高效垂直耦合的光栅耦合器设计  

Design of High Efficiency Grating Coupler for Vertical Coupling

作　　者：武华[1,2] 郭霞[1] 韩明夫[1] 

机构地区：[1]北京工业大学电子信息与控制工程学院光子器件研究实验室,北京100124 [2]赣南师范学院物理与电子信息学院,江西赣州341000

出　　处：《光子学报》2013年第7期777-781,共5页Acta Photonica Sinica

基　　金：国家优秀青年科学基金(No.61222501);高等学校博士学科点专项科研基金(No.20111103110019)资助

摘　　要：利用反射式光栅和分布布喇格反射镜的反射特性,分别从光栅耦合器的侧面和底部对光进行高反射,通过合理选取反射光栅和耦合光栅的间距使两组光栅的反射光实现相消干涉来减弱耦合光栅在实现垂直耦合时存在的负二阶反射,从而设计出高效率垂直耦合的光栅耦合器.采用本征模展开方法,模拟计算了垂直耦合光栅耦合器的耦合效率随不同结构参量而变化的相关特性,在绝缘体硅平面波导和单模光纤之间对波长1 550nm的光获得了最高89%的耦合效率.所得结果对实际垂直耦合光栅耦合器的制备具有一定参考价值.A high-efficiency grating coupler is designed for vertical coupling between silicon-on- insulator waveguides and single-mode fibers. The reflection eharacteristics of reflector grating and distributed bragg reflector are employed to obtain a high reflection from the right side and bottom of the coupler. The reflected light is interfered destructively to reduce the negative second-order reflection by selecting a reasonable spacing between the reflector grating and the coupler grating when the coupler grating is in the vertical coupling. The coupler is optimized using eigenmode expansion-based simulations. The highest coupling efficiency of 89% at a wavelength 1 550 nm is achieved by simulation. The results provide some useful references for the fabrication of the actual vertical coupling grating coupler.

关 键 词：光栅耦合器 绝缘体硅 本征模展开 耦合效率 

分 类 号：TN256[电子电信—物理电子学]