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

作　　者：杨彪 李智勇 俞育德 余金中 

机构地区：[1]State Key Laboratory for Integrated Optoelectronics, Institute of Semiconductors,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2014年第11期344-347,共4页中国物理B（英文版）

基　　金：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);the National Natural Science Foundation of China(Grant Nos.61107048 and 61275065)

摘　　要：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.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.

关 键 词：grating coupler silicon photonics photonic integrated circuits SILICON-ON-INSULATOR 

分 类 号：TN622[电子电信—电路与系统] O224[理学—运筹学与控制论]