Abstract: A method for ascertaining an optical crosstalk of a lidar sensor. The method includes: emitting a laser light of the lidar sensor, receiving a signal of a light detector of the lidar sensor representing components of the laser light reflected or scattered. The light detector has a first receive region, the extension and position of which on the light detector corresponds to an extension and position of the laser light imaged onto the light detector when a scattering of the laser light is equal to or less than a predefined threshold value. The light detector has a second receive region directly adjoining the first receive region and which detects components of the laser light imaged onto the light detector when the scattering of the laser light is greater than the predefined threshold value.

Abstract: Example embodiments relate to using cleaning protocols to monitor defects associated with light detection and ranging (lidar) devices. An example embodiment includes a method. The method includes applying, using a cleaning device, a cleaning protocol to one or more optical components of a light detection and ranging (lidar) device. The method also includes emitting, from a light emitter of the lidar device, one or more light signals. Additionally, the method includes detecting, by a light detector of the lidar device, reflections of the one or more light signals. Further, the method includes determining, by a controller of the lidar device based on the detected reflections of the one or more light signals, that one or more defects are present within the one or more optical components or within the cleaning device.

Abstract: The present disclosure relates to central units and remote units. One example central unit includes at least one digital-to-analog converter (DAC), at least one first electro-optical converter configured to convert an analog electrical signal output by the DAC into an analog optical signal, at least one first optical processor configured to process the analog optical signal output by the first electro-optical converter, where the first optical processor includes at least one of at least one first optical filter, at least one first optical phase shifter, and at least one first optical power amplifier, a first multiplexer configured to combine analog optical signals output by the first optical processor into one analog optical signal, and a first demultiplexer configured to decompose the one analog optical signal into multiple analog optical signals at different wavelengths.

Abstract: A distance measurement device includes an imaging unit which captures a subject image formed by an imaging optical system, an emission unit which emits directional light as light having directivity along an optical axis direction of the imaging optical system, a light receiving unit which receives reflected light of the directional light from the subject, a derivation unit which derives a distance to the subject based on the timing at which the directional light is emitted and the timing at which the reflected light is received, a display unit which displays the subject image, and a control unit which performs control such that, in a case of performing a distance measurement, the display unit displays the subject image as a motion image and transition is made to a state where actual exposure by the imaging unit is possible at the timing of the end of the distance measurement.

Abstract: A LIDAR system transmits a system output signal from the LIDAR system such that a sample region is illuminated by the system output signal. The LIDAR system includes a first light signal combiner configured to combine light that returns to the LIDAR system from the system output signal with light from a reference signal so as to generate a composite signal beating at a composite beat frequency. The LIDAR system includes a local light signal combiner configured to combine a first local signal with a second local signal so as to generate a local beating signal beating at a local beat frequency. The reference signal, the system output signal, the first local signal, and the second local signal each includes light from an outgoing LIDAR signal. The LIDAR system also includes electronics that perform a calculation of LIDAR data for the sample region.

Abstract: A method of reducing the power consumption of an optical fiber amplifier by which the optical output of a first optical fiber is filtered to prevent a detrimental portion of the optical output from reaching a second optical fiber, to transmit a signal for amplification, and to transmit a portion of the optical output that can contribute to optical pumping of the second optical fiber. By propagating an optical pumping portion output from the first optical fiber, as well as optical pumping from an independent source, the independent source's power level can be reduced. In a sequence of optical fibers, each fiber can provide some pumping output to one or more other fibers, as long as its optical output is properly filtered with appropriate optical components, such as a band-stop filter. A sequence can be terminated by a low-pass filter in order for a final output to contain the amplified signal free from any other optical output.

Abstract: A VCSEL array has VCSEL sub-arrays having VCSELs on a substrate. The sub-arrays are electrically contacted by a first electrical contact arrangement common to the VCSELs within a respective sub-array and a second electrical contact arrangement. The second electrical contact arrangement has second electrical contacts contacting a respective VCSEL within the respective sub-array, individually. The second electrical contacts each has a second metal-semiconductor interface to a second semiconductor layer of an associated VCSEL. The second electrical contacts pump the VCSEL along a current path to the first electrical contact arrangement. Current paths between the first electrical contact arrangement and the second electrical contacts via the VCSELs have a symmetry selected out of the group of rotation symmetry, mirror symmetry, and translation symmetry. The first electrical contact arrangement and the second electrical contact arrangement are arranged on the same side of the substrate.

Abstract: A distance measuring apparatus according to an embodiment of the present disclosure includes a light-receiving unit, a histogram acquiring unit, and an operation unit. The light-receiving unit receives reflected light from a distance measurement target. The reflected light is based on irradiation light from a light-emitting unit. The histogram acquiring unit acquires a histogram indicating the frequency of reception of the reflected light at the light-receiving unit. The operation unit calculates a distance to the distance measurement target on the basis of a time corresponding to a peak of the histogram acquired by the histogram acquiring unit. The operation unit corrects the distance calculated on the basis of the time corresponding to the peak of the histogram on the basis of the shape of the histogram acquired by the histogram acquiring unit.

Abstract: A method, apparatus, and system detects a speed of a vehicle. A backscatter light generated in response to transmitting a laser beam into an atmosphere during movement of the vehicle is received. A first beat frequency from interfering a first portion of the backscatter light with a reference light derived from the laser beam is measured. A time delay is introduced to a second portion of the backscatter light to form a time delayed backscatter light. A second beat frequency from interfering the time delayed backscatter light with the reference light is measured. The second beat frequency is time delayed from the first beat frequency. A difference between the first beat frequency and the second beat frequency is determined. The speed of the vehicle using the difference between the first beat frequency and the second beat frequency is determined.

Abstract: A ranging sensor includes a pixel including a photoelectric conversion element, a first storage node and a second storage node that store charge transferred from the photoelectric conversion element, a first transfer gate and a second transfer gate connected to the photoelectric conversion element so as to branch and transfer the charge generated in the photoelectric conversion element to different paths, a third transfer gate connected between the first storage node and the first transfer gate, a fourth transfer gate connected between the second storage node and the second transfer gate, a fifth transfer gate connected between the first storage node and the second transfer gate, and a sixth transfer gate connected between the second storage node and the first transfer gate, the ranging sensor including a transfer gate drive unit that drives each of the first to sixth transfer gates.

Abstract: The present invention relates to a mobile terminal including a lighting unit, and a control method therefor. The mobile terminal according to one embodiment of the present invention comprises: a lighting unit having a plurality of light sources; a sensor unit for receiving light outputted from the lighting unit and reflected off a subject; and a control unit for synchronizing, through the sensor unit, areas at which lights outputted from the plurality of light sources are emitted, and controlling, on the basis of preset conditions, the lighting unit so that at least one of the plurality of light sources emits light.

Abstract: A temperature controller is used for a gain fiber of a fiber amplifier. The controller includes a heat transfer structure and one or more temperature sinks, such as cooling plates. The heat transfer structure supports the gain fiber and is disposed in thermal contact with it. Portions of the temperature sink(s) are disposed in different thermal conductivity with sections of the heat transfer structure. For example, the sinks may have different material properties and/or material thicknesses. Also, portions of the temperature sink(s) can have different cooling rates. The different thermal conductivities conduct the heat from parts of the gain fiber differently from one another. In the end, an onset of Stimulated Brillouin Scattering (SBS) on the laser light path can be mitigated by conducting heat from the gain fiber with the different thermal conductivities.

Abstract: An optical amplifier according to the present disclosure includes a first excitation light coupler, a first optical amplification medium, a first optical switch configured to output the optical communication signal output from the first optical amplification medium to either a first branch path HGP or a second branch path, and a second optical switch configured to transmit the optical communication signal transmitted through the branch path to downstream, and the first branch HGP path includes a second optical amplification medium, a second excitation light coupler configured to synthesize the optical communication signal and the excitation light directed towards the second optical amplification medium, and a first gain equalizer, and the second branch path includes a third excitation coupler configured to synthesize the optical communication signal and the excitation light directed towards the first optical switch, and a second gain equalizer.

Abstract: The present invention provides a dual-polarized Lidar receiving end based on an optical chip, including a module for receiving reflected light, a module for receiving local oscillator light, a plurality of frequency mixers, a plurality of detectors and a plurality of variable optical attenuators. The Lidar receiving end according to the present invention can receive and process two optical signals in an orthogonal polarization state. Compared with the existing Lidar design solution, a system on chip based on the optical chip according to the present invention implements monolithic integration of massive devices, and has the advantages of high stability, small volume and low weight and costs, and the like. It is relatively easy to increase a quantity of channels at the receiving end designed according to the present invention.

Abstract: A light detection and ranging (LiDAR) system includes a beam combining component to combine a first optical beam including a first polarization and a second optical beam including a second polarization into a single spatial mode optical beam, and a first beam splitting component to split the single spatial mode optical beam into a plurality of single spatial mode optical beams.

Abstract: There is provided continuous wave time of flight, CW-ToF, camera system comprising: one or more lasers for outputting laser light; one or more imaging sensors, the one or more image sensors each comprising a plurality of imaging pixels for accumulating charge based on incident light comprising reflected laser light off a first surface of an object; and a distance determination system coupled to the one or more imaging sensors.

Abstract: A method and device for determining distances to a scene determines a laser light pulse width PW that is smaller than a maximum time of flight TOFmax corresponding to a maximum distance Dmax by using a pulse width reduction factor N such that PW=(TOFmax?TDL)/N wherein TDL is a predefined delay window, determines a pulse frequency FP such that FP?1/((N+1)×PW+TDL), illuminates the scene with an illuminating pattern comprising a plurality of spatially separated pulsed laser beams having the determined pulse width and frequency, performs the detection as function of time during a detection time period TD divided in M=?×(N+1) consecutive detection time windows, with ??1, such that TD=M×(PW/?), identifies in what detection time windows reflected laser light is detected, and calculates a distance to the scene based on this identification.

Abstract: A sensor system comprises a LiDAR unit having an emitter for laser light having a wavelength of 900 nm to 1600 nm and a receiver for light over a wavelength range which is between 800 nm and 1600 nm and at least partly below the operating wavelength of the LiDAR sensor and a cover having a substrate layer made of thermoplastic material which is arranged such that IR light emitted by the LiDAR unit and received by the LiDAR unit passes through the cover.

Abstract: A gas laser amplifier includes a housing, discharge electrode pairs, and an optical resonator. The housing includes an entrance window that allows entry of a first laser beam from outside and an exit window that allows exit of the first laser beam amplified. Each of the discharge electrode pairs excites a laser gas supplied between discharge electrodes facing each other in the housing. The optical resonator causes a second laser beam to oscillate with a gain of the excited laser gas in a non-incident state where the first laser beam from outside the housing does not enter the housing through the entrance window. In an incident state where the first laser beam enters the housing through the entrance window, the optical resonator suspends the oscillation of the second laser beam.

Abstract: The present disclosure provides methods and systems for flight velocimetry employing at least one bleaching laser, at least one detection laser, at least one dichroic mirror, an objective, a detection system, and a nano stage to bleach a dye to form a bleached blot in a flow pathway.