中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

14 records (took 0.011 seconds)

    OPTICAL MODULATION METHOD AND DEVICE USING NESTED OPTICAL MODULATOR
    1.
    发明申请
    OPTICAL MODULATION METHOD AND DEVICE USING NESTED OPTICAL MODULATOR 有权

    公开(公告)号：US20220182151A1

    公开(公告)日：2022-06-09

    申请号：US17437210

    申请日：2020-03-06

    Applicant: NEC Corporation

    Inventor： Ken-ichiro YOSHINO

    IPC: H04B10/556

    Abstract: An optical modulation method and device capable of stably generating an optical signal including a zero-intensity state among four states required for phase-time coding scheme by a nested modulator, is provided.
    A controller controls the phase difference generated by the phase shifter and an intensity and a magnitude of phase modulation provided by each of the first modulator and the second modulator to change an output lightwave of the nested modulator between four constellation points (S1-S4) on IQ plane. A first constellation point (S4) of the four constellation points has an intensity of 0, a second constellation point (S1) has a relative intensity of 1, each of a third constellation point (S2) and a fourth constellation point (S3) has a relative intensity ranging from 0 to 1, and the third and the fourth constellation points has a phase difference of 90 degrees.

    INFORMATION COMMUNICATION SYSTEM, INFORMATION COMMUNICATION METHOD AND DEVICE
    2.
    发明申请
    INFORMATION COMMUNICATION SYSTEM, INFORMATION COMMUNICATION METHOD AND DEVICE 审中-公开

    公开(公告)号：US20170237666A1

    公开(公告)日：2017-08-17

    申请号：US15502245

    申请日：2015-08-20

    Applicant: NEC Corporation

    Inventor： Takao OCHI ,  Ken-ichiro YOSHINO ,  Akio TAJIMA

    IPC: H04L12/803 ,  H04L9/12 ,  H04L9/08

    Abstract: In order to achieve the dispersion of a processing load between communication devices that perform information transmission, an information communication system according to an exemplary aspect of the present invention includes a first transmission system configured to transmit information in a direction from a first communication device to a second communication device; and a second transmission system configured to transmit information in a direction opposite to the direction of the first transmission system, wherein part of transmission information is received as received information in each of the first transmission system and the second transmission system.

    OPTICAL RECEIVING DEVICE IN OPTICAL COMMUNICATION SYSTEM, CONTROL METHOD AND DEVICE OF PHOTON DETECTOR, AND DARK COUNT EVALUATION METHOD OF PHOTON DETECTOR
    4.
    发明申请
    OPTICAL RECEIVING DEVICE IN OPTICAL COMMUNICATION SYSTEM, CONTROL METHOD AND DEVICE OF PHOTON DETECTOR, AND DARK COUNT EVALUATION METHOD OF PHOTON DETECTOR 有权
    光通信系统中的光接收设备，光电探测器的控制方法和设备以及光检测器的深刻评估方法

    公开(公告)号：US20150304106A1

    公开(公告)日：2015-10-22

    申请号：US14439043

    申请日：2013-10-29

    Applicant: NEC Corporation

    Inventor： Ken-ichiro YOSHINO

    IPC: H04L9/08 ,  H04B10/70

    CPC classification number: H04L9/0852 ,  H04B10/70

    Abstract: [Problem] It is to provide an optical receiving device, a control method and device of a photon detector, and a dark count evaluation method of the photon detector that make it possible to perform a dark count evaluation with the photon detector performing a receiving operation. [Solution] It is to include a Z pulse information detection unit 205 and a control unit 204 selectively extracting outputs of photon detectors PD1 and PD2 to a transmission light pulse with light intensity substantially equal to zero included in a transmission light pulse train and a dark count evaluation unit 206 evaluating dark counts of the photon detectors based on photon detection counts indicated by the extracted outputs.

    Abstract translation: [问题]提供光子检测器的光接收装置，控制方法和装置以及光子检测器的暗计数评估方法，使得可以用光子检测器执行接收操作来执行暗计数评估 。 [解决方案]包括Z脉冲信息检测单元205和控制单元204，其选择性地将光子检测器PD1和PD2的输出提取到包括在发送光脉冲串和黑暗中的基本上等于零的光强度的零的发光光脉冲 计数评估单元206基于由提取的输出指示的光子检测计数来评估光子检测器的暗计数。

    TERMINAL APPARATUS, MANAGEMENT APPARATUS, COMMUNICATION SYSTEM, COMMUNICATION METHOD, MANAGEMENT METHOD, AND NON-TRANSITORY COMPUTER READABLE MEDIUM
    5.
    发明公开
    TERMINAL APPARATUS, MANAGEMENT APPARATUS, COMMUNICATION SYSTEM, COMMUNICATION METHOD, MANAGEMENT METHOD, AND NON-TRANSITORY COMPUTER READABLE MEDIUM 审中-公开

    公开(公告)号：US20240313950A1

    公开(公告)日：2024-09-19

    申请号：US18569656

    申请日：2021-06-17

    Applicant: NEC Corporation ,  NEC Platforms, Ltd.

    Inventor： Ken TANAKA ,  Ken-ichiro YOSHINO ,  Tomoyasu IZUMIYA

    IPC: H04L9/08

    CPC classification number: H04L9/0819

    Abstract: A terminal apparatus, a management apparatus, a communication system, a communication method, a management method, and a non-transitory computer readable medium capable of reliably acquiring a cryptographic key for quantum cryptographic communication are provided. A terminal apparatus (10) includes an acquisition unit (11) that acquires a cryptographic key from a management apparatus by designating communication source identification information and communication destination identification information for the management apparatus, and requesting the cryptographic key from the management apparatus, the management apparatus managing a cryptographic key distributed by using a QKD technology, and a communication unit (12) that performs cryptographic communication with another terminal apparatus by using the cryptographic key acquired by the acquisition unit (11).

    DRIVE-TIMING ADJUSTMENT METHOD AND DEVICE FOR A PHOTON DETECTOR, AND OPTICAL COMMUNICATION SYSTEM
    6.
    发明申请
    DRIVE-TIMING ADJUSTMENT METHOD AND DEVICE FOR A PHOTON DETECTOR, AND OPTICAL COMMUNICATION SYSTEM 有权

    公开(公告)号：US20210021352A1

    公开(公告)日：2021-01-21

    申请号：US16978579

    申请日：2018-03-19

    Applicant: NEC Corporation

    Inventor： Ken-ichiro YOSHINO

    IPC: H04B10/70 ,  H04B10/556 ,  H04B10/61 ,  H04L7/00 ,  H04L9/08

    Abstract: [Problem] A method, a device, a system and a program that can adjust the drive timing of a photon detector with high speed and high reliability is provided. [Solution] A timing adjustment device for adjusting timing for driving a photon detector (202) of a receiver (200), includes: an asymmetric interferometer (201) that inputs an optical pulse sequence from a sender (100) and outputs an interference output optical pulse to the photon detector (202), wherein the optical pulse sequence includes two consecutive pulses, the sender subjecting the two consecutive pulses to phase-modulation according to send data fixed to a predetermined bit value, wherein the interference output optical pulse is generated by the two consecutive pulses interfering with each other depending on a phase difference, and wherein the interference output optical pulse is output to the photon detector corresponding to the phase difference; and a controller (204) configured to: record photon counts of photons detected by the photon detector while shifting gate application timing for the photon detector over a predetermined range; and set gate application timing for the photon detector with reference to a timing indicating a peak value of the photon counts.

    OPTICAL SENDER AND METHOD FOR DECIDING MODULATION TIMING CORRECTNESS
    9.
    发明公开
    OPTICAL SENDER AND METHOD FOR DECIDING MODULATION TIMING CORRECTNESS 审中-公开

    公开(公告)号：US20230254045A1

    公开(公告)日：2023-08-10

    申请号：US18009145

    申请日：2020-06-10

    Applicant: NEC Corporation

    Inventor： Ken-ichiro YOSHINO

    IPC: H04B10/524 ,  H04B10/54 ,  H04B17/20

    CPC classification number: H04B10/524 ,  H04B10/54 ,  H04B17/201

    Abstract: An optical sender is disclosed, which alone makes it possible to reliably decide whether modulation timing is correct or incorrect and to adjust the modulation timing. The optical sender includes: a first modulator that outputs a first optical pulse train subjected to intensity modulation; an asymmetric interferometer that outputs a second optical pulse train of double pulses; a second modulator (104) that outputs a third optical pulse train subjected to send-data modulation for each pulse pair; nd an optical intensity measuring device that measures an optical intensity of the third optical pulse train, a controller, when changing either of a first optical pulse train according to intensity modulation pattern and a second optical pulse train according to send-data modulation pattern, decides whether the modulation timing is correct or incorrect, based on optical intensity of the third optical pulse train.

    ENCRYPTION KEY GENERATION
    10.
    发明申请
    ENCRYPTION KEY GENERATION 有权

    公开(公告)号：US20240414088A1

    公开(公告)日：2024-12-12

    申请号：US18398295

    申请日：2023-12-28

    Applicant: NEC Corporation

    Inventor： Takao OCHI ,  Ken-ichiro YOSHINO ,  Akio TAJIMA

    IPC: H04L47/125 ,  H04L9/08 ,  H04L9/12 ,  H04L47/50

    Abstract: A first device transmits a first random number to a second device through a first quantum channel, and receives a second random number from the second device through a second quantum channel. The first device generates a first encryption key based on the first random number and the second random number. The second device transmits the second random number to the first device through the second quantum channel, and receives the first random number from the first device through the first quantum channel. The second device generates a second encryption key based on the first random number and the second random number.

Patent Agency Ranking