本文的第一章对EDFA的发展背景作了概述。列举了与其类似的光纤放大器的特

点；重点阐述了EDFA的发展过程以及使EDFA获得广泛应用的各项优点；分析了EDFA

当前的发展方向，并简要叙述了本文的研究内容。

-This article first chapter on the development of EDFA outlined the background. Cited similar fiber amplifier and its characteristics　focuses on the development process of EDFA and EDFA is widely available so that the merits of　an analysis of the current direction of development of EDFA, and a brief descr iption of the contents of this study.