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:
Sep. 30, 2008
Filed:
Mar. 22, 2007
Hiroshi Miyata, Kawasaki, JP;
Yukito Tsunoda, Kawasaki, JP;
Tadao Nakazawa, Kawasaki, JP;
Yumi Nakazawa, Zama, JP;
Hiroshi Miyata, Kawasaki, JP;
Yukito Tsunoda, Kawasaki, JP;
Tadao Nakazawa, Kawasaki, JP;
Yumi Nakazawa, Zama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An acousto-optic device is disclosed which can achieve both of suppression of secular change and prevention of device damage and can maintain a stabilized wavelength selection filtering operation. The acousto-optic device includes a substrate on which a SAW guide for guiding a surface acoustic wave and an optical waveguide for guiding an optical wave are provided. A pyro-electricity coping conductive wiring pattern is provided in a region of the substrate other than the SAW guide and neutralizes polarization charge generated on a surface of the substrate.