公开(公告)号：US09541707B2

公开(公告)日：2017-01-10

申请号：US14474177

申请日：2014-08-31

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Tsunetoshi Saito ,  Katsunori Imamura ,  Kengo Watanabe

IPC: G02B6/26 ,  G02B6/255 ,  C03B37/012 ,  G02B6/02

CPC classification number: G02B6/2555 ,  C03B37/01222 ,  C03B2203/14 ,  C03B2203/34 ,  G02B6/02042 ,  G02B6/02338 ,  G02B6/2551

Abstract: A multicore fiber 1 includes a plurality of cores 3 disposed at predetermined intervals and surrounded by a cladding 5. The multicore fiber 1 also includes a marker 7 formed apart from the cores 3. The refractive index of the marker 7 is different from those of the cores 3 and the cladding 5. For example, the marker 7 may be made of a material having lower refractive index than that of the cladding 5. In this case, for example, the cores 3 may be made of germanium-doped quartz. The cladding 5 may be made of pure quartz. The marker 7 may be made of fluorine-doped quartz. Further, the marker 7 may be an empty hole.

Abstract translation: 多芯纤维1包括以预定间隔设置并被包层5包围的多个芯3.多芯纤维1还包括与芯3分开形成的标记7.标记7的折射率与 芯3和包层5.例如，标记7可以由折射率低于包层5的材料制成。在这种情况下，例如，芯3可以由锗掺杂的石英制成。 包层5可以由纯石英制成。 标记7可以由掺氟石英制成。 此外，标记物7可以是空洞。

公开(公告)号：US20190219766A1

公开(公告)日：2019-07-18

申请号：US16361629

申请日：2019-03-22

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Kengo Watanabe ,  Kazunori Mukasa ,  Tsunetoshi Saito ,  Yoshiki Nomura

IPC: G02B6/26

CPC classification number: G02B6/262 ,  G02B6/02 ,  G02B6/032 ,  G02B6/26

Abstract: A tapered waveguide is optically connected to an end surface of an optical fiber bundle part, and has a tapered part that changes in outside diameter in a tapered shape. The fiber bundle part is optically connected to the end surface of the large-diameter side of the waveguide. The entire waveguide has a substantially uniform index of refraction. A delivery fiber is optically connected to the end surface on the small-diameter side of the waveguide. As with the fiber bundle part the delivery fiber passes through a hole in a capillary and is affixed. The capillaries are each affixed to a retaining member such that the fiber bundle part, the waveguide, and the delivery fiber are disposed on the same axis and optically connected. The waveguide is retained in a state floating from the retaining member, and the outside surface of the waveguide is not in contact with the retaining member.

公开(公告)号：US10139574B2

公开(公告)日：2018-11-27

申请号：US15443987

申请日：2017-02-27

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Kengo Watanabe ,  Tsunetoshi Saito ,  Katsuki Suematsu ,  Mitsuhiro Iwaya ,  Kohei Kawasaki ,  Masahito Morimoto

IPC: G02B6/38 ,  G02B6/40

Abstract: A plurality of holes are formed in a ferrule. The holes are at sites penetrated by the tips of optical fibers. An opening is formed in the upper surface of the ferrule and an internal housing section is exposed from the opening. The housing section is at a site at which an optical fiber holding member is housed. The optical fibers are held by the optical fiber holding member. The optical fibers are multi-core fibers. In other words, the optical fibers have a specified axis of symmetry in a cross-section vertical to the longitudinal direction of the optical fibers and have orientation relative to a rotation direction having the longitudinal direction as the axis thereof.

公开(公告)号：US09829652B2

公开(公告)日：2017-11-28

申请号：US15134343

申请日：2016-04-20

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Kengo Watanabe ,  Tsunetoshi Saito

IPC: G02B6/38 ,  G02B6/04 ,  G02B6/40 ,  G02B6/02

CPC classification number: G02B6/3885 ,  G02B6/02042 ,  G02B6/04 ,  G02B6/3863 ,  G02B6/3882 ,  G02B6/403

Abstract: In the present invention, a connector structure comprises a multi-core fiber and a ferrule. The multi-core fiber comprises a plurality of cores and a cladding that surrounds the cores. The ferrule holds the multi-core fiber. A tip of the multi-core fiber protrudes from an end face of the ferrule. A relation Δ≦14.8/a is satisfied. In the formula, Δ (μm) is a difference between a maximum protrusion height and a minimum protrusion height from an end face of the ferrule in a reference circle at the tip of the multi-core fiber. The reference circle is a minimum circle that includes all mode field diameters of the plurality of the cores having a center of cross section of the multi-core fiber as its center. And a (μm) is a radius of the reference circle.

公开(公告)号：US09658410B2

公开(公告)日：2017-05-23

申请号：US14021600

申请日：2013-09-09

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Tsunetoshi Saito ,  Kengo Watanabe

IPC: G02B6/40 ,  G02B6/38 ,  G01B11/27

CPC classification number: G02B6/40 ,  G01B11/272 ,  G02B6/3885 ,  G02B6/403

Abstract: An optical connector is structured so as to include a fiber connection structure therein. A multi-core fiber is included inside a ferrule, and affixed to the ferrule substrate. One end surface of the multi-core fiber is exposed to an end surface of the ferrule. The other end of the multi-core fiber passes through and is affixed to a capillary. A plurality of optical fiber pass through a capillary that faces the capillary, and are affixed thereto the capillary in the same manner. Seven optical fiber cores of the same diameter are joined in a close-packed arrangement in the fiber connection structure.

公开(公告)号：US20140240819A1

公开(公告)日：2014-08-28

申请号：US14245672

申请日：2014-04-04

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Yukihiro TSUCHIDA ,  Koichi Maeda ,  Yu Mimura ,  Hiroshi Matsuura ,  Kengo Watanabe ,  Tsunetoshi Saito ,  Ryo Miyabe ,  Shigeto Matsumoto ,  Keiichi Aiso ,  Ryuichi Sugizaki

IPC: H01S3/067 ,  G02B6/02

CPC classification number: H01S3/06708 ,  G02B6/02042 ,  H01S3/0064 ,  H01S3/06737 ,  H01S3/06754 ,  H01S3/094061 ,  H01S3/09415 ,  H01S3/1608 ,  H01S3/2383 ,  H01S2301/02 ,  H01S2301/04 ,  H04J14/02 ,  H04J14/04

Abstract: A multi-core amplification optical fiber includes a plurality of rare-earth-doped core portions and a cladding portion positioned at an outer periphery of the core portions and having refractive index lower than those of the core portions. When a doping concentration of the rare-earth of each of the core portions is 250 ppm to 2000 ppm, a relative refractive index difference of each of the core portions relative to the cladding portion is 0.5% to 2% at a wavelength of 1550 nm, and a core diameter of each of the core portions is 1 μm to 5 μm, a separation distance between each of the core portions and adjacent one of the core portions is set at equal to or larger than 30 μm and at equal to or smaller than 60 μm so that a light-crosstalk between the adjacent core portions is equal to or lower than −30 dB.

Abstract translation: 多芯放大光纤包括多个稀土掺杂芯部和位于芯部的外周的折射率低于芯部的折射率的包层部。 每个芯部的稀土的掺杂浓度为250ppm〜2000ppm时，芯部相对于包层部的相对折射率差在1550nm的波长为0.5〜2％ ，芯部的芯部直径为1μm〜5μm，芯部与相邻的一个芯部之间的间隔距离设定为30μm以上，等于或小于 使得相邻芯部之间的光串扰等于或低于-30dB。

公开(公告)号：US11936156B2

公开(公告)日：2024-03-19

申请号：US17148645

申请日：2021-01-14

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Noriyuki Yokouchi ,  Kengo Watanabe

IPC: H01S3/067 ,  H01S3/081 ,  H01S5/14

CPC classification number: H01S3/06754 ,  H01S3/06704 ,  H01S3/0812 ,  H01S5/146 ,  H01S3/0675

Abstract: An optical power transmission apparatus includes: a light emitting unit including a first optical gain generating means and a first light reflecting means; an optical fiber; a second light reflecting means; and a light receiving means. Further, the second light reflecting means is arranged nearer to the light receiving means than the optical fiber is, a first laser resonator is formed, between the first light reflecting means and the second light reflecting means, by optical connection between the first optical gain generating means and the optical fiber, and first laser light generated by the first laser resonator is configured to be incident on the light receiving means.

公开(公告)号：US11125950B2

公开(公告)日：2021-09-21

申请号：US16700847

申请日：2019-12-02

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Kengo Watanabe ,  Katsuki Suematsu ,  Masato Shiino

IPC: G02B6/26 ,  G02B6/38 ,  G02B3/00 ,  G02B6/12 ,  G02B6/293

Abstract: A return loss in an optical connector connection structure according to a lens scheme is reduced. An optical connector (10) according to this disclosure, includes: a plurality of optical fibers (18) arranged in an array; and a lens array plate (14) that includes a first principal surface (40) with a plurality of lenses (44) corresponding to the respective optical fibers being formed on this surface, and a second principal surface (41) joined to end faces (180) of the optical fibers so as to be opposed to the first principal surface and optically coupled to the optical fibers to which the respective lenses correspond, wherein at least one of the end faces of the optical fibers and the second principal surface is inclined from a plane (182) perpendicular to optical axes (181) of the optical fibers.

公开(公告)号：US10012803B2

公开(公告)日：2018-07-03

申请号：US15501395

申请日：2015-08-04

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Kengo Watanabe ,  Tsunetoshi Saito

IPC: G02B6/38 ,  G02B6/02 ,  G02B6/04 ,  G02B6/42

CPC classification number: G02B6/3885 ,  G02B6/02042 ,  G02B6/04 ,  G02B6/3672 ,  G02B6/40 ,  G02B6/4202

Abstract: This optical fiber connection structure connects a multicore fiber and a bundle structure bundling a plurality of optical fibers. The multicore fiber has a plurality of cores arranged in a lattice. The bundle structure includes closely packed optical fibers of the same diameter. The bundle structure is configured such that signal light optical fiber groups including signal light optical fibers and a dummy fiber group including dummy optical fibers are stacked in multiple layers. The signal light optical fiber groups are configured with the signal light optical fibers aligned in the mutually contacting direction. The signal light optical fiber groups and the dummy fiber group are stacked orthogonal to the alignment direction of the optical fibers constituting the respective fiber groups.

公开(公告)号：US09158064B2

公开(公告)日：2015-10-13

申请号：US14021680

申请日：2013-09-09

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Tsunetoshi Saito ,  Kengo Watanabe

IPC: G02B6/38 ,  G02B6/02 ,  G02B6/40 ,  G02B6/255

CPC classification number: G02B6/02042 ,  G02B6/2551 ,  G02B6/3885 ,  G02B6/403

Abstract: A multicore fiber has a plurality of cores formed at predetermined distances and surrounded by a cladding. A bundle structure includes optical fibers joined in a close-packed arrangement. Specifically, one optical fiber is arranged at a center, and six optical fibers are arranged around the optical fiber arranged at the center. Accordingly, cores of the optical fibers are arranged at equal distances. The optical fibers are bonded together with an adhesive. Accordingly, claddings of adjacent optical fibers are in contact with each other either directly or via the adhesive. The adhesive also fills spaces between the optical fibers.

Abstract translation: 多芯光纤具有以预定距离形成并被包层围绕的多个芯。 束结构包括以紧密堆积布置连接的光纤。 具体地说，一个光纤布置在中心，并且在布置在中心的光纤周围布置了六根光纤。 因此，光纤的芯部以相等的距离排列。 光纤用粘合剂粘合在一起。 因此，相邻光纤的包层直接或经由粘合剂彼此接触。 粘合剂还填充光纤之间的空间。