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Grating coupler efficiency enhancement by double layer interference

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Abstract

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.

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DOI:10.3788/col201917.030501

所属栏目:Diffraction and gratings

基金项目:The authors thank Prof. W. Jiang for helpful advice. This work was 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), and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

收稿日期:2018-10-19

录用日期:2018-12-20

网络出版日期:2019-02-28

作者单位    点击查看

Huashan Yang:College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, ChinaKey Laboratory of Intelligent Optical Sensing and Manipulation of Ministry of Education, Nanjing University, Nanjing 210093, China
Fuling Zhang:The 27th Research Institute of China Electronics Technology Group Corporation, Zhengzhou 450047, China
Lemeng Leng:College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, ChinaKey Laboratory of Intelligent Optical Sensing and Manipulation of Ministry of Education, Nanjing University, Nanjing 210093, China
Zhaobang Zeng:College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, ChinaKey Laboratory of Intelligent Optical Sensing and Manipulation of Ministry of Education, Nanjing University, Nanjing 210093, China
Yue Shao:College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, ChinaKey Laboratory of Intelligent Optical Sensing and Manipulation of Ministry of Education, Nanjing University, Nanjing 210093, China
Hui Zhang:The 27th Research Institute of China Electronics Technology Group Corporation, Zhengzhou 450047, China
Nan Yang:College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, ChinaKey Laboratory of Intelligent Optical Sensing and Manipulation of Ministry of Education, Nanjing University, Nanjing 210093, China
Xiangning Chen:School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China

联系人作者:Xiangning Chen(shining@ieee.org)

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引用该论文

Huashan Yang, Fuling Zhang, Lemeng Leng, Zhaobang Zeng, Yue Shao, Hui Zhang, Nan Yang, Xiangning Chen, "Grating coupler efficiency enhancement by double layer interference," Chinese Optics Letters 17(3), 030501 (2019)

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