Light modular and recording device employing same

Details Light modular and recording device employing same Light modular and recording device employing same

1990-09-25

1992-08-11

LaRoche, Eugene R.

Optical: systems and elements

Optical modulator

Light wave directional modulation

359312, 359311, 385 7, 358 63, 358201, G02F 133, G02F 1335, H04N 914

Patent

active

051384825

ABSTRACT:
A light modulator includes an interdigital transducer having a plurality of interdigital electrode fingers for generating surface elastic waves having respective different frequencies in an optical waveguide. The electrode fingers are oriented in different directions to enable the generated surface elastic waves to diffract a light beam guided through the optical waveguide, while satisfying the Bragg condition for diffraction. A driver applies high-frequency voltages having respective frequencies to the electrode fingers to generate the surface elastic waves, respectively. The application of the high-frequency voltages to the electrode fingers is turned on and off by switching circuits. The light modulator is incorporated in a recording device.

REFERENCES:
patent: 4470661 (1984-09-01), Matsumoto
patent: 4595253 (1986-06-01), Yamashita et al.
patent: 4929044 (1990-05-01), Arimoto et al.
patent: 4992858 (1991-02-01), Kobayashi
Integrated Optics; T. Tamir, 1975 Table of Contents, pp. 13-31 and 83-93 no dates or authors or clear indication of source.
Guided-Wave Acoustooptic Bragg Modulators for Wide-Band Integrated Optic Communications and Signal Processing; Chen S. Tsai, 1979 IEEE Transactions on Circuits and Systems, vol. CAS-26, No. 12, Dec. 1979.

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