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 |