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An LDPC based soft-decision FEC having a NCG of 10.8dB has been implemented in a coherent ASIC. Greater gain and the interplay with nonlinearity equalizers are anticipated for the real deployment of 100G and beyond.
We discuss the practical implementation of LDPC codes in soft-decision FEC for 100 Gb/s digital coherent systems. The question of the definition of net coding gain for differential QPSK used to avoid cycle slip is raised.
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