切趾型非线性布拉格光纤光栅双稳开关及动态特性的理论研究  

Theoretical Investigation on Bistable Switching and Dynamic Characteristics of Tapered Nonlinear Bragg Gratings

作　　者：陈建军[1] 木拉提.哈米提 胡彦婷[1] 

机构地区：[1]新疆医科大学医学工程技术学院,新疆乌鲁木齐830011

出　　处：《激光与光电子学进展》2011年第1期62-66,共5页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(30960097);新疆科学技术厅新疆少数民族科技骨干人才特殊培养科研专项基金(200723104);新疆医科大学"科研创新基金"资助课题

摘　　要：基于耦合模方程,利用含有时间推移变量的传输矩阵方法对非线性布拉格光栅(NLBG)双稳特性进行了理论分析,结果表明:在稳态情况下,不同切趾参数对NLBG双稳开关的阈值影响不同,并且正负切趾具有明显的光隔离器特点。考虑连续波输入,NLBG表现出的双稳开关特性在动态情形下极易出现一定周期性的自脉动,而且当输入光强增大到临界光强,输出可由自脉动转变为混沌状态;考虑切趾参数一定时,耦合系数的增大会导致脉动基座宽度和频率减小,当耦合系数达到一定数值后,输出状态将转变为弛豫衰减振荡。Based on the coupled mode theory, by using the time-domain transfer matrix method, the bistable characteristics of nonlinear Bragg gratings （NLBG） are analyzed numerically. The results show that under steady case, various tapered factors have a different effects on the threshold switching energy and also positive and negative taper can cause the response of optical isolator in NLBG. On the other hand, with the continuous wave taken into consideration, the periodic self-pulsation may emerge extremely easy under the dynamic conditions in NLBG. As the input power increases to the critical intensity, the self-pulsation transforms into the chaos. For a certain tapered factor, the pulsation width and the frequency of the self-pulsation will reduce with the increase of coupling coefficient, but the output state will transform into relaxation damped oscillation when the coupling coefficient reaches a certain value.

关 键 词：光纤光学 双稳 自脉动 切趾 耦合系数 

分 类 号：TN253[电子电信—物理电子学]