The use of optical modules can be said to be extremely familiar to hardware engineers, but we often encounter some small problems when using optical modules, such as the failure of optical modules, which often gives us headaches. Let's talk about what happened to the optical module failure, and how to judge the failure of the optical module.
ZR Cable Optical Module
What happened to the failure of the optical module
The failure of the optical module function is divided into the failure of the transmitter and the failure of the receiver. After analyzing the specific reasons, the most common problems are concentrated in the following aspects:
1. Optical port pollution and damage
Due to the pollution and damage of the optical interface, the loss of the optical link increases, resulting in the failure of the optical link. The reasons are as follows:
The optical port of the optical module is exposed to the environment, and the optical port is polluted by dust entering.
The end face of the optical fiber connector used has been polluted, and the optical port of the optical module is polluted twice.
Improper use of the end face of the optical connector with pigtails, scratches on the end face, etc.
Use inferior fiber optic connectors
2. ESD damage
ESD is the abbreviation of ElectroStaticDischarge or "electrostatic discharge", which is a very fast process whose rise time can be less than 1ns (one billionth of a second) or even several hundred ps (1ps=1,000,000,000,000th of a second).
ESD can generate strong electromagnetic pulses of tens of Kv/m or even larger.
Static electricity will attract dust, change the impedance between the lines, and affect the function and life of the product; the heat generated by the instantaneous electric field or current of ESD will damage the component, and it will still work in a short time but its life will be affected; it will even destroy the insulation or conductor of the component, making the Component does not work (completely breaks).
ESD is inevitable. In addition to improving the ESD resistance of electronic components, it is important to use them correctly. The factors that cause ESD damage are:
Dry environment, prone to ESD
Abnormal operations, such as: live operation of non-hot-swappable optical modules; directly touching the static-sensitive pins of optical modules without electrostatic protection; no anti-static packaging during transportation and storage, equipment is not grounded or poorly grounded
How to judge the failure of the optical module
1. Test whether the optical power is within the required range of the index, if there is no light or the optical power is small.
Approach:
a. Check the wavelength and measurement unit (dBm) of the optical power selection
b. Clean the end face of the optical fiber connector and the optical port of the optical module, see Section 5 for the method.
c. Check whether the end face of the optical fiber connector is black and scratched, whether the optical fiber connector is broken, and replace the optical fiber connector for the interchangeability test
d. Check whether there are small bends in the fiber optic connector.
e. The hot-plug optical module can be re-plugged and tested.
f. Replace the optical module with the same port or replace the port with the same optical module.
2. The optical power is normal but the link cannot be connected. Check the link light.
The above is the whole content of what happened to the optical module failure and how to judge the failure of the optical module. When encountering the failure of the optical module, don't worry, and quickly use the above method to judge. I hope that the above can give you some help.
