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8 February 2008 High-index-contrast chalcogenide waveguides
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Recent work on vertically-integrated electro-optic and chalcogenide waveguides is reviewed. By integrating As2S3 chalcogenide glass with Ti-diffused lithium-niobate (LiNbO3) waveguides, we are able to dramatically increase the integration density for this electro-optic waveguide platform. As2S3 offers a higher refractive index compared to the LiNbO3 and consequently enables low-loss, small-bend-radii structures that are crucial for making high density optical circuits. As2S3 waveguides are patterned on top of LiNbO3 waveguides. Adiabatic tapers are used to couple light from the LiNbO3 waveguide into the As2S3 waveguide. Bend radii that are less than a hundred microns are enabled using this approach, compared to LiNbO3 waveguide bend radii that are typically on the order of a centimeter. The design and fabrication are discussed along with experimental results for s-bend structures.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christi K. Madsen, Mehmet Solmaz, and Robert Atkins "High-index-contrast chalcogenide waveguides", Proc. SPIE 6897, Optoelectronic Integrated Circuits X, 689703 (8 February 2008);

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