建立了孤子掺杂光纤放大的半经典模型，给出了分布放大透明传输的泵浦条件，详细讨论了激发态吸收的影响．文中结果为Ｅｒ￣３＋掺杂光纤孤子放大器的设计提供了重要理论依据． A semi-classical model of soliton-doped optical fiber amplification is established. The pumping conditions of distributed amplification and transparent transmission are given. The influence of excited state absorption is discussed in detail. The results in this paper provide an important theoretical basis for the design of Er ~ 3 + doped fiber soliton amplifiers.