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:
Sep. 26, 2017
Filed:
Mar. 23, 2017
Fujikura Ltd., Tokyo, JP;
Takayuki Kitamura, Sakura, JP;
Sho Endo, Sakura, JP;
Tatsuya Kishi, Sakura, JP;
Ryo Maruyama, Sakura, JP;
FUJIKURA LTD., Tokyo, JP;
Abstract
An optical fiber including a core and a cladding including an inner cladding layer and an outer cladding layer is provided. The refractive index of the core Δ1, the refractive index of the inner cladding layer Δ2, and the refractive index of the outer cladding layer Δ3 have a relationship denoted by the following expressions: Δ1max>Δ2min and Δ1max>Δ3, and 0.01%<|Δ2min−Δ3|<0.03%. An outer circumference radius r1 of the core, an outer circumferential radius r2 of the inner cladding layer, and an outer circumferential radius r3 of the outer cladding layer have a relationship denoted by the following expressions: r1<r2<r3, and 0.2≦r1/r2≦0.5. A cable cut-off wavelength λcc 1260 nm or less. A mode field diameter at a wavelength of 1310 nm is 8.6 μm or more and 9.5 μm or less.