Nonlinear performance of 8QAM-alternative modulation formats are compared to evaluate the BICM capacity. Simulation results show that the recently proposed 4D-2A8PSK, optimized DP-Circular-8QAM, and 64SP-12QAM all have at least 0.7 dB margins than DP-Star-8QAM.

© 2016 Optical Society of America

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