Low Computational Complexity of Optical Nonlinear Compensation with Phase Linear Approximation Method for Single Polarization-64QAM Signals

We analytically investigated the effect of phase-linear-approximation on optical nonlinear compensation for single-polarized 28Gbaud 64QAM signals. 37.5 % reduction of computational complexity is expected with 1200 km transmission and input power of −5 dBm.