Polarization diversity two-dimensional grating coupler on x-cut lithium niobate on insulator  

作　　者：Renyou Ge Hao Li Ya Han Lifeng Chen Jian Xu Meiyan Wu Yongqing Li Yannong Luo Xinlun Cai 葛仁友;李昊;韩雅;陈力锋;徐健;吴美燕;黎永青;罗砚浓;蔡鑫伦(State Key Laboratory of Optoelectronic Materials and Technologies,School of Electronics and Information Technology,Sun Yat-sen University,Guangzhou 510275,China;School of Economics and Commerce,South China University of Technology,Guangzhou 510640,China;Laboratory of Biomedical Photonics&Engineering,School of Basic Medical Sciences,Guangxi Medical University,Nanning 530021,China;Department of Physics,East Carolina University,Greenville,North Carolina 27858-4353,USA;Life Science Institute and Laboratory of Biomedical Photonics&Engineering,Guangxi Medical University,Nanning 530021,China)

机构地区：[1]State Key Laboratory of Optoelectronic Materials and Technologies,School of Electronics and Information Technology,Sun Yat-sen University,Guangzhou 510275,China [2]School of Economics and Commerce,South China University of Technology,Guangzhou 510640,China [3]Laboratory of Biomedical Photonics&Engineering,School of Basic Medical Sciences,Guangxi Medical University,Nanning 530021,China [4]Department of Physics,East Carolina University,Greenville,North Carolina 27858-4353,USA [5]Life Science Institute and Laboratory of Biomedical Photonics&Engineering,Guangxi Medical University,Nanning 530021,China

出　　处：《Chinese Optics Letters》2021年第6期23-27,共5页中国光学快报（英文版）

基　　金：supported in part by the National Key R&D Program of China(Nos.2019YFB1803900 and 2019YFA0705000);the National Natural Science Foundation of China(Nos.11690031,11761131001,and 11904061);the Key R&D Program of Guangdong Province(No.2018B030329001);the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program(No.2017BT01X121);the Project of Key Laboratory of Radar Imaging and Microwave Photonics,Ministry of Education(No.RIMP2019003);the Innovation Fund of WNLO(No.2018WNLOKF010),the Guangzhou Science and Technology Program(No.201707010096);the Guangxi Youth and Middle Aged Ability Promotion Project(No.2019KY0126);the BaGui Scholar Programof Guangxi Province(No.02304002022C);the China Postdoctoral Science Foundation(No.2020M673554XB).

摘　　要：We propose and demonstrate a polarization diversity two-dimensional grating coupler based on the lithium niobate on insulator platform, for the first time, to the best of our knowledge. The optimization design, performance characteristics,and fabrication tolerance of the two-dimensional grating coupler are thoroughly analyzed utilizing the three-dimensional finite-difference time-domain method. Experimentally,-7.2 d B of coupling efficiency is achieved with 1 d B bandwidth of64 nm. The polarization-dependent loss is about 0.4 d B around 1550 nm. Our work provides new polarization multiplexing approaches for the lithium niobate on insulator platform, paving the way for critical applications such as high-speed polarization multiplexed electro-optical modulators.

关 键 词：lithium niobate on insulator polarization diversity two-dimensional grating coupler 

分 类 号：TQ131.11[化学工程—无机化工] TN622[电子电信—电路与系统]