对单模光纤正群速色散区皮秒啁啾脉冲的非线性传输进行了近似的解析分析和定量的数值计算.结果表明，负啁啾脉冲在传输过程中能得到有效压缩。压缩比与脉冲初始峰值功率和初始啁啾程度有关。初始峰值功率一定的脉冲，其压缩比随初始啁啾程度的增大而增大，初始啁啾程度一定的脉冲，压缩比随初始峰值功率的增大而减小，表明自相位调制效应导致脉冲压缩效果变差.计算结果还表明，在脉冲时域宽度得到压缩的同时，光谱宽度也能得到同步压缩.

The nonlinear propegation of picosecond chirped pulses in the normal dispersionregime of single-mode fibers is considered both analytically and numerically. The resultsshow that downchirped pulses can be compressed owing to normal group-velocitydispersion. The compression depends both on the initial peak power and on the initialfrequency chirp of the input pulses. We also show that self-phase-modulation degradespulse compression and that, as the pulse compresses temporally, it synchronously experiences a spectral narrowing.