通过数值模拟，分析了脉冲离散效应对单模光纤正群速色散区基于暗孤子交叉相位调制的脉冲压缩的影响，并提出了减轻这种影响的办法。作者发现，即使暗孤子与被压缩脉冲的中心波长相差很小，离散效应对脉冲压缩的影响也很大。离散效应不仅导致脉冲压缩比的减小和压缩后脉冲峰值功率的降低，而且还导致脉冲压缩所需最佳光纤长度的增加以及压缩后的脉冲呈现不对称性。还发现，若采取本文提出的非同步耦合法，则可以明显地弥补离散效应对脉冲压缩的影响，从而有效地改善脉冲压缩效果 Through numerical simulation, the influence of pulse dispersion on the pulse compression based on dark phase soliton cross-phase modulation in the positive group velocity dispersion of single-mode fiber is analyzed and the way to mitigate this effect is proposed. The authors found that even though the difference between the dark soliton and the center wavelength of the compressed pulse is very small, the effect of the discrete effect on the pulse compression is large. The discrete effect results not only in a reduction of the pulse compression ratio and a reduction of the peak power of the pulse after compression, but also leads to an increase in the optimum optical fiber length required for pulse compression and asymmetry of the compressed pulse. It is also found that if the asynchronous coupling method proposed in this paper is adopted, the effect of discrete effect on pulse compression can be obviously compensated and the effect of pulse compression can be effectively improved