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:
Jul. 03, 2012
Filed:
May. 14, 2009
Seiji Kojima, Hitachi, JP;
Kanako Suzuki, Hitachi, JP;
Yoshihiro Nakatani, Hitachi, JP;
Toshihiko Ishikawa, Hitachi, JP;
Takao Nishikawa, Tokyo, JP;
Kojiro Ito, Tokyo, JP;
Tetsuya Sueoka, Yokohama, JP;
Seiji Kojima, Hitachi, JP;
Kanako Suzuki, Hitachi, JP;
Yoshihiro Nakatani, Hitachi, JP;
Toshihiko Ishikawa, Hitachi, JP;
Takao Nishikawa, Tokyo, JP;
Kojiro Ito, Tokyo, JP;
Tetsuya Sueoka, Yokohama, JP;
Hitachi Cable, Ltd., Tokyo, JP;
Advanced Cable Systems Corp., Tokyo, JP;
NTT Communications Corporation, Tokyo, JP;
Abstract
A communication light detecting device interconnecting light transmission paths and collocated therebetween, comprises: an optical coupling body including a core portion for photo coupling with the light transmission paths, and a light extracting portion for extracting a part of the communication light as a leakage light; and a light detecting portion having a light receiving member for receiving the leakage light. The light extracting portion is preferable to possess a lower refractive index than that of the core portion. Besides, the light extracting portion is preferable to include a light detecting use groove with a groove width of 50 μm or more and 140 μm or less formed by cutting and separating the core portion. Besides, the light extracting portion is preferable to be the optical coupling body in which outer diameter of the core portion is different from the outer diameter of a core of the light transmission path.