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

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.