An Efficient Silicon Grating Coupler for a 2 μm Waveband Based on a Polysilicon Overlay

Yifan Wu; Yuzhou Wu; Jiefeng Xu; Xi Wang; You Wu; Yanglin Chen; Jiahang Li; Ke Xu

doi:10.3390/photonics10080952

Photonics (Aug 2023)

An Efficient Silicon Grating Coupler for a 2 μm Waveband Based on a Polysilicon Overlay

Yifan Wu,
Yuzhou Wu,
Jiefeng Xu,
Xi Wang,
You Wu,
Yanglin Chen,
Jiahang Li,
Ke Xu

Affiliations

Yifan Wu: Department of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen 518055, China
Yuzhou Wu: Department of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen 518055, China
Jiefeng Xu: Department of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen 518055, China
Xi Wang: Department of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen 518055, China
You Wu: Department of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen 518055, China
Yanglin Chen: Department of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen 518055, China
Jiahang Li: Department of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen 518055, China
Ke Xu: Department of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen 518055, China

DOI: https://doi.org/10.3390/photonics10080952
Journal volume & issue: Vol. 10, no. 8
p. 952

Abstract

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The short-wavelength mid-infrared spectral range of the 2 μm waveband has the advantages of low transmission loss and broad gain bandwidth, making it a promising candidate for the next optical fiber communication window. It is thus highly desired to develop high-performance silicon photonic components in this waveband. Here, an efficient dual-layer grating coupler was designed on a 220 nm thick silicon-on-insulator based on raised polysilicon to address the low directionality issue. For the fiber tilted at an angle of 10°, the grating coupler’s simulated coupling efficiency reaches 80.3% (−0.95 dB) at a wavelength of 2002 nm. The 1 dB bandwidth is 66 nm. The structure is completely compatible with the standard silicon photonic fabrication process, making it suitable for large volume fabrication.

Published in Photonics

ISSN: 2304-6732 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics
Website: http://www.mdpi.com/journal/photonics

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