利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

27 条记录 (耗时 0.018 秒)

    COHERENT LIGHT-RECEIVING DEVICE
    1.
    发明公开
    COHERENT LIGHT-RECEIVING DEVICE 审中-公开

    公开(公告)号：EP3367594A1

    公开(公告)日：2018-08-29

    申请号：EP16857401.0

    申请日：2016-10-17

    申请人： Nippon Telegraph And Telephone Corporation ,  NTT Electronics Corporation

    发明人： HORIKOSHI Kengo ,  YOSHIDA Mitsuteru ,  OKAMOTO Seiji ,  HOSOYA Eiichi ,  YAMAZAKI Etsushi ,  ONUMA Yasuharu ,  TAKAMUKU Tomohiro ,  MIURA Naoki ,  YASUDA Sadayuki

    IPC分类号： H04B10/61 ,  H04L27/34

    摘要： A coherent optical reception device includes a local oscillation laser that supplies laser light, a coherent optical reception front-end unit that receives a multi-level modulated optical signal, demodulates the optical signal on the basis of the laser light, and converts a demodulated optical signal into an electrical analog signal, an analog-to-digital converter that converts the analog signal into a digital signal, a compensation unit that compensates for an influence of dispersion due to a wavelength or a polarized wave of the optical signal and recovers a carrier phase of the digital signal, a constellation distortion compensation unit that compensates for constellation distortion of the multi-level modulation included in the digital signal in which an influence of dispersion is compensated for by the compensation unit, and an error correction decoding unit that performs error correction of the digital signal in which the constellation distortion is compensated for.

    OPTICAL TRANSMISSION SYSTEM, PHASE COMPENSATION METHOD, AND OPTICAL RECEPTION DEVICE
    2.
    发明公开
    OPTICAL TRANSMISSION SYSTEM, PHASE COMPENSATION METHOD, AND OPTICAL RECEPTION DEVICE 有权
    OPTISCHESÜBERTRAGUNGSSYSTEM，PHASENKOMPENSATIONSVERFAHREN UND OPTISCHE EMPFANGSVORRICHTUNG

    公开(公告)号：EP2942917A1

    公开(公告)日：2015-11-11

    申请号：EP14752142.1

    申请日：2014-02-13

    申请人： Nippon Telegraph and Telephone Corporation

    发明人： YOSHIDA Mitsuteru ,  YAMAZAKI Etsushi ,  OKAMOTO Seiji ,  UZAWA Hiroyuki ,  HORIKOSHI Kengo ,  ISHIHARA Koichi ,  KOBAYASHI Takayuki ,  KISAKA Yoshiaki ,  TOMIZAWA Masahito ,  FUJIWARA Naoki ,  KATAOKA Tomoyoshi ,  YONENAGA Kazushige

    IPC分类号： H04L27/38 ,  H04B10/2507 ,  H04B10/61

    CPC分类号： H04B10/6165 ,  H04B10/2507 ,  H04B10/516 ,  H04B10/61 ,  H04J14/06 ,  H04L27/38 ,  H04L2027/0067 ,  H04L2027/0095

    摘要： An increase in circuit scale is suppressed and a phase variation caused in a transmission path or the like is compensated for. An optical transmission system includes: a pilot symbol detection unit which detects a plurality of pilot symbols intermittently inserted into a received complex electric field signal that is obtained through coherent detection for a received optical signal; an error signal computation unit which calculates a complex electric field error signal indicating a phase variation at each pilot symbol based on the pilot symbols detected by the pilot symbol detection unit and a predetermined reference symbol; a compensation electric field signal generation unit which estimates a phase variation between the pilot symbols in the received complex electric field signal using filter processing based on the complex electric field error signal calculated by the error signal computation unit; and a phase noise compensation unit which performs phase compensation for the received complex electric field signal based on the phase variation between the pilot symbols estimated by the compensation electric field signal generation unit.

    摘要翻译： 抑制电路规模的增加，并补偿在传输路径等中引起的相位变化。 光传输系统包括：导频符号检测单元，其检测间接插入到通过接收的光信号的相干检测获得的接收复电场信号中的多个导频符号; 误差信号计算单元，其基于由导频符号检测单元检测的导频符号和预定的参考符号来计算指示每个导频符号的相位变化的复电场误差信号; 补偿电场信号生成单元，其基于由所述误差信号计算单元计算出的复电场误差信号，使用滤波处理来估计所述接收复电场信号中的导频符号之间的相位变化; 以及相位噪声补偿单元，其基于由补偿电场信号生成单元估计的导频符号之间的相位变化，对接收到的复数电场信号进行相位补偿。

    TRANSMISSION METHOD, RECEPTION METHOD, TRANSMITTER APPARATUS, AND RECEIVER APPARATUS
    4.
    发明公开
    TRANSMISSION METHOD, RECEPTION METHOD, TRANSMITTER APPARATUS, AND RECEIVER APPARATUS 有权
    SENDEVERFAHREN，EMPFANGSVERFAHREN，SENDEVORRICHTUNG UND EMPFANGSVORRICHTUNG

    公开(公告)号：EP2521293A1

    公开(公告)日：2012-11-07

    申请号：EP11739836.2

    申请日：2011-02-03

    申请人： Nippon Telegraph And Telephone Corporation

    发明人： NAKAGAWA Tadao ,  YAMAZAKI Etsushi ,  ISHIHARA Koichi ,  KOBAYASHI Takayuki ,  KUDO Riichi ,  TAKATORI Yasushi ,  MATSUI Munehiro ,  MIYAMOTO Yutaka ,  SANO Akihide ,  YOSHIDA Eiji ,  MIZOGUCHI Masato

    IPC分类号： H04J11/00 ,  G02F2/00 ,  H04B10/02 ,  H04B10/04 ,  H04B10/06 ,  H04B10/142 ,  H04B10/152 ,  H04B10/18 ,  H04J14/00 ,  H04J14/04 ,  H04J14/06

    CPC分类号： H04B10/5053 ,  G02F1/0136 ,  H04B10/532 ,  H04B10/60 ,  H04J14/06

    摘要： A polarization state of a transmission signal can be changed at a high speed based on a symbol-rate By switching a first switch, a second switch, and a third switch with time, one of an X-polarized wave_I-signal as a Y-polarized wave_I-signal, a signal caused by performing logical inversion for an X-polarized wave_I-signal, an X-polarized wave_Q-signal and a signal caused by logical inversion for an X-polarized wave_Q-singal is input to a second modulator. Further, by switching the first switch, the second switch and the third switch with time, the second modulator is input one of the X-polarized wave_I-singal as the Y-polarized wave_Q-signal, the X-polarized wave_I-signal, the signal caused by performing logical inversion for the X-polarized wave_I-signal, the X-polarized wave_Q-signal and the signal caused by performing logical inversion for the X-polarized wave_Q-signal. Thereby, a polarization state of a transmission signal can be changed at high speed based on a symbol-rate speed.

    摘要翻译： 传输信号的偏振状态可以基于符号速率以高速度改变。通过随时间切换第一开关，第二开关和第三开关，X极化波I_信号之一作为Y轴， 通过对X偏振波I_信号进行逻辑反转而产生的信号，X偏振波Q信号以及由X偏振波Q_信号的逻辑反相引起的信号被输入到第二调制器。 此外，通过随时间切换第一开关，第二开关和第三开关，第二调制器输入X偏振波I-单位之一作为Y偏振波Q_信号，X偏振波I信号， 通过对X偏振波_I信号进行逻辑反转而产生的信号，X偏振波Q信号和由X偏振波Q_信号执行逻辑反相引起的信号。 由此，可以基于符号速度速度高速地改变发送信号的偏振状态。

    FREQUENCY OFFSET ESTIMATION APPARATUS, RECEIVER APPARATUS, FREQUENCY OFFSET ESTIMATION METHOD, AND RECEPTION METHOD
    9.
    发明公开
    FREQUENCY OFFSET ESTIMATION APPARATUS, RECEIVER APPARATUS, FREQUENCY OFFSET ESTIMATION METHOD, AND RECEPTION METHOD 有权
    用于测量频率偏移，接收装置中，法测量频率偏移和接收方法

    公开(公告)号：EP2584720A1

    公开(公告)日：2013-04-24

    申请号：EP11795834.8

    申请日：2011-06-17

    申请人： Nippon Telegraph And Telephone Corporation

    发明人： NAKAGAWA Tadao ,  MATSUI Munehiro ,  ISHIHARA Koichi ,  KUDO Riichi ,  KOBAYASHI Takayuki ,  YAMAZAKI Etsushi ,  SANO Akihide ,  YOSHIDA Eiji ,  MIZOGUCHI Masato ,  MIYAMOTO Yutaka ,  TAKATORI Yasushi

    IPC分类号： H04B17/00 ,  H04B10/04 ,  H04B10/06 ,  H04B10/142 ,  H04B10/152 ,  H04J11/00

    CPC分类号： H04L27/14 ,  H04B7/10 ,  H04B10/611 ,  H04B10/6164 ,  H04B17/327 ,  H04L27/2659 ,  H04L2027/0026 ,  H04L2027/0032 ,  H04L2027/0046

    摘要： Provided is a frequency offset estimation apparatus that appropriately estimates and compensates for a frequency offset of a received signal when estimating the frequency offset which is the difference between a carrier frequency of the received signal and the frequency of an output signal of a local oscillator. The frequency offset estimation apparatus converts the received signal sampled in advance with a predetermined sampling frequency into a frequency spectrum having N frequency components, limits a frequency band of negative frequency components from 1 to N /2 of the frequency spectrum and a frequency band of positive frequency components from N /2+1 to N of the frequency spectrum, calculates the sum of the squares of the positive frequency components of the frequency spectrum that have been subjected to frequency band limitation and the sum of the squares of the negative frequency components of the frequency spectrum that have been subjected to frequency band limitation to calculate power of the positive frequency components and power of the negative frequency components, and cyclically shifts all frequency components of the frequency spectrum in a frequency domain until the absolute value of a power difference between the power of the positive frequency components and the power of the negative frequency components is less than or equal to a predetermined threshold value, and estimates the frequency offset based on a shift amount until the absolute value is less than or equal to the threshold value.

    摘要翻译： 本发明提供一种频率偏移估计装置没有适当地估计和补偿的频率的接收信号的偏移在估计频率偏移的所有它是接收信号的载波频率和本机振荡器的输出信号的频率之间的差。 所述频率偏移估计装置预先与预定的采样频率到具有N个频率分量的频谱采样的接收的信号转换，从1至N / 2的频谱的和的正的频带限制负频率分量的频带 从N个频率分量/ 2 + 1到频谱的N，计算的频谱的正频率分量的平方的总和thathave进行了频率带限制和负频率分量的平方之和 频谱thathave进行了频率带宽限制来计算正频率分量的功率与负频率成分的功率，以及循环移位在频域中的频谱的所有频率成分，直到之间的功率差的绝对值 正频率分量的功率和的功率 负频率分量小于或等于预定的阈值，并估计频率偏移基于偏移量，直到绝对值小于或等于所述阈值。

    OPTICAL SIGNAL CONTROL DEVICE, OPTICAL SIGNAL CONTROL METHOD, AND OPTICAL SIGNAL TRANSMISSION SYSTEM
    10.
    发明公开
    OPTICAL SIGNAL CONTROL DEVICE, OPTICAL SIGNAL CONTROL METHOD, AND OPTICAL SIGNAL TRANSMISSION SYSTEM 审中-实审

    公开(公告)号：EP4351039A1

    公开(公告)日：2024-04-10

    申请号：EP21944098.9

    申请日：2021-06-02

    申请人： Nippon Telegraph And Telephone Corporation

    发明人： NAKAMURA Masanori ,  YOSHIDA Mitsuteru ,  YAMAZAKI Etsushi ,  KISAKA Yoshiaki

    IPC分类号： H04B10/516

    摘要： According to an aspect of the present invention, an optical signal control apparatus controls a compensation coefficient of an equalizer of an optical transmitter including the equalizer of a symbol period interval and a digital-to-analog converter (DAC) operating at a symbol period interval sampling rate and having a sampling phase adjustment function, and the sampling phase of the DAC. The optical signal control apparatus includes a skew calculation unit configured to calculate a sampling phase amount from a group delay difference between an in-phase component and a quadrature component based on characteristic information of a device and a transmission path and to output the calculated sampling phase amount to the DAC and a compensation coefficient calculation unit configured to calculate the compensation coefficient in which a phase characteristic of a Nyquist frequency of the DAC is 0 or an integer multiple of π and to output the calculated compensation coefficient to the equalizer.