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. 15, 2025
Filed:
Feb. 07, 2023
Sumitomo Electric Industries, Ltd., Osaka, JP;
Tetsuya Hayashi, Osaka, JP;
SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka, JP;
Abstract
The MCF of the present disclosure suppresses XT and leakage loss at 1.565 μm or 1.625 μm for bidirectional communication. The MCF comprises 12 core units each including a core and a depressed layer, a common cladding, and a resin coating. The units are arranged so that no adjacent relationship is established between cores each having an adjacent relationship with a specific core selected from the units, and are arranged so that centers of the units are line symmetric with a symmetry axis intersecting with the central axis and passing through none of the centers of the units. The resin coating's diameter is 250±15 μm, an effective area at 1.550 μm is 70 μmor more, and a 22 m-length cable cutoff wavelength is 1.530 μm or less. A center-to-center interval between adjacent cores, a shortest distance from the core center to the cladding interface, and a cladding's diameter satisfy specific conditions.