中文摘要：

论述了EDFA增益平坦化的主要方法,全面介绍了国内外光纤放大器增益平坦化的研究进展和成果,并对其优劣势进行了分析比较,提出了EDFA增益平坦技术的发展趋势。另外,还介绍了一种利用全局搜索算法来优化设计自身增益平坦EDFA这一较为新颖的方法。

英文摘要：

In this paper,methods of gain flattening were compared and achievements of EDFA in the world are expounded overall.Then,a development trend of gain flattening technology is proposed.In addition,a new method of using global optimization search algorithm to optimize gain-flatten EDFA is specific shown and analyzed.