An interaction between longitudinal or shear bulk acoustic waves and guided optical waves has been observed in single-mode and multimode polyurethane and sputtered glass optical waveguides. This interaction produces a number of effects — namely, mode conversion, amplitude modulation, and phase modulation — depending upon whether shear or longitudinal sound is present. Mode conversion between TE and TM waveguide modes occurs with shear sound; longitudinal sound produces amplitude and phase modulation of the guided light. The bulk acoustic wave effect offers promise for producing high-data-rate integrated optical modulators.
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Brandt et al. (1973) studied this question.
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