【摘要】 针对非线性特性对光纤布拉格光栅禁带的影响进行了研究;对光栅在非线性作用下所呈现的Bragg波长偏移特性作了理论分析。仿真结果表明,随着输入信号功率的增大,光栅的布拉格波长向长波方向移动,反射峰值下降,反射带宽变窄。基于此原理提出了一种新的全光可调谐滤波方案,并对不同光栅参数下的输出波形和反射谱特性进行了比较。该方案通过控制光实现了对光纤布拉格光栅固有波长的调节,从而实现了全光可调谐滤波,仿真结果表明脉冲形状保持良好。更多还原

【Abstract】 In this paper, the nonlinearity-induced Bragg wavelength shift on the Bragg wavelength of fiber grating is simulated. It shows that, with the increase of the input power, the Bragg wavelength shiftes to infared wave band, the peak value of the reflection decreases, and the width of the reflection gap narrows. A novel tunable filter scheme based on the nonlinearity is presented. The effects of the main filter Bragg grating (FBG) parameters on the output waveshape and spectrum are analyzed. This all-optical filter is tuned by the input pump power. The results shows that the waveshape of the pulse keeps well.更多还原