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:
Oct. 30, 2012
Filed:
Jun. 01, 2012
Tetsuya Nakanishi, Yokohama, JP;
Fumiaki Satou, Yokohama, JP;
Katsuyuki Aihara, Yokohama, JP;
Hiroshi Miyano, Yokohama, JP;
Takashi Sasaki, Yokohama, JP;
Tetsuya Nakanishi, Yokohama, JP;
Fumiaki Satou, Yokohama, JP;
Katsuyuki Aihara, Yokohama, JP;
Hiroshi Miyano, Yokohama, JP;
Takashi Sasaki, Yokohama, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
An optical fiber that has a small bending loss can be securely prevented from being fractured due to accidental bending during installation or other operations. The optical fiber includes a core, a first cladding, a second cladding, and a third cladding. The relative refractive index difference Δof the core is in the range of 0.3% to 0.38%, the relative refractive index difference Δof the first cladding is equal to or smaller than 0%, and the relative refractive index difference Δof the second cladding is in the range of −1.8% to −0.5%. The inner radius rand the outer radius rof the second cladding satisfy the expression '0.4r+10.5<r<0.2r+16', and the inner radius rof the second cladding is equal to or greater than 8 μm.