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.
Method of distinguishing optical modules in single mode and multi-mode.
Table 1-1670 Method of distinguishing optical modules in single mode and multi-mode
1.11.2 Configuring an Optical Attenuator
This section describes how to configure an optical attenuator.
Calculating the Optical Attenuation
You can calculate the optical attenuation based on the actual optical power.
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