Article Overview
A Huawei optical module not emitting light is usually caused by a faulty module, improper installation, fiber incompatibility, or contamination of the optical ports.
Common Causes
- Faulty Optical Module: The module itself may be defective, including issues with the laser transmission circuit .
- Improper Installation: The module may not be securely seated in the port. Reinstalling it can sometimes restore functionality .
- Fiber Compatibility Issues: Single-mode and multi-mode fibers must match the optical module type. Using a 10G module on a 1G interface or mixing fiber types can prevent light emission .
- Contaminated Optical Ports: Dust or dirt on the optical bores can block light. Cleaning with a cotton swab and using dust caps on idle ports is recommended .
- Incorrect Fiber Connection: Reversing the transmit and receive ends of the fiber jumper can prevent light from being transmitted .
- Device or Software Issues: Bugs in device management or driver software may affect module operation. Rebooting or updating firmware may help .
Diagnostic Steps
- Check Optical Power: Use an optical power meter to measure the transmit and receive power. If abnormal, the module may need replacement .
- Verify Module Status: Run commands such as
display interface <interface>ordisplay transceiver interface <interface> verboseto check link status, optical power, and module type . - Loopback Test: Connect the fiber jumper to the same module to test if the port emits light. This helps isolate module vs. fiber issues .
- Swap Modules or Ports: Install the module in another compatible port or replace it with a known working module to confirm if the original module is faulty .
Recommended Actions
- Clean optical ports and ensure dust caps are used on idle modules.
- Reinstall the module securely in the port.
- Check fiber type and module compatibility.
- Replace the module if optical power remains abnormal or the module fails diagnostics.
- Contact Huawei technical support if the problem persists after these steps . Following these steps systematically can help identify whether the issue is with the optical module, fiber, or device configuration, ensuring proper restoration of optical signal transmission.
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