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:
Jan. 05, 1993
Filed:
Dec. 10, 1990
Nobuo Tomita, Ibaraki, JP;
Takashi Nakamura, Shiga, JP;
Hidetoshi Takasugi, Saitama, JP;
Hideki Suzuki, Kanagawa, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
The present invention discloses a fault distinguishing device for establishing whether fault exists in an optical fiber cable and in another optical system. The disclosed device is intermediate between the optical fiber cable and the another optical system and optically coupled with the optical fiber cable and the another optical system. The disclosed device is composed of at least one intrinsic optical fiber and at least one optical filter. The optical filter is internal to a corresponding intrinsic optical fiber, and forms an angle of between 0 and 4.7 degrees inclusive with respect to a plane perpendicular to the longitudinal axis of the intrinsic optical fiber, such that the optical fiber is cable of reflecting a first light component and of transmitting a second light component. The first light component and the second light component differ from one another in terms of wavelength.