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We study the performances of several electrical dispersion compensation (EDC) equalizers in the presence of chromatic dispersion and polarization mode dispersion for optical coherent- and direct-detection on–off keying systems. The EDCs that are analyzed include decision-feedback equalizer, linear equalizer, and maximum-likelihood sequence estimator (MLSE). We present an inclusive quantitative analysis of the performance difference between the various techniques. The MLSE gives a good indication of the best possible performance.
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Katz et al. (2006) studied this question.
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