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:
Feb. 13, 2018
Filed:
Feb. 23, 2017
Furukawa Electric Co., Ltd., Tokyo, JP;
Nippon Telegraph and Telephone Corporation, Chiyoda-ku, JP;
Katsunori Imamura, Tokyo, JP;
Tomohiro Gonda, Tokyo, JP;
Ryuichi Sugizaki, Tokyo, JP;
Taiji Sakamoto, Tokyo, JP;
Takayoshi Mori, Tokyo, JP;
Masaki Wada, Tokyo, JP;
Takashi Yamamoto, Tokyo, JP;
Fumihiko Yamamoto, Tokyo, JP;
FURUKAWA ELECTRIC CO., LTD., Tokyo, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Chiyoda-ku, JP;
Abstract
A multicore fiber includes a plurality of unit multicore fibers each including: a plurality of core portions; and a clad portion which is formed in an outer circumference of the core portions and has a refractive index lower than a maximum refractive index of the core portions. The plurality of the core portions have substantially same refractive index profile and different group delays at same wavelength in same propagation mode. The core portions of the multicore fiber are configured so that the core portions of the plurality of the unit multicore fibers are connected in cascade, a maximum value of differential group delays between the core portions of the multicore fiber is smaller than a reduced value of a maximum value of differential group delays between the core portions of each unit multicore fiber as a value in terms of a length of the multicore fiber.