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Chin. Phys. B, 2016, Vol. 25(8): 084212    DOI: 10.1088/1674-1056/25/8/084212

Apodized grating coupler using fully-etched nanostructures

Hua Wu(武华)1,2, Chong Li(李冲)1, Zhi-Yong Li(李智勇)3, Xia Guo(郭霞)1,4
1 Photonic Device Research Laboratory, College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing 100124, China;
2 College of Physics and Electronic Information, GanNan Normal University, Ganzhou 341000, China;
3 State Key Laboratory for Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
4 School of Science, Minzu University of China, Beijing 100081, China
Abstract  A two-dimensional apodized grating coupler for interfacing between single-mode fiber and photonic circuit is demonstrated in order to bridge the mode gap between the grating coupler and optical fiber. The grating grooves of the grating couplers are realized by columns of fully etched nanostructures, which are utilized to digitally tailor the effective refractive index of each groove in order to obtain the Gaussian-like output diffractive mode and then enhance the coupling efficiency. Compared with that of the uniform grating coupler, the coupling efficiency of the apodized grating coupler is increased by 4.3% and 5.7%, respectively, for the nanoholes and nanorectangles as refractive index tunes layer.
Keywords:  grating couplers      equivalent refractive index      mode matching      coupling efficiency     
Received:  31 October 2015      Published:  05 August 2016
PACS:  42.79.Dj (Gratings)  
  42.79.Gn (Optical waveguides and couplers)  
  42.82.Et (Waveguides, couplers, and arrays)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61222501, 61335004, and 61505003), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20111103110019), the Postdoctoral Science Foundation of Beijing Funded Project, China (Grant No. Q6002012201502), and the Science and Technology Research Project of Jiangxi Provincial Education Department, China (Grant No. GJJ150998).
Corresponding Authors:  Xia Guo     E-mail:

Cite this article: 

Hua Wu(武华), Chong Li(李冲), Zhi-Yong Li(李智勇), Xia Guo(郭霞) Apodized grating coupler using fully-etched nanostructures 2016 Chin. Phys. B 25 084212

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