给出了一种分析分布式掺铒光纤放大器的理论方法，可以对放大器的信号增益和泵浦吸收进行分析，并能够为分布式掺铒光纤放大器的设计提供理论依据。通过推导得出了基本公式，并就一些特殊情况作了讨论。该方法适用于1480 nm和980 nm泵浦的放大器系统。

This peper offered a theoretical method for the analysis of distributed EDFA' s,which can analyze the signal gain and pump absorption of the amplifiers. With it, we can carry out the optimal design for distributed EDFA's. We derived the basic formula, and discussed it under some special conditions. This method is suited for amplifier systems pumped at 1480 nm and 980 nm bands.