Grating coupler efficiency enhancement by double layer interference  

Grating coupler efficiency enhancement by double layer interference

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作  者:Huashan Yang Fuling Zhang Lemeng Leng Zhaobang Zeng Yue Shao Hui Zhang Nan Yang Xiangning Chen 杨华山;张福领;冷乐蒙;曾昭邦;邵越;张辉;杨楠;陈相宁(College of Engineering and Applied Sciences, Nanjing University;Key Laboratory of Intelligent Optical Sensing and Manipulation of Ministry of Education, Nanjing University;The 27th Research Institute of China Electronics Technology Group Corporation;School of Electronic Science and Engineering, Nanjing University)

机构地区:[1]College of Engineering and Applied Sciences, Nanjing University [2]Key Laboratory of Intelligent Optical Sensing and Manipulation of Ministry of Education, Nanjing University [3]The 27th Research Institute of China Electronics Technology Group Corporation [4]School of Electronic Science and Engineering, Nanjing University

出  处:《Chinese Optics Letters》2019年第3期7-11,共5页中国光学快报(英文版)

基  金:supported by the National Key R&D Program of China (Nos. 2017YFA0303700 and 2017YFA0303704);the National Natural Science Foundation of China (Nos. 61775094 and 41427801);the Fundamental Research Funds for the Central Universities (No. 021314380072), ;the Priority Academic Program Development of Jiangsu Higher Education Institutions

摘  要:A simple method for improving grating couplers' coupling efficiency without any extra microfabrication processes is proposed. This method can improve the coupling efficiency with 1.69 dB by utilizing the combined interference in the cladding layer and air gap between the cladding surface and the paralleled angle polished fiber facet. The proposed method can be applied to various kinds of on-chip grating couplers. Back reflection,1 dB bandwidth, and fiber alignment tolerance have also been improved at the same time.A simple method for improving grating couplers' coupling efficiency without any extra microfabrication processes is proposed. This method can improve the coupling efficiency with 1.69 dB by utilizing the combined interference in the cladding layer and air gap between the cladding surface and the paralleled angle polished fiber facet. The proposed method can be applied to various kinds of on-chip grating couplers. Back reflection,1 dB bandwidth, and fiber alignment tolerance have also been improved at the same time.

关 键 词:GRATING COUPLER efficiency ENHANCEMENT DOUBLE LAYER INTERFERENCE 

分 类 号:O3[理学—力学]

 

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