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Efficient and broadband subwavelength grating coupler for 3.7 mu m mid-infrared silicon photonics integration

Chen, NanDong, Bowei
Luo, Xianshu
Wang, Hong
Singh, Navab
Lo, Guo-Qiang
Lee, Chengkuo
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Abstract
A grating coupler is an essential building block for compact and flexible photonics integration. In order to meet the increasing demand of mid-infrared (MIR) integrated photonics for sensitive chemical/gas sensing, we report a silicon-on-insulator (SOI) based MIR subwavelength grating coupler (SWGC) operating in the 3.7 μm wavelength range. We provide the design guidelines of a uniform and apodized SWGC, followed by numerical simulations for design verification. We experimentally demonstrate both types of SWGC. The apodized SWGC enables high coupling efficiency of −6.477 dB/facet with 3 dB bandwidth of 199 nm, whereas the uniform SWGC shows larger 3dB bandwidth of 263.5 nm but slightly lower coupling efficiency of −7.371 dB/facet.
Keywords
Science & Technology, Physical Sciences, Optics, INSULATOR WAVE-GUIDES, INTERLEAVED TRENCHES
Source Title
OPTICS EXPRESS
Publisher
OPTICAL SOC AMER
Series/Report No.
Organizational Units
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Date
2018-10-01
DOI
10.1364/OE.26.026242
Type
Article
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