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Optical Detector Definitions of Characteristics

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Optical Detector Definitions of Characteristics

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The frequency where the photodetector’s output electrical power has dropped 3 dB from a low-frequency reference. We specify the more conservative electrical 3 dB, rather than the larger optical 3 dB. (Optical 3 dB is equivalent to the electrical 6-dB frequency.)In our balanced photoreceivers, CMRR tells you how much noise rejection you can get by using the photoreceiver. The CMRR is defined as where VCM is the photodetector’s output voltage (proportional to the laser power present on the reference and signal diodes) at a given frequency. VBAL is the balanced photoreceiver’s output voltage at the same frequency.

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