采用分段逐步计算，结合快速傅立叶变化，计算群速色散和自相位调制在光纤中对所传输的飞秒脉冲的影响。-Using split-step computation, combined with Fast Fourier Transform Algorithm, calculated the influence to transmission of the femtosecond pulse about the group velocity dispersion and the phase modulation in the fiber.