Huawei optical module transmit power can be monitored and adjusted using system commands, threshold settings, and module replacement if necessary.

Checking Optical Module Power

To monitor the transmit (TX) and receive (RX) power of an optical module on Huawei devices, use the following commands:

• Display interface information: display interface <interface-type> <interface-number> This shows the interface rate, module type, link status, and traffic statistics, which helps identify abnormal conditions .
• Display transceiver details: display transceiver interface <interface-type> <interface-number> verbose This command provides detailed TX and RX optical power readings, wavelength, and module status .
• For 100GE modules: display interface 100GE This shows the optical power for each 25G wave on the interface .

Adjusting Transmit Power

If the TX power is below the acceptable range, follow these steps:

1. Check the current TX power and thresholds: Use display transceiver slot <slot-id> verbose to verify if the TX power is within the allowed range .
2. Adjust the lower threshold: If the TX power is within the module's capability but triggers alarms, run: transceiver diagnosis threshold tx-power This command allows you to modify the transmit power lower threshold to prevent unnecessary alarms .
3. Replace the optical module: If the TX power remains low after threshold adjustment, the module may be faulty. Replace it with a module of the same type and recheck the power .

Troubleshooting Tips

• Ensure fiber and module compatibility: single-mode modules with single-mode fiber, multimode with multimode fiber .
• Avoid using modules with a higher rate than the interface (e.g., 10G module on a 1G port), .
• Perform a loopback test by connecting the fiber jumper to the same module to check for abnormal conditions .
• Cover idle optical ports with dust caps to prevent contamination, which can reduce TX power .
• Collect alarms, logs, and configurations before contacting Huawei technical support if issues persist .

Summary

Monitoring and adjusting Huawei optical module power involves checking TX/RX readings, modifying threshold settings, and replacing faulty modules if necessary. Proper fiber-module compatibility and preventive maintenance, such as dust caps, help maintain optimal optical link performance. Using the commands above ensures accurate diagnostics and effective power adjustment.