IEEE Communications Letters · 2020 · 13 citations · 7 references
EngineeringElectrical EngineeringPhysicsDigital CommunicationOpticsPhotonicsFiber OpticsFiber-optic CommunicationOptical Communication SystemsOptical FibersOptical ModulationSignal Detection TheoryBit-error Rate AnalysisFiber Optic Communication SystemsMinimum Mean Square Error EstimationOptical NoiseOptical Transmission SystemsThermal NoiseThermal Noise AnalysisWiener Filtering
Analytic expressions are derived for the Wiener filter (WF), also known as the linear minimum mean square error (LMMSE) estimator, for an intensity-modulation/direct-detection (IM/DD) short-haul fiber-optic communication system. The link is purely dispersive and the nonlinear square-law detector (SLD) operates at the thermal noise limit. The achievable rates of geometrically shaped PAM constellations are substantially increased by taking the SLD into account as compared to a WF that ignores the SLD.
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