same as

that for the OLA. The optical power commissioning for the OTU to ODF is

the same as that for the OTM. The commissioning for the receive OAU is

the same as that for OLA. The parts using different ways of commissioning

are shown in the following figure.

Note: Currently only the NG WDM supports ROAM.

OBU1 OBU1

OUT IN EXPO EXPI OUT IN

ROAMROAM

L4G

LQM

<14dB －19dBm

D40

L4G

LQM

4dBm <7dB <6.5dB

<3dB


ROADM CommissionStep

Actions of ROADM Optical Power Commission －ROAM+ROAM

1 Create fiber connections on the T2000.

2 On the T2000, create optical cross-connections from the west FIU to

the east FIU and optical cross-connections from the east transmit

end of OTU to the east FIU.

3 Set the rated optical power at the IN port of the east transmit end of

OBU to -19dBm (typical input single-wavelength optical power of

OBU1). The system automatically sets the pass-through wavelength

and the add wavelength at the ROAM-OTU to -19dBm.

4 Connect the optical power to the fiber jumper of the IN port of the

west OTU and do not add optical attenuation to the PIN. In this case

the WDM-side input optical power of the OTU is 4-6-6 = -8dBm. Add

10dBm optical attenuation for the ADP and the WDM-side input

optical power of the OTU is 4-6-6-10 = -18dBm, which meets the

requirement for the optical power.


ROADM Commission

Site E

West East


ROADM Commission 1. ROADM optical power commission －

WSM9+WSD9/ WSMD4+WSMD4 Two added or dropped wavelengths/two pass-through wavelengths. The

optical power commissioning for the FIU/ODF and for SC2 is the same as that

for the OLA. The optical power commissioning for the OTU to ODF is the same

as that for the OTM. The commissioning for the receive OAU is the same as

that for OLA. The parts using different ways of commissioning are shown in

the following figure.

OBU1 OBU1


WSM9WSD9

L4G

LQM

－19dBmD40 M40

L4G

LQM

L4G

LSR

L4G

LQM

4dBm

<8dB <8dB

<8dB <8dB


ROADM Commission

Step Actions of ROADM Optical Power Commission － WSD9+WSM9 (NG WDM)

1 On the T2000, create optical cross-connections from the west FIU to

the west FIU, optical cross-connections from west FIU to east FIU, and

optical cross-connections from the east transmit end of OTU to the

east FIU.

2 Set the optical power at the OUT port of the west receive end of the

OAU1 to 4dBM (standard single-wavelength output optical power).

Set the rated optical power at the IN port of the east transmit end

of the OBU1 to -19dBm (standard single-wavelength input optical

power). Set the receive optical power of the OTU that drops

wavelengths to -8dBm (The allowed margin is base on the optical

power commissioning requirements).

3 WSD9 and WSM9 automatically adjust the optical power of the

wavelengths dropped from the east OTU, added to the east OTU and

passing through from the east. In this way the average input optical

power at the IN port of the east transmit end of OBU1 and the receive

optical power of the drop-wavelength OTU meet the requirement.



Actions of ROADM Optical Power Commission － WSD9+WSM9 (1600G)

1 Refer to Configuring ROADM (WSS Mode), finish the cross-connect

configuration.

2 Test the input optical power of the LWF-IN. Set the drop-wavelength EVOA

of the WSD9 so that the tested value is about -8dBm.

3 Test the optical power at the IN port of the east transmit end of the OBU

and adjust the attenuation of WSD9/WSM9 so that the tested optical

power of the pass-through wavelengths is -19dBm. (Set the EVOA

attenuation.)

If no spectrum analyzer is available, congest the added wavelength to

test the IN optical power of the OBU. Meanwhile, reduce or increase

the attenuation of the pass-through wavelengths of WSD9/WSM9 so

that the optical power matches the calculated general optical power

(the same as the OADM commission).

4 Test the optical power at the IN port of the east transmit end of the OBU

and adjust the attenuation of WSM9 so that the tested optical power of

the added wavelengths is -19dBm. (Set the EVOA attenuation.)

If no spectrum analyzer is available, congest the pass-through wavelength

to test the IN optical power of the OBU. Meanwhile, reduce or increase the

attenuation of the added wavelengths of WSM9 so that the optical power

is -19dBm.

Restore the original configurations.


ROADM Commission

－19dBm

West East


ROADM Commission

Site E

West East


ROADM Commission

EXPI OUT

MI

MO

Add

RMU

MON

MON

When the RMU is used for inter-ring interconnection, only the Add to MO section is involved. Hence, if the WSS+RMU is used in inter-ring interconnection, the default pass-through port is no longer the IN port, but one of the Add ports.

RMU also supports cascading multiple levels and adding/dropping more wavelengths. But this way of configuration is not recommended because in this scenario, the optical power budget is very tight.

The optical detection function and MON port are configured at the IN and MO ports of the RMU. They are used to supervise the optical signals and detect the in signals and out signals by using the external meters or the MCA functional unit.

RMU is mainly used together with WSS to realize the wavelength adding at the local site and the inter-ring connections from multiple directions.

Normally, you only need to cascade MI and MO to add or drop the local wavelength through the Add port.

If the optical power budget for some adding signals is tight, you can cascade an amplifier between MI and MO. For example, if the optical power becomes low after a 10G signal experiences the duel fed and selective receiving at the OLP, the optical power may be too low for an add wavelength. In this case, you need to cascade an amplifier to solve the problem.


ROADM Commission

The RMU is used to play the part of the multiplexing function of WSS.

Since the Add port is insensitive to the wavelengths, RMU enables any

wavelengths to be added from any port. RMU includes a 1*2 combiner

and a 1*8 combiner. When it is used as an intra-ring ROADM, the MI

and MO can be directly connected, and an amplifier can be cascaded.

The 1*8 combiner is used to combine the adding signals, and the 1*2

combiner is used to combine the local signals with the pass-through

signals. When it is used as an inter-ring ROADM, the MI and OUT ports

are not involved in the channel combination. Only the 1*8 combiner is

used to combine the signals from different directions.


ROADM Commission 1. ROADM optical power commission － RMU9+WSD9

Four added or dropped wavelengths/four pass-through wavelengths.

The optical power commissioning for the FIU/ODF and for SC2 is the

same as that for the OLA. The optical power commissioning for the

OTU to ODF is the same as that for the OTM. The commissioning for

the receive OAU is the same as that for OLA. The parts using different

ways of commissioning are shown in the following figure.

OBU1 OBU1


RMU9WSD9

LWF

LWF

－19dBmD40 MR4

LWF

LWF

LWF

LWF

LWF

LWF



Actions of ROADM Optical Power Commission － WSD9+RMU9 (NG WDM)

1 On the T2000, create optical cross-connections from the west FIU to the west receive

end of the OTU, optical cross-connections from west FIU to east FIU, and optical

cross-connections from the east transmit end of OTU to the east FIU.

2 Set the optical power at the OUT port of the west receive end of the OAU1 to 4dBM

(standard single-wavelength output optical power). Set the rated optical power at

the IN port of the east transmit end of the OBU1 to -19dBm (standard single-

wavelength input optical power). Set the receive optical power of the OTU that

drops wavelengths to -8dBm (The allowed margin is base on the optical power

commissioning requirements).

3 WSD9 and WSM9 automatically adjust the optical power of the wavelengths dropped

from the west OTU, directly added to the east OTU and passing through from the

east. In this way the average input optical power at the IN port of the east transmit

end of OBU1 and the receive optical power of the drop-wavelength OTU meet the

requirement.

4 The east OTU adds wavelengths through OADM or M40. You need to adjust the VOA of the OTU and M40 as follows. Test the output optical power of M40. Set the VOA to the lowest and find out the wavelength that has the lowest optical power. Adjust the VOA for all other wavelengths so that the single-wavelength optical power of each wavelength equals to the lowest optical power.

5 Set the channel insertion loss for the multiplexed wavelength of the OTU that is indirectly connected to the RMU so that the tested single-wavelength optical power of OBU-IN is -19dBm.


Contents


OTM Commissioning

OLA Commissioning

OADM Commissioning

ROADM Commissioning




Optical power equilibrium commissioning

Board Performance Optimization

Fiber connection and wavelength end-to-end

management.

Protection commissioning

Intelligent optical power management


Optical power equilibrium commissioning The V40/V32 and DGE are

used for optical power

equilibrium commissioning.

Adjustment: Monitor the

optical power of single

wavelength and OSNR of the

optical amplifier at the

receive end and adjust the

attenuation of each

wavelength of the

V40/V32/DGE at the transmit

end.

Step Operation instruction

1 Adjust the VOA attenuation of respective channels of V40 at the originating end to 5dB;

2 Adjust the optical power of this regenerator section following the instruction introduced Commissioning the optical power of combined signals

3 Connect the spectrometer to the MON optical interface of the last-stage optical amplification board, and measure the optical power and signal-to-noise ratio of each channel in WDM mode;

4 Find the channel with the maximum and minimum optical power (or signal-to-noise ratio) in the spectrogram measured, then adjust the VOA of the corresponding V40 channel to make the optical power (or signal-to-noise ratio) close to the average value;

5 Repeat Step 4 until the biggest difference of the optical power (or signal-to-noise ratio) in all the channels is within 4dB (or 2dB);

6 When the above steps are done, usually the total input and output optical power of respective amplifier stages will not change obviously and the commissioning is completed. If the change is relatively obvious, the VOA before the first-stage optical amplifier has to be re-adjusted to make its input optical power reach the standard, while the optical power of the subsequent optical amplifiers need not be adjusted.


Board Performance Optimization After adjusting the receive OSNR of the OTM, query the BER before correction of

every OTU to check whether the BER before correction is flat. If the BER before

correction of a channel is greater than the average BER before correction, optimize the

channel performance through the following two methods:

Method Principle Operation

Improving

OSNR

OSNR degrade varies indirectly with the

input power of an OAU. Thus, you can

improve the receive OSNR by increasing

the per-channel power of the OAU.

Decrease the attenuation of the corresponding

channel on the V40/DGE at the transmit end to

improve the receive OSNR.

Reducing

non-

linearity

Non-linear effects are caused when the

incident power is excessively high.

Increase the attenuation of the corresponding

channel on the V40 at the transmit end to reduce

the input power of every OAU on the link.

"Reducing non-linearity" is a inverse operation of "improving OSNR". Thus, you need to make a balance between the non-linearity and OSNR when commissioning the per-channel power, to ensure the best quality signals. In general, "improving OSNR" is used for per-channel performance optimization.


Fiber connection and wavelength end-to-end management.

The NM system

provides fiber

connection and end-to-

end management at the

user’s requirement.

The function of

wavelength end-to-end

management need the

license to support.


Protection commissioning and Intelligent optical power management

Protection commissioning please refer to

Configuring Service Protection

Intelligent optical power management please refer

to Configuring IPA Protection

Configuring APE Pair

Configuring EAPE Pair

Configuring ALC


Summary

In this chapter ,we have learned:

System Commissioning process

OTM Commissioning

OLA Commissioning

OADM Commissioning

ROADM Commissioning



Contents



and Method


Check the Result of

Commissioning


Requirements on Optical Power and OSNR

After the commissioning, make sure that the system optical power and OSNR

can meet the design requirements.

If it is confirmed that the line attenuation is excessively high, which causes very

low optical power and OSNR, you need to consult with the customer on

replacing the fiber core of the optical cable or rectifying the optical cable.

The requirements on the optical power flatness and the requirements on the

OSNR flatness should be satisfied at the same time. If the former conflicts with

the latter, the latter enjoys a higher priority provided that the optical power

specifications meet the design requirement.

Fill in the Optical Power Commissioning Record Table.


Performance Alarm Acknowledgement

Alarms Query alarms and determine the causes, and then solve the problem.

Performance events Query the abnormal performance events and determine the causes, and then solve the

problem.

Acknowledgement of FEC performance values: The BER before FEC must be below

10-7, that is, the performance value must be below 7. Shown below are some examples: fec_cor_0bit_cnt 395935

fec_cor_1bit_cnt 396557

fec_cor_byte_cnt 792492

fec_bef_cor_er 7

fec_aft_cor_er 0

For details, refer to the

Backbone DWDM Optical Transmission System Alarms and Performance Events Reference

BER before FEC


BER Test

The BER test is the final phase of system commissioning and the test results are the key

indexes used to measure the quality of the DWDM system. The BER test mainly verifies

the system stability when no anomaly occurs.

The BER test must last for consecutive 24 hours and the test must be performed for

every service channel. According to the arrangement of serial connection test, before

the BER test, you should complete the loopback test and serial connection test. The

BER test on the system should be performed according to the Acceptance Guide to WDM Products.

Precautions: On the test equipment, set the PRBS of the receive and transmit signals to 223-1; set the external clock

as the reference clock and the test time period to 24 hours. After performing the test, print out the test

results. (Note: After performing the project commissioning, you can use the built-in PRBS function of the

OTU board to perform the BER test. For details, refer to the Special Topic on OptiX WDM Products PRBS

Function.)

Before performing the BER test, use the NMS to monitor the entire system to facilitate the fault

localization and performance analysis on the NMS.

Ensure that there is no bit errors during the current 24 hours. If bit errors occur, determine the causes and

solve the problem. Then, perform the 24-hour BER test for a second or third time until no bit error occurs.


Software quality inspection standard

After commissioning, please finish the check

according to

Software Quality Inspection Standard for 1600G an

d 320GV3R4 and 6100V1R3

Pigeonhole the engineering documents.


Summary

In this course, we have learned:

The commission requirement and method for WDM deployment

The WDM deployment and commission of typical network

The optical power commission for WDM product

Thank You

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