TR2015-103

BICM capacity analysis of 8QAM-alternative modulation formats in nonlinear fiber transmission



We investigate the nonlinear performance of 8QAM-alternative 4D modulation format using GMI to evaluate the BICM capacity. Due to its constant modulus feature, the 4D-2A8PSK modulation has higher nonlinear threshold than Star- 8QAM and Circular-8QAM.