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随着色散补偿技术的成熟，高速光纤通信中另一个限制因素———非线性将随着光纤链路加长而积累起来，并引起新的波形展宽．就每一段光纤而言，均属弱非线性的色散光纤，因此，有必要对光信号在这种光纤中的演化进行深入研究．本文在前人研究的基础上得出了只考虑一阶初始非线性时ＮＲＺ码在弱非线性色散光纤中传输时域和频谱近似解析式，并且给出了频谱、波形随距离、色散、非线性的变化图．对于由正、负色散光纤组成的光纤链路，得出了色散达到最佳补偿时的非线性干扰系数．
As dispersion compensation technology matures, another limiting factor in high-speed optical fiber communications, nonlinearity, will accumulate as fiber links grow and cause new wave broadening. For each segment of fiber, it is a weak non-linear dispersion fiber, therefore, it is necessary to study the optical signal in this fiber evolution. Based on the previous studies, we obtain the approximate analytic formula of the transmission time domain and spectrum of NRZ code in weakly nonlinear dispersive optical fiber considering only the first-order initial nonlinearity, and give the frequency spectrum. The waveform varies with the distance, dispersion, Linear change diagram. For the optical fiber link consisting of positive and negative dispersion fibers, the nonlinear interference coefficient is obtained when the dispersion is optimally compensated.