Optical waveguide recording medium playing apparatus

Details Optical waveguide recording medium playing apparatus Optical waveguide recording medium playing apparatus

1991-11-29

1993-08-03

Dzierzynski, Paul M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4422, 369 4412, 369100, 372 12, G11B 509

Patent

active

052335828

ABSTRACT:
Disclosed is an optical waveguide recording medium playing apparatus which has a heterodyne detection optical system and uses a waveguide light delaying/reflecting device for a reference light generating optical system. This waveguide light delaying/reflecting device is provided with a transducer which is disposed in close proximity of an optical waveguide where light is guided and which generates a surface elastic wave, so that the surface elastic wave may propagate in the light propagating direction of the optical waveguide. A laser beam is guided on the otpical waveguide, and a high-frequency drive current modulated in a burst form is applied to an electrode to generate a surface elastic wave, thereby accomplishing the shifting and phase delay of the light frequency of the reference light which ensures information reproduction with the interaction with the laser beam and the surface elastic wave. This optical waveguide is formed by diffusing Ti, Rb or the like on a substrate of GaAs, SiO.sub.2, or TeO.sub.2. This waveguide light delaying/reflecting device can impart phase shifting of several times the wavelength A .lambda. to ensure information reading from along waveguide.

REFERENCES:
patent: 4862440 (1989-08-01), Miyamoto et al.
Patent Abstracts of Japan, unexamined applications, P field, vol. 14, No. 508, Nov. 7, 1990.
The Patent Office Japanese Government, p. 6 p 1128, Kokai-No. 2-210 627 (Naohiro Tanno).

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