7 - otc107201 optix osn 380068008800 optical power calculation issue 1

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.

OptiX OSN 3800/6800/8800 Optical Power Calculation

Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page1

Objectives

Upon completion of this course, you will be able to:

Illustrate the relation of each reference point.

List the common indices on optical power calculation.

Calculate the optical power.


Contents

1. Basics

2. Power Calculation


Contents

1. Basics

1.1 Review of the signal flow

1.2 Basic Concepts


Review of Signal Flow

OTUM40

M40

M40D40

F

I

USC1

OA

SC2

OTU

OTU

OTU

OA OA

OA

F

I

U

F

I

U

F

I

U

OA

M40D40

OTU

OTU

OTU

OTU

M40

M40OA

OTM1OTM1 OLAOLA OTM2OTM2

SC1

VOA


Review of Signal Flow (Cont.)

F

I

U

F

I

U

SC2

MR2

OA

OAMR2

MR2

MR2

OA

OA

FOADMFOADMOTU

OTU

OTU

OTU

OTU

OTU

OTU

OTU



F

I

U

F

I

U

SC2

ROAM

OA

OA OA

OA

ROADM:ROADM:(ROAM)(ROAM)

ROAM

M 4 0D40M 4 0D40

OTU

OTU

OTU

OTU

…… ……



F

I

U

OA

OA

WSD9 RMU9

RMU9 WSD9

OA

OA

F

I

U

M 4 0D40

M40 D40

ROADM:ROADM:(WSD9+RMU9)(WSD9+RMU9)

MR4

MR4

OTU

OTU

OTU

OTU

OTU

OTU

OTU

OTU

OTU

OTU

OTU

OTU

OTU

OTU

OTU

OTU

……

…… ……

……


P (dBm) =10lg

-10dBm = mW

0dBm = mW

10dBm= mW

20dBm = mW

20dBm-10 =10dBm

Units

mW

the unit of optical power

dBm

the unit of optical power

dB

the unit of gain or attenuationof optical power

P(mW)

1(mW)

Calculation

Basic Concept


Formula

The situation of N wavelengths

Ptotal (dBm) ＝Psingle (dBm) +10lgN(dB)

P1

Ptotal

P2

P1=P2=Psingle

Ptotal (mW) ＝ P1 (mW) + P2 (mW)

Ptotal (dBm) ＝Psingle (dBm) +10lg2(dB)


Insertion Loss

The loss of output optical power after the optical signals of

each channel pass through the corresponding channels.

Passive component

PoutPin

Insertion Loss (IL) = Pin–Pout

Unit: dB


Common Indices

Name Insertion Loss Name Insertion Loss

FIU≤ 1 dB (IN-TC, RC-OUT)

MR2≤ 1.5 dB (Add/Drop)

≤ 1.5 dB (IN-TM, RM-OUT) ≤ 1.0 dB(IN-MRO,MRI-OUT)

MR8≤ 4 dB (Add/Drop)

CMR4≤ 4 dB (Add/Drop)

≤ 3.5 dB (IN-MRO,MRI-OUT) ≤ 3.5 dB (IN-MRO,MRI-OUT)

MR4≤ 2.2 dB (Add/Drop)

CMR2≤ 1.5 dB (Add/Drop)

≤ 1.5 dB (IN-MRO,MRI-OUT) ≤ 1.0 dB (IN-MRO,MRI-OUT)


Common Indices (Cont.)

Note: a. This value can be reached when the VOA is set to minimum.

Name Insertion Loss Name Insertion Loss

RMU9

≤ 8.5 dB (EXPI-OUT)

ROAM

≤ 9 dB (Mx-OUT)

≤ 12.5 dB (AMx-TOA) ≤ 7 dB (IN-DM)

≤ 1.5 dB (ROA-OUT) ≤ 14 dB (EXPI-OUT)

WSD9 ≤ 8 dB (IN-DMx, IN-EXPO) ≤ 3 dB (IN-EXPO)

ITL

<4.5 dB (RE-OUT, RO-OUT) M40/D40 ≤ 6.5 dB

<2.5 dB (IN-TE, IN-TO,

TN11ITL)

<3.5 dB (IN-TE, IN-TO,

TN12ITL)

M40V/D40V ≤ 8a dB

DCM (S/A-F) 2.5/4/5/7/8/9/10 (dB) (G.652)


Characteristics of OA

Nominal Input Power ①

Nominal Output Power②

Maximum output power of a single wavelength③

Gain

OA

Pout ②Pin ①

Pout ③

Gain = Pout (dBm) – Pin (dBm)


Name Input Power

RangeNominal output

PowerMaximum output power of

a single wavelength Gain range

OBU101 -32～-4 dBm 16 dBm 0 dBm 20dB

OBU103 -32 ~ -3 dBm 20 dBm 4 dBm 23dB

OBU104 -32 ~ -1 dBm 16 dBm 0 dBm 17dB

OBU205 -24 ~ 0 dBm 23 dBm 7 dBm 23dB

HBA -19 ~ -3 dBm 26 dBm 10 dBm 29dB

OAU101 -32 ~ 0 dBm 20 dBm 4 dBm 20～31dB

OAU102 -32 ~ -3 dBm 17 dBm 1 dBm 20～31dB

OAU103 -32 ~ -4 dBm 20 dBm 4 dBm 24～36dB

OAU105 -32 ~ 0 dBm 23 dBm 7 dBm 23～34dB

CPRCGain ≥10dB (on G.652 fiber)

Gain ≥12dB (on G.655 LEAF fiber)

Common Indices (40 Channels)


Common Indices (80 Channels)

Name Input Power

RangeNominal output

PowerMaximum output power of

a single wavelength Gain range

OBU101 -32～-4 dBm 16 dBm -3 dBm 20dB

OBU103 -32 ~ -3 dBm 20 dBm 1 dBm 23dB

OBU104 -32 ~ -1 dBm 16 dBm -3 dBm 17dB

OBU205 -24 ~ 0 dBm 23 dBm 4 dBm 23dB

OAU101 -32 ~ 0 dBm 20 dBm 1 dBm 20～31dB

OAU102 -32 ~ -3 dBm 17 dBm -2 dBm 20～31dB

OAU103 -32 ~ -4 dBm 20 dBm 1 dBm 24～36dB

OAU105 -32 ~ 0 dBm 23 dBm 4 dBm 23～34dB


Characteristics of OTU

Mean Launch Power

Receiver sensitivity: A

Receiver overload: B

Recommended Receiving Power Range: A+3(dBm) ~ B-5(dBm)


Common Indices

NameMean Launch Power (dBm)

Receiving power RangeRemark

PIN (dBm) APD (dBm)

LSXL / NS3 -5 ~ 0 -16 ~ 0 —

DWDM

side

LSX / TMX / LOG /

NS2

-3 ~ 2 -16 ~ 0 -26 ~ -9

ND2 / NQ2 -3 ~ 2 -16 ~ 0 —

L4G -3 ~ 2，-2 ~ 2 — -25 ~ -9

LDGD / LQMD -8 ~ -4，-5 ~ 0 -18 ~ 0 -28 ~ -9

LDGS / LQMS -5 ~ -1, -2 ~ 3 -18 ~ 0 -28 ~ -9


Questions

What are the units related to optical power?

The conversion between mW and dBm?

If the input power of each channel is -4dBm, what’s the value of

input power for 40 wavelengths?


Contents

1. Basics

2. Power Calculation


Contents

2. Power calculation

2.1 Power calculation of OSC

2.2 Power calculation of Main Path


Typical launch power of SC1/SC2: 0 ~ -4dBm

Sensitivity of SC1/SC2: -48dBm

Receiving Power＝Launch Power - Loss of Fiber – 2xIL of FIU.

Power Calculation of OSC

TM RMSC1/2SC1 SC1/2SC1

F

I

U

F

I

URM TM

-2dBm

40km(12dB)

IL:1.5dB

-3.5dBm -15.5dBm -17dBm

IL:1.5dB


Station A Station B

40km(12dB)

The distance between station A and station B: 40km, line attenuation: 12dB.

The same board configuration of station A and station B :

Transmitting end: OBU101.

Receiving end: OAU101.

OTM OTM

Network topology

Power Calculation of Main Path - OTM


To station B

② ③ ④

OTU

M40

M40 OBU101

F

I

U

① ⑤

① Suppose typical launch power of OTU: -2dBm.

② Min. insertion loss of VOA : 2dB.

③ IL of M40: 6.5dB.

④ OBU101 nominal individual channel input/output Power-20/0dBm, typical gain: 20 dB.

⑤ IL of FIU:1dB.

VOA

Signal flow and related indices at the transmitting side of station A



② ③ ④

OTUM40

M40

F

I

U

①

To station B

Typical optical power of the reference points at the transmitting side

of station A – Single Channel

-2dBm -20dBm 0dBm -1dBm


OBU101


② ③ ④

M40M40

F

I

U

①

Ptotal (dBm)＝Psigle (dBm) + 10lgN (dB)

OTU

OTU

-2dBm -20+10lgN 0+10lgN -1+10lgN

To station B

Typical optical power of the reference points at the transmitting side

of station A – Multiplex Channels


OBU101


Station A Station B

The launched optical power of station A : -1+10lgN(dBm).

Attenuation of the line fiber: 12dB.

The receiving optical power of station B: -13+10lgN(dBm).

OTM OTM40km(12dB)

-1+10lgN -13+10lgN

Power Calculation of Main Path - OTM Network topology and the line optical power


① IL of FIU:1dB.

② Min. IL of VOA : 2dB.

③ OAU101 nominal individual channel input/output Power -16/4dBm, typical gain: 20 dB.

④ IL of D40: 6.5dB.

⑤ Typical receiving optical power of OTU: -16dBm (APD), -9dBm (PIN).

① ②

M40D40

F

I

U

③ ④ ⑤

M40D40

OTU

OTU

Fixed attenuator

-13+10lgN

Signal flow and related indices at the receiving side of station B


From station A

OAU101


If input optical power of OAU is lower than the nominal power, VOA should be removed.

④Psingle＝Ptotal - 10lgN - IL of D40.

① ②

From station A

M40D40OPU03

F

I

U

③ ④

M40D40

OTU

OTU

Typical optical power of the reference points at the receiving side

of station B

-13+10lgN -16+10lgN 4+10lgN -2.5dBm


OAU101


Power Calculation of Main Path - OLA

Station A Station C

OLAOTM OTM

Station B

40km(12dB)

OBU101 boards are used at the transmitting side of station A & C.

OAU101 boards are used in station B.

C

B

B DCM-B

Network topology

60km(18dB)

-1+10lgN -13+10lgN

-1+10lgN-19+10lgN

C DCM-C


OAU101

PA BAFrom station A

F

I

U

F

I

U

① ②④

③ ⑤ ⑥DCM(B)

Typical optical power of the reference points from station A to station C

③⑤ OAU101 nominal individual channel input/output power: -16/+4dBm, gain range: 20~31dB.

④ IL of DCM(B): 5dB. ① ⑥ IL of FIU: 1 dB.

Actual gain of OAU101 is 20dB.

-13+10lgN -16+10lgN +4+10lgN +3+10lgN

Power Calculation of Main Path - OLA

To station C


Please calculate the optical power of each reference point①② from station C to station A.

F

I

U

F

I

U①②

OAU101

BA

DCM(C)

PA

Is it necessary to put VOA before OAU101?

What is the actual gain of OAU101?

-19+10lgN

Questions

From station C

To station A


Station A Station C

FOADMOTM OTM

Station B

40km(12dB)


OAU101 and OBU101 are used at the station B.

Two MR2 boards are used in station B.

B

B DCM-B

Network topology

80km(24dB)

-1+10lgN -13+10lgN

Power Calculation of Main Path - FOADM


③⑤ OAU101 nominal individual channel input/output Power -16/+4dBm,

gain range: 20~31dB.

④ IL of DCM(B): 5dB. ①⑩ IL of FIU: 1dB. ⑥⑧ IL of MR2: 1dB.

⑨ OBU101 nominal individual channel input/output Power -20/0dBm.

① ② ③④

⑤ ⑥ ⑦ ⑧ ⑨ ⑩

OAU101

PA BA

F

I

U

F

I

U

DCM(B)

MR2MR2

OTU

OBU101

Typical optical power of the reference points from station A to station C

OTU

OTU

OTU

-13+10lgN

Power Calculation of Main Path - FOADM

From station A

To station C


①

②

③④

⑤ ⑥ ⑦ ⑧ ⑨ ⑩

OAU101

PA BA

F

I

U

F

I

U

DCM(B)

MR2MR2

OTU

VOA

OBU101

OTU

OTU

OTU

-13+10lgN

-16+10lgN +4+10lgN -20+10lgN 0+10lgN

-1+10lgN

Power Calculation of Main Path - FOADM Typical optical power of the reference points from station A to C

From station A

To station C


Station A Station C

ROADMOTM OTM

Station B

40km(12dB)


OAU101 and OBU101 are used at the station B.

Two ROAM boards are used in station B.

B

B DCM-B

Network topology

80km(24dB)

-1+10lgN -13+10lgN

Power Calculation of Main Path - ROADM


③⑤ OAU101 nominal individual channel input/output Power -16/+4dBm, gain range:20~31dB.

④ IL of DCM(B): 5dB. ①⑨ IL of FIU: 1dB. ⑩ IL of D40: 6.5dB.

⑥⑦ IL of ROAM: Mx-OUT: 9dB, IN-DM:7dB, EXPI-OUT:14dB, IN-EXPO: 3dB.

⑧ OBU101 nominal individual channel input/output Power -20/0dBm.

① ② ③④

⑤ ⑥ ⑦ ⑧ ⑨

OAU101

PA BA

F

I

U

F

I

U

DCM(B)

ROAM

OTU

OBU101

Typical optical power of the reference points from station A to station COTU

OTU

OTU

-13+10lgN

Power Calculation of Main Path–ROADM 1

From station A To

station C

ROAM

D40 ⑩


①

②

③④

⑤ ⑥ ⑦

OAU101

PAF

I

U

F

I

U

DCM(B)

OBU101

-13+10lgN

-16+10lgN +4+10lgN

-3+10lgN

0+10lgN

-1+10lgN

Typical optical power of the reference points from station A to C

From station A

To station C

ROAM

OTU

OTU

OTU

OTU

ROAM

D40 ⑩

BA

⑧ ⑨

+1+10lgN

-20+10lgN



③⑤ OAU101 nominal individual channel input/output Power -16/+4dBm, gain range:20~31dB.

④ IL of DCM(B): 5dB. ①⑨ IL of FIU: 1dB. ⑩ IL of D40: 6dB, IL of M40V: 8dB.

⑥ IL of WSD9: 8dB(IN-DMx,IN-EXPO).

⑦ IL of RMU9: 8.5dB(EXPI-OUT), 12.5dB (AMx-TOA), 1.5 dB (ROA-OUT)

⑧ OBU101 nominal individual channel input/output Power -20/0dBm.

① ② ③④

⑤ ⑥ ⑦ ⑧ ⑨

OAU101

PA BA

F

I

U

F

I

U

DCM(B)

WSD9

OTU

OBU101

Typical optical power of the reference points from station A to COTU-13+10lgN


From station A

To station C

RMU9

D40 ⑩

M40V

OBU101

OTUOTU


①

②

③④

⑤ ⑥ ⑦

OAU101

PAF

I

U

F

I

U

DCM(B)

OBU101

-13+10lgN

Typical optical power of the reference points from station A to C

From station A

To station C

BA

⑧ ⑨


WSD9

OTU

OTU

RMU9

D40 ⑩

-16+10lgN +4+10lgN -20+10lgN

0+10lgN

-1+10lgNM40V

OBU101

OTUOTU


Please calculate the optical power of each reference point (40 channels)

Questions

① ② ③

⑥F

I

U

F

I

U

OBU101

-13+10lgN

From station A

To station C

⑧

⑨

WSMD4

OTU

OTU

OTU

OTU

D40⑤

M40

OAU101 WSMD4

④

-2

⑦

⑦ Optical power of adding wavelength.

⑧ Optical power of passing through.

⑩


Summary OSC Power Calculation

OTM Power Calculation

OLA Power Calculation

FOADM Power Calculation

ROADM(ROAM) Power Calculation

ROADM(WSD9+RMU9) Power Calculation

ROADM(WSMD4+WSMD4) Power Calculation

Thank youwww.huawei.com

7 - otc107201 optix osn 380068008800 optical power calculation issue 1

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