公开(公告)号：US10205528B2

公开(公告)日：2019-02-12

申请号：US15558799

申请日：2015-03-20

Applicant: NEC Corporation

Inventor： Emmanuel Le Taillandier De Gabory ,  Hidemi Noguchi

IPC: H04B10/04 ,  H04B10/516 ,  H04B10/588

Abstract: It is impossible to compensate non-linearity in an optical transmitter during operations, therefore, an optical transmitter according to an exemplary aspect of the invention includes a selective addition means for adding a coefficient to digital data to be transmitted if the digital data being included in one of data intervals of predetermined number, the predetermined number being integer more than one, and for changing the coefficient with a period longer than the symbol period of the data transmitted by the optical transmitter; a data processing means for processing the digital data by using a parameter; a driving signal means for generating a driving signal from the digital data adjusted by the selective addition means and the data processing means; a modulating means for modulating light into lightwave signal by the driving signal; and a control means for receiving a monitor signal obtained by monitoring the lightwave signal having a frequency component determined by the period of changing the added coefficients, and for modifying the parameter of the data processing means in order for the monitor signal to reach an extremum.

公开(公告)号：US09413467B2

公开(公告)日：2016-08-09

申请号：US14387005

申请日：2012-11-06

Applicant: NEC Corporation

Inventor： Hidemi Noguchi

IPC: H04B10/50 ,  H04B10/556 ,  G02F1/01 ,  G02F1/225 ,  H04B10/27

CPC classification number: H04B10/5561 ,  G02F1/0121 ,  G02F1/2255 ,  H04B10/27

Abstract: An optical modulator includes optical waveguides on which phase modulation regions are formed. A drive circuit includes a lower-bit drive unit, an upper-bit drive unit, and a bit splitting unit. The bit splitting unit splits an input digital signal into upper bits and lower bits. The lower-bit drive unit outputs a value obtained by performing D/A conversion on the lower bits to phase modulation regions. The upper-bit drive unit outputs, to phase modulation regions, a value greater than a maximum value of values output from the lower-bit drive unit, or a minimum value of the values output from the lower-bit drive unit, according to a value of the upper bits.

Abstract translation: 光调制器包括其上形成有相位调制区域的光波导。 驱动电路包括下位驱动单元，高位驱动单元和分位单元。 分位单元将输入数字信号分为高位和低位。 低位驱动单元通过对低位到相位调制区域进行D / A转换而得到的值。 高位驱动单元向相位调制区域输出大于从低位驱动单元输出的值的最大值或从低位驱动单元输出的值的最小值的值，根据 高位数值。

公开(公告)号：US09319145B2

公开(公告)日：2016-04-19

申请号：US14387021

申请日：2012-11-06

Applicant: NEC Corporation

Inventor： Hidemi Noguchi

IPC: H04B10/556 ,  H04B10/548 ,  H04B10/40 ,  G02F1/01 ,  G02F1/21

CPC classification number: H04B10/548 ,  G02F1/0121 ,  G02F2001/212 ,  G02F2201/16 ,  H04B10/40

Abstract: The present invention provides an optical transmitter, an optical transmission/reception system, and a drive circuit, which are capable of adjusting linearity of signal intensity of output light. The optical transmitter includes an optical transmission lines through which an optical signal propagates, phase modulation regions being formed on the optical transmission line. A decoder decodes an input digital signal and outputs signals according to a decoded value. A drive circuit outputs drive signals level of which is equal to or more than three to the each of the plurality of phase modulation regions based on the signals. A control circuit adjusts full-scale amplitude of each of the drive signals by controlling the drive circuit.

Abstract translation: 本发明提供能够调节输出光的信号强度的线性度的光发送器，光发送/接收系统和驱动电路。 光发射机包括光传输线，光信号传播的光传输线，形成在光传输线上的相位调制区。 解码器解码输入数字信号并根据解码值输出信号。 基于该信号，驱动电路向多个相位调制区域中的每一个输出等于或大于三的驱动信号电平。 控制电路通过控制驱动电路来调整每个驱动信号的满量程幅度。

公开(公告)号：US20150110500A1

公开(公告)日：2015-04-23

申请号：US14394313

申请日：2013-04-03

Applicant: NEC CORPORATION

Inventor： Hidemi Noguchi

IPC: G02F1/225 ,  H04B10/25 ,  H04B10/54 ,  G02F1/01

CPC classification number: G02F1/225 ,  G02F1/0121 ,  G02F1/0316 ,  G02F2001/212 ,  G02F2201/126 ,  G02F2201/16 ,  H04B10/25 ,  H04B10/541

Abstract: A Mach-Zehnder type optical modulator according to the present invention is characterized by: that it comprises a beam splitting unit for splitting input light into two component light beams, a first waveguide and a second waveguide for guiding respective ones of the split component light beams, a beam combining unit for combining together the component light beams guided respectively by the first and second waveguides and outputting the combined light, a plurality of electrodes which are formed into electrode pairs as a result of being arranged on the first and second waveguides in a symmetric and parallel manner, and driving units for differentially driving respective ones of the electrode pairs in accordance with the magnitude relationships between the voltage of an input signal and respective ones of threshold voltages set individually for the electrode pairs; and that, by thus being driven differentially, the plurality of electrodes each apply a voltage for modulating the input light to the waveguide on which they are arranged.

Abstract translation: 根据本发明的马赫 - 曾德尔型光调制器的特征在于：它包括用于将输入光分成两个分量光束的分束单元，第一波导和第二波导，用于引导分离成分光束 ，光束组合单元，用于将由第一和第二波导分别引导并分别组合的组分光束组合在一起;多个电极，其形成为电极对，作为布置在第一和第二波导中的结果 以及用于根据输入信号的电压和针对电极对单独设定的各个阈值电压之间的大小关系差分地驱动相应电极对的驱动单元; 并且通过这样驱动差分地，多个电极各自施加用于将输入光调制到其上布置的波导的电压。

公开(公告)号：US12170544B2

公开(公告)日：2024-12-17

申请号：US17766314

申请日：2020-10-05

Applicant: NEC Corporation

Inventor： Masaki Sato ,  Hidemi Noguchi ,  Junichi Abe

IPC: H04B10/61 ,  H04B3/06

Abstract: An optical signal processing circuit (1) includes: an FDE-MIMO equalizer (2) configured to generate, based on continuous subcarrier signals including a target subcarrier signal in an optical multicarrier signal to be received, the continuous subcarrier signals that have been subjected to frequency-domain MIMO equalization processing; and a TDE-MIMO equalizer (3) configured to generate, based on the continuous subcarrier signals that have been subjected to the frequency-domain MIMO equalization processing, the target subcarrier signal that has been subjected to time-domain MIMO equalization processing.

公开(公告)号：US12154258B2

公开(公告)日：2024-11-26

申请号：US17599757

申请日：2020-03-17

Applicant: NEC Corporation

Inventor： Yoshimasa Ono ,  Akira Tsuji ,  Hidemi Noguchi ,  Junichi Abe

IPC: G06T7/00 ,  G01B11/30 ,  G01C3/06 ,  G01N21/956 ,  G01S17/06 ,  G01S17/89 ,  G06T7/70 ,  G06V10/764

Abstract: There is provided a surface abnormality detection device, and a system, capable of detecting an abnormal portion having a displacement below the distance measurement accuracy when detecting the abnormal portion on the surface of a structure. A surface abnormality detection device includes a classification means for classifying an object under measurement into one or more clusters having the same structure, based on position information at a plurality of points on a surface of the object under measurement; a determination means for determining a reflection brightness normal value of the cluster based on a distribution of reflection brightness values at a plurality of points on a surface of the cluster; and an identification means for identifying an abnormal portion on the surface of the cluster based on a difference between the reflection brightness normal value and the reflection brightness value at each of the plurality of points.

公开(公告)号：US12095502B2

公开(公告)日：2024-09-17

申请号：US17642385

申请日：2019-09-20

Applicant: NEC Corporation

Inventor： Yohei Hasegawa ,  Hidemi Noguchi ,  Shigeyuki Yanagimachi

IPC: H04B10/07 ,  H04B10/079

CPC classification number: H04B10/07953

Abstract: Provided is a communication device that can deliver an improvement in the communication capacity of communication infrastructure with the quality of communication taken into consideration. A communication device includes an acquiring unit configured to acquire quality information of a communication line extending from a first communication device to a second communication device and including an optical communication line, an estimating unit configured to estimate the quality of communication of the second communication device and determine the required quality of communication of the second communication device based on the quality information, and a controlling unit configured to perform control on communication channels in the optical communication line so that the quality of communication satisfies the required quality of communication.

公开(公告)号：US20230400557A1

公开(公告)日：2023-12-14

申请号：US18030444

申请日：2020-10-14

Applicant: NEC Corporation

Inventor： Hidemi Noguchi

IPC: G01S7/484 ,  G01S17/10

CPC classification number: G01S7/484 ,  G01S17/10

Abstract: An optical distance measurement device (10) includes a light transmission unit (11) that transmits distance measurement light to a measurement object, a light reception unit (12) that receives reflected light being reflected from the measurement object by the transmitted distance measurement light, a modulation unit (13) that generates reference light acquired by performing intensity modulation on a light source according to a distance measurement range, a detection unit (14) that generates a reception signal by causing the received reflected light and the generated reference light to interfere with each other, and a distance calculation unit (15) that calculates a distance to the measurement object, based on the transmitted distance measurement light and the generated reception signal.

公开(公告)号：US09459511B2

公开(公告)日：2016-10-04

申请号：US14394313

申请日：2013-04-03

Applicant: NEC Corporation

Inventor： Hidemi Noguchi

IPC: H04B10/25 ,  H04B10/54 ,  G02F1/01 ,  G02F1/225 ,  G02F1/03 ,  G02F1/21

CPC classification number: G02F1/225 ,  G02F1/0121 ,  G02F1/0316 ,  G02F2001/212 ,  G02F2201/126 ,  G02F2201/16 ,  H04B10/25 ,  H04B10/541

Abstract: A Mach-Zehnder type optical modulator according to the present invention is characterized by: that it comprises a beam splitting unit for splitting input light into two component light beams, a first waveguide and a second waveguide for guiding respective ones of the split component light beams, a beam combining unit for combining together the component light beams guided respectively by the first and second waveguides and outputting the combined light, a plurality of electrodes which are formed into electrode pairs as a result of being arranged on the first and second waveguides in a symmetric and parallel manner, and driving units for differentially driving respective ones of the electrode pairs in accordance with the magnitude relationships between the voltage of an input signal and respective ones of threshold voltages set individually for the electrode pairs; and that, by thus being driven differentially, the plurality of electrodes each apply a voltage for modulating the input light to the waveguide on which they are arranged.

Abstract translation: 根据本发明的马赫 - 曾德尔型光调制器的特征在于：它包括用于将输入光分成两个分量光束的分束单元，第一波导和第二波导，用于引导分离成分光束 ，光束组合单元，用于将由第一和第二波导分别引导并分别组合的组分光束组合在一起;多个电极，其形成为电极对，作为布置在第一和第二波导中的结果 以及用于根据输入信号的电压和针对电极对单独设定的各个阈值电压之间的大小关系差分地驱动相应电极对的驱动单元; 并且通过这样驱动差分地，多个电极各自施加用于将输入光调制到其上布置的波导的电压。

公开(公告)号：US09425898B2

公开(公告)日：2016-08-23

申请号：US14433713

申请日：2013-07-31

Applicant: NEC Corporation

Inventor： Hidemi Noguchi

IPC: H04B10/04 ,  H04B10/548 ,  H04B10/50 ,  H04B10/556 ,  H04B10/516 ,  G02F1/01

CPC classification number: H04B10/548 ,  G02F1/0121 ,  H04B10/5051 ,  H04B10/508 ,  H04B10/516 ,  H04B10/5561

Abstract: The optical transmission system includes signal output means (11S) for outputting a drive signal according to an input signal to the first optical modulator (11a), first waveform shaping signal output means (12S) for outputting a first waveform shaping signal to the second optical modulator (10A), and second waveform shaping signal output means (13S) for outputting a second waveform shaping signal to the third optical modulator (13a). The first waveform shaping signal is output to the second optical modulator (10A) at a timing relatively later than a timing of an output of a signal by the first optical modulator (11a). The second waveform shaping signal is output to the third optical modulator (13a) at a timing relatively earlier than the timing of the output of the signal by the first optical modulator (11a).

Abstract translation: 光传输系统包括用于根据输入信号向第一光调制器（11a）输出驱动信号的信号输出装置（11S），第一波形整形信号输出装置（12S），用于将第一波形整形信号输出到第二光 调制器（10A）和用于向第三光调制器（13a）输出第二波形整形信号的第二波形整形信号输出装置（13S）。 第一波形整形信号在比由第一光调制器（11a）输出信号的定时更晚的定时输出到第二光调制器（10A）。 第二波形整形信号在比由第一光调制器（11a）输出信号的定时更早的时间被输出到第三光调制器（13a）。