公开(公告)号：US20240094477A1

公开(公告)日：2024-03-21

申请号：US18271899

申请日：2021-01-27

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Chisato FUKAI ,  Yoshiteru ABE ,  Kunihiro TOGE ,  Kazunori KATAYAMA

IPC: G02B6/38 ,  G02B6/40

CPC classification number: G02B6/3874 ,  G02B6/3871 ,  G02B6/403

Abstract: An objective of the present disclosure is to provide an optical coupler and an optical switch capable of achieving stable optical characteristics with low power consumption and more economical efficiency with respect to external factors. To achieve the objective, an optical coupler according to the present disclosure includes: a first ferrule in which core centers of one or a plurality of single core fibers are arranged on the same circumference from the center on a fiber cross-section;



a second ferrule in which core centers of a plurality of single core fibers are arranged on a circumference of the same diameter as the circumference of the first ferrule in which the core centers of the single core fibers are arranged from the center on the fiber cross-section; and
a cylindrical sleeve which has a hollow portion into which the first and second ferrules are inserted so that central axes of the first and second ferrules are aligned with each other with a predetermined gap between each of outer diameters of the first and second ferrules and an inner diameter of the hollow portion so that the first and second ferrules can rotate.

公开(公告)号：US20240134127A1

公开(公告)日：2024-04-25

申请号：US18273177

申请日：2021-02-03

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Chisato FUKAI ,  Kunihiro TOGE ,  Yoshiteru ABE ,  Kazunori KATAYAMA

IPC: G02B6/35 ,  G02B6/02 ,  G02B6/38

CPC classification number: G02B6/354 ,  G02B6/02042 ,  G02B6/381

Abstract: An object of the present disclosure is to provide a simple, compact optical switch with low power consumption. The present disclosure is an optical switch that includes: a first multi-core optical fiber having a plurality of cores on the same circumference from a central axis in a cross section perpendicular to a long axis direction; a first ferrule incorporating the first multi-core optical fiber; a second multi-core optical fiber in which cores are arranged at respective positions corresponding to the plurality of cores of the first multi-core optical fiber in a cross section perpendicular to the long axis direction; a second ferrule incorporating the second multi-core optical fiber and having an outer diameter equal to that of the first ferrule; a split sleeve for accommodating the first ferrule and the second ferrule in such a manner that the first ferrule and the second ferrule are opposed to each other on a central axis; a slit space adjustment jig for adjusting a space of a slit of the split sleeve; and a rotation mechanism for rotating one of the first ferrule and the second ferrule around the central axis.

公开(公告)号：US20240027692A1

公开(公告)日：2024-01-25

申请号：US17424731

申请日：2020-01-10

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Chisato FUKAI ,  Kazunori KATAYAMA ,  Masaaki TAKAYA ,  Yoshiteru ABE ,  Ryo KOYAMA

IPC: G02B6/38 ,  B08B1/00

CPC classification number: G02B6/3866 ,  B08B1/008 ,  B08B2240/02

Abstract: An object is to provide an optical connector cleaning tool capable of simultaneously and appropriately cleaning an end surface and a side surface of a ferrule of an optical connector plug. The optical connector cleaning tool according to the present invention includes an end surface cleaning section including a cleaning sheet for cleaning a ferrule end surface of an optical connector plug, a side surface cleaning section including a cleaning thread bundle (or cleaning sheet) for cleaning a ferrule side surface of the optical connector plug, and a mechanism that reveals a new cleaning sheet and a new cleaning thread bundle (or cleaning sheet) at a predetermined position after each cleaning operation.

公开(公告)号：US20220113484A1

公开(公告)日：2022-04-14

申请号：US17287308

申请日：2019-10-09

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Masaaki TAKAYA ,  Yoshiteru ABE ,  Ryo KOYAMA ,  Chisato FUKAI ,  Kazunori KATAYAMA

IPC: G02B6/44

Abstract: To provide a connector plug that makes it possible to facilitate a plurality of persons' confirmation of a connector plug before its removal or after its insertion and to prevent erroneous work. The connector plug according to the present invention has a discoloration member mounted on a gripping portion for pinching during work. The color of the discoloration member changes due to heat of a worker's fingertips when the worker pinches the connector plug or pressure when the worker pinches the connector plug. The discoloration member is discolored by one worker pinching the connector plug. Another worker looks at the discolored discoloration member, and then is able to confirm whether the connector plug is a work target.

公开(公告)号：US20240061188A1

公开(公告)日：2024-02-22

申请号：US18270911

申请日：2021-01-20

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Chisato FUKAI ,  Yoshiteru ABE ,  Kunihiro TOGE ,  Kazunori KATAYAMA

IPC: G02B6/38 ,  G02B6/40

CPC classification number: G02B6/3885 ,  G02B6/403

Abstract: An object of the present disclosure is to enable a plurality of single-core fibers to be easily and collectively connected. The present disclosure relates to a cylindrical multi-core ferrule having a cylindrical shape and having through holes formed therein for holding a plurality of optical fibers on the same circle centered on a central axis of the cylindrical shape and an optical connector in which the cylindrical multi-core ferrule are disposed opposite to each other and a gap is formed between end surfaces of an optical fiber held by the cylindrical multi-core ferrule.

公开(公告)号：US20230318703A1

公开(公告)日：2023-10-05

申请号：US17928256

申请日：2020-06-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo KOYAMA ,  Masaaki TAKAYA ,  Yoshiteru ABE

IPC: H04B10/077

CPC classification number: H04B10/0775 ,  H04B2210/077

Abstract: For an optical monitor device that detects the intensity of light propagating through an optical fiber, a reduction in size and cost of the optical monitor device are to be achieved.
The present disclosure provides an optical monitor device including: an optical component that branches an incoming light at a specific branching ratio and outputs the majority thereof in a specific direction and the rest thereof in another specific direction; a plurality of incoming-side optical fibers through which light is to propagate and that are two-dimensionally arranged to cause the light to enter the optical component; a plurality of outgoing-side optical fibers through which light is to propagate and that are arranged to receive the most outgoing light from the optical component; a light-receiving element located to receive a partial outgoing light from the optical component; an incoming-side lens located between the optical component and the incoming-side optical fibers and that causes the incoming light into the optical component to be a parallel light; and an outgoing-side lens located between the optical component and the outgoing-side optical fibers and that efficiently couples the outgoing light from the optical component to the outgoing-side optical fibers.

公开(公告)号：US20210341684A1

公开(公告)日：2021-11-04

申请号：US17282981

申请日：2019-09-25

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Chisato FUKAI ,  Masaaki TAKAYA ,  Yoshiteru ABE ,  Ryo KOYAMA

IPC: G02B6/38 ,  B08B1/00

Abstract: An object is to provide an optical connector cleaning tool capable of cleaning both an end face and a side face of a ferrule of an optical connector plug simultaneously and simply and a method of cleaning an optical connector in such a manner. An optical connector cleaning tool according to the present invention includes superimposing a plurality of cleaning sheets on each other, the cleaning sheets each including a plurality of cleaning strings arranged so as to be parallel to each other in a sheet shape, such that orientations of the cleaning strings included in the respective cleaning sheets differ from each other, pressing an end face of a ferrule of an optical connector plug against the cleaning sheets to clean the end face of the ferrule, and subsequently, sticking the ferrule through the cleaning sheets to clean a side face of the ferrule.

公开(公告)号：US20240393540A1

公开(公告)日：2024-11-28

申请号：US18701661

申请日：2021-10-21

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tatsuya FUJIMOTO ,  Yoshiteru ABE ,  Ryo KOYAMA ,  Kazuhide NAKAE ,  Hiroshi WATANABE ,  Chisato FUKAI ,  Tomohiro KAWANO ,  Kazunori KATAYAMA

IPC: G02B6/35 ,  G02B6/38 ,  G02B6/40

Abstract: An object of this disclosure is to enable space saving of an optical fiber connection unit such as an optical switch.
According to this disclosure, there is provided an optical connection module that connects first and second multi-fiber connectors, in which the first and second multi-fiber connectors have optical fibers which are two-dimensionally arranged. In the first multi-fiber connector, optical fibers connected to a same optical switch are arranged in a vertical direction, and optical fibers connected to different optical switches are arranged in parallel in a horizontal direction. In the second multi-fiber connector, optical fibers connected to a same optical switch are arranged in a horizontal direction, and optical fibers connected to different optical switches are arranged in parallel in a vertical direction.

公开(公告)号：US20240329325A1

公开(公告)日：2024-10-03

申请号：US18697568

申请日：2021-10-11

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tatsuya FUJIMOTO ,  Kazunori KATAYAMA ,  Ryo KOYAMA ,  Kazuhide NAKAE ,  Hiroshi WATANABE ,  Yoshiteru ABE ,  Tomohiro KAWANO ,  Chisato FUKAI

IPC: G02B6/35

CPC classification number: G02B6/3566 ,  G02B6/3582 ,  G02B6/3588

Abstract: An object of the present disclosure is to provide an optical switch that does not require power supply.
The present disclosure is an optical switch including: an optical drive unit including an optical expansion body that expands by irradiation with light and contracts by blocking of light, a knock rod that converts the expansion and contraction of the optical expansion body into linear motion that reciprocates by a certain distance, and a rotary moving body that includes a rotor, and converts the linear motion into rotary motion that rotates by a certain angle about an axis of the rotor in accordance with the linear motion that reciprocates by a certain distance by the knock rod; and an optical switching unit including a first optical connection body to which one switching target optical fiber is fixed, a second optical connection body to which each optical fiber of a switching target optical fiber group is fixed, and a connection rotation body that is fixed to the rotor of the rotary moving body, rotates about the axis of the rotor, and switches and connects the one switching target optical fiber fixed to the first optical connection body in contact with one end surface and one optical fiber in the switching target optical fiber group fixed to the second optical connection body in contact with the other end surface.

公开(公告)号：US20240201450A1

公开(公告)日：2024-06-20

申请号：US18286196

申请日：2021-05-17

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yoshiteru ABE ,  Ryo KOYAMA ,  Chisato FUKAI ,  Kazunori KATAYAMA

IPC: G02B6/38 ,  B08B1/14 ,  B08B1/30 ,  B08B11/02

CPC classification number: G02B6/3866 ,  B08B1/143 ,  B08B1/30 ,  B08B11/02 ,  B08B2240/02

Abstract: An object of the present disclosure is to provide an optical connector cleaning tool capable of cleaning a ferrule end surface with an appropriate force regardless of an operator.
The present disclosure is an optical connector cleaning tool including a housing that stores a cleaning sheet, an opening portion through which a part of the cleaning sheet is exposed from the housing, a slide mechanism that causes the cleaning sheet exposed to the opening portion to slide, a cleaning sheet support portion that is fixed to the housing and supports the cleaning sheet toward the opening portion, a plug holding unit that holds an optical connector plug having a ferrule disposed at a distal end thereof at the opening portion, and a pressing portion that applies a pressing force between the cleaning sheet support portion and the plug holding unit.