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. 23, 2008
Filed:
May. 23, 2007
Koji Terada, Kawasaki, JP;
Haruhiko Tabuchi, Kawasaki, JP;
Kohei Shibata, Kawasaki, JP;
Terukazu Naruse, Kawasaki, JP;
Koji Terada, Kawasaki, JP;
Haruhiko Tabuchi, Kawasaki, JP;
Kohei Shibata, Kawasaki, JP;
Terukazu Naruse, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical device enabling reducing device scale is constituted by M circulators (), (M being a natural number), a waveguide-type diffraction grating () including M first input/output waveguides () formed at its one end and M×N second input/output waveguides (-to-N and-to-N) formed at the other end, (N being a natural number), and paths from the M circulators being connected to the M first input/output waveguides; and N reflection-type optical switches (-to-N) each for reflecting the optical paths for M adjacent waveguides out of the M×N second input/output waveguides(-to-N and-to-N) and for switching over the returning-destination waveguide respectively, wherein the M circulators, the waveguide-type diffraction grating and N reflection-type optical switches are arranged in cascade. Consequently, the optical device can function preferably also as a wavelength selective optical switch available in a WDM transmission system.