Open AccessModulation-format-independent blind phase search algorithm for coherent optical square M-QAM systems
Author(s) -
Xian Zhou,
Kangping Zhong,
Yuliang Gao,
Chao Lu,
Alan Pak Tao Lau,
Keping Long
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.024044
Subject(s) - quadrature amplitude modulation , qam , computer science , phase modulation , modulation (music) , optics , algorithm , phase shift keying , digital signal processing , pulse amplitude modulation , polarization division multiplexing , multiplexing , electronic engineering , signal processing , physics , telecommunications , phase noise , bit error rate , engineering , computer hardware , decoding methods , pulse (music) , detector , acoustics
Modulation format independence is one of the key challenges in digital signal processing (DSP) techniques for future elastic optical transmissions. We proposed a modulation-format-independent blind phase search (MFI-BPS) algorithm for square M-ary quadrature amplitude modulation (M-QAM) systems, in which modulation format recognition (MFR) and carrier phase estimation (CPE), are included and implemented both in a feed-forward manner. Comprehensive simulation and the experimental studies on 224 Gbit/s polarization multiplexing 16-QAM (PM-16QAM) systems demonstrate the feasibility and the effectiveness of the proposed MFI-BPS algorithm.