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:
Mar. 04, 2008
Filed:
Nov. 28, 2005
Hiroshi Miyata, Kawasaki, JP;
Yukito Tsunoda, Kawasaki, JP;
Hiroshi Miyata, Kawasaki, JP;
Yukito Tsunoda, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In an optical wavelength tunable filter (AOTF) using an acousto-optic effect of the present invention, there is provided a single SAW waveguide which propagates a surface acoustic wave generated by an IDT along respective arm portions of an optical waveguide. The SAW waveguide is formed with a pair of low sound-velocity areas having a curved belt shape, in which a mode distribution of a propagating SAW is changed symmetrically with respect to a straight line as an axis passing through the middle of the respective arm portions, while keeping the sound velocity of the SAW constant. As a result, wavelength dependence and polarization dependence of the filter property, and an increase in sidelobe level, generated due to weighting of the SAW intensity, can be suppressed.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile