標題: Spectrally Efficient Direct-Detected OFDM Transmission Incorporating a Tunable Frequency Gap and an Iterative Detection Techniques
作者: Peng, Wei-Ren
Zhang, Bo
Feng, Kai-Ming
Wu, Xiaoxia
Willner, Alan E.
Chi, Sien
光電工程學系
Department of Photonics
關鍵字: Optical-fiber communication;optical modulation;orthogonal frequency-division multiplexing (OFDM)
公開日期: 15-Dec-2009
摘要: We analytically and experimentally demonstrate a linearly field-modulated, direct-detected virtual single-side-band orthogonal frequency-division multiplexing (VSSB-OFDM) system that employs a tunable frequency gap and an iterative detection technique. The VSSB-OFDM that uses no frequency gap, which is referred to as the gapless VSSB-OFDM, is proposed as a spectrally efficient format. Compared with the intensity-modulated SSB-OFDM, the gapless VSSB-OFDM saves half the electrical bandwidth (BW), and exhibits better receiving sensitivity and more robust tolerance against fiber chromatic dispersion (CD). Furthermore, by incorporating a tunable frequency gap between the optical carrier and the OFDM data sideband, the calculating burden of the iterative detection is greatly alleviated and the system performance can be flexibly improved within moderate iterations. The width of the optimum frequency gap is found to be similar to 0.35 sideband BW, which is reached by trading the levels of signal-signal beat interference and the residual image beat interference. Such a gapped VSSB-OFDM system requires fewer iterations to extract the desired data from the interfered signal and exhibits greater robustness against the carrier-to-signal-power ratio (CSPR) variation, compared with the gapless VSSB-OFDM. In this paper, the analytical model of the proposed gapped VSSB-OFDM system will be addressed. In addition, we also successfully conduct a gapped VSSB-OFDM signal transmission over 1600 km of uncompensated standard single-mode fiber (SSMF) with only similar to 3 dB optical SNR (OSNR) penalty, and obtain a significant OSNR sensitivity improvement of 8 dB, compared with the gapless VSSB-OFDM, after such a 1600-km fiber link.
URI: http://dx.doi.org/10.1109/JLT.2009.2033304
http://hdl.handle.net/11536/6313
ISSN: 0733-8724
DOI: 10.1109/JLT.2009.2033304
期刊: JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume: 27
Issue: 24
起始頁: 5723
結束頁: 5735
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