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In order to achieve high-speed transmission over Optical Transport Networks (OTNs) and maximize its throughput, the authors propose using a rate-adaptive polarization-multiplexed coded multilevel modulation with coherent detection based on component non-binary Quasi-Cyclic (QC) LDPC codes. Compared to prior-art Bit-Interleaved LDPC-Coded Modulation (BILDPC-CM) scheme, the proposed Non-Binary LDPC-Coded Modulation (NB-LDPC-CM) scheme not only reduces latency due to symbol-instead of bit-level processing but also provides either impressive reduction in computational complexity or striking improvements in coding gain depending on the constellation size.
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