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针对多信道放大时掺铒光纤放大器（ＥＤＦＡ）的增益谱随饱和深度而变化的现象，本文介绍了ＥＤＦＡ增益谱在等效饱和条件下的双波长和宽谱光源迭代测试法及等效饱和信号功率的计算公式．使用这种方法只需少数几次迭代即可准确测出当ＥＤＦＡ应用于波分复用系统时各信道的实际增益，实验测得结果的误差不大于０１５ｄＢ．
Aiming at the phenomenon that the gain spectrum of EDFA changes with the saturation depth when multi-channel amplification, this paper introduces the dual-wavelength and wide-spectrum iterative test method of EDFA gain spectrum under equivalent saturation conditions and the equivalent saturation signal Power calculation formula. With this method, the actual gain of each channel when EDFA is applied to a wavelength division multiplexing system can be accurately measured with only a few iterations. The error of the experimentally measured result is not more than 0,15 dB.