公开(公告)号：US20250070868A1

公开(公告)日：2025-02-27

申请号：US18726086

申请日：2022-01-14

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomohiro KAWANO ,  Tatsuya FUJIMOTO ,  Kazuhide NAKAE ,  Hiroshi WATANABE ,  Kazunori KATAYAMA

IPC: H04B10/071 ,  H04B10/50 ,  H04J14/02

Abstract: It is aimed to provide an optical node, a remote control system, and a remote control method capable of improving a communication speed of an uplink signal.
An optical node 30 according to the present invention includes a wavelength division multiplexing (WDM) coupler 33 which splits laser beams having a plurality of wavelengths supplied through the optical fiber 20 for each wavelength, the photoelectric conversion element 34 that receives and photoelectrically converts at least one of the laser beams split for each wavelength, a power storage unit 35 that stores electric power from the photoelectric conversion element 34, the reflection switches (38 to 40) that switch the other laser beams split for each wavelength between a reflection state and a non-reflection state and return the reflected laser beams to the optical fiber 20 via the WDM coupler 33, and a control unit 37 that divides information of the modules (31 and 32) into drive signals, and drives each of the reflection switches (38 to 40) by using electric power of the power storage unit 35.

公开(公告)号：US20250133315A1

公开(公告)日：2025-04-24

申请号：US18683677

申请日：2021-08-16

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kazuhide NAKAE ,  Kazunori KATAYAMA ,  Ryo KOYAMA ,  Hiroshi WATANABE ,  Tomohiro KAWANO ,  Tatsuya FUJIMOTO

IPC: H04Q11/00

Abstract: The present disclosure is an optical line switching node device N which includes an optical switch part 2 which performs optical path switching between communication optical fibers F-0, F-1; a communication optical signal extraction part 5-0, 5-1 which extracts some of communication optical signals from one or both of the communication optical fibers F-0, F-1 and photoelectrically converts the extracted some of the communication optical signals; and a communication optical signal storage part 6 which stores some of communication optical signals photoelectrically converted in the communication optical signal extraction part 5-1, 5-1 and uses the stored energy to drive the optical switch part 2.

公开(公告)号：US20240264381A1

公开(公告)日：2024-08-08

申请号：US18291569

申请日：2021-08-06

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tatsuya FUJIMOTO ,  Chisato FUKAI ,  Tomohiro KAWANO ,  Hiroshi WATANABE ,  Kazuhide NAKAE ,  Kazunori KATAYAMA

IPC: G02B6/35

CPC classification number: G02B6/3504

Abstract: An object of the present disclosure is to provide an optical switch that does not require power supply. The present disclosure provides an optical switch which includes: a light driving rotation unit including: a light-expansion body which expands by irradiating light and contracts by interrupting light; a knock rod for converting expansion/contraction of the light-expansion body into reciprocating linear motion by a constant distance; and a rotary motion body for correspondingly converting reciprocating linear motion by the constant distance of the knock rod into rotating rotary motion by a constant angle; and a optical switching rotation unit including: a first optical connector to which one switching object optical fiber is fixed; a second optical connector to which an optical fiber of a switching object optical fiber group is respectively fixed; and a connecting rotor for rotating around an axis in synchronization with rotation converted by the rotary motion body, and for switching/connecting one switching object optical fiber fixed to the first optical connector in contact with one end face and one optical fiber in the switching object optical fiber group fixed to the second optical connector in contact with other end face

公开(公告)号：US20250168538A1

公开(公告)日：2025-05-22

申请号：US18839696

申请日：2022-03-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kazuhide NAKAE ,  Kazunori KATAYAMA ,  Hiroshi WATANABE ,  Tomohiro KAWANO ,  Tatsuya FUJIMOTO

IPC: H04Q11/00 ,  H04B10/077 ,  H04J14/02

Abstract: The present disclosure is an optical path switching node including: a four-way optical switch capable of switching to any one of a first connection state in which a first port and a second port are connected internally, and a third port and a fourth port are connected internally, a second connection state in which the first port and the third port are connected internally, and the second port and the fourth port are connected internally, and a third connection state in which the first port and the fourth port are connected internally, and the second port and the third port are connected internally; a first optical coupler that couples test light to an optical path from the first port in an external direction of the four-way optical switch; a second optical coupler that couples test light to an optical path from the second port in an external direction of the four-way optical switch; a third optical coupler that couples test light to an optical path from the third port in an external direction of the four-way optical switch; and a fourth optical coupler that couples test light to an optical path from the fourth port in an external direction of the four-way optical switch.

公开(公告)号：US20240280758A1

公开(公告)日：2024-08-22

申请号：US18572061

申请日：2021-07-09

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomohiro KAWANO ,  Kazunori KATAYAMA ,  Kazuhide NAKAE ,  Hiroshi WATANABE ,  Tatsuya FUJIMOTO

IPC: G02B6/35

CPC classification number: G02B6/354 ,  G02B6/3588

Abstract: An object of the present invention is to provide an optical node capable of compensating for a rotation angle deviation of an optical fiber core of a ferrule rotation type optical switch and reducing a connection loss generated in the optical switch.
An optical node according to the present disclosure includes: an input-side optical port to which optical test light is input; a first optical switch connected to the input-side optical port and having a plurality of channels; a first rotation mechanism that rotates the first optical switch; a second optical switch connected to the first optical switch and having a plurality of channels; a second rotation mechanism that rotates the second optical switch; an output-side port which is connected to the second optical switch and from which the optical test light is output; an optical port monitoring unit that performs optical intensity measurement of the optical test light passing through the output-side port; and an optical node control unit that is connected to the first rotation mechanism, the second rotation mechanism, and the optical port monitoring unit, causes the optical port monitoring unit to perform the optical intensity measurement after rotating the optical switch by a minute angle for each of a designated channel of the first optical switch and a designated channel of the second optical switch, extracts a rotation angle of the optical switch at which the optical intensity of the optical test light becomes a maximum value, and performs rotation angle deviation compensation for updating a database representing the rotation angle of each designated channel.

公开(公告)号：US20250130371A1

公开(公告)日：2025-04-24

申请号：US18686811

申请日：2021-09-01

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tatsuya FUJIMOTO ,  Tomohiro KAWANO ,  Kazuhide NAKAE ,  Hiroshi WATANABE ,  Kazunori KATAYAMA

IPC: G02B6/35

Abstract: An object of the present disclosure is to provide an optical switch and an optical switch system capable of achieving optical path switching with less power. In order to achieve the above object, an optical switch according to the present disclosure includes a plate-shaped cladding provided with a trench in a thickness direction, opposing lenses exposed to the trench, two optical waveguides coaxially arranged inside the cladding, respective one ends of the optical waveguides being exposed to a surface of the cladding and respective other ends of the optical waveguides opposing each other in the trench via the opposing lenses, a movable transparent body that transmits light of the opposing lenses when the transparent body is sandwiched by the opposing lenses in the trench, and a movable double-sided mirror that reflects light incident from the opposing lenses in a direction opposite to an incident direction when the double-sided mirror is sandwiched between the opposing lenses in the trench.

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.