P. Mertz, E. Burmeister, Hai Xu, V. Dominic, Han Sun, Kuang-Tsan Wu, S. Grubb, D. Welch
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Trellis Coded Modulated (TCM)-QPSK has been demonstrated as a coherent optical modulation format. For the first time its performance is compared to BPSK on four subsea segments of different lengths, showing performance benefits of up to 1.8 dB.