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Abstract

An acousto-optic waveguide comprises a cladding region comprising a first material having a first refractive index and a first acoustic velocity, and a pair of optical waveguide layers embedded in and extending through the cladding region. The optical waveguide layers are separated from one another by a gap region comprising the first material. The optical waveguide layers each comprise a second material having a second refractive index that is higher than the first refractive index and a second acoustic velocity that is higher than the first acoustic velocity. The optical waveguide layers substantially confine acoustic waves that are generated during optical signal propagation through the acousto-optic waveguide. The acoustic waves are substantially confined to the area around the optical waveguide layers and the gap region along the direction of the optical signal propagation.

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