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. 08, 2003
Filed:
Feb. 02, 1999
Yasushi Koyano, Kanagawa, JP;
Eisuke Sasaoka, Kanagawa, JP;
Shigeru Tanaka, Kanagawa, JP;
Kohei Kobayashi, Kanagawa, JP;
Masashi Onishi, Kanagawa, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
After a wide-band DCF is wound around a bobbin to form an optical fiber coil , the latter is removed from the bobbin and placed into a bundle state (the state where the increase in transmission loss in the wavelength band of 1.55 &mgr;m caused by distortions in winding is reduced by 0.1 dB/km or more) released from distortions in winding. A resin is used as a coil-tidying member so as to secure the optical fiber coil to a storage case at four positions. Both ends of the optical fiber coil are connected to pigtail fibers at fusion-splicing parts ; respectively. Even when the storage case is closed with a lid after the optical fiber coil is secured to the storage case with the resin , there remain interstices within the bundle of the optical fiber coil and a space between the optical fiber coil and the storage case . As a result, even when the optical fiber coil in a bundle state is accommodated in the storage case , transmission loss and the like would not increase.