Optical Transceiver 1310nm fail to transmiss on G.655 optical fiber
Have you ever encountered the problem that the link cannot be up when the 1310nm optical module is transmitted on G.655 optical fiber? I encountered this kind of problem recently, and now I want to share it with you . Failure symptom Module ： 100G QSFP28 1310nm 80km optical transceiver Switch ： Cisco NCS540 Optical fiber type: G.655, distance 50km Failure symptom: Transmission link cannot go up. Analysis: 1.Change another switch, the link continues flap 2.Use G.652 optical fiber test in lab, Link works ok. Optical module Tx power and Rx power are in spec. That means optical transceivers performance are ok. 3.DWDM optical modules work well on G.655 link ， that means G.655 link no break. 4 . Deduce ： The optical module wavelength and fiber type don’t match Root Cause: Optical modules with a working wavelength of 1310nm cannot use G . 655 optical fiber for long-distance transmission , G.655 Optical cable cutoff wavelength ≤ 1480nm, work...