Open AccessReal-time experimental demonstration of optical OFDM symbol synchronization in directly modulated DFB laser-based 25km SMF IMDD systems
Author(s) -
Xianqing Jin,
R. P. Giddings,
E. Hugues-Salas,
J. M. Tang
Publication year - 2010
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.18.021100
Subject(s) - optics , computer science , orthogonal frequency division multiplexing , synchronization (alternating current) , modulation (music) , intensity modulation , symbol rate , quadrature amplitude modulation , transmission (telecommunications) , electronic engineering , phase modulation , bit error rate , phase noise , physics , algorithm , telecommunications , decoding methods , channel (broadcasting) , acoustics , engineering
A simple optical OFDM (OOFDM) synchronization technique utilizing subtraction and Gaussian windowing at the symbol rate is proposed and implemented in FPGA-based OOFDM receivers. End-to-end real-time symbol synchronization of 128-QAM-encoded OOFDM signals at raw bit rates of 6.56Gb/s is experimentally demonstrated, for the first time, over directly modulated DFB laser-based 25km SMF intensity modulation and direct detection (IMDD) systems. Experimental investigations show that the proposed synchronisation technique offers a number of salient advantages including low complexity, fast tracking speed, high accuracy and suitability for high-capacity optical transmission systems.