基于速率方程理论对低重复频率高功率脉冲抽运Er-Yb共掺光纤放大器(EYDFA)进行了理论研究。通过采用有限差分法对理论模型的求解,系统分析了在放大自发辐射(ASE)受限情况下,抽运脉冲峰值功率、抽运脉宽、信号时延对放大器性能的影响。结果表明,在将ASE控制在合理范围的情况下,抽运脉冲存在一个最佳的抽运脉冲宽度,信号脉冲相对抽运脉冲的时延对输出峰值功率和脉冲能量有非常重要的影响。而且对给定的增益介质,抽运脉冲峰值功率也并非越高越好,而是存在一个最佳值。该研究结果对高功率脉冲抽运Er-Yb共掺光纤放大器的实验研究具有指导意义。 Based on the rate equation theory, a theoretical study on the low repetition rate high power pulse pumping Er-Yb co-doped fiber amplifier (EYDFA) was carried out. The influence of pump pulse peak power, pumping pulse width and signal delay on the performance of the amplifier is systematically analyzed by using the finite difference method to solve the theoretical model. The results show that there is an optimum pumping pulse width for pumping pulses when the ASE is controlled within a reasonable range. The delay of the pumping pulses relative to the pumping pulse has a very important effect on the output peak power and pulse energy. And for a given gain medium, the pump pulse peak power is not as high as possible, but there is an optimal value. The results of this study are instructive for the experimental study of high power pulsed Er-Yb co-doped fiber amplifier.