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. 09, 2005
Filed:
Apr. 17, 2003
Michiko Takushima, Yokohama, JP;
Tomomi Sano, Yokohama, JP;
Hiroshi Suganuma, Yokohama, JP;
Tatsuhiko Tanaka, Yokohama, JP;
Michiko Takushima, Yokohama, JP;
Tomomi Sano, Yokohama, JP;
Hiroshi Suganuma, Yokohama, JP;
Tatsuhiko Tanaka, Yokohama, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
An optical signal processing apparatus has a diffraction grating element, first condenser lens, Faraday rotation elements, polarization beam splitter, λ/2 plate, second condenser lens, third condenser lens, and diffraction grating element. The magnitude of a magnetic field of each of the Faraday rotation elements is controlled on the basis of an externally input control signal. The rotation angle of the plane of polarization of signal light is set to 0 or λ/2 in accordance with the magnitude of the magnetic field. Each Faraday rotation element receives signal light having wavelengths λto λ, which has arrived from the first condenser lens, and outputs the signal light as a polarized light component in the first azimuth (parallel to the z-axis direction) or second azimuth (parallel to the y-axis direction).