公开(公告)号：US20240200950A1

公开(公告)日：2024-06-20

申请号：US18287979

申请日：2021-05-20

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kazutaka HARA ,  Ryo IGARASHI ,  Junichi KANI ,  Naotaka SHIBATA ,  Takeshi IMAI

IPC: G01C21/20 ,  H04B10/116

CPC classification number: G01C21/206 ,  H04B10/116

Abstract: An aspect of the present invention is a moving body that moves along a rail, the moving body including: a light emission unit; a movement control unit that controls the moving body so as to move on the rail at a predetermined speed; a measurement unit that measures a movement time of moving from a predetermined position on the rail; and a transmission unit that transmits a signal indicating position information corresponding to the movement time measured by the measurement unit by using the light emission unit.

公开(公告)号：US20230403082A1

公开(公告)日：2023-12-14

申请号：US18035007

申请日：2020-11-12

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo KOMA ,  Kazutaka HARA ,  Junichi KANI

IPC: H04B10/85

CPC classification number: H04B10/85

Abstract: An optical line terminal includes a communication unit configured to communicate with a plurality of optical network units, and a control unit configured to dynamically change at least one of a time width of a specific period and a cycle of the specific period, the specific period being a period in which an authentication request signal is received from the new optical network unit via the communication unit.

公开(公告)号：US20230361876A1

公开(公告)日：2023-11-09

申请号：US18028414

申请日：2020-09-30

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yasunari TANAKA ,  Junichi KANI ,  Hiroo SUZUKI ,  Takuya KANAI

IPC: H04B10/25 ,  H04B10/40

CPC classification number: H04B10/2589 ,  H04B10/40

Abstract: An optical communication system includes: an optical fiber including a plurality of cores formed in parallel to a longitudinal direction; a first optical communication device including an optical transmission unit and an optical reception unit, and provided with connection ends of the optical transmission unit and the optical reception unit each connected to one end of any one of the cores on an interface surface; and a second optical communication device including an optical transmission unit and an optical reception unit, and provided with connection ends of the optical transmission unit and the optical reception unit each connected to another end of any one of the cores on an interface surface, in which the connection ends are provided in an arrangement in which a type of transmission and reception of one of the connection ends of the first optical communication device and a type of transmission and reception of one of the connection ends of the second optical communication device are a transmission and reception pair, the one of the connection ends of the first optical communication device and the one of the connection ends of the second optical communication device being in a line-symmetric positional relationship with respect to a vertical line to a horizontal plane of when the first optical communication device and the second optical communication device are installed on the horizontal plane such that the interface surfaces of the first optical communication device and the second optical communication device face a front.

公开(公告)号：US20230318713A1

公开(公告)日：2023-10-05

申请号：US18024853

申请日：2020-09-09

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo IGARASHI ,  Masamichi FUJIWARA ,  Junichi KANI

IPC: H04B10/516 ,  H04B10/50 ,  H04B10/64

CPC classification number: H04B10/516 ,  H04B10/503 ,  H04B10/64

Abstract: An optical transmission apparatus includes an optical transmitter that generates an optical signal in an uplink direction by modulating output light of a laser that outputs light of a first frequency with a subcarrier on which transmission data is superimposed, a heterodyne detection unit that receives an optical signal in a downlink direction by heterodyne detection, a control unit that calculates a first intermediate frequency based on the frequency of the downlink signal received by the heterodyne detection and the first frequency of the laser, and controls the first frequency of the laser when there is a difference between the calculated first intermediate frequency and a reference second intermediate frequency by a threshold or more.

公开(公告)号：US20230261778A1

公开(公告)日：2023-08-17

申请号：US18015849

申请日：2020-07-17

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Keita NISHIMOTO ,  Kota ASAKA ,  Junichi KANI

IPC: H04J14/02

CPC classification number: H04J14/021

Abstract: A transmitter management device includes: a reception unit that receives a virtual switch configuration request from an upper management system; a determination unit that determines a plurality of paths including transfer processing by different optical transmitters on the basis of the configuration request received by the reception unit; and a setting unit that performs a setting for a plurality of the optical transmitters in such a way that a virtual switch that executes transfer processing on the basis of the paths determined by the determination unit is configured for each one of a plurality of the paths.

公开(公告)号：US20230030158A1

公开(公告)日：2023-02-02

申请号：US17788537

申请日：2020-09-29

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takuya KANAI ,  Hiroo SUZUKI ,  Junichi KANI ,  Shin KANEKO ,  Kazuaki HONDA ,  Manabu YOSHINO ,  Tomoaki YOSHIDA

IPC: H04B10/291 ,  H04B10/27

Abstract: An optical communication apparatus includes an optical switch, a wavelength management control unit, and an optical switch control unit. The optical switch is connected to a plurality of transmission lines and outputs an optical signal input from one of the transmission lines to another of the transmission lines. The wavelength management control unit assigns a wavelength to a subscriber terminal according to a communication destination. The optical switch control unit controls the optical switch such that it outputs an optical signal transmitted from the subscriber terminal, to which a wavelength has been assigned, to a transmission line corresponding to its forwarding destination on a path to the communication destination.

公开(公告)号：US20210392064A1

公开(公告)日：2021-12-16

申请号：US17287082

申请日：2019-10-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takahiro SUZUKI ,  Sang-Yuep KIM ,  Junichi KANI

IPC: H04L12/26

Abstract: Provided is a communication device including: a transmission timing calculation unit configured to calculate a transmission timing of a first frame using the number of transmitted bits from a predetermined timing to transmission of the first frame and a throughput; a transmission unit configured to transmit the first frame to an external device at the transmission timing; a reception unit configured to receive a second frame from the external device in response to the first frame; a reception timing calculation unit configured to calculate a reception timing of the second frame using the number of received bits from a predetermined timing to reception of the second frame by the reception unit and a throughput; and a round trip time calculation unit configured to calculate a round trip time using a processing time required by the external device from the reception of the first frame to the transmission of the second frame, the transmission timing, and the reception timing.

公开(公告)号：US20210117178A1

公开(公告)日：2021-04-22

申请号：US17045987

申请日：2019-04-08

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takumi HARADA ,  Manabu YOSHINO ,  Junichi KANI

IPC: G06F8/65 ,  G06F12/02

Abstract: A communication apparatus includes: a memory that stores, first data on firmware before update, second data on firmware after the update, and a table in which the first data or the second data is associated with an address where the first data or the second data is positioned; and a processor that executes processing based on the first data or the second data positioned at the address defined in the table.