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. 28, 2026
Filed:
Apr. 14, 2023
Sumitomo Electric Industries, Ltd., Osaka, JP;
Sumitomo Electric Optifrontier Co., Ltd., Yokohama, JP;
Shigehiro Nagano, Osaka, JP;
Takemi Hasegawa, Osaka, JP;
Takahiro Suganuma, Osaka, JP;
Hirotaka Sakuma, Osaka, JP;
Jun Kinugasa, Yokohama, JP;
SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka, JP;
Sumitomo Electric Optifrontier Co., Ltd., Yokohama, JP;
Abstract
An optical amplification transmission line of the present disclosure reduces a connection loss between an EDF located upstream of a signal light path and a SMF located downstream of the path, as compared with a conventional optical amplification transmission lines. The optical amplification transmission line includes an EDF and a SMF fusion-spliced to each other. The EDF has an Er-doped core and an F-doped cladding. A core of the SMF is doped with no Er. The ratio (MFD2/MFD1) of the MFD2 of a stationary section of the SMF to the MFD1 of a stationary section of the EDF falls within a range of 1.9 or more and 2.2 or less.