Open AccessEfficient joint timing and frequency synchronization algorithm for coherent optical OFDM systems
Author(s) -
Xinwei Du,
Jing Zhang,
Yan Li,
Yu Chen,
Pooi Yuen Kam
Publication year - 2016
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.24.019969
Subject(s) - orthogonal frequency division multiplexing , qam , computer science , quadrature amplitude modulation , synchronization (alternating current) , algorithm , phase noise , electronic engineering , subcarrier , modulation (music) , optics , bit error rate , telecommunications , physics , decoding methods , engineering , channel (broadcasting) , acoustics
A joint timing and frequency synchronization algorithm is proposed for coherent optical orthogonal frequency-division multiplexing (CO-OFDM) systems. The timing and frequency synchronization is realized by using only one training symbol which is composed of conjugated symmetric sequence. The timing estimation of the proposed algorithm has the advantage of being robust to poor optical signal-to-noise ratio (OSNR) and chromatic dispersion (CD), and the frequency estimation range of fractional subcarrier spacing can be achieved. The feasibility and effectiveness of the proposed joint synchronization algorithm is verified in both simulations and a 47.3 Gbit/s 16-ary quadrature amplitude modulation (16-QAM) CO-OFDM system.