This section describes the commissioning procedure for the WSMD4 board. In this section, the networking diagram for two-dimensional grooming is used for illustration purposes. The network providing multi-dimensional grooming can be considered as multiple networks providing two-dimensional grooming.
Figure 5-34 Fiber connections of ROADM station E (networking with WSMD4+WSMD4)
F
DM1 AM1 AM1 DM1
OBU1 OAU1
VOA Fixed optical attenuator ODF side
NOTE
l In this diagram, the AM2/DM2 and AM3/DM3 optical ports for the WSMD4 board are not shown.
The two pairs of ports are used for signal grooming in other direction.
l The single-wavelength signals are transmitted directly to the AMn optical port by the OTU board.
Procedure
Step 1 Check the fiber connection for each board according to the fiber connection diagram. The optical fiber for the input port Rx on the OTU needs to be loosely inserted.
Step 2 The line attenuation test is the same as that for the OLA station. See Step 1 in 5.12.3 Commissioning Optical Power of OLA.
Step 3 For the optical power commissioning and insertion loss calculation for the IN and TM ports on the west FIU, see Step 2 and Step 3 in 5.12.3 Commissioning Optical Power of OLA.
Step 4 For optical power commissioning for the SC2, see Step 4 and Step 5 in 5.12.3 Commissioning Optical Power of OLA.
Step 5 For the optical power commissioning and insertion loss calculation for the RM and OUT ports on the east FIU, see Step 6 and Step 7 in 5.12.3 Commissioning Optical Power of OLA.
Step 6 For the optical power commissioning and insertion loss calculation for the IN and TC ports on the west FIU, see Step 8 and Step 9 in 5.12.3 Commissioning Optical Power of OLA.
Step 7 The commissioning method for west-receive OBU1 at the receive end is the same as that for the OLA station. For specific procedures, see Step 12 in 5.12.3 Commissioning Optical Power of OLA.
Step 8 Create a Single-Station Optical Cross-Connection from the west FIU to the east FIU and create one from the east OTU at the transmit end to the east FIU on the U2000.
Step 9 Connect the optical power meter to the fiber of IN ports for the west OTUs individually.
Configure the fixed optical attenuator to ensure that the input optical power for the west OTUs meets the requirements.
NOTE
l If a PIN module is configured as the optical amplifier at the receive end, the OBU and VOA in the dashed frame need to be configured. If the OAU101, OAU103 or OBU103 is configured as the optical amplifier at the receive end, the OBU and VOA are not required.
l If the OBU101 or OBU104 is configured as the optical amplifier at the receive end and an APD module is configured on the WDM side of the OTU at the receive end, the OBU and VOA are not required.
Instead, a 10 dB fixed optical attenuator needs to be configured.
l The previous commissioning method is for the OTU board with a PIN photodiode. For the OTU with APD, a 10 dB fixed attenuator needs to be configured.
l There are two types of optical receive modules: PIN and APD. The specific module type can be identified by the bar code information pasted on the front panel. The APD had a corresponding APD warning identifier on the panel of the board.
Step 10 Test the optical power of the IN port on the OTU. After ensuring that the optical power meets the requirements, tightly insert the fiber into the input port on the WDM side of the OTU.
Step 11 Test the optical power of the IN and DMn ports for the west WSMD4 with an optical power meter. Test the output optical power for the D40.
Step 12 Calculate the drop insertion loss from the IN port to the DMn ports for the west WSMD4, and calculate the insertion loss for the D40. The insertion loss for the D40 should be equal to or less than 6.5 dB.
NOTE
l For the WSMD4 board, Insertion Loss = Insertion Loss when the inside attenuation is zero + Attenuation value of the internal VOA of the board.
l When the attenuation of the inside VOA is zero, see the Product Description for information about the insertion loss for the WSMD4 board.
Step 13 Adjust the optical power of the add wavelengths and pass-through wavelengths for the WSMD4.
Method 2 is recommended during deployment commissioning.
1. Method 1: Select Automatic related to the optical cross-connection mode on the U2000.
The WSMD4 automatically adjusts the optical power for the add wavelength of the east OTU and the west pass-through wavelength. This ensures that the average input power of pass-through wavelengths for the IN port on the east OAU1 at the transmit end is equal to the typical input power of a single wavelength.
NOTE
After the optical power is automatically adjusted, query the actual optical power at the IN optical port on the OAU1. If the actual power differs slightly from the power required, use method 2 to fine-tune the power.
2. Method 2: Select Manual related to the optical cross-connection mode on the U2000.
Manually adjust the attenuation value for each VOA inside the WSMD4 board. This ensures that the average input power of the IN port for the east OAU1 at the transmit end is equal to the typical input power of a single wavelength.
Step 14 Test the output optical power of the AMn and OUT ports for the east WSMD4 by using an optical spectrum analyzer.
Step 15 Calculate the add insertion loss and the pass-through loss from the AMn port to the OUT port for the east WSMD4.
Step 16 Test the single wavelength optical power of the IN port and single wavelength optical power of each output wavelength for the OUT port of the east OAU1 by using an optical spectrum analyzer.
Step 17 Calculate the gain of each wavelength for the OAU1. The gain flatness for each wavelength should be less than 2 dB.
Step 18 Query the input and output optical power of the multiplexed signal for the OAU1 by using the U2000. The difference between the values on the U2000 and the test values should be less than 2 dB.
Step 19 For the optical power commissioning of insertion loss calculation for the RC and the OUT ports of the east FIU, see Step 13 and Step 14 in 5.12.3 Commissioning Optical Power of OLA.
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5.12.12 Commissioning Optical Power of ROADM (WSMD2 +WSMD2)
This section describes how to commission the optical power for a west-to-east signal flow in the ROADM station in the WSMD2+WSMD2 mode.
Prerequisite
The fiber connections must be correct.
To make the OTU emit light normally, all channels must be accessed with services or must be forced to emit light.
Tools, Equipment, and Materials
Optical spectrum analyzer, Optical power meter, Fiber adapter, Fiber, Signal analyzer (selected according to the actual service type), such as SDH/SONET analyzer, Fixed optical attenuator, Variable optical attenuator, U2000
Test Connection Diagram
Figure 5-35 Fiber connections of ROADM station E (networking with WSMD2+WSMD2)
F
Step 1 Check if the fiber connection between boards is correct based on the fiber connection diagram, and check that the fiber on each board is well inserted. If not, immediately correct the error.
Step 2 Test the optical power of the west FIU and the SC2. See step 1 to step 9 in 5.12.3 Commissioning Optical Power of OLA.
Step 3 Perform the commissioning on the west OAU. See step 10 to step 12 in5.12.3 Commissioning Optical Power of OLA.
Step 4 Create optical connections on a per-NE basis from the west FIU. Create optical cross-connections on a per-NE basis from the east OTU at the transmit end to the east FIU on the U2000.
Step 5 Measure the single-wavelength input optical power at the IN port and the single-wavelength output optical power at the DM and EXPO ports on the west WSMD2. Calculate the insertion loss of the wavelength dropped from the IN port to the DM port and the insertion loss of the wavelength that traverses from the IN port to the DM port on the WSMD2.
Drop insertion loss = Input optical power for a single drop wavelength at the IN port on the WSMD2 – Output optical power for a single drop wavelength at the DM port on the WSMD2 Pass-through loss = Input optical power for a single pass-through wavelength at the IN port on the WSMD2 – Output optical power for a single pass-through wavelength at the EXPO port on the WSMD2
NOTE
For information about the parameters of optical power and insertion loss, see the Product Description.
Step 6 Use a spectrum analyzer to measure the single-wavelength input optical power at the IN port and the single-wavelength output optical power at the Dn port on the west D40. Calculate the insertion loss of the D40.
Single-wavelength insertion loss of the D40 = Single-wavelength input optical power at the IN port on the D40 – Single-wavelength output optical power at the Dn port on the D40
Step 7 Test the input optical power from the IN port on all the west OTU boards. Replace or remove the fixed optical attenuator to ensure that the input optical power from the IN port on the OTU boards is within the optimal range: from (sensitivity + 3) dBm to (overload point – 5) dBm.
Step 8 Test the client-side transmitting optical power of the west OTU board. There are two possible situations, described as follows:
l If the client equipment is also newly installed, connect the OTU boards to the client equipment for test.
l If the client equipment is not connected, use a fiber to connect the client-side TX port on the west OTU board to the client-side RX port on the east OTU board of station C by using a fixed optical attenuator on the ODF.
NOTE
The client side of the OTU board is connected to the client equipment normally after commissioning. The interconnection of the OTU boards exists for the testing of 24-hour bit errors in serial after an analyzer is connected to station A after commissioning.
Step 9 Use a spectrum analyzer to measure the input optical power of the east OBU. On the U2000, set the attenuation of the VOA which corresponds to each wavelength on the east WSMD4. Set the attenuation to ensure that the input optical power for each pass-through wavelength of the OBU conforms to the typical input power of a single wavelength.
NOTE
The single-wavelength input optical power of the OBU permits a tolerance of ±1 dB. For the technical specifications for the OBU board, see the Product Description.
Step 10 Measure the optical power at the RX port on the east OTU board. Add, replace or remove a fixed optical attenuator to ensure that the optical power at this RX port is within the optimal range:
from (sensitivity + 3) dBm to (overload – 5) dBm.
NOTE
Optical ports on the OTU board used in this network scenario are the S-64.2b ports. For client-side specifications for other types of OTUs, see the Product Description.
Step 11 Measure the output optical power at the OUT port on the east OTU board. This value should be in the range from 0 dBm to –5 dBm. This value is usually about –2 dBm.
Step 12 Use a spectrum analyzer to measure the received single-wavelength optical power at the Mn port and the single-wavelength output optical power at the OUT port on the east M40. Calculate the insertion loss of the M40.
NOTE
For the parameters for optical power and insertion loss, see the Product Description.
Step 13 Use a spectrum analyzer to measure the input optical power at the IN port on the east OBU. On the U2000, set the attenuation of the VOA which corresponds to each wavelength on the east WSMD2. Set the attenuation to ensure that the input optical power for each add wavelength of the OBU conforms to the typical input power of a single wavelength.
NOTE
The single-wavelength input optical power of the OBU permits a tolerance of ±1 dB. For the technical specifications of the OBU board, see Product Description.
Step 14 Measure the wavelength input optical power at the AM and EXPI ports and the single-wavelength output optical power at the OUT port on the east WSMD2. Calculate the insertion loss of the wavelength added from the AM port to the OUT port, and the insertion loss of the wavelength that traverses from the AM port to OUT port on the WSMD2.
Add insertion loss = Input optical power of a single add wavelength at the AM port on the WSMD2 – Output optical power of a single add wavelength at the OUT port on the WSMD2 Pass-through loss = Input optical power for a single pass-through wavelength at the EXPI port on the WSMD2 – Output optical power for a single pass-through wavelength at the OUT port on the WSMD2
NOTE
For the parameters for optical power and insertion loss, see the Product Description. The insertion loss measured in the previous steps includes the VOA attenuation, which differs from the insertion loss measured when the VOA attenuation is set to 0.
Step 15 Perform the commissioning on the east OBU. See 5.12.2 Commissioning Transmit-End Optical Power of the OTM Station.
Step 16 Perform the commissioning on the east FIU. See 5.12.2 Commissioning Transmit-End Optical Power of the OTM Station.
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5.12.13 Commissioning Optical Power of ROADM (WSMD9 +WSMD9)
This section describes how to commission the optical power for a west-to-east signal flow in the ROADM station in the WSMD9+WSMD9 mode.
Prerequisite
The fiber connection and NE commissioning must be complete.
To make the OTU emit light normally, all channels must be accessed with services or must be forced to emit light.
Tools, Equipment, and Materials
Optical spectrum analyzer, Optical power meter, Fiber adapter, Fiber, Signal analyzer (selected according to the actual service type), such as SDH/SONET analyzer, Fixed optical attenuator, Variable optical attenuator, U2000