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. 12, 2006
Filed:
Jan. 15, 2003
Takeo Komiya, Yokohama, JP;
Takashi Sasaki, Yokohama, JP;
Yasushi Fujimura, Yokohama, JP;
Tsukuru Katsuyama, Yokohama, JP;
Naoyuki Yamabayashi, Yokohama, JP;
Takeo Komiya, Yokohama, JP;
Takashi Sasaki, Yokohama, JP;
Yasushi Fujimura, Yokohama, JP;
Tsukuru Katsuyama, Yokohama, JP;
Naoyuki Yamabayashi, Yokohama, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A planar optical waveguide is formed with an optical circuit having an inclined groove. A reflection filter is installed on the inside of the inclined groovecrossing a plurality of optical waveguides. Reflected light from the reflection filter is detected by an array of photodetectors to monitor the optical intensity of the signal light. The photodetector array is held by a sub-mounting substrate disposed at the top side of the optical circuit so that a mounting face of the photodetector array is inclined at an angle a (0°<α<90°) with respect to the top surface of the optical circuit such that the reflected light from the reflection filter is made incident onto a light incident face of the photodectors at a predetermined angle φ. The optical waveguide module is capable of monitoring the optical intensity correctly regardless of the polarization state of the signal light.