The input power of an optical module refers to the optical signal power received by the module's receiver. It is a critical parameter because excessive power can damage the module, while insufficient power can prevent proper signal detection ( ). Input power is usually expressed in dBm, a logarithmic unit relative to 1 milliwatt, or in linear units like mW or W ( ). Optical power can be measured using optical power meters or optical spectrum analyzers, which provide accurate readings of the power entering the module ( ).
The nominal input power is the recommended power level for normal operation, often calculated based on the system's wavelength configuration and optical amplifier gain ( ). Optical power tolerance defines the acceptable range of input power, from the module's sensitivity (minimum detectable power) to the overload point (maximum safe power) ( ). Optical power margin is an additional buffer to ensure reliable operation, for example, a specification of –5/+3 dB indicates the module can tolerate 5 dB below and 3 dB above the nominal input power ( ).
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