We propose a probabilistically-shaped four-dimensional LDPC-coded modulation (PS-4D-LDPC- CM) scheme as a candidate suitable for metro DWDM communications. We experimentally demonstrate that PS modulation can also be used in high-dimensional-modulation scheme for DWDM systems, and that PS-4D- LDPC-CM scheme provides 1.3dB improvement over corresponding uniform distribution-based scheme.

© 2019 The Author(s)

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