中文摘要：

利用理论推导总结了频率啁啾的概念,以非线性薛定谔方程为基础,用数值模拟方法研究了群速度色散（GVD）和自相位调制（SPM）作用下啁啾的产生以及对光脉冲传输的影响,得出了GVD和SPM两种效应所致啁啾的产生机理不同,其结果对于光纤中脉冲传输特性的研究具有重要的意义。

英文摘要：

The concept of frequency chirp was summarized by theoretical deduction,and on the basis of the nonlinear Schrdinger Equation,the generation of chirp with the influence of group velocity dispersion（GVD）and self phase modulation（SPM）and its effect on the pulse propagation were studied by numerical simulation.The results show that the different generation mechanisms of chirp can be obtained by two kinds of effects of GVD and SPM.The results are important for the study of optical pulse transmission characteristics in optical fibers.