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    OPTICAL NODE DEVICE
    11.
    发明申请
    OPTICAL NODE DEVICE 有权

    公开(公告)号：US20210036781A1

    公开(公告)日：2021-02-04

    申请号：US16967691

    申请日：2019-02-08

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Hirotaka ONO ,  Kazunori SENOO ,  Kenya SUZUKI ,  Keita YAMAGUCHI ,  Mitsunori FUKUTOKU ,  Shingo KAWAI ,  Yutaka MIYAMOTO

    IPC: H04B10/294

    Abstract: An optical node device includes: a multicore optical amplification unit that amplifies collectively light transmitted along a multicore fiber; a separation unit that inputs the amplified light in each core to each of a plurality of input-side single-core fibers; an optical cross-connect switch that attenuates the light input from each of the plurality of input-side single-core fibers through an optical attenuator, separates the light in accordance with a wavelength, and outputs the separated light to an output-side single-core fiber of a plurality of output-side single-core fibers related to a respective output destination; a plurality of single-core optical amplification units that amplify the light transmitted along the corresponding output-side single-core fibers; and an output unit that outputs the light transmitted along each of the plurality of output-side single-core fibers to a multicore fiber. A control unit controls the optical attenuator and the single-core optical amplification unit based on input signal optical power and output optical signal power.

    COMMUNICATION SYSTEM AND CONNECTOR
    12.
    发明申请
    COMMUNICATION SYSTEM AND CONNECTOR 审中-公开

    公开(公告)号：US20180341060A1

    公开(公告)日：2018-11-29

    申请号：US15776566

    申请日：2016-11-22

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Takuya ODA ,  Tetsuro INUI ,  Akira HIRANO ,  Wataru IMAJUKU ,  Shoukei KOBAYASHI ,  Takafumi TANAKA ,  Yutaka MIYAMOTO ,  Hidehiko TAKARA

    IPC: G02B6/02 ,  H04B10/27 ,  G02B6/26 ,  H04J14/04 ,  H04J14/02 ,  H04B10/2581

    Abstract: A communication system includes three or more nodes and a multi-core fiber having a plurality of cores, the multi-core fiber being used in at least a partial segment of the connection between the nodes is provided. One node of the nodes is connected to the multi-core fiber and includes a connector configured to add and drop a signal to and from an allocated core exclusively allocated from among the cores as a communication path between the one node and another node of the nodes and/or configured to relay a signal transmitted through another core of the cores allocated for communication between other nodes in the multi-core fiber connected to the one node, and a relative positional relationship between a connection position of the allocated core in which a signal is added or dropped in the connector and a connection position of another core in which a signal is relayed in the connector is the same for all of the nodes connected to the multi-core fiber.

    SIGNAL PROCESSING APPARATUS, SIGNAL PROCESSING METHOD AND COMMUNICATION SYSTEM
    14.
    发明公开
    SIGNAL PROCESSING APPARATUS, SIGNAL PROCESSING METHOD AND COMMUNICATION SYSTEM 审中-公开

    公开(公告)号：US20240267129A1

    公开(公告)日：2024-08-08

    申请号：US18565433

    申请日：2021-06-08

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Masanori NAKAMURA ,  Takayuki KOBAYASHI ,  Yoshiaki KISAKA ,  Yutaka MIYAMOTO

    IPC: H04B10/61

    CPC classification number: H04B10/6161 ,  H04B10/613

    Abstract: A receiver convolves an impulse response for compensating for frequency characteristics and a complex impulse response for wavelength dispersion compensation with each of a real component and an imaginary component of each polarized wave of a reception signal. For each polarized wave, the receiver performs complex signal processing of multiplying the imaginary component by the imaginary unit, then branching the resulting component, and adding one imaginary component to the real component. For each polarized wave, the receiver uses, as input signals, the real component and the imaginary component of each polarized wave after complex signal processing and the phase conjugates of them. For each polarized wave, the receiver adds a signal obtained by a process in which each of the real component and the imaginary component of each polarized wave is multiplied by a complex impulse response, the resulting components are added, and a phase rotation is applied and a signal obtained by a process in which each of the phase conjugate of the real component and the phase conjugate of the imaginary component of each polarized wave is multiplied by a complex impulse response, the resulting components are added, and an opposite phase rotation is applied, and adds a transmission data bias correction signal.

    OPTICAL TRANSMISSION SYSTEM, OPTICAL TRANSMISSION APPARATUS AND OPTICAL TRANSMISSION METHOD
    15.
    发明申请
    OPTICAL TRANSMISSION SYSTEM, OPTICAL TRANSMISSION APPARATUS AND OPTICAL TRANSMISSION METHOD 有权

    公开(公告)号：US20230054203A1

    公开(公告)日：2023-02-23

    申请号：US17800195

    申请日：2020-02-18

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Koki SHIBAHARA ,  Takayuki MIZUNO ,  Yutaka MIYAMOTO

    IPC: H04J14/04 ,  H04B10/2581

    Abstract: An optical transmission system includes a plurality of transmission lines through which a mode-multiplexed signal obtained by multiplexing a plurality of optical signals of different types of modes is transmitted, and one or more mode group permutation units provided between the plurality of transmission lines. The mode group permutation unit changes, on a mode-group-by-mode-group basis, an optical signal of a mode belonging to a mode group to an optical signal of another mode belonging to a mode group after permutation corresponding to the mode group in such a manner that modes are interchanged between at least some of the plurality of optical signals multiplexed into the mode-multiplexed signal input from one of the plurality of transmission lines on an input side, and outputs the mode-multiplexed signal after mode interchange to one of the plurality of transmission lines on an output side.

    SIGNAL PROCESSING METHOD, SIGNAL PROCESSING APPARATUS AND COMMUNICATION SYSTEM
    16.
    发明申请
    SIGNAL PROCESSING METHOD, SIGNAL PROCESSING APPARATUS AND COMMUNICATION SYSTEM 有权

    公开(公告)号：US20220149974A1

    公开(公告)日：2022-05-12

    申请号：US17433149

    申请日：2020-01-31

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Takayuki KOBAYASHI ,  Masanori NAKAMURA ,  Fukutaro HAMAOKA ,  Yutaka MIYAMOTO

    IPC: H04J14/06 ,  H04B10/2507 ,  H04B10/61 ,  H04L27/01 ,  H04L27/38

    Abstract: A receiver convolutes each of a real component and an imaginary component of each polarization of a polarization-multiplexed reception signal with an impulse response for compensating for frequency characteristics of the receiver and a complex impulse response for wavelength dispersion compensation, and generates, as input signals, the convoluted real component and imaginary component of each polarization and phase conjugations thereof, for each polarization. The receiver generates, for each polarization, a first addition signal obtained by multiplying each of the real component and the imaginary component of each polarization by a complex impulse response, thereafter adding together the multiplied real component and imaginary component, and applying a phase rotation for frequency offset compensation to the added components, and a second addition signal obtained by multiplying each of the phase conjugation of the real component of and the phase conjugation of the imaginary component of each polarization by a complex impulse response, thereafter adding together the multiplied phase conjugations, and applying a phase rotation opposite to the phase rotation for frequency offset compensation to the added phase conjugations, and adds or subtracts a transmission data bias correction signal to or from a signal obtained by adding together the generated first addition signal and second addition signal.

    CHARACTERISTIC MEASUREMENT APPARATUS, CHARACTERISTIC MEASUREMENT METHOD AND COMPUTER PROGRAM
    20.
    发明申请
    CHARACTERISTIC MEASUREMENT APPARATUS, CHARACTERISTIC MEASUREMENT METHOD AND COMPUTER PROGRAM 有权

    公开(公告)号：US20250096919A1

    公开(公告)日：2025-03-20

    申请号：US18727823

    申请日：2022-09-28

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Akira KAWAI ,  Masanori NAKAMURA ,  Takayuki KOBAYASHI ,  Yutaka MIYAMOTO

    IPC: H04J14/02 ,  H04J14/06

    Abstract: A characteristic measurement device that measures a characteristic between lanes of a transmitter and a receiver connected via an optical fiber transmission path, the characteristic measurement device including an adaptive equalization unit that uses a polarization multiplexed reception signal and a phase conjugate signal of the polarization multiplexed reception signal or a plurality of signals mathematically equivalent to the reception signal and the phase conjugate signal of the reception signal as input signals and performs equalization processing on the input signals, and a characteristic function derivation unit that calculates a first inverse characteristic representing an inverse characteristic of the transmitter and a second inverse characteristic representing an inverse characteristic of the receiver on the basis of a filter coefficient obtained at the time of the equalization processing performed by the adaptive equalization unit and a frequency offset.

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