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Huawei optical module luminous value

Huawei optical modules' luminous value refers to the transmit (TX) and receive (RX) optical power, typically measured in dBm, which can be monitored via DDM commands on Huawei switches.Understanding Luminous Value

The luminous value of an optical module represents its optical power output (TX Power) and received optical power (RX Power). These values are critical for ensuring proper signal transmission and link quality. Huawei optical modules support Digital Diagnostic Monitoring (DDM), which allows real-time monitoring of:

  • TX Power (dBm): The optical power emitted by the module.
  • RX Power (dBm): The optical power received from the remote module.
  • High/Low Thresholds: Maximum and minimum safe operating power levels.
  • Bias Current (mA): Current driving the laser diode.
  • Voltage (V) and Temperature (°C): Operational parameters affecting optical performance ( ). For example, a typical SFP module output might show:
  • TX Power: -5.03 dBm
  • TX High Threshold: -2.22 dBm
  • TX Low Threshold: -6.99 dBm
  • RX Power: -40.00 dBm
  • RX High Threshold: 0.00 dBm
  • RX Low Threshold: -16.99 dBm ( ).
How to View Luminous Values on Huawei Switches

Huawei switches provide commands to query optical module information:

  1. Basic module information:

    display transceiver [ interface interface-type interface-number | slot slot-id ] [ verbose ] This command shows module type, wavelength, TX/RX power, and other DDM parameters ( ).

  2. Diagnostic information:

    display transceiver diagnosis interface [ interface-type interface-number ] This command provides detailed DDM readings, including real-time TX/RX power, voltage, temperature, and bias current ( ).

  3. Interface status check:

    display interface Confirms link status (UP/DOWN) and traffic statistics, which helps correlate optical power with link performance ( ).

Typical Ranges and Considerations
  • TX Power: Usually between -6 dBm and 0 dBm for standard SFP modules.
  • RX Power: Depends on distance and fiber type; must stay within module's RX threshold to avoid link errors.
  • Deviation from thresholds: If TX or RX power exceeds high/low thresholds, the module may fail to maintain a stable link.
  • Non-Huawei-certified modules: May have nonstandard power levels or DDM readings, potentially causing interface errors ( ). Monitoring luminous values ensures optimal optical link performance, early detection of fiber degradation, and proper troubleshooting of network issues.
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Technical note

This reference is intended for preliminary specialty-cable research. Compatibility, link budgets, fire performance, installation methods, test limits and applicable standards must be verified for the specific project.

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