How to Clear the LASER_HAZARD_WARNING Alarms Reported on Certain OBU and OAU Boa

Symptom

During deployment for a project involving the OptiX BWS 1600G, the NE software of version 5.8.5.41 is upgraded to version 5.8.7.12 by means of package loading so that the NE software supports the 40G single wavelength feature. After the upgrade is complete, the E50BU and E50AU boards at certain stations report the LASER_HAZARD_WARNING alarms.

Cause analysis

The LASER_HAZARD_WARNING alarm (an alarm for the hazard of the output optical power of the laser) indicates that the output optical power of the amplifier board reaches Class 3. Optical power at Class 3 may result in personal injuries (the board can reach Class 3 but may not reach currently). This amplifier board is not configured with the IPA feature. Thus the NE software reports this alarm.

The maximum output optical power of a laser at Class 3 ranges from 21.3 dBm to 27 dBm. The maximum output optical power of a laser at Class 4 ranges as high as 27 dBm.

• The NE software of version 5.8.7.12 and a later version supports the LASER_HAZARD_WARNING alarm.
• The ROP, RPA, RPC, or HBA board reports the LASER_HAZARD_WARNING alarm if the NE software report the LASER_HAZARD_WARNING alarm.
• In the case of an OAU, OBU, or OPU board, check whether the output optical power of the board reaches Class 3. The board reports the alarm if the output optical power of the board reaches Class 3.
  • An E3OAUC05 or OBUC05 board of version 3.31 and a later version supports the LASER_HAZARD_WARNING alarm.
  • An E4OAUC05 or OBUC05 board of version 4.21 and a later version supports the LASER_HAZARD_WARNING alarm.
  • An E5OAUC05 or OBUC05 board of version 5.13 and a later version supports the LASER_HAZARD_WARNING alarm.