Abstract: An optical transceiver (101) of an optical relay apparatus includes: a coherent reception front-end unit (110) that coherently detects an input optical signal to be input, based on local oscillation light, and outputs the coherently detected first analog electric signal; a coherent transmission front-end unit (120) that coherently modulates a second analog electric signal acquired by turning around the first analog electric signal, based on transmission light, and outputs the coherently modulated output optical signal; and an analog compensation unit (130) that performs analog signal processing on the first analog electric signal in such a way as to compensate for signal quality according to a signal characteristic between an input of the coherent reception front-end unit (110) and an output of the coherent transmission front-end unit (120), and thereby generates the second analog electric signal.

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.

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.

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.

Abstract: An optical amplifier that amplifies an incident WDM signal and includes cores having an amplification medium, the optical amplifier includes: a wavelength demultiplexer configured to demultiplex the incident WDM signal into wavelength bands and introducing the demultiplexed WDM signals into the cores separately; a wavelength multiplexer configured to multiplex amplified optical signals propagated through the cores and outputting the multiplexed signal; and an wavelength demultiplexing controller configured to monitor an amplification rate of a specific wavelength band of an amplified WDM signal or a scale associated with an amplification rate of a specific wavelength band, demultiplexing, from the incident WDM signal, an optical signal of a wavelength band having relatively-small optical amplification efficiency according to a monitoring result, and controlling demultiplexing performed by the wavelength demultiplexer in such a way as to amplify, with a relatively-large amplification rate, the optical signal o

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.

Abstract: A monitoring system according to the present disclosure includes: a straight line calculation unit configured to calculate a straight line connecting three-dimensional coordinates of a light source and three-dimensional coordinates of a three-dimensional measuring device configured to measure a target to be measured; an invalid region determination unit configured to define a three-dimension invalid region in which point cloud data acquired by the three-dimensional measuring device is invalid based on the straight line; and a point cloud data processing unit configured to monitor the target to be measured based on the acquired point cloud data and the three-dimension invalid region.

Abstract: The optical transmission system of the present invention includes a multi-core transmission path which includes a plurality of cores, and in which optical signals propagate through the plurality of cores, a first optical repeating means for amplifying the optical signals by individually exciting first multi-core optical amplification mediums, and a second optical repeating means for amplifying the optical signals by collectively exciting second multi-core optical amplification mediums, wherein the first optical repeating means is positioned spaced apart from the second optical repeating means by a distance determined on the basis of either a first transmissible distance due to the first optical repeating means and a second transmissible distance due to the second optical repeating means.

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.

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.

Abstract: To suppress the deterioration of the characteristics of a MIMO equalizer as well as minimizing an increase in circuit size in spite of the occurrence of signal spectrum narrowing and asymmetric spectrum degradation, a wavelength-division multiplexing optical transmission system (10) according to an embodiment includes a transmitter (1) that generates one channel signal by wavelength-division multiplexing a plurality of subcarrier signals so as to overlap each other and transmits the channel signal, and a receiver (2) that separates a received channel signal into subcarrier signals, and performs equalization using an MIMO equalizer (3) including a FDE-MIMO equalizer (4) and a TDE-MIMO equalizer (5) on each of the separated subcarrier signals.

Abstract: An optical measurement device (10) according to the present disclosure includes a light-transmitting unit (11) that transmits ranging light for Time of Flight (ToF) ranging, a light-receiving unit (12) that receives reflection light reflected from a measurement object by the ranging light transmitted by the light-transmitting unit (11), a Doppler shift amount calculation unit (13) that calculates a Doppler shift amount of a frequency of the reflection light, based on a phase change amount of the reflection light received by the light-receiving unit (12), and a relative speed calculation unit (14) that calculates a relative speed of the measurement object, based on the Doppler shift amount calculated by the Doppler shift amount calculation unit (13).

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

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.

Abstract: A distance measurement apparatus comprises a distance measurement optical signal generation part, a collimating part, a beam diameter change part, an emission direction control part, and a beam diameter change control part. The distance measurement optical signal generation part generates an optical signal for measuring the distance to a target. The collimating part collimates the optical signal. The beam diameter change part is able to change a beam diameter of the collimated light. The emission direction control part controls an emission destination of the collimated light with the diameter changed. The beam diameter change control part controls the changing of the beam diameter by the beam diameter change part according to the emission direction of an outgoing.

Abstract: Light amplification devices using coupled multi-core optical fibers have a figure of merit that temporally varies, which makes it difficult to perform performance evaluation and to build a light transmission system using the same. Accordingly, a light amplification device of the present invention comprises: a band control means that controls the wavelength band of a light carrier to generate a band control light; and a band control light amplification means that has a plurality of light amplification media through which the band control light propagates, wherein the band control light amplification means amplifies the band control light in a coupled state in which the light propagating through the plurality of light amplification media induces a crosstalk and wherein the band control means controls the wavelength band such that the band control light having propagated through the plurality of light amplification media has a reduced coherence.

Abstract: To suppress the deterioration of signal quality in an optical signal, a LiDAR device comprises: a signal output means 20 for outputting a first electric signal in a first period, reducing the amplitude of the first electric signal outside the first period, and then outputting a second electric signal; a modulator 30 which outputs an optical signal modulated on the basis of the first electric signal or the second electric signal; and a control means 40 for applying, to the modulator 30, a bias voltage based on the optical signal modulated on the basis of the first electric signal.

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.

Abstract: An optical ranging device (10) according to the present disclosure includes a light pulse generation unit (11) that generates a light pulse with a phase change point between a first phase modulation portion and a second phase modulation portion, a light-transmitting unit (12) that transmits the generated light pulse, a light-receiving unit (13) that receives a light pulse reflected from a measurement object by the transmitted light pulse, and a distance calculation unit (14) that calculates a distance to the measurement object, based on a phase change point of the transmitted light pulse and a phase change point of the received light pulse.

Abstract: A distance measurement device (2000) generates transmission light by modulating an optical carrier wave. The distance measurement device (2000) transmits the generated transmission light, and receives reflected light acquired by the transmission light being reflected by a measured object (10). The distance measurement device (2000) generates a first beat signal by causing the transmission light to interfere with reference light. The distance measurement device (2000) generates a second beat signal by causing the reflected light to interfere with the reference light. The distance measurement device (2000) calculates a distance to the measured object (10), based on a difference between the first beat signal and the second beat signal.