The failure of the optical module function is divided into the failure of the transmitting end and the failure of the receiving end. After analyzing the specific reasons, the most common problems are concentrated in the following aspects:
1. Optical port pollution and damage
The pollution and damage of the optical interface cause the loss of the optical link to increase, 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 again
Improper use of the end face of the optical connector with pigtail, scratches on the end face, etc.
Use inferior fiber optic connectors
2. ESD damage
ESD is the abbreviation of ElectroStatic Discharge, that is, "electrostatic discharge", which is a very fast process whose rise time can be less than 1ns (one billionth of a second) or even hundreds of ps (1ps=one billionth of a second).
ESD can generate strong electromagnetic pulses of tens of Kv/m or even greater.
Static electricity will absorb dust, change the impedance between 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 can still work in a short period of time but its life will be affected; it will even destroy the insulation or conductor of the component, causing the Components are inoperable (completely destroyed).
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: non-hot-swappable optical module live operation; direct hand contact with the static-sensitive pins of the optical module without electrostatic protection; no anti-static packaging during transportation and storage
The device is not grounded or is poorly grounded
Simple optical module failure judgment steps
1. Test whether the optical power is within the required range of the index, if there is no light or low optical power.
Approach:
a. Check the wavelength and measurement unit (dBm) of optical power selection
b. Clean the end face of the optical fiber connector and the optical port of the optical module. For the method, refer to Section 5.
c. Check whether the end face of the fiber optic connector is black and scratched, whether the fiber optic connector is broken, and replace the fiber optic connector for an interchangeability test
d. Check whether there is a small bend in the fiber optic connector.
e. The hot-swappable optical module can be re-plugged and tested.
f. Replace the optical module on the same port or replace the port test on the same optical module.
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