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. 07, 2015
Filed:
Jan. 31, 2013
Furukawa Electric Co., Ltd., Tokyo, JP;
Nippon Telegraph and Telephone Corporation, Chiyoda-ku, JP;
Naomi Kumano, Tokyo, JP;
Iwao Shimotakahara, Tokyo, JP;
Ryuichi Sugizaki, Tokyo, JP;
Takeshi Yagi, Tokyo, JP;
Tomoya Shimizu, Ibaraki, JP;
Takashi Matsui, Ibaraki, JP;
Yukihiro Goto, Ibaraki, JP;
Toshio Kurashima, Ibaraki, JP;
Kazuhide Nakajima, Ibaraki, JP;
FURUKAWA ELECTRIC CO., LTD., Tokyo, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Abstract
A hole-assisted optical fiber includes a core portion and a cladding portion that includes an inner cladding layer, an outer cladding layer, and holes formed around the core portion. A diameter of the core portion is 3 μm to 9.8 μm, a relative refractive index difference of the core portion relative to the outer cladding layer is 0.11% to 0.45%, an outside diameter of the inner cladding layer is 53 μm or less, a relative refractive index difference of the inner cladding layer relative to the outer cladding layer is a negative value, −0.30% or more, a diameter of each hole is 2.4 μm to 4.0 μm, a hole occupancy rate is 17% to 48%, a bending loss at a wavelength of 1625 nm when bent at a radius of 5 mm is 1 dB/turn or less, and a cut-off wavelength is 1550 nm or less.