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High Efficiency and Broadband Two-Dimensional Blazed Grating Coupler With Fully Etched Triangular Holes

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7 Author(s)
Kun Qin ; Wuhan Nat. Lab. for Optoelectron., Huazhong Univ. of Sci. & Technol., Wuhan, China ; Dingshan Gao ; Changjing Bao ; Zhe Zhao
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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.

Published in:

Lightwave Technology, Journal of  (Volume:30 ,  Issue: 14 )

Date of Publication:

July15, 2012

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