Principle for the MCA board to implement optical spectrum scanning


The MON port of a monitored board outputs weak optical power through an optical splitter. After being connected to the MON port of the board, the MCA board performs appropriate compensation so that the MON port output power of the monitored board is close to the actual optical power output by the OUT port of the monitored board.

Other related questions:
Wavelength scanning results of MCA boards on BWS 1600G
Generally, the SNR AFEC is around 15. If center wavelength deviation is detected, an alarm is generated.

Optical signal indicators detected by the MCA board
Question: What are the optical signal indicators that can be detected by the MCA board? Analysis: None Root cause: None Answer: Optical power, center wavelength, OSNR, and number of channels.

Function comparison of optical spectrum analyzer units MCA and WMU on OSN 6800
1. MCA boards are classified into MCA4 and MCA8, which provide four and eight ports respectively. An MCA board is mainly used to detect channel optical power, center wavelengths, optical signal-to-noise ratio (OSNR), and the number of wavelengths on an optical path. Similar to an optical spectrum analyzer, an MCA board reports the detected information to the system control board for fault diagnosis and monitoring. In addition, an MCA board can be used together with other boards to implement the automatic power equilibrium (APE) function. 2. The core function of a WMU board is to work with the system control board to lock wavelengths and monitor the wavelength offset of the transmit-end OTU board. The monitoring information is sent to the system control board by email. Then the system control board determines whether to adjust the wavelengths based on the wavelength configuration table. If wavelength adjustment is required, the system control board sends the adjustment information to the OTU board and then adjusts the wavelength offset. 3. An MCA board can monitor both the transmit end and receive end. 4. A WMU board can be configured only at the transmit end because it must work with the system control board at the local site to adjust the wavelength offset of the OTU board at the local site. 5. An MCA board mainly facilitates maintenance and a WMU board is used for function implementation. If an OTU board with 100 GHz channel spacing is used to implement a C-band 80-wavelength system, a WMU board needs to be configured to lock the operating wavelength of the OTU board. This is because the OTU board with 100 GHz channel spacing cannot satisfy the stability requirements of an 80-wavelength system, but the WMU board can help stabilize the wavelength performance.

Optical signal performance counters detected by an MCA board
An MCA board can detect the following performance counters and report them to the system control board (the following information can be displayed on the U2000): Single-wavelength optical power Center wavelength Number of wavelengths on an optical path Using the OD wavelength monitoring and management license and the OD function, the MCA board can be used to detect the OSNR of signals whose rates are 10 Gbit/s, 40 Gbit/s, 100 Gbit/s, and 200 Gbit/s. When no OD wavelength monitoring and management license is configured and all the rates of the wavelength signals are less than or equal to 10 Gbit/s, OSNR detection is supported. If the system has signals whose rates are greater than 10 Gbit/s, there are the following restrictions: OSNR monitoring is not supported if adjacent channels have 50 GHz channel spacing. OSNR detection is supported only for signals whose rates are less than or equal to 10 Gbit/s if the channel spacing is 100 GHz.

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