公开(公告)号：US20150063819A1

公开(公告)日：2015-03-05

申请号：US14387021

申请日：2012-11-06

Applicant: NEC Corporation

Inventor： Hidemi Noguchi

IPC: H04B10/548 ,  H04B10/40

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：US12072243B2

公开(公告)日：2024-08-27

申请号：US17797843

申请日：2021-02-15

Applicant: NEC Corporation

Inventor： Keiichi Matsumoto ,  Hidemi Noguchi ,  Emmanuel Le Taillandier De Gabory

IPC: G01K11/3206 ,  G02B6/02

CPC classification number: G01K11/3206 ,  G02B6/02042

Abstract: Provided are a monitoring device, a monitoring method, and an optical transmission system which are adapted for an increase in the number of cores of a multi-core optical fiber transmission path and suitable for crosstalk monitoring. The monitoring device monitors a multi-core optical fiber transmission path having a plurality of use cores and at least one or more non-use cores, and comprises: an applying means for applying, at a start point of the multi-core optical fiber transmission path, dithering to signal light propagating in the use cores; a monitoring means for monitoring the power of the non-use cores at an input side of a relay in the multi-core optical fiber transmission path; and a separating means for separating a monitoring result from the monitoring means into power components from the plurality of use cores.

公开(公告)号：US20240214073A1

公开(公告)日：2024-06-27

申请号：US18533398

申请日：2023-12-08

Applicant: NEC Corporation

Inventor： Shoma TATENO ,  Hidemi Noguchi

IPC: H04B10/29

CPC classification number: H04B10/29

Abstract: An optical network system includes an optical repeater and a control device controlling the optical repeater. The control device: manages wavelength information of optical signals transmitted and received by the optical repeater in a path of the optical network and transmission line information of optical transmission lines connected to the optical repeater; determines a chromatic dispersion compensation amount for compensation in the optical repeater based on the wavelength information and the transmission line information; and determines phase conjugation processing in the optical repeater based on the wavelength information and the transmission line information. The optical repeater: acquires the chromatic dispersion compensation amount and phase conjugation processing information from the control device; performs chromatic dispersion compensation processing on an electrical signal based on the chromatic dispersion compensation amount; and performs phase conjugation processing on an electrical signal based on the phase conjugation processing information.

公开(公告)号：US20240069201A1

公开(公告)日：2024-02-29

申请号：US18231013

申请日：2023-08-07

Applicant: NEC Corporation

Inventor： Hidemi Noguchi ,  Junichi Abe

IPC: G01S17/89 ,  G06T7/33 ,  G06T19/20

CPC classification number: G01S17/89 ,  G06T7/344 ,  G06T19/20 ,  G06T2207/10028 ,  G06T2219/2021

Abstract: A foreign body detection system includes a first point cloud acquisition unit and a second point cloud acquisition unit as a point cloud acquisition means, an alignment unit, and a foreign body detection unit. The point cloud acquisition means acquires a point cloud by controlling a first fixed-point three-dimensional LiDAR scanner in such a way that the first fixed-point three-dimensional LiDAR scanner performs scanning in a scanning range including a monitoring target in a scanning range and generates a point cloud. The alignment unit aligns the point cloud and known three-dimensional shape data about the monitoring target with each other. The foreign body detection unit detects a foreign body in contact with the monitoring target, based on the point cloud and the aligned three-dimensional shape data.

公开(公告)号：US11719817B2

公开(公告)日：2023-08-08

申请号：US16772346

申请日：2017-12-15

Applicant: NEC CORPORATION

Inventor： Hidemi Noguchi ,  Junichi Abe

IPC: G01S17/32 ,  G01S17/18 ,  G01C3/08

CPC classification number: G01S17/32 ,  G01S17/18 ,  G01C3/08

Abstract: A distance-measuring apparatus (2000) generates transmission light by generating a distance measurement signal, and subjecting an optical carrier wave to quadrature modulation on the basis of the generated distance measurement signal. The distance-measuring apparatus (2001) outputs transmission light, and receives reflected light generated by reflecting the transmission light on an object (10) to be measured. The distance-measuring apparatus (2000) compares the received reflected light with reference light to compute a distance from the distance-measuring apparatus (2000) to the object (10) to be measured.

公开(公告)号：US09690751B2

公开(公告)日：2017-06-27

申请号：US14914763

申请日：2014-08-20

Applicant: NEC Corporation

Inventor： Hidemi Noguchi

IPC: G06F17/14 ,  H03H17/02 ,  H04L25/03

CPC classification number: G06F17/14 ,  H03H17/0213 ,  H03H17/0226 ,  H03H17/0227 ,  H04B3/06 ,  H04L25/03057

Abstract: In order to enhance the speed of a processing necessary for setting the factor of a filter and further maintain the accuracy of the filter, a digital processing apparatus includes: a Fourier transform unit that Fourier transforms a time domain digital signal, thereby generating N frequency domain signals; a filter unit that uses N first factors to process the frequency domain signals in the frequency domain; an inverse Fourier transform unit that transforms the frequency domain signals as processed by the filer unit to a time domain digital signal; a low accuracy factor calculation unit that uses m second factors to calculate N first A factors; a high accuracy factor calculation unit that includes a factor division unit for calculating respective ratios of N third factors to the N first A factors and that also includes a factor variable unit for calculating N first B factors varying stepwise from one to the respective ratios; a multiplication unit that multiplies the first A factors by the first B factors, thereby calculating the N first factors; and a control unit that controls the low accuracy factor calculation unit and high accuracy factor calculation unit by causing only the low accuracy factor calculation unit to operate with the first B factors being set to one and thereafter causing the high accuracy factor calculation unit to calculate the first B factors based on the third factors.

公开(公告)号：US12228647B2

公开(公告)日：2025-02-18

申请号：US17284002

申请日：2018-10-17

Applicant: NEC Corporation

Inventor： Hidemi Noguchi

IPC: G01C3/08 ,  G01S7/484 ,  G01S7/4861 ,  G01S17/26

Abstract: A generation unit (2) generates a plurality of transmission pulses of which the strength of an optical signal changes in a pulse-like manner. Note that the generation part (2) generates a plurality of transmission pulses having frequency offsets different from each other. The transmission unit (4) repeatedly transmits transmission pulses generated by the generation unit (2). The reception part (6) receives reflected pulses of the respective transmission pulses reflected on a distance-measurement-target object. The detection unit (8) detects the frequency offsets of the reflected pulses received by the reception unit (6). The distance calculation unit (10) calculates a distance to the distance-measurement-target object based on the receiving timings of the reflected pulses received by the reception unit (6) and the transmitting timings of the transmission pulses corresponding to the frequency offsets detected from the reflected pulses.

公开(公告)号：US20240371130A1

公开(公告)日：2024-11-07

申请号：US18645803

申请日：2024-04-25

Applicant: NEC Corporation

Inventor： Tatsuya FUJIMOTO ,  Hidemi Noguchi ,  Junichi Abe

IPC: G06V10/762 ,  G01S17/89

Abstract: An information processing apparatus of the present disclosure includes: a classifying unit that classifies three-dimensional point cloud data including distance values to a target in a specified region into one or more clusters based on the distance values; and a determining unit that determines the cluster to adopt based on the distribution of the distance values of the three-dimensional point cloud data included by the cluster obtained by the classification.

公开(公告)号：US20240069202A1

公开(公告)日：2024-02-29

申请号：US18231342

申请日：2023-08-08

Applicant: NEC Corporation

Inventor： Hidemi Noguchi ,  Junichi Abe

IPC: G01S17/89 ,  G01S7/48 ,  G01S17/933

CPC classification number: G01S17/89 ,  G01S7/4802 ,  G01S17/933

Abstract: A first point cloud acquisition unit controls a first fixed-point three-dimensional LiDAR scanner in such a way that the first fixed-point three-dimensional LiDAR scanner performs scanning in a low-density scanning range including a monitoring target in a scanning range and generates a low-density point cloud. An alignment unit aligns the low-density point cloud and known three-dimensional shape data about the monitoring target with each other. A scanning range determination unit determines a high-density scanning range including the monitoring target in a scanning range and also being narrower than the low-density scanning range, based on a result of the alignment by the alignment unit. A second point cloud acquisition unit controls the first fixed-point three-dimensional LiDAR scanner in such a way that the first fixed-point three-dimensional LiDAR scanner performs scanning in the high-density scanning range and generates a high-density point cloud.

公开(公告)号：US11754713B2

公开(公告)日：2023-09-12

申请号：US16762492

申请日：2018-12-05

Applicant: NEC Corporation

Inventor： Hidemi Noguchi ,  Junichi Abe

IPC: G01S17/36 ,  G01S7/487 ,  G01S17/10 ,  G01S17/87 ,  G01S17/32

CPC classification number: G01S17/36 ,  G01S7/487 ,  G01S17/10 ,  G01S17/32 ,  G01S17/87

Abstract: A range finding apparatus (2000) generates a plurality of range finding signals. The range finding apparatus (2000) generates transmission light acquired by performing at least one of quadrature modulation and polarization modulation on an optical carrier wave by using each of the generated range finding signals. The range finding apparatus (2000) transmits the generated transmission light. The range finding apparatus (2000) receives reflection light which is the transmission light reflected by an object to be measured. The range finding apparatus (2000) extracts a reception signal corresponding to each of the range finding signals by demodulating the reflection light. The range finding apparatus (2000) computes a distance to the object to be measured by using any one or more of the extracted reception signals.