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:
Apr. 23, 2002
Filed:
Sep. 13, 2000
Tsunetoshi Saito, Tokyo, JP;
Toshihiko Ohta, Tokyo, JP;
The Furukawa Electric Co., Ltd, Tokyo, JP;
Abstract
A plate-shaped member ( ) whose linear expansion coefficient is larger than that of a substrate ( ) is provided on the rear side of the substrate ( ) of an arrayed waveguide diffraction grating ( ) which divides, by a diffraction effect of an array waveguide ( ), lights of a plurality of wavelengths from those having a plurality of wavelengths different from each other, which are inputted from an optical input waveguide ( ), and outputs these lights from the respective optical output waveguides ( ). A light transmission feature of the respective output lights includes a light transmission feature for causing lights to be transmitted, centering around the center wavelengths of light transmission, which are different from each other, wherein the center wavelengths of light transmission shifts to the long wavelength side by a temperature rise.