沿传输方向浓度渐变掺铒光纤放大器的模型

The Impact of Stimulated Raman Seattering in “WDM+EDFA” System

提出了两种掺铒浓度渐变的分布式光纤放大器（ｄ－ＥＤＦＡ）模型：沿传输方向，掺杂浓度单调线性下降与掺杂浓度线性由大到小，由小到大两次变化的ｄ－ＥＤＦＡ，用传输方程研究了不同渐变系数下，ｄ－ＥＤＦＡ的各种特性。

This paper derives a general expression to calculated the power penalty of Stimulated Raman scattering (SRS) in 'WDM+EDFA' system, and analyzes some factors may influence the SRS. The conclusion is reached that the damage to the 'WDM+EDFA' system caused by SRS depends greatly on the disposal of the EDFAs, and an easy way is proposed to minify the damage. Finally, the expressions are given to estimate the upper transmission distance and the number of EDFAs limited by SRS in 'WDM+EDFA' system.