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Chin. Opt. Lett.
 Home  List of Issues    Issue 03 , Vol. 17 , 2019    10.3788/COL201917.030501

Grating coupler efficiency enhancement by double layer interference
Huashan Yang1;2, Fuling Zhang3, Lemeng Leng1;2, Zhaobang Zeng1;2, Yue Shao1;2, Hui Zhang3, Nan Yang1;2, and Xiangning Chen4
1 College of Engineering and Applied Sciences, [Nanjing University], Nanjing 210093, China
2 Key Laboratory of Intelligent Optical Sensing and Manipulation of Ministry of Education, [Nanjing University], Nanjing 210093, China
3 [The 27th Research Institute of China Electronics Technology Group Corporation], Zhengzhou 450047, China
4 School of Electronic Science and Engineering, [Nanjing University], Nanjing 210093, China

Chin. Opt. Lett., 2019, 17(03): pp.030501

Topic:Diffraction and gratings
Keywords(OCIS Code): 050.2770  350.2770  310.6845  

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.

Copyright: © 2003-2012 . This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Posted online:2019/2/28

Get Citation: Huashan Yang, Fuling Zhang, Lemeng Leng, Zhaobang Zeng, Yue Shao, Hui Zhang, Nan Yang, and Xiangning Chen, "Grating coupler efficiency enhancement by double layer interference," Chin. Opt. Lett. 17(03), 030501(2019)

Note: 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.


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