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大模场啁啾光纤光栅的光谱特性
Spectral characteristics of chirped fiber Bragg gratings in large-mode-area fibers
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摘要: 将一种矩阵算法拓展应用于数值求解多模耦合模微分方程,并使用该矩阵算法对大模场啁啾光纤光栅的光谱特性进行了理论研究.结果表明,大模场多模光纤光栅因模式的自耦合和互耦合而使反射谱存在多个反射峰,这与单模光纤光栅的反射谱不同.由于光栅周期存在啁啾,大模场光纤光栅的反射峰分裂,且峰值反射率减小.使用高斯切趾函数可使反射峰分裂在一定程度上得到改善.Abstract: A matrix method is extended to solve the multimode coupling differential equations,and thereby the spectral characteristics of the chirped Bragg gratings in large-mode-area fibers (LMA FBGs) are studied theoretically.Unlike those of Bragg gratings in single mode optical fibers (SM FBGs),the reflection spectra of chirped LMA FBGs contain self-coupling and co-coupling peaks of the existing modes.For the chirped LMA FBGa,the reflectivity decreases and the reflection peaks split.These splits can be improved on some degree by Gaussian apodization function.
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