The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 14, 1997
Filed:
Aug. 22, 1995
Applicant:
Inventors:
Hideaki Okayama, Tokyo, JP;
Masao Kobayashi, Tokyo, JP;
Assignee:
Oki Electric Industry Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385 11 ; 385-7 ; 385-9 ; 385 14 ; 385 16 ;
Abstract
An optical wavelength filter has a polarizer, an analyzer, and an optical waveguide, formed in a substrate displaying an acousto-optic effect, that guides light from the polarizer to the analyzer. A transducer formed on the substrate excites a surface acoustic wave, thus creating an acoustic beam. The amplitude of the surface acoustic wave is small at the two sides of the acoustic beam and larger in the middle. The optical waveguide enters the acoustic beam at a point on one of the two sides of the beam, then moves into the center of the beam, and exits the beam at another point on one of the two sides.