optix wdm testing issue1.3

8/10/2019 Optix Wdm Testing Issue1.3

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Optical Network Curriculum

Development Section

ISSUE 1.3

OTC055901 OptiX WDMTesting


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2Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal

Testing Instruments

ANT-20SE SDH/PDH Analyzer

Agilent 37718A SDH/PDH Analyzer

Agilent 86145A Optical Spectrum Analyzer

MS9710B/C Optical Spectrum Analyzer

Agilent 86121A Multi-wavelength meter

OLP-18B Optical Power Meter

MG9638A Tunable Laser Source

OLA-15 Tunable (variable) Attenuator


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ITU-T Recommendations

Comply with the corresponding Recommendations

G.692, G.694,G.709

G.661/662/663/664 G.671,

G.957, G.691


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Test items

Test of a single NE

Test at system level

Network management

Order wire testing


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Reference Points

O A

f N

f 1

S1

S2

T x N

MPI-S

f 2T x 2

T x 1

Sn

M U X

R

MPI-R

S

SD1 R 1

R 2

R n

D E M U X

Rm1

Rm2

Rmn

SD2

SDn R x N

R x 2

R x 1

O A

f N

R 1

R 2

R x N

MPI-R

f 2R x 2

R x 1

D E M U X

S

MPI-S

R

S2

M U X

SD2

SDDn

Rm 2

RmnT x N

T x 2

T x 1

O S C


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Actual reference points in WDM system (1)

M 3 2

D 3 2

TWC

TWC

TWC

RWC

RWC

RWC

S C

A

SCC

OHP

SC1

WBA

WPA M 3 2

D 3 2

TWC

TWC

TWC

RWC

RWC

S C

A SCC

OHP

SC1

WBA

WPA SCC

OHP

SC2

WBA WPA

WPA WBA

S C

A

S C

A

RWC

O T M O L A O T M


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Actual reference points in WDM system (2)

M40

D40

LWF

LWF

LWF

LWF

LWF

LWF

FIU

SCC SC1

OAU

OAU

O T M1

M40

TWD

FIU

SCCSC1

OAU

O T M2

D40

LWF

LWF

LWF

OAU

LWF

LWF

LWF

SCC

SC2FIU

FIU

O L A

FIBER

FIBER

RC

TM

OUT

IN

RM

TC

ININ OUT

OUTOUT

RC

RC

RC

RM

RM

RM

TC

TC

TC

IN

TM

TM

TM

RM2TM1

TM2RM1 RM

TM

RM

TM

OAU

OAU

DCM

DCM DCM

DCM DCM

DCM


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Test items of single NE

Transmitter end:Receiver sensitivity/overload optical power

Mean launched optical power

Central wavelengthSide mode suppression ratio

-20dB spectral width

Jitter transfer function/input jitter tolerance

Receiver end:Mean launched optical power

Receiver sensitivity/Receiving power

Jitter transfer function/input jittertolerance

Test on wavelength conver ter


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Transmitter side Mean launched power

Index Requirement:

Refer to Technical manual

Transmitter

Testconfiguration

Optical spectrumanalyzer/Multi-wavelength meter


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Transmitter side

deviation:2.5G: | 0.16|nm( 20GHz) 10G: | 0.08|nm( 10GHz)

Transmitter Optical spectrum analyzer/Multi-wavelength meter

deviation actual value - nominal value


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Side Mode Suppression Ratio

Index requirement

35dB(ITU-T

Test configuration is the same as the above


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-20dB spectral width

The max. spectral width when themax. peak power decreases by 20dB

Index requirement:

0.2nm 2.5Gb/s

0.3nm 10Gb/s



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Receiver side

Receiver sensi tivity

Note testing error ratio is 10 -12 .

Index Requirement-25dBm(APD/2.5G)

-18dBm(PIN/2.5G)

-14dBm(PIN/10G)

Attenuator

Variable Attenuator

SDH analyzer

Wavelength conversion

unit IN

OUT RX

TX


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Receiver sensitivity

1.I ndex Requirement:

10Gb/s-Level OTUSensitivity: -14dBm

Configuration

2.5Gb/s-Level OTUSensitivity: -18dBm/

-25dBm



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Precautions & Suggestions

Some OTUs has two different sensitivity, which

applicable for different situation

Defined as the minimum receiving optical power

at point R to achieve BER=10 -12


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Overload power

1 APD module: 9dBm2 PIN module 0dBm

Defined as the maximumacceptable received powerat point R for a 10 -12 BER

Be Careful

2.5Gb/s

L W

C

B

A

LWC

Analyzer

variable

attenuator

Attenuator


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Actual receiving power

Read the output optical power of each channel from the optical power

meter.

ODU

1 2

i

n

optical power meter

ODU : Optical DEMUX Unit


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Jitter transfer function/input jitter tolerance

Test steps just like the steps in SDH test

Refer

toG.958

A

Attenuator

Variable Attenuator

SDH analyzer

Wavelength conversion

unit IN

OUT RX

TX


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Test items of a single NE

De-multiplexer:

1.isolation

2.insertion loss

3.central wavelength

Multiplexer:

1.insertion loss

multiplexer/de-multiplexer


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Test of de-multiplexer

Index requirement:Isolation: 25dB

Insertion loss: 7dB(16-channel)10dB 32-channel

Wavelength Deviation: | 0.16|nm

Isolation Insertionloss Central wavelength

optical power meter /spectrum analyzer

De-multiplexere.g. D32/D40


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Test of multiplexer

OT U

Insertion loss of Multiplexer

When M32/M40 consists ofAWG module, the testmethod is similar to thatof D32/D40

Opticalspectrum

analyzer

Insertion loss: 17dB(coupler)10dB AWG


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Test items of a single NE

Test on optical amplifier :Actual input/output optical power andgain

Attention : Input power of OA should be adjusted to proper value ,Be sure to select

the correct external signal source ,and fully consider error of instrument.

For Raman amplifier ,it is ON/OFF gain.

OA Optical spectrum analyzer

in out

test configuration


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Index Requirement:depends on the type of OA

1 Difference between output power and input power is the

gain of optical amplifier

2 OA List:

WBA02,WBA05,WBA06,WPA02,WPA04, etc,

OAU, OBU, OPU, etc.

RPC, RPL, RPA, etc.,

it will has redundancy in actual test


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Optical Amplifier

Attention :Choose optical power meter with wide

input range ,or else you must use attenuator to

measure indirectly.

OSA (optical spectrum analyzer) is recommended.

Keep the consistency between input and output.


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OSC-Optical supervisory channel

1.Central wavelength

2.Output ,input power

3.Receiver sensitivity

Index requirement:Wavelength 1510 10nm

Launched power: -7~0dBm

Receiver sensitivity:-48dBm

OSCOptical spectrumanalyzer/multi-

wavelength meter


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Test of the whole system

1.Individual Channel Output Power at Points MPI-S,S'

2.Maximum channel power difference at points MPI-S,S'

3.Total launched power at points MPI-S ,S'

4.Individual channel input power at points MPI-R,R'

5.Maximum channel power difference at points MPI-R,R'

6.Total receiving power at points MPI-R,R'7.OSNR of individual channel at points MPI-R, R'

M ain channel test

Refer to Technical manual to get index requirement!


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I ndividual Channel Output Power

The reference point MPI-S is after booster amplifier, and S' is after line amplifier

Maximumchannel powerdifference

Total launched

power

TX1

TX2

TXn

OM/OAMPI-S

(S')

Optical spectrum analyzer/multi- wavelength meter

MPI-S, S /


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Total launched power at MPI-S, S'

dBm

32-channel max

20.0

40/80/160-channel max 20.0 23.0(26.0)for special case


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MPI-R R

M PI -R is just before pre-amplifier ,and R' i s just before l ine amplif ier


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OSNR of individual channel

In 32/40//80/160-Wavelength DWDM system:

STM-16 (without FEC) >20dB

STM-16 (with FEC) >16~17dBSTM-64 (without FEC) >26dB

STM-64 (with FEC) >20dB

STM-64 (with EFEC) >17~18dB

I f advanced technology is available, OSNRrequi rement at receiver side could be reduced .


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Bit Error /Jitter Performance of STM-N

1 Be sure to use attenuator

2 Requirement :no bit error within 24 hours


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Summary

During the test:

1 Keep cleanly, If optical power is low, clean the SC/PC&FC/PC

interface ->clean the connector-> replace patch cord->replace

the board or corresponding unit

2 Check the optical power step by step, then locate the faults

Know well about signal f low

Know the procedure of optical power calcul ation


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Order wire Telephone test

1 Addressing call

2 Conference call

3 Tone Quality and

Volume


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NMS function test

1.Fault management

2.Performance management

3.Security management

4.Report management

5.Maintenance management

6.Configurationmanagement


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35Confidential Information of Huawei

optix wdm testing issue1.3

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