Vertically integrated As2S3 ring resonator on LiNbO3

• Published in: Optics letters Vol. 34; no. 11; p. 1735
• Main Authors: Solmaz, Mehmet E, Adams, Donald B, Tan, Wee C, Snider, William T, Madsen, Christi K
• Format: Journal Article
• Language: English
• Published: United States 01.06.2009
• ISSN: 0146-9592
• DOI: 10.1364/OL.34.001735

Titanium-diffused lithium niobate (Ti:LiNbO(3)) 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:LiNbO(3) waveguides. We present, to our knowledge, the first arsenic trisulfide (As(2)S(3)) race-track ring resonator with a 290.8 microm bend radius in an all-pass filter configuration, integrated on a Ti:LiNbO(3) 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.