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:
Aug. 25, 2009
Filed:
May. 23, 2008
Hirofumi Aota, Kawasaki, JP;
Kohei Shibata, Kawasaki, JP;
Tamotsu Akashi, Kawasaki, JP;
Tsuyoshi Yamamoto, Kawasaki, JP;
Naoki Hashimoto, Kawasaki, JP;
Hirofumi Aota, Kawasaki, JP;
Kohei Shibata, Kawasaki, JP;
Tamotsu Akashi, Kawasaki, JP;
Tsuyoshi Yamamoto, Kawasaki, JP;
Naoki Hashimoto, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical switch switches ports through which a beam is input and output and includes an optical system through which the beam passes; a movable reflector that is enclosed in a casing and reflects, at a variable angle, the beam that has passed through the optical system; and a transmissive window that is disposed in the casing at a position through which the beam passes, is made of a uniaxial crystal, and obtains a phase difference with respect to the beam passing therethrough having a wavelength λ. The phase difference is λ/4 times a positive odd integer and results from a setting of an orientation of a crystal axis and a thickness of the transmissive window.