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Applying LDPC codes to turbo equalization of PMD channels requires them to be adopted to the equalizer. A design using fitted EXIT functions offers improved OSNR tolerance of ca. 5 dB compared to MLSE equalization.
Advanced electronic signal processing for high-bit-rate lightwave systems has become available recently. Adaptive receiver concepts are proposed to mitigate dynamic changes in the optical channel response. In particular, two different approaches are under discussion: independent equalization and decoding, e.g., by maximum-likelihood sequence estimation followed by a separate error-correction decoder,...
For receivers using an adaptive threshold, a feed forward/decision feedback or a Viterbi equalizer with either single or polarization diversity inputs, optical and electrical filter bandwidths are investigated for chromatic dispersion and PMD.
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