This LASER_MOD_ERR alarm means: notify the customer to know if the laser matches with board.
(For example: if the STM-1 board uses STM-4 laser module, the board will report the alarm LASER_MOD_ERR). But for this case, before upgrading that there is no alarm,it means that the laser has no problem .Huawei RND do the testing in the lab and confirm that there is no problem after upgrading. Huawei RND check the laser type and confirm the laser type is SCP6F01-H1-BNE. After using the same laser, this issue can recur in the lab. When RND use another type laser and the alarm disappears, it means that only the type of SCP6F01-H1-BNE has this problem. Huawei RND check the software code and find that this is a software bug of version V1R6C02B012, witch cause that the CXL board report "LASER_MOD_ERR",This problem has no any influence on traffic and only the laser of SCP6F01-H1-BNE have this problem.