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. 04, 2017
Filed:
Mar. 07, 2016
Fujikura Ltd., Tokyo, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Osaka Prefecture University Public Corporation, Sakai-shi, Osaka, JP;
Tsukasa Hosokawa, Sakura, JP;
Kentaro Ichii, Sakura, JP;
Katsuhiro Takenaga, Sakura, JP;
Shoichiro Matsuo, Sakura, JP;
Hirotaka Ono, Atsugi, JP;
Makoto Yamada, Sakai, JP;
FUJIKURA LTD., Tokyo, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
OSAKA PREFECTURE UNIVERSITY PUBLIC CORPORATION, Sakai-Shi, Osaka, JP;
Abstract
An optical fiber for amplification includes a core having an inner core and an outer core surrounding the outer circumferential surface of the inner core. The relative refractive index difference of the inner core to a cladding is smaller than the relative refractive index difference of the outer core to the cladding. The outer core is entirely doped with erbium. The theoretical cutoff wavelength of an LPmode light beam is a wavelength of 1,565 nm or more. The theoretical cutoff wavelength of an LPmode light beam is a wavelength of 1,530 nm or less. The theoretical cutoff wavelength of the LPmode light beam is a wavelength of 980 nm or less.