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. 17, 2013
Filed:
Jul. 02, 2010
Youko Yamanashi, Tokyo, JP;
Shigeto Matsumoto, Tokyo, JP;
Youko Yamanashi, Tokyo, JP;
Shigeto Matsumoto, Tokyo, JP;
Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
An optical fiber for optical amplification has: a core portion doped with at least erbium and aluminum; a cladding portion formed around the core portion and having a refractive index smaller than that of the core portion; a peak value of absorption coefficient of 35 dB/m or greater at a wavelength around 1530 nanometers; normal dispersion characteristics and an effective core area of 20 μmor larger, at a wavelength of 1550 nanometers; and a power conversion efficiency of a conversion from pumping light to amplified light having a wavelength of 1550 nanometers is 30% or more.