公开(公告)号：US20210041622A1

公开(公告)日：2021-02-11

申请号：US16963455

申请日：2019-02-08

申请人： Nippon Telegraph and Telephone Corporation

发明人： Hirotaka Ono ,  Shinichi Aozasa

IPC分类号： G02B6/02 ,  C03C25/12 ,  C03C25/1065

摘要： Provided are a multi-core fiber that enables complete automation of alignment in fusion splicing of multi-core fibers and an apparatus for manufacturing the multi-core fiber. A glass cladding of the multi-core fiber has a coating. A coating marker is drawn on the coating at a position that is determined by a predetermined rule that prescribes a positional relation with the core, for example, the coating marker is drawn on the coating near a specific core number. During fusion splicing of the multi-core fibers, two multi-core fibers are installed such that positions of the coating markers are substantially aligned. After the installation of the multi-core fibers, the coating markers of the two multi-core fibers are subjected to automatic rotational alignment by a fusion splicer to achieve a predetermined positional relation, and thus rotational positions between the two multi-core fibers are aligned.

公开(公告)号：US10782478B2

公开(公告)日：2020-09-22

申请号：US16322432

申请日：2017-08-01

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Masaki Wada ,  Taiji Sakamoto ,  Takayoshi Mori ,  Shinichi Aozasa ,  Takashi Yamamoto ,  Kazuhide Nakajima

IPC分类号： G02B6/26 ,  H01S3/10 ,  H01S3/067 ,  G02B6/02 ,  G02B6/036

摘要： A differential mode attenuation compensator includes a first multi-mode optical fiber and a third multi-mode optical fiber in which a plurality of propagation modes propagate in a wavelength of a propagating optical signal; and a second multi-mode optical fiber including a core and a clad and arranged with a central axis aligned between the first multi-mode optical fiber and the third multi-mode optical fiber, in which each loss in the plurality of propagation modes is different in the first multi-mode optical fiber and the third multi-mode optical fiber.

公开(公告)号：US11196227B2

公开(公告)日：2021-12-07

申请号：US16343357

申请日：2017-10-25

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Masaki Wada ,  Shinichi Aozasa ,  Taiji Sakamoto ,  Takashi Yamamoto ,  Kazuhide Nakajima ,  Takayoshi Mori

IPC分类号： H01S3/00 ,  H01S3/067 ,  H04B10/2581 ,  H01S3/106 ,  H01S3/10

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：US11237322B2

公开(公告)日：2022-02-01

申请号：US16571974

申请日：2019-09-16

申请人： FURUKAWA ELECTRIC CO., LTD. ,  NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Shinichi Arai ,  Harumi Inaba ,  Shigeto Matsumoto ,  Takeshi Yagi ,  Shinichi Aozasa ,  Kyozo Tsujikawa ,  Kazuhide Nakajima

IPC分类号： G02B6/02 ,  G02B6/036

摘要： An optical fiber manufacturing method includes setting a first holding member and a rod inside a glass pipe, the first holding member made of glass and having plural holes formed, so that the rod is supported by the first holding member; filling glass particles between the rod and a glass pipe inner wall; holding the rod such that the rod and the filled glass particles are enclosed by the glass pipe inner wall and the first and second holding members, and sealing one end of the glass pipe and manufacturing an intermediate; and manufacturing an optical fiber from the intermediate, wherein a bulk density of the first and second holding members is set with reference to a bulk density of a filling portion made from the glass particles, and the predetermined range is determined according to a core diameter permissible variation range in its longitudinal direction.

公开(公告)号：US20200012042A1

公开(公告)日：2020-01-09

申请号：US16571974

申请日：2019-09-16

申请人： FURUKAWA ELECTRIC CO., LTD. ,  NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Shinichi ARAI ,  Harumi Inaba ,  Shigeto Matsumoto ,  Takeshi Yagi ,  Shinichi Aozasa ,  Kyozo Tsujikawa ,  Kazuhide Nakajima

IPC分类号： G02B6/02 ,  G02B6/036

摘要： An optical fiber manufacturing method includes setting a first holding member and a rod inside a glass pipe, the first holding member made of glass and having plural holes formed, so that the rod is supported by the first holding member; filling glass particles between the rod and a glass pipe inner wall; holding the rod such that the rod and the filled glass particles are enclosed by the glass pipe inner wall and the first and second holding members, and sealing one end of the glass pipe and manufacturing an intermediate; and manufacturing an optical fiber from the intermediate, wherein a bulk density of the first and second holding members is set with reference to a bulk density of a filling portion made from the glass particles, and the predetermined range is determined according to a core diameter permissible variation range in its longitudinal direction.