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本文在分析一些文献的基础上，仿照掺Ｅｒ￣（３＋）光纤放大器的理论模型，尝试建立了一个Ｅｒ￣（３＋）／Ｙｂ￣（３＋）双掺光纤放大器的理论模型。利用本模型，可以模拟双掺光纤中信号、泵浦及放大的自发辐射（ＡＳＥ）的变化情形，并得到一些有意义的数值结果。
Based on the analysis of some literatures, a theoretical model of an Er¯ (3 +) / Yb¯ (3+) double-doped fiber amplifier is built on the theoretical model of Er¯ (3+) fiber amplifier. Using this model, we can simulate the variation of signal, pump and amplified spontaneous emission (ASE) in double-doped fiber and get some meaningful numerical results.