Title :
A MAP equalizer for the optical communications channel
Author :
Xi, Wenze ; Adali, Tülay ; Zweck, John
Author_Institution :
Dept. of Comput. Sci. & Electr. Eng., Univ. of Maryland Baltimore County, MD, USA
Abstract :
A maximum a posteriori (MAP) equalizer is presented for optical fiber communication systems. Assuming that the span of the intersymbol interference (ISI) does not extend beyond neighboring bits-typically the case for the distortion introduced by polarization-mode dispersion (PMD)-we derive the conditional probability density function (pdf) in the electrical domain in the presence of PMD and amplified spontaneous emission (ASE)-dominated noise. Simulation results with an accurate receiver model and all-order PMD show the success of the MAP equalizer in reducing the bit error rate (BER) degradation due to PMD.
Keywords :
equalisers; error statistics; intersymbol interference; maximum likelihood detection; optical distortion; optical fibre communication; optical fibre dispersion; optical fibre polarisation; optical noise; optical receivers; probability; superradiance; ASE-dominated noise; MAP detection; MAP equalization; amplified spontaneous emission; bit error rate degradation; intersymbol interference; maximum a posteriori equalizer; optical communications channel; optical fiber communication systems; polarization-mode dispersion; probability density function; receiver model; Bit error rate; Degradation; Equalizers; Intersymbol interference; Optical distortion; Optical fiber communication; Optical noise; Polarization mode dispersion; Probability density function; Spontaneous emission; Amplified spontaneous emission (ASE) noise; maximum a posteriori probability (MAP) detection/equalization; polarization-mode dispersion (PMD); probability density function (pdf) estimation;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2005.853157
