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:
Dec. 24, 2024
Filed:
Sep. 09, 2020
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Ryota Imada, Musashino, JP;
Yoko Yamashita, Musashino, JP;
Takashi Matsui, Musashino, JP;
Taiji Sakamoto, Musashino, JP;
Nobutomo Hanzawa, Musashino, JP;
Noriyuki Araki, Musashino, JP;
Shinichi Aozasa, Musashino, JP;
Yuto Sagae, Musashino, JP;
Kazuhide Nakajima, Musashino, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Abstract
Provided are an LPFG and an optical transmission system in which a mode conversion amount does not depend on a polarization state and an electric field distribution. The LPFG according to the present invention includes cavity rows (-and-) of cavitiesperiodically arranged in a core regionof the few-mode fiberat a position away from a central axis z of the core regionin parallel with the central axis z. Each of the cavity rows (-and-) is located at a different position in a longitudinal direction of the few-mode fiber(where the position in a z direction is different), and the cavity rows (-and-) are located at positions shifted by 90° on a cross section of the core regionwith the center of the cross section of the core region(the intersection of an x-axis and a y-axis) as an origin.