GUIDED-WAVE ACOUSTOOPTIC BRAGG-DIFFRACTION IN INDIUM GALLIUM-ARSENIDEPHOSPHIDE WAVE-GUIDES

Theoretical and experimental studies on guided-wave acousto-optic (AO) Bragg diffraction in a composite indium gallium arsenide phosphide (I nGaAsP) planar waveguide were carried out. In this letter, the experim ental results of the excitation and propagation of a [110]-directed su rface acoustic wave (SAW) at the center frequency of 167 MHz, and the AO Bragg diffraction at a 1.31 micron wavelength in In0.22Ga0.78As0.47 P0.53 waveguide are reported. An AO Bragg diffraction efficiency as hi gh as 14% was achieved at an acoustic drive power of 8.5 mW with an in teraction length (transducer aperture) of only 1.0 mm. Two orders of m agnitude improvement in the Bragg diffraction efficiency versus rf dri ve power should be achievable by the optimization of the SAW transduce r and the optical waveguide parameters. (C) 1997 American Institute of Physics.