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:
Dec. 25, 2012
Filed:
Apr. 25, 2008
Masashi Ikeda, Sakura, JP;
Naritoshi Yamada, Sakura, JP;
Kuniharu Himeno, Sakura, JP;
Michihiro Nakai, Sakura, JP;
Tomoharu Kitabayashi, Sakura, JP;
Masashi Ikeda, Sakura, JP;
Naritoshi Yamada, Sakura, JP;
Kuniharu Himeno, Sakura, JP;
Michihiro Nakai, Sakura, JP;
Tomoharu Kitabayashi, Sakura, JP;
Fujikura Ltd., Tokyo, JP;
Abstract
A rare earth-doped core optical fiber of the present invention includes a core comprising a silica glass containing at least aluminum and ytterbium, and a clad provided around the core and comprising a silica glass having a lower refraction index than that of the core, wherein the core has an aluminum concentration of 2% by mass or more, and ytterbium is doped into the core at such a concentration that the absorption band which appears around a wavelength of 976 nm in the absorption band by ytterbium contained in the core shows a peak absorption coefficient of 800 dB/m or less.