Article ID: 2019XBL0072
We numerically assess the performance and computational complexity of split-step Fourier method based digital backpropagation (DBP) with phase linear approximation (PLA-DBP) for reduced complexity on digital implementation. From Manakov equation, we can confirm that the phase of the received signal compensated with DBP changes almost linearly between optical amplifiers, thus the input signal phase even with dual-polarization can be estimated using linear approximation using only two points. We show the performance evaluation of 28 Gbaud single carrier dual polarization-16 quadrature amplitude modulation (DP-16QAM) format, and 20.0% reduction in complexity is obtained with transmission distance of 4000 km and input power of 3 dBm.
