Low code rate DP-8PSK was studied as an alternative to DP-QPSK for long distance coherent communications. For 4,000 km transmission with multiple link configurations, low code rate DP-8PSK is shown to have 1.6 1.8 dB span loss budget over DP-QPSK for the same spectral efficiency through simulations.

© 2016 Optical Society of America

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