title: Experimental demonstration of improved fiber nonlinearity tolerance for unique-word DFT-spread OFDM systems.
abstract: 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.
authors.affiliation: Department of Electrical and Electronic Engineering, The University of Melbourne, VIC 3010, Australia. xi.chen@ee.unimelb.edu.au
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.forename: An
authors.initials: A
authors.lastname: Li
authors.forename: Guanjun
authors.initials: G
authors.lastname: Gao
authors.forename: William
authors.initials: W
authors.lastname: Shieh
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D017711:Nonlinear Dynamics; D055096:Optical Devices; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*