High-efficiency focusing grating coupler with optimized ultra-short taper

doi:10.1088/1674-1056/23/11/114206

Abstract

A novel high-efficiency focusing non-uniform grating coupler is proposed to couple light into or off silicon photonic chips for large-scale silicon photonic integration. This kind of grating coupler decreases the transition length of the linking taper between the grating and the single-mode waveguide by at least 80%. The radian of the grating lines and the size of the taper are optimized to improve the coupling efficiency. An experimental coupling efficiency of ～ 68% at 1556.24 nm is obtained after optimization and the whole size of the grating is 12 μm × 30 μm, with a very short taper transition of ～ 15 μm long.

Keywords: grating coupler silicon photonics photonic integrated circuits silicon-on-insulator

Received: 08 April 2014
Revised: 06 June 2014
Accepted manuscript online:

PACS:	42.82.Et	(Waveguides, couplers, and arrays)
	42.79.Dj	(Gratings)
	42.79.Wc	(Optical coatings)

Fund:

Project supported by the National Basic Research Program of China (Grant No. 2011CB301701), the National High Technology Research and Development Program of China (Grant No. 2012AA012202), the Main Direction Program of Knowledge Innovation of the Chinese Academy of Sciences (Grant No. KGCX2-EW-102), and the National Natural Science Foundation of China (Grant Nos. 61107048 and 61275065).

Corresponding Authors: Yu Yu-De
E-mail: yudeyu@semi.ac.cn

Cite this article:

Yang Biao (杨彪), Li Zhi-Yong (李智勇), Yu Yu-De (俞育德), Yu Jin-Zhong (余金中) High-efficiency focusing grating coupler with optimized ultra-short taper 2014 Chin. Phys. B 23 114206

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