基于广义Ginzburg-Landau方程,研究了超短脉冲在光纤放大器正、反常色散区的传输特性,着重分析了增益带宽对脉冲传输和放大的影响。结果表明窄的增益带宽延缓脉冲的波形变化,限制脉冲的放大,扭曲频谱形状,降低频谱展宽的速率并减少频谱展宽的饱和值。 Based on the generalized Ginzburg-Landau equation, the propagation characteristics of ultrashort pulses in the positive and anomalous dispersion regions of optical fiber amplifiers are studied. The effects of gain bandwidth on the pulse propagation and amplification are analyzed emphatically. The results show that the narrow gain bandwidth delays the waveform changes of the pulse, limits the amplification of the pulse, distorts the shape of the spectrum, reduces the rate of spectrum broadening, and reduces the saturation of the spectrum broadening.