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Which of the following is used in the specification of optical detectors?

Which of the following is used in the specification of optical detectors? Correct Answer Noise equivalent power

Key Points
When a photodetector does not get any input light, it nevertheless produces some noise output with a certain average power, which is proportional to the square of the RMS voltage or current amplitude.
  • The Noise Equivalent Power (NEP) of the device is the optical input power which produces an additional output power identical to that noise power for a given bandwidth.
  • If the input is interpreted as a signal, the output signal and noise are then identical, i.e the SNR would be 1.
 
Additional Information

The noise equivalent power depends on the optical wavelength, since that influences the responsivity of the detector.

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