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:
Aug. 14, 2018
Filed:
Aug. 30, 2017
Sumitomo Electric Industries, Ltd., Osaka-shi, Osaka, JP;
Keisei Morita, Yokohama, JP;
Yoshinori Yamamoto, Yokohama, JP;
SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka-shi, Osaka, JP;
Abstract
A low attenuation optical fiber having a core doped with Ge is offered. The optical fiber consists of a glass part and a covering part formed around the glass part. The glass part is made of silica glass and includes: a Ge-doped center core region; an optical cladding layer formed around the center core region; and an optical cladding layer formed around the cladding layer. The relationship of Δ1>Δ3≥Δ2 holds, where Δ1, Δ2, and Δ3 are the relative refractive index differences of the center core region, the cladding layer, and the cladding layer, respectively with respect to pure silica glass. The average outer diameter of the glass part is in the range of 125±0.5 μm in the longitudinal direction, and 3σ is in the range of 0.1 μm to 0.5 μm, where σ is the standard deviation of the outer diameter in the longitudinal direction.