標題: Spectrally efficient polarization multiplexed direct-detection OFDM system without frequency gap
作者: Wei, Chia-Chien
Zeng, Wei-Siang
Lin, Chun-Ting
光電系統研究所
Institute of Photonic System
公開日期: 25-一月-2016
摘要: We experimentally demonstrate a spectrally efficient direct-detection orthogonal frequency-division multiplexing (DD-OFDM) system. In addition to polarization-division multiplexing, removing the frequency gap further improves the spectral efficiency of the OFDM system. The frequency gap between a reference carrier and OFDM subcarriers avoids subcarrier-to-subcarrier beating interference (SSBI) in traditional DD-OFDM systems. Without dynamic polarization control, the resulting interference after square-law direct detection in the proposed gap-less system is polarization-dependent and composed of linear inter-carrier interference (ICI) and nonlinear SSBI. Thus, this work proposes an iterative multiple-input multiple-output detection scheme to remove the mixed polarization-dependent interference. Compared to the previous scheme, which only removes ICI, the proposed scheme can further eliminate SSBI to achieve the improvement of similar to 7 dB in signal-to-noise ratio. Without the need for polarization control, we successfully utilize 7-GHz bandwidth to transmit a 39.5-Gbps polarization multiplexed OFDM signal over 100 km. (C) 2016 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.24.001823
http://hdl.handle.net/11536/133041
ISSN: 1094-4087
DOI: 10.1364/OE.24.001823
期刊: OPTICS EXPRESS
Volume: 24
Issue: 2
起始頁: 1823
結束頁: 1828
顯示於類別:期刊論文


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