基于阶跃长周期光栅级联的EDFA增益平坦

EDFA Gain-flattening Based on the Cascade of Step-changed LPGs

两级联阶跃型长周期光栅已经被研究作为带阻滤波器实现了EDFA的增益平坦。在对这种长周期光栅进行分析后,提出了一种利用三级联或更多级联的长周期光栅来优化光纤传输谱线的新方法。在此基础上,根据长周期光栅耦合模理论,进行了传输谱线的计算与仿真。仿真结果显示,光栅传输图谱可以被塑造成合适的形状来优化传输;同时,通过对级联光栅的两个参数(级联光栅各段的长度以及折射率微扰)的调制,有效谱线可以得到展宽。经过论证得出,这种方法是实现EDFA增益平坦的一条可行的途径,为EDFA在光通信和WDM光纤传感网络系统中应用的优化提供了理论依据。

By analyzed the two-step cascaded step-changed LPGs which have been already used as band filters for flattening the gain of erbium-doped fiber amplifiers(EDFAs),an improved method of introducing three or more steps cascade has been advanced in order to optimize the transmission spectra of the filters.The calculation and simulation,based on coupled-mode theory,of the cascaded LPGs transmission spectra are given.The simulation results show that the transmission spectral profile can be tailored into an adopti...