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2. Check whether wavelengths of optical transceivers on both sides are consistent. For example, an optical
transceiver with a wavelength of 1310 nm cannot be connected to an optical transceiver of 1550 nm.
3. Check whether the distance between two sides exceeds the maximum length marked on the optical
transceiver.
4. Check whether the speeds of two sides are consistent and whether the fiber cable type meets
requirements. For ports supporting different speeds, check their duplex mode settings.
1. An optical module is not completely installed in position.
If the optical module is not completely installed in position and the latch boss is not secured, the device
cannot identify the optical module. After the optical module works for a long time, it will be ejected under
external stress.
2. The optical receptacle on an optical module is contaminated.
If an optical module is not cleaned or protected properly, contaminants may accumulate on the fiber pin in the
optical module. As a result, the coupling efficiency is reduced, optical signals are cut off, or even worse, the
surface of the fiber pin is damaged permanently.
3. An optical module is burnt.
If high-power optical signals (caused by an optical time domain reflectometer or self-loop test) are
transmitted through an optical module that is used for long-distance transmission but no optical attenuator is
used, the optical power will exceed the overload power of the avalanche photodiode (APD). Then the optical
module is burnt.
The preceding faults lead to temporary or long-term cut-off of optical signals; or even cause permanent
damages to the optical module, affecting communication services.
2.3 Guide to Using Optical Modules
2.3.1 Common Faults of an Optical Module
2.3.2 Measures to Prevent a Loosened Optical Module
1. When installing an optical module, insert it in position. If you hear a click or feel a slight shake, it indicates
that the latch boss is secured.
If the latch boss is not secured, the gold finger of the optical module is not in good contact with the connector
on the board. In this case, the link may be connected but optical signals will be cut off or the optical module
will be loosened when the optical module is shaken or hit.
2. Figure 18 shows the release handle on an optical module when it is open and closed. When inserting the
optical module, make sure that the release handle is closed. At this time, the latch boss locks the optical
module. After the optical module is inserted, try pulling it out to see if it is installed in position. If the optical
module cannot be pulled out, it is secured.
Troubleshooting After Installation
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