Wiener Filter for Short-Reach Fiber-Optic Links
arXiv:2004.12148 · doi:10.1109/LCOMM.2020.3006921
Abstract
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.
Accepted to IEEE Communications Letters