Study on Opto-Electronic Hybrid Signal Processing for Long-Distance Optical Fiber Transmission

为了实现对各种波形失真和噪声具有上级容限的长距离高速光纤传输系统，我们研究了光信号整形和噪声抑制方法。获得以下结果：（1）提出了部分在电域进行信号整形的光电混合信号再生方案，并通过实验和数值模拟证明了其有效性，（2）我们表明，接收端的电信号处理（如序列估计）可以在一定程度上提高周期性配备信号再生器的系统的色散容限，（3）提出并讨论了QPSK信号的相敏放大等高功能全光信号再生技术。

We studied optical signal reshaping and noise reduction methods with an aim to realize long-distance and high-speed optical fiber transmission systems with superior tolerance to various kinds of waveform distortion and noise. Following results are obtained: (1) we proposed opto-electronic hybrid signal regeneration schemes where signal reshaping is partially performed in the electrical domain and demonstrated their effectiveness by experiments and numerical simulation, (2) we showed that electrical signal processing such as sequence estimation at the receiver can enhance dispersion tolerance of the system periodically equipped with signal regenerators to some degree, and (3) we proposed and discussed high functionality all-optical signal regeneration such as phase-sensitive amplification for QPSK signals.