Convolution using guided acousto-optical interaction in As2S3 waveguides

Convolution of two acoustic surface waves (ASW) has been obtained by the acousto-optical diffraction of an optical wave in an As2S3 waveguide. A simple theory is presented to show the convolution process. Experimentally, very high acousto-optical diffraction efficiency (93% at 3 mW of acoustic power) has been observed in the As2S3 waveguide. A triangular pulse was observed on the oscilloscope through an optical heterodyne detector when two rectangular ASW pulses were convolved with each other.