Authors:	S. Radosavljevic, B. Kuyken, G. Roelkens
Title:	Efficient 5.2 um wavelength fiber-to-chip grating couplers for the Ge-on-Si and Ge-on-SOI mid-infrared waveguide platform
Format:	International Journal
Publication date:	5/2017
Journal/Conference/Book:	Optics Express
Volume(Issue):	25(16) p.19034 - 19043
DOI:	10.1364/oe.25.019034
Citations:	26 (Dimensions.ai - last update: 17/11/2024) 24 (OpenCitations - last update: 27/6/2024) Look up on Google Scholar
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Abstract

We present the design, fabrication and characterization of efficient fiber-to-chip grating couplers on a Germanium-on-Silicon (Ge-on-Si) and Germanium-on-silicon-on-insulator (Ge-on-SOI) platform in the 5 μm wavelength range. The best grating couplers on Ge-on-Si and Ge-on-SOI have simulated coupling efficiencies of -4 dB (40%) with a 3 dB bandwidth of 180 nm and -1.5 dB (70%) with a 3 dB bandwidth of 200 nm, respectively. Experimentally, we show a maximum efficiency of -5 dB (32%) and a 3 dB bandwidth of 100 nm for Ge-on-Si grating couplers, and a -4 dB (40%) efficiency with a 3 dB bandwidth of 180 nm for Ge-on-SOI couplers.

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