Optical module function failure is divided into transmitter side failure and receiver side failure, and the most frequent problems are concentrated in the following areas.
1, optical port contamination and damage
Due to the optical interface pollution and damage caused by optical link loss becomes large, resulting in optical link does not work. Generated by the following reasons.
Optical module optical port is exposed to the environment, the optical port is contaminated by the entry of dust
The end face of the fiber optic connector used has been contaminated, the optical module optical port secondary contamination
Improper use of the end face of the optical connector with pigtail, end face scratches, etc.
Use of poor quality fiber optic connectors
2、ESD damage
ESD (Electro Static Discharge), is a rise time can be less than 1ns (1 billionth of a second) or even hundreds of ps (1ps = 10000 billionth of a second) of a very fast process.
ESD can generate strong electromagnetic pulses of tens of Kv/m or even greater.
Static electricity will adsorb dust and change the impedance between lines, affecting the function and life of the product; the instantaneous electric field of ESD or the heat generated by the current will injure the component, which can still work in the short term but its life is affected; it even destroys the insulation or conductor of the component so that the component cannot work (complete destruction).
ESD is inevitable, in addition to improving the electronic components anti-ESD ability, it is important to use correctly, causing ESD damage to the following factors
Dry environment, easy to generate ESD
abnormal operation, such as: non-hot-swappable optical module charged operation; do not do electrostatic protection directly by hand contact with the optical module electrostatic sensitive pins; transportation and storage process without anti-static packaging equipment is not grounded or poor grounding
How to determine the failure of optical modules
1, test whether the optical power in the indicator requirements within the range, if there is no light or optical power small phenomenon.
Treatment methods.
a, check the optical power selection of wavelength and measurement unit (dBm)
b, clean the fiber optic connector end face, optical module optical port, see section V for the method.
c, check whether the fiber optic connector end face is blackened and scratched, fiber optic connector is broken, replace the fiber optic connector to do interchangeability test
d, check whether there is a small bend in the fiber optic connector.
e, hot-swappable optical modules can be re-plugged test.
f, the same port replacement optical module or the same optical module replacement port test.
2, optical power is normal but the link can not pass, check the link light.
The above is the optical module failure and how to determine the optical module failure of all the content, when encountered optical module failure do not need to rush, hurry to use the above method to determine the next, I hope the above can give you some help.
