公开(公告)号：US10310177B2

公开(公告)日：2019-06-04

申请号：US15563988

申请日：2016-03-22

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takashi Matsui ,  Kyozo Tsujikawa ,  Fumihiko Yamamoto ,  Nobutomo Hanzawa

IPC: G02B6/02

Abstract: An object of the present invention is to provide a structure of an optical fiber capable of satisfying desired requirements of an output power, a propagation distance, and a beam quality. In the design of the PCF of the present invention, the PCF has air holes having diameters d and intervals Λ in an overlapping region where a region of Aeff of a desired value or more and a cutoff region in a desired higher-order mode overlap each other on a graph where the horizontal axis represents d/Λ and the vertical axis represents Λ, so that it is possible to sufficiently cut off the mode which is the desired higher-order mode or more, and thus, it is possible to select a region where the Aeff is large.