Open AccessOptimization of training sequence for DFT-spread DMT signal in optical access network with direct detection utilizing DML
Author(s) -
Fan Li,
Xinying Li,
Jianjun Yu,
Lin Chen
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.22.022962
Subject(s) - modulation (music) , optics , phase shift keying , quadrature amplitude modulation , transmission (telecommunications) , narrowband , computer science , signal to noise ratio (imaging) , interference (communication) , qam , physics , channel (broadcasting) , electronic engineering , telecommunications , bit error rate , acoustics , engineering
We experimentally demonstrated the transmission of 79.86-Gb/s discrete-Fourier-transform spread 32 QAM discrete multi-tone (DFT-spread 32 QAM-DMT) signal over 20-km standard single-mode fiber (SSMF) utilizing directly modulated laser (DML). The experimental results show DFT-spread effectively reduces Peak-to-Average Power Ratio (PAPR) of DMT signal, and also well overcomes narrowband interference and high frequencies power attenuation. We compared different types of training sequence (TS) symbols and found that the optimized TS for channel estimation is the symbol with digital BPSK/QPSK modulation format due to its best performance against optical link noise during channel estimation.