研究大信号工作状态下的Er3 + Yb3 + 共掺磷酸盐玻璃波导放大器的增益与量子转换效率。从量子转换效率的定义出发 ,得出了增益、抽运光功率以及量子转换效率三者之间关系的解析表达式。通过数值求解大信号工作状态下的Er3 + Yb3 + 共掺系统的速率方程与光功率传输方程 ,讨论了Er3 + 浓度、Yb3 + 浓度、Yb3 + 与Er3 + 浓度比率、抽运光功率以及放大器长度等因素对量子转换效率的影响。结果表明提高Er3 + 浓度与增加放大器长度均有助于提高量子转换效率 ,高Er3 + 浓度掺杂需要相应的高Yb3 + 浓度与之相匹配以减小由于高浓度Er3 + 掺杂引起的上转换效应 ,Yb3 + 浓度的提高将降低器件的量子转换效率 ,Yb3 + Er3 + 浓度之比取 1～ 2较好。 The gain and quantum efficiency of Er3 + Yb3 + co-doped phosphate glass waveguide amplifier under large signal are studied. Starting from the definition of quantum conversion efficiency, the analytical expression of the relationship between gain, pump power and quantum efficiency is obtained. The rate equations of Er3 + Yb3 + codoped system and optical power transmission equations are numerically solved. The effects of Er3 + concentration, Yb3 + concentration, Yb3 + / Er3 + concentration ratio, pump power and amplifier length And other factors on the quantum conversion efficiency. The results show that increasing the concentration of Er3 + and increasing the length of the amplifier all contribute to the improvement of the quantum efficiency. High Er3 + doping requires a corresponding high Yb3 + concentration to reduce the upconversion due to high concentration Er3 + doping Effect, Yb3 + concentration will reduce the quantum efficiency of the device, Yb3 + Er3 + concentration ratio of 1 to 2 is better.