Hello,
Today I would like to share with you transmission failure caused by too high input fiber optical power at the transmitting end.
Incoming fiber optical power is too high, resulting in poor performance of the OTU board
The possible causes of this problem are: the input optical power of the OTU board is too high or too low; the FEC error correction modes of the two connected OTU boards are inconsistent; The power commissioning value does not reach the nominal value, the dispersion compensation is incorrect, non-linear calibration, etc.), which does not meet the activation requirements.
Query the received optical power and FEC configuration of the OTU board, and confirm that they are all normal. Check that the OTU board works normally through the pigtail self-loop. After collecting the optical power of each site, it is found that the single-wave incoming fiber optical power has far exceeded the recommended value. It can be judged that it is caused by the high power of the incoming fiber.
The recommended value of the single-wave incoming fiber optical power of the G.653 link 80-wave system is -7dBm. If the incoming fiber optical power is too high, a non-linear effect FWM will be introduced, resulting in a sharp degradation of system performance.
Too high incoming fiber optical power causes bit errors on the SL64 board
The possible causes of this problem are: the input optical power of the SL64 board is too high or the low end fails to meet the activation requirements.
Query the received optical power of the SL64 board and confirm that it is normal. By checking the BPA interconnected by the local end-to-end SL64, the optical power of each port of the DCU board is normal. Later, Huawei and the line maintenance engineer judged that the incoming fiber optical power was too high, which caused a nonlinear effect in line transmission.
The optical attenuation was added to the BOUT port of the BP board at the sending end, and the error code at the receiving end disappeared.
You are welcome to leave a message and exchange in the comment area. Thank you!
