Chen Xi, Li An, Gao Guanjun, Shieh William
Department of Electrical and Electronic Engineering, The University of Melbourne, VIC 3010, Australia.
Opt Express. 2011 Dec 19;19(27):26198-207. doi: 10.1364/OE.19.026198.
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.
