Low-complexity DBP using optical-field-intensity averaging for digital coherent system

摘要

We numerically assess the performance and computational complexity of split-step Fourier method-based digital backpropagation with optical-field-intensity averaging (FIA-DBP) for reducing digital signal processing complexity in an optical receiver. We propose FIA-DBP to effectively compensate for nonlinear distortions due to symbol interactions. FIA-DBP averages the optical field intensity estimated in every span from received signals. We show the numerical results for 56Gbaud single carrier dual polarization-64 quadrature amplitude modulation signals. Our proposed method achieves a complexity 50.8% less than that of conventional digital backpropagation at a transmission distance of 2400km and a launched power of -2dBm.