对于高码率、长距离、色散管理准线性光纤传输， IFWM(信道内四波混频)是影响信号传输质量的主要非线性效应之一。文章采用分布傅里叶的计算方法，推导了描述准线性传输系统传输过程的数值计算模型，介绍了一种经济有效的、色散管理结合脉冲预展宽的非线性补偿方案。经过预展宽后，输出端鬼脉冲的强度仅为预展宽前的1/4。计算结果表明，该方案可有效抑制IFWM，获得理想的补偿效果，对今后高速光纤通信系统的设计具有一定的指导意义。

Intrachannel Four-Wave Mixing (IFWM) is one of the major nonlinearities affecting the signal transmission quality of high-bit-rate long-range dispersion management quasi-linear fiber-optic transmission systems. In this paper, a numerical calculation model is derived for describing the transmission process of quasi-linear fiber-optic transmission systems by adopting the Split-Step Fourier Method (SSFM) and a nonlinear compensation scheme for an economical and effective dispersion management in combination with pulse pre-broadening. After that, the intensity of the ghost pulse at the output end is just a quarter of that before the pre-broadening. Calculation results indicate that this scheme effectively suppresses IFWM, obtains ideal compensation effects and has a certain guiding significance for the design of high-rate fiber-optic communication systems in the future.