非对称包层调制型布拉格光栅  

Cladding-Modulation Bragg Grating with Asymmetric Structure

作　　者：刘春娟[1] 杨超山 连乐[1] 徐晓瑞[1] 胡延伟[1] 

机构地区：[1]兰州交通大学电子与信息工程学院,甘肃兰州730070

出　　处：《光学学报》2017年第5期44-49,共6页Acta Optica Sinica

基　　金：甘肃省自然科学基金(1610RJZA046);甘肃省建设科技攻关项目(216094);甘肃省高等学校科研项目(216132)

摘　　要：为了优化光栅性能,提出一种基于互补金属氧化物半导体兼容性制造工艺的非对称包层调制光栅结构。该结构通过调整光栅齿的位置来改变波导中传输光的耦合率,最终达到改善光栅的反射带宽、消光比、输出功率等性能参数的目的。利用耦合模理论分析了该改进型光栅结构对光栅耦合率、反射带宽及输出性能的影响,同时利用有限元方法进行了数值仿真。结果表明,该改进型光栅的反射带宽由0.9nm减小到0.3nm,消光比的绝对值从29.2dB增加到35.1dB,耗散到包层的光功率从5.99×10^(-5) W减小到3.13×10^(-5) W;该改进型光栅器件性能得到改善。In order to optimize the performance of gratings, one cladding-modulation grating with an asymmetric structure is proposed based on the complementary metal oxide semiconductor compatibility fabrication technique. By adjusting the position of grating teeth, the coupling efficiency of the transmission light in the waveguide is altered, which eventually achieves the improvements of reflection bandwidth, extinction ratio and output power of the grating. The effect of the improved grating structure on coupling coefficient, reflection bandwidth and output performance of gratings is analyzed by using the coupled mode theory, and the numerical simulation is conducted as well with the finite element method. The results show that the reflection bandwidth of the improved grating is reduced from 0.9 nm to 0.3 nm, the absolute value of the extinction ratio is increased from 29.2 dB to 35.1 dB, and the optical power dissipating in the claddings is decreased from 5. 99 × 10-5 W to 3. 13 × 10-5 W. The performance of the improved grating device is improved.

关 键 词：光栅 硅基光学 布拉格光栅 耦合模理论 有限元数值仿真 窄带反射 

分 类 号：TN256[电子电信—物理电子学]