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公开(公告)号：US11817902B2
公开(公告)日：2023-11-14
申请号：US17836350
申请日：2022-06-09
发明人： Yuta Takemoto , Toshiyuki Ando
IPC分类号： H04B10/00 , H04B10/118
CPC分类号： H04B10/118
摘要： An orientation direction control device includes: an orientation direction control information acquisition unit to acquire orientation direction control information for controlling an orientation direction in which a first optical communication terminal as a first transmission/reception device transmits and receives light; and a capture and tracking control unit as an orientation direction control unit to control an orientation direction in which a second optical communication terminal as a second transmission/reception device transmits and receives the light or a radio wave on the basis of the orientation direction control information acquired by the orientation direction control information acquisition unit.
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公开(公告)号：US11038590B2
公开(公告)日：2021-06-15
申请号：US17119467
申请日：2020-12-11
IPC分类号： H04B10/00 , H04B10/2507 , H04B10/2575
摘要： An optical transmission device includes: a controlled oscillator for outputting a calibration signal having an output frequency that corresponds to an input oscillation control signal; an electrical-to-optical conversion circuit for generating an optical transmission signal by superimposing a transmission signal in a radio frequency band and the calibration signal on an optical wave; an optical input and output unit for sending the optical transmission signal to an optical transmission path and receiving a reflection signal that is a part of the optical transmission signal from an optical reception device; an optical-to-electrical converter for converting the reflection signal into a radio frequency signal; a phase locked loop for generating the oscillation control signal so that radio frequency output of the optical-to-electrical converter is phase-locked with a reference signal input from a reference signal source; and a signal generation circuit for generating, as the transmission signal, the radio frequency signal phase-locked with the calibration signal.
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公开(公告)号：US10253756B2
公开(公告)日：2019-04-09
申请号：US16072233
申请日：2016-02-05
发明人： Eisuke Haraguchi , Toshiyuki Ando
摘要： A configuration is provided which includes: a reference light source to emit laser light; an optical phase modulator to perform phase modulation of transmission light of the laser light on the basis of a linear-phase-modulation signal having a first frequency component and a second frequency component; an optical intensity modulator to modulate light intensity of the transmission light on the basis of a pulsed light generation signal for generation of pulsed light; first and second optical antennas to emit the transmission light to a space and receive reflected light from a first point and a second point; an optical receiver to perform heterodyne detection on light obtained by mixing received light and local oscillation light; and a signal processor to separate a received signal on the basis of the first and the second frequency components.
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公开(公告)号：US11977158B2
公开(公告)日：2024-05-07
申请号：US17008184
申请日：2020-08-31
发明人： Toshiyuki Ando , Jiro Suzuki , Eisuke Haraguchi
摘要： A laser radar device performs control to make a focus distance of transmission light equal to a measurement distance by switching a plurality of laser light sources that emit beams of oscillation light having wavelengths different from each other to switch emission directions of the transmission light while maintaining the focus position of optical antennas, and changing the wavelength of the beams of oscillation light according to the measurement distance.
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公开(公告)号：US11835844B2
公开(公告)日：2023-12-05
申请号：US17712667
申请日：2022-04-04
CPC分类号： G02F2/02 , H01S3/067 , H04B2210/006
摘要： An optical frequency control device includes: a detection circuit to receive first light including a first frequency, receive second light including a second frequency, modulate the first light with a local oscillation signal, and detect a differential beat signal between the frequency of sideband light included in the modulated first light and the second frequency; a light source control circuit to change the second frequency by frequency-dividing the differential beat signal with a first frequency division number, by frequency-dividing a reference signal with a second frequency division number, and by outputting a phase error signal indicating a phase difference between the frequency-divided differential beat signal and the frequency-divided reference signal; and a signal processing unit to set each of the first frequency division number and the second frequency division number according to the set value of a frequency difference between the first frequency and the second frequency.
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公开(公告)号：US11709229B2
公开(公告)日：2023-07-25
申请号：US16343584
申请日：2016-12-21
发明人： Toshiyuki Ando , Eisuke Haraguchi , Hitomi Ono
CPC分类号： G01S7/4814 , G01S7/4813 , G01S17/26
摘要： A laser radar device includes: a modulator (8) for causing a transmission seed light beam to branch, and giving different offset frequencies to a plurality of the transmission seed light beams having branched, and then modulating the plurality of transmission seed light beams into pulsed light beams and outputting the pulsed light beams, or for modulating the transmission seed light beam into a pulsed light beam, causing the pulsed light beam to branch, and giving the different offset frequencies to a plurality of the pulsed light beams having branched, and then outputting the plurality of pulsed light beams; a band pass filter (14) in which a frequency band including frequencies of signal components included in a plurality of beat signals detected by an optical heterodyne receiver (13) is set as a pass band and a frequency band not including the frequencies of the signal components is set as a cutoff band; and an ADC (15) for sampling the beat signals passing through the band pass filter (14) at a sampling frequency.
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公开(公告)号：US11683115B2
公开(公告)日：2023-06-20
申请号：US17545004
申请日：2021-12-08
发明人： Eisuke Haraguchi , Toshiyuki Ando
CPC分类号： H04J14/02 , H01Q3/26 , H04B10/506
摘要： An optical control type phased array antenna includes: a plurality of antenna elements; a multi-wavelength light source; an optical demultiplexing circuit for separating a plurality of optical signals and local oscillation light from output light of the multi-wavelength light source; optical modulators for generating a plurality of modulated optical signals by modulating the plurality of optical signals with the output signals of the plurality of antenna elements; an optical coupler for multiplexing the plurality of modulated optical signals and the local oscillation light to generate multiplexed light and dividing the multiplexed light into reception optical signals of a plurality of channels; and an optical dispersion compensation circuit for compensating for a phase difference between the plurality of modulated optical signals by performing dispersion compensation on the reception optical signals, respectively.
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公开(公告)号：US11550042B2
公开(公告)日：2023-01-10
申请号：US16492551
申请日：2017-04-13
发明人： Eisuke Haraguchi , Toshiyuki Ando , Hitomi Ono
IPC分类号： G01S7/4865 , G01S7/48 , G01S7/481 , G01S7/484 , G01S17/58
摘要： A laser radar system according to the present invention includes: a light source to output light having a first frequency in a first period and light having a second frequency in a second period; an optical splitter to split the lights, outputted from the light source, into signal light and local oscillator light; an optical modulator to modulate the signal light into pulsed light; an optical antenna to output the pulsed light into space and to receive, as reception light, the scattered light from a target; an optical heterodyne receiver to perform heterodyne detection on the reception light by using the local oscillator light; and a measurement unit to measure the distance to the target or the movement characteristics of the target by using the reception signal detected by the optical heterodyne receiver, wherein the optical heterodyne receiver performs the heterodyne detection on the first frequency of the reception light by using the second frequency of the local oscillator light. With this configuration, a large amount of frequency shift can be provided between the signal light and the local oscillator light, and thus, the distance to the target can be measured with high resolution by using short pulsed-light.
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公开(公告)号：US10234544B2
公开(公告)日：2019-03-19
申请号：US15036252
申请日：2014-12-08
摘要： An optical transmitter 1 includes an optical phase modulator 131 that performs phase modulation on a continuously oscillating light, a light intensity modulator 132 that performs pulse modulation on the light on which the phase modulation is performed, to output the light as a transmission light, a first signal generator 133 that generates a pulse modulation driving signal in which on and off time intervals are repeated periodically, to drive the optical intensity modulator 132, and a second signal generator 134 that generates a saw tooth wave driving signal having an amplitude equal to an integral multiple of a driving voltage needed to acquire a modulation phase of 2π of the optical phase modulator 131, and having a constant period, to drive the optical phase modulator 131.
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公开(公告)号：US11933903B2
公开(公告)日：2024-03-19
申请号：US16976401
申请日：2018-03-29
发明人： Shumpei Kameyama , Eisuke Haraguchi , Yutaka Kajiyama , Nobuki Kotake , Takayuki Yanagisawa , Toshiyuki Ando
摘要： An optical transmission unit (3) transmits an optical signal having a light intensity set as a Low level component of a pulse. An optical partial reflector (6) is provided on a path through which transmission light is transmitted from a circulator (5) to the atmosphere, and reflects the optical signal. A detection unit (11) performs coherent detection on reception light using, as local light, a signal in a Low level section in the optical signal reflected by the optical partial reflector (6).
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