Open AccessExperimental demonstration of improved fiber nonlinearity tolerance for unique-word DFT-spread OFDM systems
Author(s) -
Xi Chen,
An Liu,
Guanjun Gao,
William Shieh
Publication year - 2011
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.19.026198
Subject(s) - orthogonal frequency division multiplexing , transmission (telecommunications) , optics , computer science , spectral efficiency , electronic engineering , spectral density , nonlinear system , optical fiber , telecommunications , physics , channel (broadcasting) , engineering , quantum mechanics
In this paper we experimentally demonstrate transmission performance of optical DFT-spread OFDM systems in comparison with conventional OFDM systems. A 440.8-Gb/s superchannel consisting of 8 x 55.1-Gb/s densely-spaced DFT-S OFDM signal is successfully received after 1120-km transmission with a spectral efficiency of 3.5 b/s/Hz. It is shown that DFT-S OFDM can achieve an improvement of 1 dB in Q factor and 1 dB in launch power over conventional OFDM. Additionally, unique word aided phase estimation algorithm is proposed and demonstrated enabling extremely long OFDM symbol transmission.