Apodized grating coupler using fully-etched nanostructures

doi:10.1088/1674-1056/25/8/084212

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
Revised: 18 January 2016
Accepted manuscript online:

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: guo@bjut.edu.cn

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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