Dear friend!
You need to enable the monitoring function of the OPM board if the optical fiber is correctly connected and optical signals are input to the OPM board. Please refer to the following information:
1. In the NE Explorer, select the MCA board and choose Configuration > WDM Interface from the Function Tree.
2. Click By Board/Port(Channel) and select Monitor Wavelength from the drop-down list.
3. Select the wavelength to be monitored on the board and set Wavelength Monitor Status to Monitor. Click Apply.

Test method:
1. Select the board that is enabled for wavelength monitoring and choose Configuration > Laser Spectrum Analysis from the Function Tree.
2. Set Port Number and select the port to be analyzed.
3. In Compensation Power(dBm), enter the optical power compensation value. Then, click Refresh.

The default value is 20 dBm and the range is -10 dBm to 30 dBm.
4. Click Query to start the spectrum analysis. The Spectrum Data, Spectrum Waveform, and Profile are displayed in the user interface.
Thanks!