8 Optical Module
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Huawei Proprietary and Confidential
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If, for no apparent reason, optical signals are lost during the operation of a device, use
the preceding method to clean the receptacle or the optical connector. This will eliminate
contamination as the cause of the signal loss.
Precautions for the overload-caused burnt optical module
When using an OTDR to test the connectivity or the attenuation of optical signals,
disconnect the optical connector from the optical module. Otherwise, the optical module
may be burnt.
When performing a self-loop test, use an optical attenuator. Do not loosen the optical
connector.
It is required that a long-distance optical module have an input optical power of less than
-7 dBm. If the input optical power is larger than -7 dBm, you need to add an optical
attenuator. For example, if the transmiting optical power is X dBm and the optical
attenuation is Y dB, the receiving optical power is X-Y, which must be smaller than
-7dBm (X-Y<-7 dBm).
Other precautions
The optical connector should be horizontally inserted in the receptacle to avoid damages
to the receptacle.
Mixed use of multi-mode and single-mode optical fibers is prohibited. Otherwise, faults
such as signal loss may occur.
