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HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
Huawei Confidential
Security Level: internal use only2013/7/29
Jiang Luyong 17748
WDM SystemCommissioning
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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.
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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 1600GDebugging and Commissioning Guide.
The emphases and difficulty of this
course is the optical power
Commissioning.
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References
OptiX BWS 1600G Backbone
DWDM Optical Transmission
System Commissioning Guide
OptiX BWS 1600G Backbone
DWDM Optical Transmission
System Configuration Guide
OptiX BWS 1600G Debugging
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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
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Contents
Preparation for Commission
Commission Requirement andMethod
System Commission
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Contents
Preparation for Commission
Document Preparation Tools Preparation
Commission Precaution
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Preparation for Commission
Document Preparation
Engineering Design Documents, include networking diagram, amplifier
configuration diagram, card layout of a cabinet, wavelength distribution
diagram, Optical fiber connecting diagram of a cabinet;
Engineering Survey Report: height of antistatic floor and cabling rack inthe DWDM equipment room, mounting locations of the equipment in the
equipment room, locations of the ODF cabinets on the line side and
service side, and routing of fibers as well.
Contract information: know the engineering division, the requirement ofequipment function and feature, especially the requirement of
commission.
Testing record table: according to the engineering, prepare the testing
record table before commission.
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Preparation for Commission
Tools Preparation Instrument:
Optical spectrum analyzer, optical power meter, Tesgine2500;
SDH analyzer, SmartBits meter, and other meter with special service;
Accessories:
Fiber jumper used for debugging (two separately for FC/PC-FC/PC, LC/PC-
LC/PC and LC/PC-FC/PC);
fixed attenuator (3dB, 5dB, 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.
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Preparation for Commission Commissioning Precautions
Before commissioning, the installation engineer must work out the hardware quality checkreport. 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 andflange) 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).
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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 commissioningprocess?
Answer:
1. The instrument is faulty or is not calibrated.
2. Fibers must be cleaned.
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Summar
y
In this chapter, we have
learned:
Document Preparation
Tools Preparation
Commission Precaution
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Contents
Preparation for Commission
Commission Requirement andMethod
System Commission
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Content
Commission Requirement and
Method Optical amplifier unit
Optical Transponder Unit
Other units
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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.
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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+10lgNmaximum input and output optical power
The one-channel standard input and output optical power 10lgSmaximum 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 20-10lg404dBm 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.
Commission Requirement and Method for Optical
Amplifier Unit
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Commission Requirement and Method for Optical
Amplifier Unit
Board
nameModule
Minimu
m input
optical
power
(dBm)
Maximu
m input
optical
power
(dBm)
Input/Outp
utsingle-
wavelengt
h standard
power
(dBm)
10-
wavelength
Input/Outp
ut single-
wavelengt
h nominal
optical
power
(dBm)
32-
wavelengt
h
Input/Output
single-
wavelength
nominal
optical power
(dBm)
40-
wavelength
Input/Output
single-
wavelength
nominal
optical power
(dBm)
80-
wavelength
Gain
(dB)
Maximum
output
optical
power for
full
waveleng
th (dBm)
E3OAUC01
A/B/C/D
(C band)
/ -32 0 / -15/5 -16/4 -19/1 20-33 20
E3OAUC02
A/B/C/D
(C band)
/ -32 -3 / -18/2 -19/1 -22/-2 20-33 17
E3OAUC03A/B/C/D
(C band)
/ -32 -6 / -21/5 -22/4 -25/1 26-32 20
E3OAUC03
E
(C band)
/ -32 -4 / -19/5 -20/4 -23/1 24-36 20
1.Commission Requirement and Method for Optical amplifier unit
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Board nameModul
e
Minim
um
input
optical
power
(dBm)
Maxim
um
input
optical
power
(dBm)
Input/Out
putsingle-
wavelengt
h
standard
power
(dBm)
10-
wavelength
Input/Out
put
single-
wavelengt
h nominal
optical
power
(dBm)
32-wavelengt
h
Input/Out
put
single-
wavelengt
h nominal
optical
power
(dBm)
40-wavelengt
h
Input/Out
put
single-
wavelengt
h nominal
optical
power
(dBm)
80-wavelengt
h
Gain (dB)
Maximum
output
optical
power for
full
wavelengt
h (dBm)
E3OAUC05
A
(C band)/ -32 0 / -15/8 -16/7 -19/4 23-36 23
E3OBUC03
A/C(C band)/ -24 -3 / -18/5 -19/4 -22/1 20.5-25.5 20
E3OBUC05
A(C band)/ -24 0 -15/8 -16/7 -19/4 20.5-25.5 23
E3OPUC03
C(C band)/ -32 -8 / -23/0 -24/-1 -27/-4 20.5-25.5 15
Notes: here take the E3OAU/OBU/OPU for example, other boards such as E4/C6 and so on
the principle is the same.
Commission Requirement and Method for Optical
amplifier unit 1.Commission Requirement and Method for Optical amplifier unit
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2. 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 endmonitor the receive end and adjust thetransmit 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.
Commission Requirement and Method for Optical
Amplifier Unit
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3. Method of Commissioning One-Channel Optical Power
One-channel input optical power
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.
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
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.
If the E3OAU and the C6OAU has an EVOA, set gainone-channelstandard output optical poweradjusted one-channel average inputoptical power
For the OAU that does not have an EVOA, adjust the VOA of TDC/RDC toenable the one-channel average output optical power to reach the standard.
Commission Requirement and Method for Optical
Amplifier Unit
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3. Method of Commissioning One-Channel Optical Power
Sample E3OAU commissioning The input optical power of the E3OAUC03E ranges from 32 dBm to4 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 is15 dBm, how do you
commission the system? If the value is25 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.
Commission Requirement and Method for Optical
Amplifier Unit
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3. 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 is20 dBm and the output optical power is +4 dBm.
If the one-channel average input optical power before you add a VOA is15 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 power20 dBm, the
gain is4(20)24dB.
If the one-channel average input optical power before you add a VOA is25 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 power25 dBm,
the gain is4(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).
Commission Requirement and Method for Optical
Amplifier Unit
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3. Method of Commissioning One-Channel Optical Power Sample E3OBU commissioning
The input optical power of the E3OBUC03 ranges from 24 dBm to3 dBm, the gainis 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 is14dBm, how do you commission the system?
The OptiX 1600G III model system is a 40x10G system. The calculated one-channel
standard input optical power19 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 power19dBm, andthe tested one-channel average output optical power is +4 dBm.
INBA OUT21OBU diagram
VOA
Commission Requirement and Method for Optical
Amplifier Unit
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4. 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 powerone-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 opticalpower 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
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4. Method of Commissioning Total Optical Power
Definition of standard total optical power The standard total optical power refers to the total optical power when you
adjust one channel to reach the standard one-channel optical power.
Calculation of total standard optical power
Total standard optical power = one-channel standard optical
power++10lgn+offset
The definition of the one-channel standard optical power is the same as
what is described in previous pages
n is the number of wavelengths contained in the signal that accesses an
amplifier
Offset is the optical power compensation that is added for noise impact
when you use the optical power meter to commission a system. The
smaller the number of wavelengths, the lower is OSNR, the larger the
compensation value.
Commission Requirement and Method for Optical
Amplifier Unit
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4. 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-channeloptical 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 offset10lg (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.
Commission Requirement and Method for Optical
Amplifier Unit
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4. 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
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Amplifier Unit
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4. Method of Commissioning Total Optical Power
Sample E3OAU commissioning The input optical power of the E3OAUC03E ranges from32 to4 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 is9 dBm, how
do you commission the system? If the value is20 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.
Commission Requirement and Method for Optical
Amplifier Unit
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4. Method of Commissioning Total Optical Power
Sample E3OAU commissioning
The OptiX 1600G III model system is a 40x10G system. The calculated one-
channel standard input optical power is20 dBm and +4 dBm. The empiric
value of offset is approximately 1 dB and 1.5 dB. The total standard input and
output optical power that are calculated are 13 dBm and 11.5 dBm. The
value can be more correct if the OSNR calculation tool is used.
If the one-channel average input optical power before you add a VOA is9 dBm,
you can adjust the VOA to enable the total input optical power to reach the
standard value13 dBm.
the one-channel average optical power is calculated as the one-channel
standard optical power20 dBm. you can set gain = 4 (20) = 24 dB, and then query the total output optical
power and the value is approximately 11.5 dBm.
Commission Requirement and Method for Optical
Amplifier Unit
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4. Method of Commissioning Total Optical Power
If the total input optical power before you add a VOA is20 dBm,
you can remove the VOA to enable the maximum input optical power to be
20 dBm.
the one-channel average input optical power =20110lg4=27 dBm.
you can set gain = 4(27) = 31 dB. After you set the gain, the output optical
power is 11.5 dBm.
Limitation of this commissioning method
The offset value is incorrect. As a result, commissioning may be incorrect.
You can estimate the offset compensation value by means of OSNR and the
OSNR can be estimated by using the OSNR calculation tool.
If the one-channel optical power deviation is large, the estimated offset may be
largely different.
Commission Requirement and Method for Optical
Amplifier Unit
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5. Improved Commissioning Method of Total Optical Power
Commissioning method by adjusting optical power by attenuation
A. As the OSNR of the input optical power of the optical amplifier unit at
the OTM at the initial end is small, you can directly use it to calculate the
total standard input optical power = one-channel standard optical power
+ 10lgN, where N is the number of wavelengths.
B. Adjust the total standard input optical power of the optical amplifierunit in the downstream direction = queried total optical power of the
optical amplifier unit in the upstream direction(one-channel standard
optical power of the optical amplifier unit in the upstream directionone-
channel standard input optical power of the optical amplifier unit in the
downstream direction). Adjust the VOA to enable the total input opticalpower in the downstream direction to be the total standard input optical
power. If you fail to adjust the value to the standard value, remove the
VOA to enable the input optical power to remain the maximum value.
Then, you can query the total input optical power in the downstream
direction.
Commission Requirement and Method for Optical
Amplifier Unit
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5. Improved Commissioning Method of Total Optical Power
Commissioning method by adjusting optical power by attenuation
C. The adjusted one-channel input optical power of the optical
amplifier unit in the downstream direction = one-channel standard
output optical power in the upstream direction(queried total output
optical power of the optical amplifier unit in the upstream direction
queried total input optical power of the optical amplifier unit in thedownstream direction)
D. Set gain for the OAU in the downstream direction = one-channel
standard output optical power of the optical amplifier unit in the
downstream directionadjusted one-channel input optical power of
the optical amplifier unit in the downstream direction = (one-channelstandard output optical power of the optical amplifier unit in the
downstream directionone-channel standard optical power in the
upstream direction) + (queried total output optical power of the
optical amplifier unit in the upstreamqueried total input optical
power of the optical amplifier unit in the downstream direction).
Commission Requirement and Method for Optical
Amplifier Unit
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5. 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 is9 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.
Commission Requirement and Method for Optical
Amplifier Unit
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5. Improved Commissioning Method of Total Optical Power
If the total input optical power before you add a VOA is20 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.
Commission Requirement and Method for Optical
Amplifier Unit
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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
Commission Requirement and Method for Optical
Amplifier Unit
Commission Requirement and Method for Optical
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6. Commissioning Requirement on Optical Power of Raman Amplifier
Requirements
The switch gain of a Raman amplifier10 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
Commission Requirement and Method for Optical
Amplifier Unit
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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.
Commission Requirement and Method for Optical
Amplifier Unit
C i i R i t d M th d f O ti l
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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 toverify 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.
Commission Requirement and Method for Optical
Amplifier Unit
C i i R i t d M th d f O ti l
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6. Commissioning Requirement and Method on Optical Power of RamanAmplifier
Method of commissioning optical power of Raman amplifier gain
flatness
1529.58nm
-2.5
-2
-1.5
-1
-0.5
0
0. 5
1
1525 1530 1535 1540 1545 1550 1555 1560 1565
ASE
1
2
210.7dB
Zero at 1529.58nm
Gain spectrum
ASE spectrum
Commission Requirement and Method for Optical
Amplifier Unit
C i i R i t d M th d f O ti l
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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.
Commission Requirement and Method for Optical
Amplifier Unit
Commission Requirement and Method for
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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 0.1dB (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.
Commission Requirement and Method for
Optical Amplifier Unit
C i i R i t d M th d f O ti l
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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).
The Raman amplifier (all amplifier units on release 5.0 NEs) provides the automatic
restart function after the laser is off for five minutes. This function must be disabled for
Raman amplifiers and HBA high optical power units on the field.
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.
Commission Requirement and Method for Optical
Amplifier Unit
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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.
Commission Requirement and Method for Optical
Amplifier Unit
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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 theone-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 unitinput 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?
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Summary In this chapter, we have learned:
The commission requirement of OA
Three commission methods for OA
Example for OA Commission
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Contents
Commission Requirement and
Method
Optical amplifier unit
Optical Transponder Unit
Other units
C i i R i t d M th d f OTU
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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
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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 withFEC/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.
Commission Requirement and Method for OTU
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1. Commissioning Requirement for OTU
Commissioning requirements on special OTU
There is no difference in the commissioning requirements and methods for10G 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 biterrors. 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.
Commission Requirement and Method for OTU
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Commission Requirement and Method for OTU
OTU
2.5GPIN:7dB
7CLIENT
OTU
10GPIN:7dB
7CLIENT
OTU2.5GAPD:15dB15CLIENT
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.
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Commission Requirement and Method for OTUIN TX
D
4
0
OTU
APD:15dB
15 CLIENT
OTUPIN:7dB
CLIENT
OTUAPD:15dB
15
OTU
PIN:7dB
OTU
OTU
RX OUT
IN OUT
M
4
0
O
A
U
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.
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Commission Requirement and Method for OTU
OTU in BWS 1600G
Receiver
sensitivity
(dBm)
Receiver
overload
(dBm)
Output
optical
power(dB
m)
The scope of
Input optical
power (dBm)
LWC
LWC
1
DWDM SideORP:-18 ORP:0 -10~0 -12~-6
ORA:-28 ORA:-9 -10~0 -22~-16
Client
side
I-16 ORP:-18 ORP:-3 -10~-3 -14~-8
S-16.1 ORP:-18 ORP:0 -5~0 -12~-6
L-16.1 ORA:-27 ORA:-9 -2~3 -22~-16
L-16.2 ORA:-28 ORA:-9 -2~3 -22~-16
LWFLWF
S
DWDM
Side
100GHz ORP:-14 ORP:0 -5~0 -10~-6
50GHz ORP:-14 ORP:-1 -5~0 -10~-6
CRZ ORP:-16 ORP:0 -5~0 -12~-6
Client
side
I-64.1 ORP:-11 ORP:0 -6~-1 -8~-4
I-64.2 ORP:-14 ORP:0 -5~-1 -10~-6
S-64.2b ORP:-14 ORP:0 -1~2 -10~-6
S-64.2a ORA:-18 ORA:-8 -1~2 -15~-11
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Contents
Commission Requirement and
Method
Optical amplifier unit
Optical Transponder Unit
Other units
Commission Requirement and Method for Other
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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
-70dBm 1500nm1520nm -48dBm -3dBm
Commission Requirement and Method for Other
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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: INDROP
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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.
Commission Requirement and Method for Other
Boards
C i i R i t d M th d f Oth
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Commission Requirement and Method for Other
Boards 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.
F
I
U
F
I
U
A B
Ring flange ofline-side ODF, in
between is aoptical fiber/cable
OUT INRC
TC
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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 thereceived 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?
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Summar
y
In this chapter ,we have
learned:
Commission Requirement andMethod for Optical amplifier
unit, Optical Transponder Unit,
and Other units
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Contents
Preparation for Commission
Commission Requirement andMethod
System Commission
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Contents
System Commission
OTM Commission OLA Commission
OADM Commission
ROADM Commission
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Typical Network and application of WDM product
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System Commission
F
I
U
O
B
U
O
A
U
SC1/
TC1
MCAMON
D
C
M
TM
RM
RM
TM
OUT
IN
RC
TC
IN
TDC
RDC
OUT
MON
D
4
0
D01
D40
IN
M
4
0
M01
M40
OUT
LWF
MON
M02LWF
LWF
OUTRx
LWF
D02LWF
LWF
INTx
5dB
Out line
ODF
Client
ODF
OUTIN
VOA
FOA
ODF
Fiber
1.OTM Commission
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OTM Commission
1. Optical power commission for OTM
The output optical power commission for OTM
2dBm 9dBm 2dBm 6dB -19dBm +4dBm
1dB +3dBm
LWF M40 OBU FIUSDH
RX OUT M01 OUT IN OUT RC RM OUT
1 1 2 3 3 4 5 6 6 6
SC16
LWF M40 OBU FIUSDH
RX OUT M01 OUT IN OUT RC RM OUT
1 1 2 3 3 4 5 6 6 6
SC16
2dBm 9dBm 2dBm 6dB -19dBm +4dBm
1dB +3dBm
Note: Different from the 1600G, the commission for Metro 6100 is dedicated to each
wavelength.
OTM C i i
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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 theoptical 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.
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OTM Commission
1.Optical power commission for OTM
The input optical power commission for OTM
2.5dBm 2dBm 9dBm 6dB +4dBm 20dBm -16dBm 1dB15dBm
2.5dBm 2dBm 9dBm 6dB +4dBm -24dBm 1dB23dBm
LWF D40 OAU FIUSDH
TX IN D01 IN OUT I
6 6 5 4 4 3
2 1 1 1
SC11
DCM
LWF D40 OAU FIUSDH
TX IN D01 IN OUT I
6 6 5 4 4 3
2 1 1 1
SC1 1
DCM
OTM Commission
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OTM Commission
Step 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 issmaller 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 receivedoptical 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
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OTM Commission
F
I
U
O
B
U
O
A
U
TC2
TM
RM
RM2
TM2
IN
RC
TCIN
TDC
RDC
OUT
MON
D01
D40
IN
D
4
0
M01
M40
OUT
LWF
MON
M02LWF
LWC
OUTRx
LWF
D02LWF
LWC
INTx
LWF
LWF
LWC
TxIN
LWF
LWF
LWC
RxOUT
D
4
0
O
B
U
OUTINOUT
MON
F
I
U
TM
RM
RC
TC
O
A
U
RDC
MON
TDC
TM1
RM1
IN
15dB
OUTINOUTIN
TC2
RM2
TM2
TM1
RM1
15dB
VOAD
C
M
D
C
M
OUT
OUT
D05
D12 M13 D01M02
D05
D06D06
D12M13M02
D01
IN
D01
M01
M
4
0
M
4
0
FOA
ODF
1. 2OTM in 1600G
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OTM Commission
D
4
0
F
I
U
O
B
U
O
A
U
SC2
TM
RM
RM2
TM2
IN
RC
TCIN
TDC
RDC
OUT
MON
D01
D40
IN
M01
M40
OUT
LWF
MON
M02LRF
OUTRx
LWF
D02
INTx
LWF
TxIN
LWF
LRF
RxOUT
D
4
0
O
B
U
OUTINOUT
MON
F
I
U
TM
RM
RC
TC
O
A
U
RDC
MON
TDC
TM1
RM1
IN
15dB
OUTINOUTIN
SC2
RM2
TM2
TM1
RM1
15dB
VOAD
C
M
D
C
M
OUT
OUT
D05
D12 M13 D01M02
D05
D06D06
D12M13M02
D01
IN
D01
M01
M
4
0
M
4
0
FOA
ODF
D02
M02
M40
D40
1. 2OTM in 6100
Questions
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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 asingle wavelength basis. If no spectrum analyzer is available, how to
perform commissioning based on the total optical power?
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Contents
System Commission
OTM Commission
OLA Commission
OADM Commission
ROADM Commission
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OLA Commission
F
I
U
F
I
U
O
B
U
O
A
U
D
C
M
SC2/TC2
OUT
RM RM2
RMRM1TM
TM1 TM
TM2
RC
MON
OUT
IN
IN
MON
IN
RDC
TDC
D
C
M
OUT IN OUT
RDC
TDC
TCRC
TC
INOUT
MON
D05 D09
D01 D03
O
A
U
D12
OLA Commission
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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 Commission
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Step Actions of OLA Optical Power Commissioning(Single Wavelength OpticalPower 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 issmaller 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 theFIU 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 Commission
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Step Actions of OLA Optical Power Commissioning(General Wavelength OpticalPower 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 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 = 24.710lg2
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 FIUinsertion loss and the fiber jumper attenuation are normal.
OLA Commission
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OLA Commission
Step Actions of OLA Optical Power Commissioning(Improved GeneralWavelength Optical Power Commissioning)
1Test the optical power of the line ODF/FIU-IN/FIU-TC/FIU-TM/SC2-RM1. Theattenuation=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(7.324.7)
=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.
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OLA Commission
The commissioned single wavelength input optical power of downstreamOAU = 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
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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
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Contents
System Commission
OTM Commission
OLA Commission
OADM Commission
ROADM Commission
OADM C i i
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OADM Commission
F
I
U
O
B
U
O
A
U
TC2TM
RM
RM2
TM2
OUT
IN
RC
TC
IN
TDC
RDC
OUT
MON
IN
OUT
MON
O
B
UOUT
INOUT
MON
F
I
U
TM
RM
RC
TC
O
B
U
MON
TM1
RM1
OUT
IN
OUTINOUTIN
M
R
2
M
R
2
M
R
2
M
R
2
L
W
X
L
W
X
IN
MI
MO
OUT
IN
MI
MO
MO
MI
IN
OUT
MO
L
W
X
L
W
X
L
W
X
L
W
X
L
W
X
L
W
X
5dB
D
C
M
D
C
M
VOA
FOA
ODF
Fiber
OADM Commission
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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 INMR2MR2
LW
F
LW
F
LW
F
LW
F
LW
F
LW
F
LW
F
LW
F
6 dBm
19dBm
OADM Commission
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Step Actions of OADM Optical Power Commissioning(Single WavelengthOptical 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 theattenuator, 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 thesingle 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 thesignals 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
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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 theoptical power of pass-through wavelengths are comparatively low.
OADM C i i
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OADM Commission
OAU MR2 MR2 OBU
OUT IN MO IN MO MI OUT
MI OUT INMR2MR2
LW
F
LW
F
LW
F
LW
F
LW
F
LW
F
LW
F
LW
F
6 dBm
19dBm
OAU MR2 MR2 OBU
OUT IN MO IN MO MI OUTMI OUT IN
MR2MR2
LW
F
LW
F
LW
F
LW
F
LW
F
LW
F
LW
F
LW
F
6 dBm
12.3dBm
Adjust this VOA
Adjust this VOA
OADM Commission
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Step Actions of OADM Optical Power Commissioning(General Optical PowerCommissioning)
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-sidelaser 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 toshut down the add-wavelength laser and the pass-through wavelength at the local station.
OADM Commission
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Step Actions of OADM Optical Power Commissioning(Improved General Optical PowerCommissioning)
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 opticalpower, 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 ofOBU-IN is -19dBm
Merit To calculate the Offset, you neither need the OSNR nor the spectrum analyzer.
Defec
t
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.
Q ti
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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?
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Contents
System Commission
OTM Commission
OLA Commission
OADM Commission
ROADM Commission
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ROADM Commission
F
I
U
F
I
UTo D
IN
OUT
To F
OUT
IN
Site E
SC2RM1
TM1RM
TM RMTM2
TMRM2
OBU
OUT OUT
OUT INOUT
OUT
TC
RCININ
IN
RC
OBU OAU
OBU
TDCRDC
DWC DWC
INTC OUT
DCM
D40
L
W
F
L
W
F
L
W
F
L
W
F
D40
MO
MI
MI
MO
DROP ADD DROP
West East
M40 M40
ADD
ROADM in OptiX BWS 1600G
ROADM C i i
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ROADM Commission
ROADM in OptiX OSN 6800
F
I
U
F
I
UTo D
IN
OUT
To F
OUT
IN
Site E
SC2RM1
TM1RM
TM RMTM2
TMRM2
OBU1
OUT OUT
OUT INOUT OUT TC
RCININ
INRC
OBU1 OAU1
OBU1
TDCRDC
ROAM ROAM
INTC OUT
DCM
D40
L
Q
M
L
4
G
L
Q
M
L
4
G
D40
EXPO
EXPI
EXPI
EXPO
DMM01
DMM01
West East
ROAM Commission40
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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
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Commission 1. ROADM optical power commissionDWC+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 OBU
OUT IN MO
MI OUT INDWCDWC
L
WF
LW
F
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Step Actions of ROADM Optical Power CommissionDWC+DWC1 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
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1. ROADM optical power commissionROAM+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 INROAMROAM
L
4G
LQ
M
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Step Actions of ROADM Optical Pow