掺铒光纤放大器(EDFA)和拉曼放大器(FRA)的使用，使得光纤通信系统中的入纤功率有了很大的提高。

The implement applications of erbium doped fiber amplifier (EDFA) and fiber Raman amplifier (FRA) make the launching power in optical fiber communications systems increased significantly.

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本论文的主要内容有：1、介绍了掺铒光纤放大器的三能级结构，并推导了掺铒光纤放大器的原子速率方程和功率传输方程。

Introduce the three energy level of EDFA and deduce the rate equation for population changes and propagation equation for pump and signal beams.

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