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. 24, 2024
Filed:
Jan. 30, 2020
Applicant:
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Inventors:
Hirotaka Ono, Tokyo, JP;
Yutaka Miyamoto, Tokyo, JP;
Assignee:
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 6/02 (2006.01); G02B 6/028 (2006.01); H01S 3/067 (2006.01);
U.S. Cl.
CPC ...
G02B 6/028 (2013.01); H01S 3/067 (2013.01);
Abstract
An amplification fiber includes a core which is doped with an erbium ion and a cladding which surrounds the core and has a refractive index lower than a refractive index of the core, and a relative refractive index difference Δnbetween the core and the cladding is not more than a smaller one of values of a relative refractive index difference Δnexpressed as a predetermined expression related to a radius a of the core and a relative refractive index difference Δnexpressed as a predetermined expression related to the radius a of the core.