Open AccessLinearly interpolated sub-symbol optical phase noise suppression in CO-OFDM system
Author(s) -
Xuezhi Hong,
Sailing He
Publication year - 2015
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.004691
Subject(s) - interpolation (computer graphics) , laser linewidth , phase noise , algorithm , symbol (formal) , interference (communication) , orthogonal frequency division multiplexing , phase (matter) , computer science , noise (video) , monte carlo method , signal to noise ratio (imaging) , optics , mathematics , physics , telecommunications , laser , statistics , artificial intelligence , channel (broadcasting) , frame (networking) , quantum mechanics , image (mathematics) , programming language
An optical phase noise suppression algorithm, LI-SCPEC, based on phase linear interpolation and sub-symbol processing is proposed for CO-OFDM system. By increasing the temporal resolution of carrier phase tracking through dividing one symbol into several sub-blocks, i.e., sub-symbols, inter-carrier-interference (ICI) mitigation is achieved in the proposed algorithm. Linear interpolation is employed to obtain a reliable temporal reference for sub-symbol phase estimation. The new algorithm, with only a few number of sub-symbols (N(B) = 4), can provide a considerably larger laser linewidth tolerance than several other ICI mitigation algorithms as demonstrated by Monte-Carlo simulations. Numerical analysis verifies that the best performance is achieved with an optimal and moderate number of sub-symbols. Complexity analysis shows that the required number of complex-valued multiplications is independent of the number of sub-symbols used in the proposed algorithm.