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Accurate estimate and measurement of continuous-wave noise in filtered incoherent light

We derive an exact expression for the continuous-wave signal-to-noise ratio of filtered incoherent light, which applies to arbitrary optical filtering and arbitrary receiver electrical response. We demonstrate a simple method for making accurate measurements of continuous-wave signal-to-noise ratio, and compare these measurements with values computed from independent measurements of optical-filter coherence time and receiver electrical response ; our measurements and computed values agree to within ±0.2 dB.

statistical optics ; fiber optics communications

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