透射体布拉格光栅选择性的研究  

Study on transmitting volume-based Bragg grating selectivity

作　　者：李松柏[1] 

机构地区：[1]长江师范学院物理学与电子工程学院,重庆408100

出　　处：《光通信研究》2011年第4期45-47,共3页Study on Optical Communications

基　　金：重庆市教委科技基金资助项目(KJ091307)

摘　　要：基于Kogelnik耦合波理论,推导了透射体布拉格光栅(VBG)的衍射效率方程,并用数值仿真分析了折射率调制度、晶体厚度与VBG的角度和波长选择性的关系。结果表明:当入射光满足布拉格条件时,厚度为2.0 mm、折射率调制度为250×10-6的VBG衍射效率为100%;当入射光的波长、角度偏离布拉格条件一个很小量时,VBG衍射效率迅速下降;当偏离量超出一定范围时,衍射效率降低为0。On the basis of the Kogelnik＇s coupled-wave theory,the diffraction efficiency equation of transmitting Volume Body Grating（VBG） is derived.The dependence of the angle and wavelength selectivity of the VBG on the refractive index modulation and crystal thickness are analyzed by numerical simulation.The results indicate that when the incident light satisfies the Bragg condition,the refractive efficiency of a 2-mm-thick VBG with a 250×10-6 refractive index modulation is 100%,while when the incident light deviates the Bragg condition for a very small quantity,the VBG diffraction efficiency drops rapidly and when the deviation quantity surpasses a certain scope,the diffraction efficiency reduces to zero.

关 键 词：透射体布拉格光栅 耦合波理论 偏移量 衍射效率 

分 类 号：TN253[电子电信—物理电子学]