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Improvement of the chromatic dispersion tolerance in coherent optical OFDM systems using shifted DFT windows for ultra-long-haul optical transmission systems

Authors
Sung, MinkyuKim, HoonLee, JaehoonJeong, Jichai
Issue Date
22-9월-2014
Publisher
OPTICAL SOC AMER
Citation
OPTICS EXPRESS, v.22, no.19, pp.23539 - 23551
Indexed
SCIE
SCOPUS
Journal Title
OPTICS EXPRESS
Volume
22
Number
19
Start Page
23539
End Page
23551
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/97376
DOI
10.1364/OE.22.023539
ISSN
1094-4087
Abstract
In a high-capacity ultra-long-haul optical coherent orthogonal frequency-division multiplexing (CO-OFDM) system, the dispersion tolerance is determined by the length of cyclic extension (CE). In this paper, we propose a novel scheme to substantially improve the dispersion tolerance of CO-OFDM systems without increasing the CE length. Multiple time-shifted discrete Fourier transform (DFT) windows are exploited at the receiver, each demodulating only a part of the subcarriers. Effectively, the proposed scheme reduces the bandwidth of the OFDM signals under demodulation. Numerical simulations are performed to show the improved dispersion tolerance of the proposed scheme in comparison with the conventional CO-OFDM system. We show that the dispersion tolerance improves by a factor equal to the number of DFT windows. The tradeoff between the improved dispersion tolerance and increased receiver complexity is also presented. (C) 2014 Optical Society of America
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