公开(公告)号：EP3514895A1

公开(公告)日：2019-07-24

申请号：EP17868467.6

申请日：2017-10-25

申请人： Nippon Telegraph and Telephone Corporation

发明人： WADA, Masaki ,  AOZASA, Shinichi ,  SAKAMOTO, Taiji ,  YAMAMOTO, Takashi ,  NAKAJIMA, Kazuhide ,  MORI, Takayoshi

IPC分类号： H01S3/10 ,  H01S3/067

摘要： An optical amplifier of the present disclosure includes an optical resonator that includes an amplification fiber capable of amplifying signal light having one or more propagation modes and resonates at least one propagation mode of the signal light amplified by the amplification fiber; an excitation light source that outputs excitation light for exciting the amplification fiber; and a multiplexer that multiplexes the signal light and the excitation light, in which the optical resonator includes a gain clamp setting unit which sets gain clamp for at least one propagation mode out of a plurality of propagation modes resonating in the optical resonator.

公开(公告)号：EP1655625B1

公开(公告)日：2019-12-18

申请号：EP04771600.6

申请日：2004-08-12

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： MORI, Atsushi ,  KATO, Masao ,  ENBUTSU, Kouji ,  AOZASA, Shinichi ,  OIKAWA, Kiyoshi ,  KURIHARA, Takashi ,  FUJIURA, Kazuo ,  SHIMIZU, Makoto ,  SHIKANO, Kouji

IPC分类号： G02B6/02 ,  G02B6/036 ,  G02F1/365 ,  C03C13/04 ,  C03B37/012 ,  C03B37/027

公开(公告)号：EP3604243A1

公开(公告)日：2020-02-05

申请号：EP18771583.4

申请日：2018-03-08

申请人： Furukawa Electric Co., Ltd. ,  Nippon Telegraph and Telephone Corporation

发明人： ARAI, Shinichi ,  INABA, Harumi ,  MATSUMOTO, Shigeto ,  YAGI, Takeshi ,  AOZASA, Shinichi ,  TSUJIKAWA, Kyozo ,  NAKAJIMA, Kazuhide

IPC分类号： C03B37/012 ,  C03B37/014 ,  C03B37/027 ,  G02B6/02

摘要： An optical fiber manufacturing method includes placing, inside a glass pipe constituting a cladding portion, a first holding member, which is one of a pair of holding members made of glass and having a plurality of holes formed thereon, and a core rod, which includes a core forming portion serving as the core portion and includes a cladding forming portion constituting the cladding portion, in such a way that the core rod is supported by the first holding member; includes filling glass particles in the gap between the inner wall face of the glass pipe and the core rod; includes placing a second holding member of the pair of holding members inside the glass pipe and holding the core rod in a sandwiched manner in between the first holding member and the second holding member; includes sealing one end portion of the glass pipe and manufacturing an intermediate object; and includes manufacturing an optical fiber using the intermediate object. The bulk density of the first holding member and the second holding member is set to be within a predetermined range with reference to the bulk density of the filling portion filled with the glass particles, and the predetermined range is determined according to the permissible variation range for the core diameter in the longitudinal direction of the optical fiber.

公开(公告)号：EP3961274A1

公开(公告)日：2022-03-02

申请号：EP20794731.8

申请日：2020-04-06

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： SAKAMOTO, Taiji ,  NAKAJIMA, Kazuhide ,  WADA, Masaki ,  AOZASA, Shinichi ,  YAMAMOTO, Takashi

IPC分类号： G02B6/02

摘要： An object is to provide a multi-core configuration for acquiring a random mode coupling in a case of an arbitrary core refractive index.
A multi-core optical fiber according to the present invention is an optical fiber in which two or more core regions are arranged in a clad region having a refractive index at a minimum core interval Λ smaller than a refractive index of the cores, a configuration of the cores is that including one propagation mode, and the core configuration and the core interval are adjusted so that an inter-mode coupling coefficient between adjacent cores is within a range from 0.73 to 120 m -1 .