Vertically integrated As2S3 ring resonator on LiNbO3.
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Titanium-diffused lithium niobate (Ti:LiNbO3) waveguides are widely used in current fiber optic networks because of their high-speed, electro-optic modulation, and low-loss integration with standard single-mode fibers. However, they cannot achieve small ring resonators owing to their lack of a high core-to-cladding index contrast. To overcome this challenge, we vertically integrate an emerging chalcogenide glass waveguide technology on well-established Ti:LiNbO3 waveguides. We present, to our knowledge, the first arsenic trisulfide (As2S3) race-track ring resonator with a 290.8 m bend radius in an all-pass filter configuration, integrated on a Ti:LiNbO3 waveguide. Vertical coupling is achieved using a unique taper design. Experimental results are shown for 10.6% coupling, 2.08 dB roundtrip loss, and a 25.4 GHz free-spectral range. 2009 Optical Society of America.