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. 07, 2021
Filed:
Apr. 24, 2018
Fujikura Ltd., Tokyo, JP;
Masakuni Mimuro, Tokyo, JP;
FUJIKURA LTD., Tokyo, JP;
Abstract
An object is to improve the efficiency of amplification by rare earth ion while maintaining beam quality of output light in a multi-mode fiber doped with rare earth ion. A multi-mode fiber () that includes a rare-earth-ion-doped core and that has a normalized frequency of not less than 2.40 includes a filter portion () that is formed by bending a partial section of or entirety of the multi-mode fiber (), the filter portion () having a smallest diameter (diameter R) that is set so that (1) only LP, LP, LP, and LPmodes propagate or only LPand LPmodes propagate and (2) a loss of a highest-order one of the modes that propagate is not more than 0.1 dB/m.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile