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:
Dec. 22, 2009
Filed:
Mar. 11, 2008
Tsuyoshi Yamamoto, Kawasaki, JP;
Tamotsu Akashi, Kawasaki, JP;
Kohei Shibata, Kawasaki, JP;
Hirofumi Aota, Kawasaki, JP;
Shinji Yamashita, Kawasaki, JP;
Tsuyoshi Yamamoto, Kawasaki, JP;
Tamotsu Akashi, Kawasaki, JP;
Kohei Shibata, Kawasaki, JP;
Hirofumi Aota, Kawasaki, JP;
Shinji Yamashita, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A wavelength selective switch of the present invention angularly disperses lights output from a plurality of input ports of an input and output optical system, to an X-direction, according to wavelength, by a diffraction grating to supply the dispersed lights to a condenser lens. The condenser lens is arranged so that a center axis thereof is shifted to the X-direction relative to an axis passing through the center of spreading angle to the X-direction of output beams from the diffraction grating, and accordingly, at a non-operating time, the light of each wavelength passed through the condenser lens is incident on each movable mirror being tilted by an offset angle corresponding to a shift amount of the condenser lens. As a result, it becomes possible to block the connection between an input side and an output side at the non-operating time without degrading the performance at an operating time.