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中文摘要：
光纤喇曼放大器（FRA）系统中的偏振相关增益（PDG）降低光纤通信系统的传输性能,因此研究FRA系统中PDG的特性和如何降低FRA系统中的PDG成为FRA系统应用中的一项重要内容。论述了FRA的基本原理,总结了有关PDG的理论研究和实验研究,详细分析了降低FRA中偏振相关增益的几种方法,对FRA偏振相关增益的进一步研究方向进行了展望。
英文摘要：
The transmission performance of the optical fiber communication system is degraded by the polarization dependent gain（PDG）in fiber Raman amplifiers（FRA）.The study of characteristics of the PDG in fiber Raman amplifiers and methods to reduce the PDG is very important in the optical fiber communication field.The basic principle of fiber Raman amplifiers is discussed.The analytical and experimental studies of the PDG are summarized.The ways of degrading PDG in FRA are detailed analyzed.The research tendencies of the PDG in RFA are proposed.
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