Nonlinear Effects Compensation Analysis for Dual Polarization 16QAM Optical Coherent Systems

High order modulation nonlinear effects has been appointed as the main limitation in coherent optical fiber transmission. Digital back-propagation algorithms are one of the current studied methods to cope with such impairment and extend the systems maximum reach. In this article, we analyzed the digital back-propagation performance in a 224 Gb/s dual polarization 16QAM optical coherent system. It was observed a 35% increase in maximum reached distance and an OSNR gain of 2.6 dB. In order to reduce the huge required computational complexity, an modified back-propagation algorithm is analyzed.