基于超奈奎斯特镜像混叠的正交频分复用无源光网络  

OFDM Passive Optical Networks Based on Super-Nyquist Image Induced Aliasing

作　　者：郭昌建[1] 郑毅成[1] 梁家伟[1,2] 洪学智[1] 李榕[2] Guo Changjian Zheng Yicheng Liang Jiawei Hong Xuezhi Li Rong(South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, China School of Physics and Telecommunication Engineering, South China Normal Univesity, Guangzhou, 510006, China)

机构地区：[1]华南师范大学华南先进光电子研究院,广州510006 [2]华南师范大学物理与电信工程学院,广州510006

出　　处：《数据采集与处理》2017年第2期330-336,共7页Journal of Data Acquisition and Processing

基　　金：国家自然科学基金青年基金(61307090)资助项目;广东省自然科学基金(2014A030313430)资助项目;广东省引进创新科研团队(201001D0104799318)资助项目

摘　　要：结合自相位调制引入负啁啾和超奈奎斯特镜像混叠技术,实现了一个大容量、大功率预算的长距离无源光网络(Long reach passive optical networks,LR-PON)系统。引入镜像混叠后,混叠部分的子载波将引入分集,提出采用分数采样和逐子载波最大比值合并(Maximum ratio combining,MRC)算法来获得分集增益。仿真和实验结果表明通过使用大入纤功率和镜像混叠,可将10GHz带宽正交相移键控(Quadrature phase shift keying,QPSK)调制的正交频分复用(Orthogonal frequency-division multiplexing,OFDM)信号传输距离由45km扩展至超过80km。本文还使用自适应调制技术实现了速率大于32Gb/s、功率预算超过32dB的LR-PON系统。A novel long reach passive optical networks（LR-PON）with high power budget and high capacity is investigated.Based on self-phase modulation（SPM）induced negative chirp and super-Nyquist image induced aliasing,diversity is firstly introduced to the aliased components using the first-order superNyquist image.Then fractional sampling and per-subcarrier maximum ratio combining（MRC）are adopted to harvest the diversity gain.Simulation and experimental results show that,using our proposed scheme,the transmission length of a 10 GHz bandwidth QPSK modulated orthogonal frequency-division multiplexing（OFDM）signal can be extended from 45 km to more than 80 km without any forbidden area.It is also shown that with adaptive modulation,the proposed LR-PON system has a data rate of more than 32Gb/s and a power budget of larger than 32 dB.

关 键 词：超奈奎斯特镜像 光正交频分复用 自相位调制 

分 类 号：TN913.7[电子电信—通信与信息系统]