报道了利用光纤中的自相位调制(SPM)效应对微结构光纤的非线性系数进行测量的实验。实验中采用半导体激光器作为脉冲光源，输出宽度为1．6ps的双曲正割型脉冲，经掺铒光纤放大器(EDFA)放大后进入80m的色散平坦微结构光纤，由于自相位调制效应，出射光谱得到展宽。通过测量输入微结构光纤的脉冲峰值功率和输出光谱，可以计算得到微结构光纤的非线性系数。该测量方法简单、准确，实验测量值与光纤的标称值误差小于1%。

The measurement of nonlinear coefficient of microstructure fiber based on self-phase modulation(SPM)is experimentally demonstrated. A semiconductor laser with 1.6 ps hyperbolic secant shape pulses at a repetition rate of 10 GHz is used as light source. After amplified by the EDFA,the pulses are injected into an 80-m-long dispersion-flattened microstructure fiber. The output spectra of the pulses are broadened due to SPM. By measuring the peak power of the input pulse and the output spectrum,nonlinear coefficient of microstructure fiber can be calculated. This measurement method is simple and accurate,and the error between our experimental result and the measurement result supplied by the fiber producer is within 1%.