21 April 2006 High-efficiency diffraction grating coupler for multimode optical interconnect
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Abstract
The device presented in this paper is designed for coupling a free space optical wave under quasi-normal incidence in and out of a highly multimode waveguide with high efficiency. It uses two resonant diffraction gratings at the substrate-waveguide interface that are made of a shallow metal grating, covered with a high refractive index layer. It is shown that the resonant structure can theoretically diffract up to 90% of the incident energy in and out of the waveguiding layer. The geometrical parameters of the structure and the tolerances can easily be achieved by conventional technology means.
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Janyce Franc, Nathalie Destouches, Danièle Blanc, Jean-Claude Pommier, Svetlen Tonchev, Geert Van Steenberge, Nina Hendrickx, Arndt Last, Olivier Parriaux, "High-efficiency diffraction grating coupler for multimode optical interconnect", Proc. SPIE 6185, Micro-Optics, VCSELs, and Photonic Interconnects II: Fabrication, Packaging, and Integration, 61851F (21 April 2006); doi: 10.1117/12.666710; https://doi.org/10.1117/12.666710
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