公开(公告)号：US20200225432A1

公开(公告)日：2020-07-16

申请号：US16648458

申请日：2018-09-20

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Hiroki ISHIKAWA ,  Fumiaki SATO ,  Ryoei OKA ,  Yuki KAWAGUCHI ,  Sotaro IDA

IPC: G02B6/44

Abstract: An optical fiber cable includes: optical fiber units obtained by collecting a plurality of optical fiber ribbons in which a plurality of optical fibers are arranged in parallel; and a slot rod including a plurality of slot grooves formed in a spiral shape in order to store the optical fiber units. The optical fiber units are stranded in a longitudinal direction of the optical fiber cable in a state in which the optical fiber ribbons are not twisted, and the optical fiber units are stored in the longitudinal direction of the optical fiber cable in a state of being untwisted stranding in the slot grooves.

公开(公告)号：US20160216439A1

公开(公告)日：2016-07-28

申请号：US14306604

申请日：2014-06-17

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Kazuhiro YONEZAWA ,  Sotaro IDA ,  Tadashi ENOMOTO

IPC: G02B6/028 ,  G02B6/036

CPC classification number: G02B6/0288 ,  G02B6/0281 ,  G02B6/03627 ,  G02B6/0365

Abstract: An embodiment of the present invention relates to an MMF with a structure for reducing length dependence of optical characteristics while maintaining bend-insensitivity. The MMF has a trench portion provided between a core portion and a cladding portion and having a refractive index lower than that of the cladding portion. In a cross section of the MMF, the trench portion in at least a partial section of the MMF has a non-circularly symmetric shape with respect to an intersection between the optical axis and the cross section.

Abstract translation: 本发明的实施例涉及一种具有减少光学特性的长度依赖性同时保持弯曲不敏感性的结构的MMF。 MMF具有设置在芯部和包层部之间的折射率低于包层部的折射率的沟槽部。 在MMF的横截面中，MMF的至少部分部分中的沟槽部分相对于光轴和横截面之间的交点具有非圆形对称的形状。

公开(公告)号：US20220306515A1

公开(公告)日：2022-09-29

申请号：US17697124

申请日：2022-03-17

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Takahiro SAITO ,  Sotaro IDA ,  Hiroki INOUE

IPC: C03B37/014

Abstract: A method for manufacturing an optical fiber preform includes a deposition step and an introduction step. In the deposition step, glass fine particles are generated from a glass raw material gas in a flame obtained by burning a flammable gas supplied to a burner, and the glass fine particles are deposited to produce a hollow porous glass preform. In the introduction step, a first gas is introduced into an inside of a hollow of the porous glass preform, and a second gas is introduced to an outside of the porous glass preform. In the method, at least one of the first gas and the second gas is a gas containing halogen. In the gas introduction step, the gas containing halogen is introduced so that a first partial pressure of the first gas and a second partial pressure of the second gas are different from each other.

公开(公告)号：US20200278493A1

公开(公告)日：2020-09-03

申请号：US16801486

申请日：2020-02-26

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Hiroki ISHIKAWA ,  Keisei MORITA ,  Sotaro IDA

IPC: G02B6/02 ,  G02B6/028

Abstract: An optical fiber includes a glass fiber and a coating resin covering an outer periphery of the glass fiber. The glass fiber includes a core and a cladding. An outer diameter of the glass fiber is 99 μm or larger and 101 μm or smaller. The coating resin includes a cured material of an ultraviolet curing resin composition. An outer diameter of the coating resin is 160 μm or larger and 170 μm or smaller. A mode field diameter for light having a wavelength of 1310 nm is 7.2 μm or larger and 8.2 μm or smaller. Bending loss at a wavelength of 1550 nm when wound in a ring shape having a radius of 10 mm is 0.1 dB/turn or less. Bending loss at the wavelength of 1550 nm when wound in the ring shape having the radius of 7.5 mm is 0.5 dB/turn or less.

公开(公告)号：US20200278492A1

公开(公告)日：2020-09-03

申请号：US16795964

申请日：2020-02-20

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Keisei MORITA ,  Hiroki ISHIKAWA ,  Sotaro IDA

IPC: G02B6/02 ,  G02B6/028 ,  G02B6/036

Abstract: An optical fiber includes a glass fiber and a coating resin covering an outer periphery of the glass fiber. The glass fiber includes a core, an inner cladding, a trench, and an outer cladding. An outer diameter of the glass fiber is 99 μm or larger and 101 μm or smaller. An outer diameter of the coating resin is 160 μm or larger and 170 μm or smaller. A mode field diameter for light having a wavelength of 1310 nm is 7.2 μm or larger and 8.2 μM or smaller. Bending loss at a wavelength of 1550 nm when wound in a ring shape having a radius of 10 mm is 0.1 dB/turn or less. Bending loss at the wavelength of 1550 nm when wound in the ring shape having the radius of 7.5 mm is 0.5 dB/turn or less.

公开(公告)号：US20150226916A1

公开(公告)日：2015-08-13

申请号：US14175252

申请日：2014-02-07

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Itaru SAKABE ,  Sotaro IDA ,  Tomoyuki HATTORI

IPC: G02B6/028

CPC classification number: G02B6/0288

Abstract: A multi mode optical fiber includes a core having a refractive index distribution of a curved form, a central part in a radial direction of which protrudes, a cladding provided in the periphery of the core and having a constant refractive index lower than a refractive index of the core and a trench layer provided between the core and the cladding and having a constant refractive index lower than that of the cladding. A width dimension of the trench layer in the radial direction is set to 2 μm or smaller and a ratio of an absolute value of Δ trench that is a refractive index difference between the cladding and the trench layer to an absolute value of Δ core that is a maximum refractive index difference between the cladding and the core is set to 0.5 or larger.

Abstract translation: 多模光纤包括具有弯曲形状的折射率分布的芯，其径向的中心部分突出，设置在芯的周围的包层，并且具有比折射率低的折射率的折射率 芯和沟槽层设置在芯和包层之间并且具有比包层的折射率低的恒定的折射率。 沟槽层的径向宽度尺寸设定为2μm以下，绝对值＆Dgr; 沟槽，其是包层和沟槽层之间的折射率差，绝对值为＆Dgr; 作为包层和芯之间的最大折射率差的芯设定为0.5以上。