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Reconfigurable optical inter-channel interference mitigation for spectrally overlapped QPSK signals using nonlinear wave mixing in cascaded PPLN waveguides

Yinwen Cao, Morteza Ziyadi, Amirhossein Mohajerin-Ariaei, Ahmed Almaiman, Peicheng Liao, Changjing Bao, Fatemeh Alishahi, Ahmad Falahpour, Bishara Shamee, Jeng-yuan Yang, Youichi Akasaka, Motoyoshi Sekiya, Moshe Tur, Carsten Langrock, Martin Fejer, Joseph Touch, and Alan E. Willner

Abstract

A reconfigurable all-optical inter-channel interference (ICI) mitigation method is proposed for an overlapped channel system that avoids the need for multi-channel detection and channel spacing estimation. The system exhibits a 0.5-dB implementation penalty compared to a single-channel baseline system. Experiments using a dual-carrier QPSK overlapped system with both 20G-baud and 25G-baud under different channel spacing conditions evaluate the performance of the method. Improved signal constellation and receiver sensitivity demonstrate the effectiveness of this approach. This results in over 4-dB OSNR of benefit when the system Q-factor reaches a forward error correction (FEC) threshold of 8.5 dB under less-than-baudrate channel spacing conditions.

© 2016 Optical Society of America

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