公开(公告)号：US20160075590A1

公开(公告)日：2016-03-17

申请号：US14920534

申请日：2015-10-22

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Tomohiro GONDA ,  Katsunori IMAMURA ,  Ryo MIYABE ,  Ryuichi SUGIZAKI

IPC: C03B37/012 ,  C03B37/027 ,  C03B37/018

CPC classification number: C03B37/01222 ,  C03B37/01205 ,  C03B37/01234 ,  C03B37/01486 ,  C03B37/01493 ,  C03B37/018 ,  C03B37/027 ,  C03B2203/23 ,  C03B2203/34 ,  C03B2207/50 ,  G02B6/02042

Abstract: A production method of an optical fiber preform includes first preparing a first preform having a plurality of glass preforms and a first cladding portion disposed between the plurality of glass preforms, and first arranging a second cladding portion to surround the first preform. At the first arranging, a material gas and a combustion gas are ejected from a burner to produce glass particles. The first preform and the burner are moved relative to each other in a longitudinal direction of the first preform. The glass particles are deposited on the first preform.

Abstract translation: 光纤预制棒的制造方法包括首先制备具有多个玻璃预制件的第一预制件和设置在多个玻璃预制件之间的第一包层部分，并且首先布置第二包层部分以围绕第一预制件。 在第一次排列时，将材料气体和燃烧气体从燃烧器喷出以产生玻璃颗粒。 第一预成型件和燃烧器在第一预制件的纵向上相对于彼此移动。 玻璃颗粒沉积在第一预型件上。

公开(公告)号：US20130183016A1

公开(公告)日：2013-07-18

申请号：US13786029

申请日：2013-03-05

Applicant: Furukawa Electric Co., Ltd.

Inventor： Katsunori IMAMURA

IPC: G02B6/02

CPC classification number: G02B6/02042 ,  C03B37/01222 ,  G02B6/0365

Abstract: A multi-core optical fiber includes: a plurality of core portions; and a cladding portion positioned so as to surround each of the core portions, wherein each core portion includes a center core portion that has a refractive index greater than that of the cladding portion, a second core portion that is formed so as to surround the center core portion and that has a refractive index less than that of the center core portion, and a depressed portion that is formed so as to surround the second core portion and that has a refractive index less than those of the second core portion and the cladding portion, and an interval distance between the adjacent core portions is set such that optical cross-talk between the core portions for a total length of the multi-core optical fiber is equal to or less than −30 dB at a wavelength of 1.55 μm.

Abstract translation: 多芯光纤包括：多个芯部; 以及包围部，其以每个芯部包围的方式设置，其特征在于，所述芯部具有折射率大于所述包层部的折射率的中心芯部，形成为围绕所述中心的中心部 芯部，折射率小于中心芯部的折射率;凹部，其形成为包围第二芯部，折射率小于第二芯部和包层部的折射率 并且相邻芯部之间的间隔距离被设定为使得在多纤芯光纤的总长度上的芯部之间的光纤串扰在1.55μm的波长下等于或小于-30dB。

公开(公告)号：US20160347645A1

公开(公告)日：2016-12-01

申请号：US15231896

申请日：2016-08-09

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Tomohiro GONDA ,  Ryo MIYABE ,  Katsunori IMAMURA ,  Tsunetoshi SAITO ,  Ryuichi SUGIZAKI

IPC: C03B37/012 ,  C03B37/025

CPC classification number: C03B37/01222 ,  C03B37/025 ,  C03B2203/23 ,  G02B6/02042

Abstract: A production method of an optical fiber preform includes: preparing a plurality of bar-shaped first preforms and a plurality of second preforms including through holes having substantially same shape with a shape of outer periphery of a cross section of the first preform, the cross section being orthogonal to a major axis of the first preform; and an assembly step of: matching the through holes of the second preforms to make communication holes; and inserting, through each of the communication holes, at least two of the first preforms arranged side by side in a direction of the major axis such that the second preforms and the first preforms are fitting each other. In at least one position in the direction of the major axis of the communication holes, a position where the second preforms contact with each other differs from a position where the first preforms contact with each other.

Abstract translation: 光纤预制棒的制造方法包括：准备多个棒状的第一预成型体和多个第二预成型体，所述多个第二预成型体包括具有与第一预成型体的截面形状相同形状的通孔，截面积 正交于第一预型件的长轴; 以及组装步骤：使所述第二预成型体的通孔匹配以形成连通孔; 以及通过每个所述连通孔插入沿所述长轴方向并排布置的至少两个所述第一预制件，使得所述第二预制件和所述第一预制件彼此配合。 在连通孔的长轴方向的至少一个位置上，第二预成型件彼此接触的位置与第一预成型件彼此接触的位置不同。

公开(公告)号：US20160216440A1

公开(公告)日：2016-07-28

申请号：US15088405

申请日：2016-04-01

Applicant: Furukawa Electric Co., Ltd.

Inventor： Katsunori IMAMURA ,  Ryuichi SUGIZAKI ,  Takehiro TSURITANI ,  Koji IGARASHI

IPC: G02B6/028

CPC classification number: G02B6/0288 ,  G02B6/0281

Abstract: An optical fiber includes a core portion, and a cladding portion being formed at an outer periphery of the core portion and having a refractive index lower than a maximum refractive index of the core portion. The core portion has α-shaped refractive index profile in which a value of α is equal to or greater than 3 and equal to or smaller than 10, and at least a diameter of the core portion and a relative refractive-index difference of the core portion relative to the cladding portion are set so that light can be propagated with equal to or greater than 6 propagation modes at a wavelength of light inputted.

Abstract translation: 光纤包括芯部，以及在芯部的外周形成折射率低于芯部的最大折射率的包层部。 芯部具有α值折射率分布，其中α值等于或大于3且等于或小于10，并且芯部的至少直径和芯的相对折射率差异 设置相对于包层部分的部分，使得光可以在输入的光的波长下以等于或大于6种传播模式传播。

公开(公告)号：US20160028206A1

公开(公告)日：2016-01-28

申请号：US14835641

申请日：2015-08-25

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Kengo WATANABE ,  Tsunetoshi SAITO ,  Yukihiro TSUCHIDA ,  Koichi MAEDA ,  Katsunori IMAMURA

IPC: H01S3/094 ,  G02B6/02 ,  H01S3/067 ,  G02B6/40

CPC classification number: H01S3/094042 ,  G02B6/02042 ,  G02B6/2552 ,  G02B6/2856 ,  G02B6/40 ,  H01S3/06737 ,  H01S3/06745 ,  H01S3/06783 ,  H01S3/094003 ,  H01S3/1608

Abstract: A bundle structure is obtained by arranging optical fibers having equal diameters in a close-packed arrangement around the outer circumference of a center optical fiber. The optical fibers are signal light optical fibers that transmit signal lights. The optical fiber is a pump light optical fiber that transmits pump light. The number of optical fibers is equal to the number of cores in the multi-core fiber. The bundle structure and the multi-core fiber are connected to one another by adhering or fusing. The cores and the cores are optically connected, and the core and the cladding are optically connected. When connecting, the mode field diameter of the cores and the cores are substantially equivalent. In addition, the outer diameter (diameter of circumscribed circle including optical fibers) of the bundle structure is set so as not to be greater than the outer diameter of the multi-core fiber.

Abstract translation: 通过以紧密堆积的方式布置具有相等直径的光纤围绕中心光纤的外圆周来获得束结构。 光纤是传输信号灯的信号光纤。 光纤是透射泵浦光的泵浦光纤。 光纤的数量等于多芯光纤中的芯数。 束结构和多芯光纤通过粘接或熔合而相互连接。 芯和芯被光学连接，并且芯和包层被光学连接。 当连接时，芯和芯的模场直径基本相等。 此外，束结构的外径（包括光纤的外接圆的直径）设定为不大于多芯纤维的外径。

公开(公告)号：US20170160466A1

公开(公告)日：2017-06-08

申请号：US15440228

申请日：2017-02-23

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

Inventor： Katsunori IMAMURA ,  Tomohiro GONDA ,  Ryuichi SUGIZAKI ,  Taiji SAKAMOTO ,  Takayoshi MORI ,  Masaki WADA ,  Takashi YAMAMOTO ,  Fumihiko YAMAMOTO

IPC: G02B6/02 ,  C03B37/16 ,  C03B37/012 ,  G02B6/028

CPC classification number: G02B6/02042 ,  C03B37/01205 ,  C03B37/01222 ,  C03B37/027 ,  C03B37/16 ,  C03B2203/10 ,  C03B2203/18 ,  C03B2203/22 ,  C03B2203/23 ,  C03B2203/26 ,  C03B2203/34 ,  C03B2205/30 ,  G02B6/0288 ,  G02B6/0365

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.

公开(公告)号：US20160020573A1

公开(公告)日：2016-01-21

申请号：US14834448

申请日：2015-08-25

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Kengo WATANABE ,  Tsunetoshi SAITO ,  Yukihiro TSUCHIDA ,  Koichi MAEDA ,  Katsunori IMAMURA

IPC: H01S3/067 ,  H01S3/094 ,  G02B6/40 ,  G02B6/255

CPC classification number: H01S3/094042 ,  G02B6/02042 ,  G02B6/2552 ,  G02B6/2856 ,  G02B6/40 ,  H01S3/06737 ,  H01S3/06745 ,  H01S3/06783 ,  H01S3/094003 ,  H01S3/1608

Abstract: An optical-fiber-bundle structure is connected to one end of a multi-core fiber. The multi-core fiber has a tapered section formed therein. The outside diameter of the multi-core fiber and the core pitch thereof decrease in the tapered section. It is possible for the multi-core fiber to have an increasing core pitch on the connection-side thereof which connects to the optical-fiber-bundle structure; hence, it is possible to use an easy-to-use large-diameter optical fiber as the optical fiber to be provided in the optical-fiber-bundle structure. When connecting another multi-core fiber to the other end of the multi-core fiber, it is possible to match the outer diameters thereof; hence, when fusion splicing to one another, it is unlikely for a positional shift of the cores to occur.

Abstract translation: 光纤束结构连接到多芯光纤的一端。 多芯纤维在其中形成有锥形部。 多芯纤维的外径和芯间距在锥形部分中减小。 多芯光纤在与光纤束结构连接的连接侧上具有增加的芯间距， 因此，可以使用易于使用的大直径光纤作为光纤束结构中设置的光纤。 当将多芯纤维连接到多芯光纤的另一端时，可以匹配其多芯纤维的外径; 因此，当熔接彼此时，不可能使芯发生位置偏移。

公开(公告)号：US20150188634A1

公开(公告)日：2015-07-02

申请号：US14218047

申请日：2014-03-18

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Katsunori IMAMURA

IPC: H04B10/25 ,  G02B6/02

CPC classification number: H04B10/25 ,  G02B6/02042 ,  G02B6/02333 ,  G02B6/02347

Abstract: An optical transmission system includes an optical transmitting unit, a multi-core optical fiber, an optical multiplexing unit, an optical demultiplexing unit, and an optical receiving unit. The optical transmitting unit outputs optical signals having a plurality of wavelengths included in an operation wavelength band. The multi-core optical fiber is connected to the optical transmitting unit and has a plurality of core portions. The optical multiplexing unit multiplexes the optical signals to the core portions. The optical demultiplexing unit demultiplexes the optical signals transmitted through the multi-core optical fiber. The optical receiving unit receives the optical signals demultiplexed by the optical demultiplexing unit, and the optical signals having different wavelengths from each other are input to different core portions from each other.

Abstract translation: 光传输系统包括光发射单元，多核光纤，光复用单元，光解复用单元和光接收单元。 光发送单元输出具有包括在操作波长带中的多个波长的光信号。 多芯光纤连接到光发射单元，并且具有多个芯部。 光复用单元将光信号复用到核心部分。 光解复用单元对通过多芯光纤传输的光信号进行解复用。 光接收单元接收由光解复用单元解复用的光信号，并且具有彼此不同波长的光信号彼此输入到不同的核心部分。

公开(公告)号：US20150055923A1

公开(公告)日：2015-02-26

申请号：US14474177

申请日：2014-08-31

Applicant: FURUKAWA ELECTRIC CO.,LTD.

Inventor： Tsunetoshi SAITO ,  Katsunori IMAMURA ,  Kengo WATANABE

IPC: 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的折射率不同于 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：US20130064543A1

公开(公告)日：2013-03-14

申请号：US13669882

申请日：2012-11-06

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Katsunori IMAMURA

IPC: H04J14/00 ,  G02B6/036

CPC classification number: H04B10/25 ,  G02B6/02042 ,  G02B6/02333 ,  G02B6/02347

Abstract: An optical transmission system includes an optical transmitting unit that outputs at least one optical signal having a wavelength included in an operation wavelength band and a holey fiber that is connected to the optical transmitting unit. The holey fiber includes a core and a cladding formed around the core. The cladding includes a plurality of holes formed around the core in a triangular lattice shape. The holey fiber transmits the optical signal in a single mode. A bending loss of the holey fiber is equal to or less than 5 dB/m at a wavelength within the operation wavelength band when the holey fiber is wound at a diameter of 20 millimeters.