公开(公告)号：US20250088777A1

公开(公告)日：2025-03-13

申请号：US18285625

申请日：2021-04-09

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yumiko SENOO ,  Kazutaka HARA ,  Shin KANEKO ,  Ryo KOMA ,  Kazuaki HONDA

IPC: H04Q11/00

Abstract: Provided is an optical access system that performs communication using an optical signal on which management control signals used for management and control are superimposed in a plurality of transmission lines connecting a plurality of subscriber devices, the optical access system including: a plurality of splitters that are provided for the respective transmission lines and split a plurality of optical signals transmitted from the plurality of subscriber devices; a monitoring unit configured to acquire the management control signals from each of the plurality of optical signals split by each of the plurality of splitters; and an output device that is provided between the monitoring unit and the plurality of splitters and outputs the plurality of optical signals split by the plurality of splitters to the monitoring unit.

公开(公告)号：US20250055568A1

公开(公告)日：2025-02-13

申请号：US18719033

申请日：2021-12-17

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo IGARASHI ,  Kazutaka HARA ,  Ryo KOMA ,  Takahiro SUZUKI

IPC: H04B10/293 ,  H04Q11/00

Abstract: A signal intensity flattening method includes: classifying a plurality of user devices accommodated in the same relay node so that user devices with similar optical signal intensities are in the same class; and setting a signal transmission path for converging optical signals transmitted from user devices of the same class in the same optical transmission line, and adjusting the signal intensities of the optical signals converged in the same optical transmission line collectively without separating them for each wavelength.

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：US20250088278A1

公开(公告)日：2025-03-13

申请号：US18705650

申请日：2021-12-06

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo IGARASHI ,  Kazutaka HARA ,  Ryo KOMA ,  Takahiro SUZUKI

IPC: H04B10/291 ,  H04B10/293

Abstract: An optical amplifier arrangement method includes an acquisition step of acquiring transmission path information indicating a configuration of a network that transmits an optical signal via a plurality of relay nodes and a transmission path of the optical signal transmitted by the network; and a determination step of determining arrangement of optical amplifiers in the network by grouping a plurality of optical fibers passing through the same relay node based on the transmission path information, and determining whether optical amplification is required in each of the relay nodes for each group of the optical fibers.

公开(公告)号：US20240056709A1

公开(公告)日：2024-02-15

申请号：US18275111

申请日：2021-08-26

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yumiko SENOO ,  Junichi KANI ,  Kazutaka HARA ,  Shin KANEKO ,  Ryo KOMA

IPC: H04Q11/00

CPC classification number: H04Q11/0062 ,  H04Q2011/0084

Abstract: An optical switch having a plurality of ports outputs an optical signal, which is input from one of the plurality of ports, from another port. A quality compensator perform quality compensation of the optical signal output from the optical switch, and input the quality-compensated optical signal to the optical switch. A controller selects, among the plurality of quality compensators, a quality compensator that performs quality compensation according to the degree of quality deterioration of the optical signal when the optical signal input from a predetermined port of the optical switch is transmitted through a transmission path. The controller controls the optical switch so that the optical signal, in which quality is compensated by the selected quality compensator through the optical signal input from the predetermined port being output to the selected quality compensator, is output from the port corresponding to a transmission destination of the optical signal.

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：US20240284081A1

公开(公告)日：2024-08-22

申请号：US18285591

申请日：2021-04-09

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yumiko SENOO ,  Kazutaka HARA ,  Shin KANEKO ,  Ryo KOMA ,  Kazuaki HONDA

IPC: H04Q11/00 ,  H04J14/08

CPC classification number: H04Q11/0067 ,  H04J14/08 ,  H04Q2011/0079 ,  H04Q2011/0086

Abstract: Provided a relay device that performs relay among a plurality of optical communication devices that perform communication using at least time division multiplexing, the device including a data length acquisition unit configured to acquire information on a data length of an uplink signal transmitted from the optical communication device using the uplink signal, a management control signal generation unit configured to generate a management control signal used for management and control, a management control signal division unit configured to divide the generated management control signal based on the information on the data length of the uplink signal acquired by the data length acquisition unit, and a management control signal superimposition unit configured to superimpose the divided management control signal on the uplink signal and transfers the superimposed signal to another optical communication device.

公开(公告)号：US20240187092A1

公开(公告)日：2024-06-06

申请号：US18285129

申请日：2021-04-09

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yumiko SENOO ,  Kazutaka HARA ,  Shin KANEKO ,  Ryo KOMA ,  Kazuaki HONDA

IPC: H04B10/077 ,  H04B10/27 ,  H04J14/02

CPC classification number: H04B10/0773 ,  H04B10/27 ,  H04J14/02

Abstract: An optical access system that performs communication using an optical signal in which a management control signal used for management and control is superimposed in a plurality of transmission lines connecting a plurality of subscriber devices, in which the plurality of subscriber devices generates a plurality of optical signals by superimposing the management control signals of different frequencies on main signals of different wavelengths, and transmits the plurality of optical signals that has been generated, and the optical access system includes a monitoring unit that receives the plurality of optical signals transmitted from the plurality of corresponding subscriber devices, and acquires a plurality of management control signals of different frequencies from the plurality of corresponding optical signals that has been received.

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：US20230421283A1

公开(公告)日：2023-12-28

申请号：US18035900

申请日：2020-11-17

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yumiko SENOO ,  Shin KANEKO ,  Ryo KOMA ,  Kazuaki HONDA

IPC: H04J14/08

CPC classification number: H04J14/08

Abstract: An optical communication device that communicates with another optical communication device by using at least a time division multiplexing system, the optical communication device including: a management control signal division unit that divides a management control signal used for management and control; and a transmission unit that transmits the management control signal divided, by including the management control signal divided in a burst signal to be transmitted at an assigned transmission timing.