Title :
High Efficiency and Broadband Two-Dimensional Blazed Grating Coupler With Fully Etched Triangular Holes
Author :
Qin, Kun ; Gao, Dingshan ; Bao, Changjing ; Zhao, Zhe ; Zhou, Xu ; Lu, Tingting ; Chen, Lin
Author_Institution :
Wuhan Nat. Lab. for Optoelectron., Huazhong Univ. of Sci. & Technol., Wuhan, China
fDate :
7/15/2012 12:00:00 AM
Abstract :
A 2-D blazed grating coupler with fully etched triangular holes to realize high efficient and broadband coupling between silicon-on-insulator nanowaveguide and fiber is proposed. By changing the lateral width of a triangular hole along propagating direction in each single grating period gradually according to effective medium theory, a high coupling efficiency of -2.78 dB and an extremely large 1 dB bandwidth of 180 nm are achieved simultaneously. By optimizing the buried oxide thickness from 2 to 1.83 μm, the coupling efficiency can be further improved to -2.18 dB and 1 dB bandwidth is enlarged to 290 nm.
Keywords :
diffraction gratings; etching; integrated optics; optical couplers; optical waveguides; silicon-on-insulator; broadband 2D blazed grating coupler; broadband coupling; buried oxide thickness; coupling efficiency; effective medium theory; fully etched triangular holes; propagating direction; silicon-on-insulator nanowaveguide; size 1.83 mum to 2 mum; Bandwidth; Couplers; Couplings; Gratings; Indexes; Optical waveguides; Silicon; Blazing; grating coupler; high efficiency; wideband;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2012.2198431
