Surface acoustic wave generating apparatus including a positive

Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network

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350 9614, 350358, 333145, 340712, G02B 610, H03H 900, G09G 302, G02F 111

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active

048158020

ABSTRACT:
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.

REFERENCES:
patent: 3655621 (1972-04-01), Chang
patent: 3850503 (1974-11-01), Riseberg et al.
patent: 4055821 (1977-10-01), Wagers et al.
patent: 4063198 (1977-12-01), Wagers et al.
patent: 4315693 (1982-02-01), Walker
patent: 4470661 (1984-09-01), Matsumoto
patent: 4530573 (1985-07-01), Wolkstein
patent: 4604707 (1986-08-01), Yamashita et al.
'"Surface Wave Device and Application Thereof", Nikkan Kogyo Shinbunsha, Dec. 1978, pp. 183-185 (Japanese with English Translation).
"Study of C/N of SAW-VCO", Electronic Communication Society Overall National Meeting, 1980, pp. 1-91 (Japanese with English Translation).
"Broadband Modified Chirp Transducers", by Joseph et al, Jan. 1980, Conference: Integrated and Guided-Wave Optics, Technical Digest.

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