Abstract
A fast acoustic diffraction-type thin-film optical waveguide modulator is described. Modulation was observed for the drive signal over the 150–550-MHz frequency range. A depth of modulation of 10% per electrical watt was estimated from the diffracted spots. The scheme presented here widens the selection of materials for acousto-optic modulations in an optical waveguide and may find some useful applications in the infrared region where suitable electro-optic materials are few.
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