Optix Wdm Testing Issue1.3
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Transcript of 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
Test configuration is the same as the above
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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
Test configuration is the same as the above
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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