公开(公告)号：US20240388821A1

公开(公告)日：2024-11-21

申请号：US18691749

申请日：2021-09-16

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Shin KANEKO ,  Takuya KANAI ,  Kazutaka HARA ,  Junichi KANI

IPC: H04Q11/00 ,  H04J14/02 ,  H04L41/34

Abstract: An optical communication system including: a management control device that manages communication between one or more first subscriber devices and one or more second subscriber devices that are provided at counterpart locations of the one or more first subscriber devices, in which the management control device includes a control signal generation unit that generates a control signal that is transmitted to the one or more first subscriber devices and used for management and control, and an optical transmission unit that converts the control signal generated by the control signal generation unit into an optical signal with a wavelength that is different from a wavelength of a main signal transmitted by the one or more second subscriber devices that perform communication with the one or more first subscriber devices and transmits the optical signal, and the optical communication system includes an optical multiplexing unit that is provided on a communication path between the one or more first subscriber devices and the one or more second subscriber devices and multiplexes the main signal transmitted by the one or more second subscriber devices with the optical signal transmitted from the optical transmission unit.

公开(公告)号：US20240178921A1

公开(公告)日：2024-05-30

申请号：US18276985

申请日：2021-02-16

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo KOMA ,  Junichi KANI

IPC: H04B10/61 ,  H04B10/077

CPC classification number: H04B10/6164 ,  H04B10/0775

Abstract: A reception unit, in which a range of an electric band is in a range from −Be to +Be and Be >B/2 is satisfied, receives signal light of a symbol rate B generated by optically modulating transmission data, performs digital coherent reception by interfering the received signal light with the local oscillation light generated by the local oscillation light source, converts the signal light into an electric digital signal, and output the digital signal, and a frequency offset compensation unit provided in a digital signal processing unit estimates a frequency offset amount generated in the digital signal in a range of −B/2 or more and +B/2 or less in accordance with a frequency difference between the signal light and the local oscillation light, and perform frequency offset compensation for the digital signal on the basis of the estimated frequency offset amount to compensate the frequency offset amount in a range of −B/2 or more and +B/2 or less and compensate so as to remain the frequency offset amount of an integral multiple of the symbol rate B when the frequency offset amount is in a range of less than −B/2 and a range of more than +B/2.

公开(公告)号：US20230275664A1

公开(公告)日：2023-08-31

申请号：US18017663

申请日：2020-07-27

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Keita NISHIMOTO ,  Kota ASAKA ,  Junichi KANI

IPC: H04B10/2581 ,  H04B10/50 ,  H04L12/44

CPC classification number: H04B10/2581 ,  H04B10/501 ,  H04L12/44

Abstract: An optical communication system allowing for transmission and reception of, between a dynamic bandwidth allocation functional unit that dynamically allocates a bandwidth for uplink communication and a subscriber-side communication device, transmission volume information indicating the amount of information waiting to be transmitted that is stored in the subscriber-side communication device and transmission instruction information for a provider-side communication device to instruct the subscriber-side communication device on a transmission timing for transmitting the transmission volume information, the optical communication system including: a transmission instruction information encoder that acquires multi-level transmission instruction information from the dynamic bandwidth allocation functional unit, converts the multi-level transmission instruction information into binary transmission instruction information, and transmits the encoded binary transmission instruction information to a transmission instruction information decoder; a transmission instruction information decoder that converts the decoded binary transmission instruction information into multi-level transmission instruction information, and outputs the multi-level transmission instruction information to the subscriber-side communication device; a transmission volume information encoder that acquires multi-level transmission volume information from the subscriber-side communication device, converts the multi-level transmission volume information into binary transmission volume information, and transmits the encoded binary transmission volume information to a transmission volume information decoder; and a transmission volume information decoder that converts the decoded binary transmission volume information into multi-level transmission volume information, and outputs the multi-level transmission volume information to the dynamic bandwidth allocation functional unit.

公开(公告)号：US20230246876A1

公开(公告)日：2023-08-03

申请号：US18007645

申请日：2020-06-08

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Noriko IIYAMA ,  Masamichi FUJIWARA ,  Hiroo SUZUKI ,  Junichi KANI

IPC: H04L12/44 ,  H04L5/00

CPC classification number: H04L12/44 ,  H04L5/0048

Abstract: A communication device includes: a MAC unit that processes a main signal including a payload, and determines a communication timing of the main signal; a communication unit that performs, based on the communication timing, at least one of transmission processing for E/O converting the main signal acquired from the MAC unit, and transmitting the main signal to a communication counterpart device, and reception processing for O/E converting the main signal received from the communication counterpart device; a main signal transmission line through which the main signal is transmitted between the MAC unit and the communication unit; and a control information transmission line that is provided separately from the main signal transmission line, and through which communication timing data that is data indicating the communication timing is transmitted from the MAC unit to the communication unit.

公开(公告)号：US20230216591A1

公开(公告)日：2023-07-06

申请号：US18008523

申请日：2020-06-08

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Kota Asaka ,  Keita NISHIMOTO ,  Yukio TOYOSHIMA ,  Takashi YAMADA ,  Junichi KANI

IPC: H04B10/291 ,  H04B10/27

CPC classification number: H04B10/291 ,  H04B10/27

Abstract: One aspect of the present invention is a optical main signal processing node apparatus including: an input port for inputting an optical multiplexed with signals pertaining to a plurality of services from an optical transmission path; an output port for outputting an optical signal multiplexed with signals pertaining to a plurality of services to an optical transmission path; a optical main signal processer configured to perform optical main signal processing on an optical signal input from the input port; and a path switch configured to switch a path of the optical signal input from the input port to one of a first path for guiding the optical signal to the output port and a second path for guiding the optical signal to the optical main signal processer.

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：US20220021617A1

公开(公告)日：2022-01-20

申请号：US17311950

申请日：2019-12-04

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yumiko SENOO ,  Takahiro SUZUKI ,  Junichi KANI ,  Hirotaka UJIKAWA

IPC: H04L12/813 ,  H04L12/44 ,  H04L12/863 ,  H04L12/801 ,  H04B10/27

Abstract: A communication system includes a subscriber network unit and a communication device provided in an accommodating station. The subscriber network unit includes an acquisition unit that acquires uplink data from one or more lower-layer devices. The communication device includes: a data processing unit that acquires the uplink data from the subscriber network unit using a band of uplink communication and executes data processing on the acquired uplink data; a policy determination unit that determines a policy of band allocation of the uplink communication on the basis of the result of the data processing; and an allocation control unit that allocates the band of the uplink communication to the subscriber network unit on the basis of the policy.

公开(公告)号：US20250088269A1

公开(公告)日：2025-03-13

申请号：US18721550

申请日：2021-12-21

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yasunari TANAKA ,  Kazutata HARA ,  Takuya KANAI ,  Shin KANEKO ,  Yumiko SENOO ,  Junichi KANI

IPC: H04B10/079 ,  H04B10/25

Abstract: One aspect of the present invention is an optical communication control device including an acquisition unit that acquires an optical power of an optical signal transmitted from a transmission device, a derivation unit that derives an attenuation amount for setting the optical power of the optical signal transmitted from the transmission device to an optical power receivable by a receiver device in a case in which the optical power acquired by the acquisition unit exceeds the optical power receivable by the receiver device, and an attenuation unit that causes an attenuator that attenuates the optical power of the optical signal transmitted from the transmission device to attenuate the optical power with the attenuation amount derived by the derivation unit.

公开(公告)号：US20240381012A1

公开(公告)日：2024-11-14

申请号：US18286401

申请日：2021-04-19

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC: H04Q11/00

Abstract: Provided is an optical access system that performs communication using an optical signal on which a management control signal used for management and control is superimposed, the optical access system including: a subscriber device on a transmitting side that generates an optical signal by superimposing the management control signal on a main signal and transmits the generated optical signal; a management control unit that outputs a management control signal which is superimposed on the optical signal transmitted by the subscriber device on the transmitting side and which has a frequency band different from a frequency of the management control signal superimposed on the optical signal; and a control signal superimposing unit that superimposes the management control signal output from the management control unit on the optical signal.