Surface acoustic wave generating apparatus including a positive feedback- type generator

摘要

A surface acoustooptic wave deflector comprises: a thin film optical wave guide path; an input photocoupler for guiding a light onto the optical guidewave path from the outside; at least one surface acoustic wave exciting device for exciting a surface acoustic wave which is transmitted in the optical waveguide path, a part of this surface acoustic wave crossing the light which is transmitted in the optical waveguide path and deflecting the light due to an acoustooptical effect; at least one surface acoustic wave receiving device provided in the transmitting path of the surface acoustic wave which is excited by the surface acoustic wave exciting device; at least one external circuit including an amplifier, this external circuit forming a closed loop together with the exciting device and the wave receiving device and constituting a positive feedback type generator; and an output photo coupler for outputting the transmitted light to the outside.