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Normal output power of optical module

The average output power of an optical module is the optical power emitted by its transmitter under normal operating conditions, typically measured in dBm, mW, or W.Definition and Measurement

The average output power represents the intensity of light emitted by the optical module's laser or LED during normal operation. It is influenced by the proportion of logical "1"s in the transmitted data signal; more "1"s result in higher optical power. When transmitting a pseudo-random sequence where "1"s and "0"s are roughly equal, the measured power corresponds to the average optical power. This power is commonly expressed in milliwatts (mW), watts (W), or decibels relative to 1 mW (dBm), with dBm being the standard unit in optical communications due to its logarithmic scale for easier comparison and link budget calculations .

Significance

Average output power is a critical parameter because it directly affects:

  • Transmission distance: Higher power allows signals to travel longer distances without significant attenuation.
  • Signal quality: Adequate power ensures a low bit error rate (BER) and reliable data reception.
  • System stability: Insufficient power can cause signal loss, while excessive power may saturate receivers or induce nonlinear effects .
Extinction Ratio

The extinction ratio is closely related to average output power. It is the ratio of the average optical power when transmitting all "1"s to the average power when transmitting all "0"s, expressed in dB. A higher extinction ratio improves the receiver's ability to distinguish between logical "1" and "0", reducing the likelihood of errors .

Typical Power Ranges

The average output power varies by module type and standard:

  • 1.25G SFP modules: Typically -3 dBm to -9 dBm for 20 km links.
  • 10G LRM modules: Typically -6.5 dBm to -1 dBm for short 220 m links.
  • SFP/SFP+/SFP28 modules: Power ranges depend on fiber type (single-mode or multimode) and link distance, with specifications provided in vendor datasheets .
Practical Considerations

When designing or deploying optical links, engineers must consider the average output power in conjunction with receiver sensitivity and the link budget to ensure reliable communication. Proper selection ensures that the transmitted signal maintains sufficient strength to reach the receiver while avoiding overdriving the system .

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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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