中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

22 records (took 0.02 seconds)

    GAIN ADJUSTMENT METHOD, OPTICAL RECEIVING APPARATUS AND COMPUTER PROGRAM
    1.
    发明申请
    GAIN ADJUSTMENT METHOD, OPTICAL RECEIVING APPARATUS AND COMPUTER PROGRAM 有权

    公开(公告)号：US20250055573A1

    公开(公告)日：2025-02-13

    申请号：US18717521

    申请日：2021-12-24

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Kyo MINOGUCHI ,  Etsushi YAMAZAKI ,  Yoshiaki KISAKA ,  Kengo HORIKOSHI ,  Seiji OKAMOTO ,  Masanori NAKAMURA

    IPC: H04B10/61 ,  H04B10/294

    Abstract: A gain adjustment method in an optical transmission system that performs communication by a digital coherent system including an optical transmission device and an optical reception device includes converting an optical signal transmitted from the optical transmission device into an electrical signal, converting the electrical signal from an analog signal to a digital signal, performing first signal processing on the digital signal, performing adaptive equalization processing on the digital signal subjected to the first signal processing using a digital filter, correcting an amplitude of an output signal of the digital filter based on information of the amplitude and a phase of the output signal of the digital filter and the amplitude of a known transmission signal, and performing second signal processing on the output signal of the digital filter whose amplitude has been corrected.

    OPTICAL RECEIVER, OPTICAL RECEPTION METHOD, AND OPTICAL COMMUNICATION SYSTEM
    2.
    发明申请
    OPTICAL RECEIVER, OPTICAL RECEPTION METHOD, AND OPTICAL COMMUNICATION SYSTEM 审中-公开

    公开(公告)号：US20200052793A1

    公开(公告)日：2020-02-13

    申请号：US16342909

    申请日：2017-10-25

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Fukutaro HAMAOKA ,  Seiji OKAMOTO ,  Masanori NAKAMURA ,  Kengo HORIKOSHI ,  Yoshiaki KISAKA

    IPC: H04B10/61 ,  H04B3/06 ,  H04L27/01

    Abstract: An optical receiver that demodulates an optical modulation signal into a baseband signal, which is an electrical signal, and decodes a received symbol acquired by converting the baseband signal. The optical receiver includes: an analog-to-digital converter that converts the baseband signal into a digital signal of which the number of samples per received symbol is M/N (samples/symbol), M and N being positive integers, M/N being not an integer, and “M >N” being satisfied; and an adaptive equalization processing unit that executes an equalization operation set in advance to output the received symbol on the basis of the digital signal of which the number of samples per received symbol is M/N (samples/symbol) and a predetermined tap coefficient digital signal equalization tap coefficients used for equalization of a signal, the coefficient being updated in any sampling period.

    COHERENT COMMUNICATION SYSTEM, COMMUNICATION METHOD, AND TRANSMISSION METHOD
    3.
    发明申请
    COHERENT COMMUNICATION SYSTEM, COMMUNICATION METHOD, AND TRANSMISSION METHOD 有权
    相干通信系统，通信方法和传输方法

    公开(公告)号：US20150341138A1

    公开(公告)日：2015-11-26

    申请号：US14759329

    申请日：2014-01-15

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Koichi ISHIHARA ,  Masato MIZOGUCHI ,  Tomoki MURAKAMI ,  Tomoyoshi KATAOKA ,  Yoshiaki KISAKA ,  Tadao NAKAGAWA ,  Etsushi YAMAZAKI ,  Seiji OKAMOTO ,  Kengo HORIKOSHI ,  Masahito TOMIZAWA ,  Riichi KUDO

    IPC: H04J14/08 ,  H04J3/14 ,  H04B10/61 ,  H04B10/077

    CPC classification number: H04J14/08 ,  H04B10/0775 ,  H04B10/2513 ,  H04B10/25133 ,  H04B10/516 ,  H04B10/61 ,  H04B10/6161 ,  H04B10/697 ,  H04B2210/072 ,  H04J3/14

    Abstract: The estimation of an amount of chromatic dispersion using a training signal sequence is possible. A transmission method includes: a training signal sequence generation step of generating, as training signal sequences, a plurality of signal sequences having power concentrated in a plurality of frequency bands, the power concentrated at different frequency bands; a training signal sequence selection step of selecting at least one training signal sequence from among the plurality of training signal sequences generated in the training signal sequence generation step, a signal multiplexing step of generating a signal sequence obtained by time-division multiplexing the training signal sequence selected in the training signal sequence selection step with a transmission data sequence, and an electrical-to-optical conversion step of transmitting the signal sequence generated in the signal multiplexing step as an optical signal.

    Abstract translation: 使用训练信号序列的色散量的估计是可能的。 发送方法包括：训练信号序列生成步骤，将集中在多个频带的功率的多个信号序列作为训练信号序列生成，集中在不同频带的功率; 训练信号序列选择步骤，从在所述训练信号序列生成步骤中生成的所述多个训练信号序列中选择至少一个训练信号序列，生成通过对所述训练信号序列进行时分复用而获得的信号序列的信号复用步骤 在发送数据序列的训练信号序列选择步骤中选择的电 - 光转换步骤，将在信号复用步骤中生成的信号序列作为光信号进行发送。

    OPTICAL RECEIVING DEVICE AND PHASE CYCLE REDUCTION METHOD
    4.
    发明申请
    OPTICAL RECEIVING DEVICE AND PHASE CYCLE REDUCTION METHOD 有权
    光接收装置和相循环减少方法

    公开(公告)号：US20150333838A1

    公开(公告)日：2015-11-19

    申请号：US14758941

    申请日：2014-01-24

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Kengo HORIKOSHI ,  Kohki SHIBAHARA ,  Etsushi YAMAZAKI ,  Mitsuteru YOSHIDA ,  Koichi ISHIHARA ,  Takayuki KOBAYASHI ,  Yoshiaki KISAKA ,  Takuya OHARA ,  Masahito TOMIZAWA ,  Tomoyoshi KATAOKA

    IPC: H04B10/61 ,  H04L27/38 ,  H04L7/00 ,  H04L27/06

    CPC classification number: H04B10/6165 ,  H04L7/0041 ,  H04L7/0075 ,  H04L27/066 ,  H04L27/389

    Abstract: An optical receiving device receives an optical signal that has been modulated by means of phase modulation or quadrature amplitude modulation, converts the received optical signal into an electrical signal using coherent detection, and performs phase compensation on the converted received signal, and includes: a carrier phase estimation unit that estimates carrier phase errors in a received symbol string obtained from the received signal; a gain adjustment unit that performs gain adjustment on symbols input into the carrier phase adjustment unit; a phase cycle slip reduction unit that, by performing statistical processing on an output from the carrier phase estimation unit, detects general noise that causes a phase cycle slip, and reduces the phase cycle slip; and a phase compensation circuit that compensates carrier phase errors contained in the received signal using an output from the carrier phase estimation unit.

    Abstract translation: 光接收装置接收通过相位调制或正交幅度调制进行了调制的光信号，使用相干检测将接收的光信号转换为电信号，并对转换的接收信号进行相位补偿，并包括：载波 估计从接收信号获得的接收符号串中的载波相位误差的相位估计单元; 增益调整单元，对输入到所述载波相位调整单元的符号进行增益调整; 通过对来自载波相位估计单元的输出进行统计处理，检测导致相位滑动的一般噪声并减少相位滑动的相位滑移减小单元; 以及相位补偿电路，其使用来自载波相位估计单元的输出来补偿接收信号中包含的载波相位误差。

    OPTICAL TRANSMISSION SYSTEM AND COMPENSATION METHOD
    5.
    发明申请
    OPTICAL TRANSMISSION SYSTEM AND COMPENSATION METHOD 有权

    公开(公告)号：US20220216923A1

    公开(公告)日：2022-07-07

    申请号：US17595161

    申请日：2019-05-23

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Asuka MATSUSHITA ,  Masanori NAKAMURA ,  Kengo HORIKOSHI ,  Shoichiro KUWAHARA ,  Yoshiaki KISAKA

    IPC: H04B10/61

    Abstract: An optical transmission system according to an embodiment includes: an optical transmission unit which modulates an optical signal into which a known signal is inserted and transmits the optical signal; and an optical reception unit which receives the optical signal from the optical transmission unit, wherein the optical reception unit includes: an optical receiver which performs coherent detection of a reception signal of the optical signal received from the optical transmission unit; a receiver transfer function estimation section which estimates a nonlinear response transfer function of the optical receiver based on the known signal included in the reception signal after the detection by the optical receiver; and a receiver compensation section which compensates nonlinear distortion of the reception signal after the detection based on the nonlinear response transfer function which the receiver transfer function estimation section estimates.

    FIBER MODULE
    6.
    发明申请
    FIBER MODULE 有权

    公开(公告)号：US20210041631A1

    公开(公告)日：2021-02-11

    申请号：US16979626

    申请日：2019-02-28

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Kengo HORIKOSHI ,  Takashi YAMADA ,  Hisao YOSHINAGA ,  Shunsuke KANAI ,  Manabu KUBOTA

    IPC: G02B6/255

    Abstract: A fiber module (1B) according to the present disclosure includes an input-side optical fiber (11), an output-side optical fiber (12), a ferrule (20) in which the input-side optical fiber and the output-side optical fiber are insertable in both ends and a groove (32) is formed in a direction orthogonal to a longitudinal direction (D1) in the middle of the longitudinal direction, a dielectric multilayer film filter (30) inserted in the groove, and an input-side GI fiber (15) and an output-side GI fiber (16) joined by fusion to respective terminal portions of the input-side optical fiber and the output-side optical fiber. The dielectric multilayer film filter is interposed between an end surface (15f) of the input-side GI fiber and an end surface (16f) of the output-side GI fiber in the longitudinal direction.

    ADAPTIVE EQUALIZATION FILTER AND METHOD FOR UPDATING FILTER COEFFICIENTS
    9.
    发明公开
    ADAPTIVE EQUALIZATION FILTER AND METHOD FOR UPDATING FILTER COEFFICIENTS 审中-公开

    公开(公告)号：US20230421420A1

    公开(公告)日：2023-12-28

    申请号：US18038194

    申请日：2020-11-25

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Etsushi YAMAZAKI ,  Seiji OKAMOTO ,  Masanori NAKAMURA ,  Kengo HORIKOSHI ,  Takeo SASAI ,  Yoshiaki KISAKA

    IPC: H04L27/01 ,  H04L25/03

    CPC classification number: H04L27/01 ,  H04L25/03057

    Abstract: An aspect of the present invention is an adaptive equalization filter for an optical transmission system, including: a main signal filter; and a coefficient computation unit that updates the filter coefficient of the main signal filter. The pre-stage filter and the post-stage filter receive a sample of the main signal as an input. The pre-stage coefficient computation unit obtains the filter coefficient of the pre-stage filter by feedback control using the gradient method. The post-stage coefficient computation unit obtains the filter coefficient of the post-stage filter by feedforward control. The convolution computation unit obtains the filter coefficient of the main signal filter by convolution computation of the filter coefficient of the pre-stage filter obtained by the pre-stage coefficient computation unit and the filter coefficient of the post-stage filter obtained by the post-stage coefficient computation unit.

Patent Agency Ranking