Optical deflector and scanning optical system provided with the

Details Optical deflector and scanning optical system provided with the Optical deflector and scanning optical system provided with the

1996-10-29

1998-09-08

Ngo, John

Optical waveguides

Directional optical modulation within an optical waveguide

Acousto-optic

385 10, 385 37, 385130, G02B 610

Patent

active

058057439

ABSTRACT:
An optical deflector which has a waveguide, an interdigital transducer which is provided on the waveguide to convert a high-frequency signal to excite surface acoustic waves, a light incidence section for making a light beam incident to the waveguide and a light emergence section for making a light beam progressing in the waveguide emergent therefrom, and a scanning optical system provided with the optical deflector. The interdigital transducer is a chirp type and has finger electrodes which are so designed that an emergent light beam from the optical deflector will have a substantially fixed intensity in a deflection range. More specifically, the finger electrodes of the interdigital transducer are overlap-weighted so that an emergent light beam from the optical deflector will have a substantially fixed intensity in a deflection range. It is possible that the finger electrodes of the interdigital transducer have fixed widths and intervals thereamong at a portion which excites surface acoustic waves with a end frequency portion of a frequency band. Also, the interdigital transducer may have smaller variation in intervals of the finger electrodes at a portion which excites surface acoustic waves with a end frequency portion of a frequency band than at a portion which excites surface acoustic waves with a central frequency portion of the frequency band.

REFERENCES:
patent: 4693548 (1987-09-01), Tsunoi
patent: 4707059 (1987-11-01), Ogura et al.
patent: 4815802 (1989-03-01), Nakamura
patent: 4929042 (1990-05-01), Hatori et al.
patent: 4929044 (1990-05-01), Arimoto et al.
Hartmann et al., "Impulse Model Design of Acoustic Surface-Wave Filters", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-21, No. 4, Apr. 1973, pp. 162-175.

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