1　前言自单模光纤投入使用以来 ,限制高速光纤通信系统进行长距离传输的因素主要有两个 ,其一是光纤的衰耗 ,其二是光纤的色散。光纤的衰耗使信号在传输过程中不断衰减 ,使光信号的传输距离受到限制。光纤的色散使具有一定光谱线宽的光脉冲在传输过程中不断展宽 ,最终产生码间 1 Introduction Since the single-mode fiber has been put into use, there are mainly two factors that limit the long-distance transmission of the high-speed optical fiber communication system. One is the attenuation of the fiber and the other is the dispersion of the fiber. Fiber attenuation causes the signal in the transmission process continuously decay, so that the optical signal transmission distance is limited. Dispersion of optical fiber to a certain spectral width of the light pulse in the continuous expansion of the transmission process, resulting in code room