强激光与粒子束
彊激光與粒子束
강격광여입자속
HIGH POWER LASER AND PARTICLEBEAMS
2011年
7期
1794-1798
,共5页
矩阵方法%大模场啁啾光纤光栅%耦合模理论%切趾函数
矩陣方法%大模場啁啾光纖光柵%耦閤模理論%切趾函數
구진방법%대모장조추광섬광책%우합모이론%절지함수
matrix method%chirped LMA FBG%coupled mode theory%apodization function
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.
將一種矩陣算法拓展應用于數值求解多模耦閤模微分方程,併使用該矩陣算法對大模場啁啾光纖光柵的光譜特性進行瞭理論研究.結果錶明,大模場多模光纖光柵因模式的自耦閤和互耦閤而使反射譜存在多箇反射峰,這與單模光纖光柵的反射譜不同.由于光柵週期存在啁啾,大模場光纖光柵的反射峰分裂,且峰值反射率減小.使用高斯切趾函數可使反射峰分裂在一定程度上得到改善.
장일충구진산법탁전응용우수치구해다모우합모미분방정,병사용해구진산법대대모장조추광섬광책적광보특성진행료이론연구.결과표명,대모장다모광섬광책인모식적자우합화호우합이사반사보존재다개반사봉,저여단모광섬광책적반사보불동.유우광책주기존재조추,대모장광섬광책적반사봉분렬,차봉치반사솔감소.사용고사절지함수가사반사봉분렬재일정정도상득도개선.
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.
