公开(公告)号：US20230170999A1

公开(公告)日：2023-06-01

申请号：US17919595

申请日：2020-04-24

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takuya KANAI ,  Shin KANEKO ,  Kazuaki HONDA ,  Junichi KANI ,  Hiroo SUZUKI

IPC: H04B10/516 ,  H04J14/00

CPC classification number: H04B10/516 ,  H04J14/00

Abstract: An aspect of the present disclosure is a transmission system including a modulated wave generation unit that generates an intermediate wave, which is a coherent wave in which a frequency component of either of two signals overlays a frequency spectrum, the two signals being a main signal indicating transmitted information to be transmitted and a control signal indicating management information, which is information on communication between a transmission source of the transmitted information and a communication destination of the transmission source, and a modulation unit that modulates the intermediate wave with a signal in which a frequency component does not overlay the frequency spectrum of the coherent wave generated by the modulated wave generation unit out of the two signals that are the main signal and the control signal. In the transmission system, a frequency band of the main signal and a frequency band of the control signal do not overlap each other.

公开(公告)号：US20220368427A1

公开(公告)日：2022-11-17

申请号：US17623852

申请日：2019-07-01

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo IGARASHI ,  Takuya KANAI ,  Masamichi FUJIWARA ,  Junichi KANI

IPC: H04B10/61 ,  H04J14/02

Abstract: An optical reception device including: a local light transmission unit configured to generate a plurality of local lights having different wavelengths, select a local light having a wavelength that is close to the wavelength of a received optical signal from among the plurality of generated local lights having different wavelengths, and transmit the selected local light to a coherent receiver; a demultiplexing unit configured to demultiplex a received optical signal and transmit the demultiplexed optical signal to the coherent receiver via a first path; and a wavelength detection unit configured to input the optical signal demultiplexed by the demultiplexing unit via a second path, split the input optical signal into different paths according to wavelengths by using a wavelength multiplexer/demultiplexer, and output, to the local light transmission unit, a control signal for causing the local light transmission unit to output a local light having a frequency that corresponds to a path in which the optical signal is included.

公开(公告)号：US20250096902A1

公开(公告)日：2025-03-20

申请号：US18294288

申请日：2021-08-03

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo KOMA ,  Junichi KANI ,  Kazutaka HARA ,  Takuya KANAI

IPC: H04B10/516 ,  H04B10/27

Abstract: An aspect of the present invention is an optical transmitter including: a first modulation unit configured to generate an optical modulated signal through intensity modulation of an optical signal; a second modulation unit configured to generate an optical modulated signal through phase/frequency modulation of the optical signal; and a modulation scheme switching unit configured to switch a modulator of the optical signal to one of the first and second modulation units. The modulation scheme switching unit switches the modulator to a modulation unit corresponding to a device of a connection destination between the first and second modulation units.

公开(公告)号：US20250016480A1

公开(公告)日：2025-01-09

申请号：US18709995

申请日：2021-11-19

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Shin KANEKO ,  Takuya KANAI ,  Tomoaki YOSHIDA

IPC: H04Q11/00

Abstract: An aspect of the present invention is an optical transmission device including a connector that is able to be connected to an accommodation module accommodating an optical fiber such that optical communication is performed, an optical switch that receives an optical signal from the connector and outputs an optical signal to the connector, an optical switch controller that controls the optical switch, an up wavelength multiplexer/demultiplexer that multiplexes light of a plurality of wavelengths output from the optical switch and outputs the multiplexed light to a transmission line, and a down wavelength multiplexer/demultiplexer that demultiplexes light input from the transmission line and outputs the demultiplexed light to the optical switch, wherein the connector can be connected to any one of a one-core accommodation module and a two-core accommodation module as the accommodation module.

公开(公告)号：US20240276128A1

公开(公告)日：2024-08-15

申请号：US18289916

申请日：2021-08-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yumiko SENOO ,  Kazutaka HARA ,  Shin KANEKO ,  Takuya KANAI ,  Kazuaki HONDA ,  Junichi KANI

IPC: H04Q11/00

CPC classification number: H04Q11/0067 ,  H04Q11/0005 ,  H04Q2011/0016 ,  H04Q2011/0086

Abstract: A communication method includes, in a state where first information equipment and second information equipment are communicatively connected via optical switches and an optical communication network, switching, by an optical switch to which the first information equipment is connected, a connection destination of the first information equipment from an input/output port connected to the optical communication network to a control port to which the control device is connected in response to a predetermined operation of the first information equipment, receiving, by the control device, information indicating third information equipment that is a communication connection destination different from the second information equipment via the control port of the optical switches from the first information equipment, allocating, by the control device, a wavelength used for communication to the first information equipment and the third information equipment based on information indicating the communication connection destination, and connecting, by the control device, the first information equipment to the third information equipment so as to be communicable by controlling connection of an input/output port of the optical switches.

公开(公告)号：US20240031035A1

公开(公告)日：2024-01-25

申请号：US18026559

申请日：2020-09-23

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo IGARASHI ,  Masamichi FUJIWARA ,  Takuya KANAI

IPC: H04B10/61

CPC classification number: H04B10/616

Abstract: A coherent optical reception device includes a coherent receiver that receives signal light in which an AMCC signal is superimposed on a main signal by phase modulation and outputs a reception signal and a digital signal processor, in which a modulation signal of the AMCC signal superimposed on the main signal is multiplied by a clock, the digital signal processor includes a symbol output, an AMCC signal code sequence demodulator, and a main signal code sequence demodulator, and the AMCC signal code sequence demodulator includes a main signal component remover that removes the main signal included in the reception signal output from the symbol output, and a clock component remover that removes a clock component included in the reception signal from which the main signal has been removed by the main signal component remover.

公开(公告)号：US20230308174A1

公开(公告)日：2023-09-28

申请号：US18022887

申请日：2020-08-24

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Shin KANEKO ,  Kazuaki HONDA ,  Hiroo SUZUKI ,  Junichi KANI ,  Takuya KANAI ,  Yasunari TANAKA

IPC: H04B10/032 ,  H04B10/079

CPC classification number: H04B10/032 ,  H04B10/07957

Abstract: The optical communication system includes the optical distribution device (100) provided between the wavelength routing device (30) and the optical multiplexing/demultiplexing device (40). The wavelength routing device outputs the optical signal input from the port on the wavelength variable subscriber device side to the port uniquely determined by a combination of the wavelength of the optical signal and the port to which the optical signal is inputted. The wavelength variable subscriber device can execute the first protection for switching the wavelength of the optical signal to be transmitted and received to the spare wavelength different from the operating wavelength when the wavelength variable subscriber device and the wavelength variable communication device (10) are disconnected. Then, the optical distribution device can execute the second protection for switching the optical fiber transmission path (50) to be used when the wavelength variable subscriber device and the wavelength variable communication device are disconnected.

公开(公告)号：US20230188208A1

公开(公告)日：2023-06-15

申请号：US17924149

申请日：2020-05-28

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo IGARASHI ,  Masamichi FUJIWARA ,  Takuya KANAI

IPC: H04B10/071

CPC classification number: H04B10/071

Abstract: A light leakage confirmation method comprising: an excitation light incident step in which an excitation light output unit connected to a first end of a first optical transmission line outputs an excitation light and makes the excitation light incident on the first optical transmission line; a reflection step in which an excitation light reflection unit connected to a second end of the first optical transmission line reflects the excitation light which has been incident in the excitation light incident step; a reflected light incident step of making a reflected light which has been reflected in the reflection step incident on the first optical transmission line; a reflected light measurement step in which the excitation light output unit measures an intensity of the reflected light; and a leakage determination step of determining whether or not the excitation light is leaked on a basis of the intensity of the excitation light and the intensity of the reflected light which has been measured in the reflected light measurement step.

公开(公告)号：US20230163852A1

公开(公告)日：2023-05-25

申请号：US17908527

申请日：2020-03-04

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo IGARASHI ,  Masamichi FUJIWARA ,  Kazutaka HARA ,  Takuya KANAI ,  Yasutaka KIMURA ,  Atsuko KAWAKITA

IPC: H04B10/2575 ,  H04B10/278 ,  H04J14/02

CPC classification number: H04B10/25756 ,  H04B10/278 ,  H04J14/0202

Abstract: An optical communication system configured with a station-side apparatus and a plurality of subscriber-side apparatuses in a bus network topology includes an optical amplification unit installed on a station side, and a drop unit configured to branch an optical signal and excitation light, wherein the optical amplification unit includes an amplifier configured to amplify a downlink signal, and an excitation light output unit configured to output the excitation light for amplifying an uplink signal to a communication path, and the drop unit changes a branching ratio in accordance with a wavelength of the optical signal so that a transmission loss of the excitation light with respect to a trunk fiber is reduced.

公开(公告)号：US20220368417A1

公开(公告)日：2022-11-17

申请号：US17623967

申请日：2019-07-01

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Takeshi IMAI ,  Kota ASAKA ,  Takuya KANAI

IPC: H04B10/114

Abstract: A station-side telescope included in a station-side optical antenna unit is configured to transmit and receive an optical signal, a guide light source is configured to emit guide light in a direction of orientation of the station-side telescope, a node-side telescope is configured to transmit and receive an optical signal, a node-side control unit included in a node-side optical antenna unit is configured to generate and output a control signal for moving a node-side base based on a position of the guide light included in an image obtained by a camera capturing the guide light emitted by the guide light source so that a direction of orientation of the node-side telescope faces the direction of orientation of the station-side telescope, an antenna drive unit is configured to receive the control signal and generate and output a drive signal based on the control signal, and the node-side base included in the node-side optical antenna unit is configured to support the node-side telescope and receive the drive signal to change a direction of orientation of the node-side telescope.