应用于C波段的二维光栅耦合器的设计与优化  

Design and optimization of two-dimensional grating coupler applied to C-band

作　　者：何万才 耿敏明[1,2,3,4] 冯瑶 赖明彬 刘嫱 张振荣 HE Wancai;GENG Minming;FENG Yao;LAI Mingbing;LIU Qiang;ZHANG Zhenrong(School of Computer,Electronics and Information,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Multimedia Communications and Network Technology,Nanning 530004,China;Key Laboratory of Multimedia Communications and Information Processing of Guangxi Higher Education Institutes,Nanning 530004,China;Guangxi Experiment Center of Information Science,Guilin Guangxi 541004,China)

机构地区：[1]广西大学计算机与电子信息学院,南宁530004 [2]广西多媒体通信与网络技术重点实验室,南宁530004 [3]广西高校多媒体通信与信息处理重点实验室,南宁530004 [4]广西信息科学实验中心,广西桂林541004

出　　处：《光通信技术》2023年第4期8-14,共7页Optical Communication Technology

基　　金：国家自然科学基金项目(61965003、61661004、61741504)资助;广西自然基金项目(2018GXNSFAA294133)资助。

摘　　要：针对二维光栅耦合器存在耦合效率低、偏振相关损耗大、结构复杂等问题,提出了一种应用于C波段的基于绝缘体上硅(SOI)材料的新型二维光栅耦合器,该耦合器由具有45°倾角的四孔交错菱形刻蚀晶胞单位周期排列组成,采用倾斜耦合方式对耦合器的周期、刻蚀深度、刻蚀圆孔的相对位置、刻蚀圆孔半径进行优化,并对其进行仿真验证。仿真结果表明:该耦合器在1540 nm处耦合损耗低至-2.4 dB,C波段的偏振相关损耗低于0.2 dB,1、3 dB工作带宽分别是36、58 nm。Aiming at the problems of low coupling efficiency,large polarization related loss and complex structure of two-dimensional grating couplers,a new two-dimensional grating coupler based on silicon on insulator(SOI)material applied in C band is proposed.The coupler is composed of four hole staggered rhombic etching cell unit cycle arrangement with a 45°incli-nation angle.The period,etching depth,relative position and radius of etching circular hole of the coupler are optimized by using inclined coupling mode,and conduct simulation verification on it.The simulation results show that the coupling loss of the coup-ler is as low as-2.4 dB at 1540 nm,the polarization related loss at C band is less than 0.2 dB,and the 1 dB and 3 dB operating bandwidths are 36 dB and 58 nm respectively.

关 键 词：二维光栅耦合器 倾斜耦合 耦合效率 偏振相关损耗 绝缘体上硅 温度不敏感 

分 类 号：TN252[电子电信—物理电子学]