5. Signal-to-noise ratio
The theoretical analysis of a photonic system’s performance involves evaluating the signal-to-noise ratio at the detector output, which requires knowledge of the signal detection mode employed by the system. In photonic devices, there are two detection modes that differ from one another in terms of signal and noise, as well as the parameters they allow us to obtain: these are direct detection and heterodyne (or coherent) detection.
5.1 Direct Detection
Direct detection can be used for all types of radiation, whether monochromatic or broadband. The “useful signal” at the detector output is, according to the equation (8)...
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Signal-to-noise ratio
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