17 results about "Crosstalk measurement" patented technology

The present invention relates to the technical field of optical communication. Disclosed are a method for calibrating crosstalk between channels of a coherent transmitter and receiver, an apparatus, and a system. The method comprises: a coherent transmitter loads generated auxiliary calibration signals on four channels of the coherent transmitter and sends same to a coherent receiver, the generated auxiliary calibration signals being multi-carrier signals which are orthogonal to one another between channels and the subcarrier frequency amplitudes of which increase as frequency increases; and the coherent transmitter receives crosstalk calibration issued by the coherent receiver, performs frequency-dependent crosstalk compensation on the basis of the crosstalk calibration, and sends a compensated calibration service signal to the coherent receiver, the crosstalk calibration being a crosstalk value obtained by the coherent receiver performing crosstalk angle reconstruction-based frequency-dependent crosstalk measurement on the basis of the auxiliary calibration signals. The present invention can solve the technical problems that the existing inter-channel crosstalk calibration technology has high complexity and poor accuracy and cannot be applied to coherent optical modules having different rates and modulation formats, and meets actual application requirements.

The utility model discloses crosstalk measuring equipment, which comprises a shell, a screen hanging window for hanging a screen to be measured is arranged on the shell, and the window size of the screen hanging window is matched with the size of a display area of the screen to be measured; the device further comprises an image acquisition device and a data processing device, the image acquisition device faces the screen hanging window and is arranged in the shell, and the data processing device is electrically connected with the to-be-tested screen and the image acquisition device. According to the utility model, a reliable darkroom environment is provided for the three-dimensional display screen through the screen hanging window arranged on the shell, so that the crosstalk measurement of the three-dimensional display screen is realized through the cooperation of the data processing device and the image acquisition device, the measurement process is effectively simplified, and the crosstalk measurement efficiency and precision are greatly improved.

This crosstalk measurement device (1) for an optical device has a core (11) and a core (12), the core (11) and the core (12) including one end and the other end and being parallel to each other, and is provided with: a connection optical fiber (51) that optically connects the other end (18) of the core (11) and the other end (18) of the core (12); an optical member that is provided closer to the core (11) side than the midpoint (C) of the optical fiber (51) for connection, and that has a greater loss of light incident from the core (11) side to the core (12) side than the loss of light incident from the core (12) side to the core (11) side; an OTDR (20) that causes incident light to enter from one end (17) of the core (11) and measures the power of emitted light emitted from the one end (17) of the core (11), the emitted light including crosstalk light (CL) generated by crosstalk of the incident light from the core (11) to the core (12); and a processing unit (25) that determines the magnitude of crosstalk between the core (11) and the core (12) using the measured power of the emitted light.

A crosstalk measuring method includes: preparing a printed wiring board having a first signal pattern and a second signal pattern arranged side by side at an interval in a first direction and extending in a second direction orthogonal to the first direction, and a ground pattern disposed between the first signal pattern and the second signal pattern in the first direction and extending in the second direction; preparing a probe having a first pin, a second pin, and a shield plate that is made of a conductive material; and measuring crosstalk between the first signal pattern and the second signal pattern. Each of the first pin and the second pin has a distal end and a proximal end opposite to the distal end.

The present invention belongs to the field of optical fiber measurement technology, and specifically relates to a distributed polarization crosstalk measurement device with ultra-high sensitivity polarization beam splitting detection. The device includes a tunable laser source module, a device under test module, a polarization beam splitting interferometer module, an auxiliary interferometer module, and a signal acquisition and analysis module. The device is characterized by: using a polarization beam splitter to separate the transmission mode and coupling mode light passing through the device under test to suppress the main interference peak, thereby improving the sensitivity to ‑130dB; under the condition of equal light source output power, the amplitude of the optical signal output by the polarization beam splitter can be increased by four times compared with traditional solutions; the invention, combined with a tunable laser, gets rid of the dependence on an optical path scanning delay device in polarization crosstalk measurement, realizes an all-fiber structure without moving parts, enhances the reliability and stability of the test system, and greatly improves the speed and sensitivity of polarization crosstalk measurement in principle.

The application belongs to the technical field of optical fiber measurement, and particularly relates to an optical frequency domain polarimeter of polarization beam splitting structure frequency shift detection with ultra-high sensitivity, which comprises a tunable laser source module, a device to be measured module, a polarization beam splitting frequency shift interferometer module, an auxiliary interferometer module and a signal acquisition and analysis module, and is characterized in that: a frequency shifter contained in the polarization beam splitting frequency shift interferometer module is used to move the signal to a high frequency, thereby avoiding the noise aliasing problem from a low frequency; a polarization beam splitter is used to separate the transmission mode and the coupling mode light passing through the device to be measured to suppress the main interference peak, thereby improving the sensitivity to-130 dB, and greatly improving the speed and sensitivity of the polarization crosstalk measurement in principle. Meanwhile, the main extended optical fiber and the acousto-optic modulator are combined to shift the signal, thereby meeting the acquisition of the polarization crosstalk information when the long-distance device is tested.

Methods for measuring crosstalk in an electronic circuit having multiple ports comprises determining two ports of interest of the electronic circuit, in which crosstalk will be measured between. Furthermore, the method includes determining one or more ports of the electronic circuit to be terminated, independent from the ports of interest, so that signals of these ports do not interfere with measuring crosstalk between the two ports of interest. To terminate the ports determined to be terminated, a piece of absorber sheet is used to cover the ports determined to be terminated. Pressure is applied to the piece of absorber sheet such that the piece of absorber sheet makes a good contact and absorbs signals traveling into the ports determined to be terminated, thereby terminating the ports determined to be terminated so that crosstalk between the two ports of interest may be effectively measured.

The invention discloses a light-induced thermoelastic multi-component gas detection device and method based on quadrature modulation, which adopts a technical path combining double-path quadrature phase modulation and single-path quadrature demodulation, that is, two tunable lasers are respectively driven by sinusoidal signals with the same modulation frequency but orthogonal phases; the two laser beams are combined by the wavelength division multiplexer, collimated by the collimator, acted by the gas chamber and the gas and focused by the lens and then radiated to the surface of the quartz tuning fork, a piezoelectric signal generated by the quartz tuning fork comprises excitation mixing information of the two gases, and the signal is amplified by the preamplifier and then sent to the lock-in amplifier; and the phase-locked amplifier synchronously calculates two components X and Y which are orthogonal to each other according to a reference signal with the same frequency as the laser modulation signal, and the two components respectively and independently correspond to the concentration information of the two target gases, so that real-time, synchronous and crosstalk-free measurement of the two-component gases is realized.

This inter-spatial channel crosstalk measuring method involves measuring inter-spatial channel crosstalk in a space division multiplexed optical system which has a first input / output unit and a second input / output unit on the side opposite to the first input / output unit, and also has a first spatial channel and a second spatial channel. This method comprises: a first step for forming or providing a light reflecting surface at the second input / output unit; a second step for inputting testing light into the first spatial channel at the first input / output unit; a third step for causing at least partial light of the testing light to be reflected at the light reflecting surface; a fourth step for detecting first light power which is the power of light that is a portion of said partial light outputted from the first spatial channel at the first input / output unit and second light power which is the power of light that is a portion of said partial light outputted from the second spatial channel at the first input / output unit; and a fifth step for calculating the magnitude of crosstalk between the first spatial channel and the second spatial channel on the basis of the first light power and the second light power.

The application provides a crosstalk measurement method and a crosstalk measurement device. The crosstalk measurement method comprises controlling a stereoscopic display device to display a preset planar color image, the preset planar color image comprising N view picture groups, each view picture group comprising N view pictures, the Mth view picture in the Mth view picture group corresponding to display a first color, and other view pictures corresponding to display a second color, wherein M is greater than or equal to 1, and M is less than or equal to N, N is a positive integer greater than or equal to 2; at a preset distance from the stereoscopic display device, obtaining the tristimulus value of a mixed color generated by mixing the first color and the second color according to each stereoscopic view picture imaged by the stereoscopic display device; obtaining the reference tristimulus value of the first color and the reference tristimulus value of the second color, and determining the crosstalk value of the stereoscopic display device according to the tristimulus value of the mixed color, the reference tristimulus value of the first color and the reference tristimulus value of the second color.

The invention belongs to the technical field of photon detection, and particularly relates to a Geiger mode single-photon focal plane crosstalk measurement device and method, and the device comprises a beam expander, a deformable mirror, a beam splitter BS1, a beam splitter BS2, an industrial personal computer, an alignment camera, an observation camera, and a photoelectric detector. According to the method, the wavefront sensor and the deformable mirror are combined to carry out real-time measurement feedback and correction on incident wavefront, a high-quality plane wave is formed, a standard small light spot close to the diffraction limit can be formed after the plane wave is converged through the focusing system, and accurate measurement of the crosstalk of the single-photon focal plane is achieved.

The application discloses an AI shoe structure generation design method based on feature decoupling and topology maintenance, relates to the technical field of digital manufacturing, and comprises the following steps: constructing condition control parameters according to crosstalk measurement parameters, and performing topology consistency measurement on a structure state constrained by the condition control parameters to generate a topology risk field map; evaluating the risk level of the topology risk field map, freezing high-risk areas on the topology risk field map, generating a local structure freezing mask and a freezing curve index set, performing selected area consistency write-back processing and process constraint checking on the local structure freezing mask and the freezing curve index set, and outputting a manufacturable material mapping table. The application synchronously generates a topology risk field map by calculating crosstalk measurement parameters, quantitatively predicts potential influences of style creativity on structure integrity, and realizes end-to-end connection from digital space risk evaluation to manufacturing constraints in the physical world.

The application discloses a kind of inter-channel crosstalk calibration method, device and system of coherent transceiver, it is related to optical communication technical field.The method comprises: the auxiliary calibration signal generated is loaded on the four-way channel of coherent transmitter and sent to coherent receiver;Wherein, the auxiliary calibration signal generated is inter-channel mutually orthogonal and the multi-carrier frequency signal of sub-carrier frequency amplitude increases with frequency rise;Coherent transmitter receives the crosstalk calibration issued by coherent receiver, carries out frequency-dependent crosstalk compensation based on crosstalk calibration, and sends the calibrated service signal after compensation to coherent receiver;Wherein, crosstalk calibration is the crosstalk value obtained by coherent receiver according to auxiliary calibration signal and based on the frequency-dependent crosstalk measurement of crosstalk angle reconstruction.The present application can solve the technical problems that the existing inter-channel crosstalk calibration technology has high complexity, poor precision and cannot be applied to different rate and modulation format coherent optical modules, meet the actual application demand.

A crosstalk measuring method includes a connecting step S1 of optically connecting another end 18 of a core 11 and another end 18 of a core 12 via a core of a first optical fiber 51, a first measuring step S2 of causing pulsed incident light L to enter from one end 17 of the core 11 from an OTDR 20, and measuring power of emitted light emitted from the one end 17 of the core 11 by the OTDR 20, the emitted light including pulsed crosstalk light CL1 in which light generated by crosstalk of the incident light L from the core 11 to the core 12 and light generated by crosstalk of the incident light L incident from the core 11 to the core 12, the crosstalk being from the core 12 to the core 11, are multiplexed, the processing step S3 of obtaining the magnitude of the crosstalk between the core 11 and the core 12 using the measured power of the emitted light.

The application provides a crosstalk measurement method and device for coaxial cables of a dilution refrigerator, the dilution refrigerator and a superconducting quantum computing device. The crosstalk measurement method comprises: loading a square wave pulse signal to one end of a reference coaxial cable group through an arbitrary wave generation component; collecting amplitude information of the square wave pulse signal at the other end of the reference coaxial cable group through a first port of an oscilloscope component; collecting ground crosstalk peak value information and spatial crosstalk peak value information of a crosstalk pulse signal at the other end of a crosstalk measurement coaxial cable group after amplification processing by a signal amplification component through a second port of the oscilloscope component; and determining a crosstalk ratio of a crosstalk type according to the amplitude information, the ground crosstalk peak value information and the spatial crosstalk peak value information; wherein the crosstalk type comprises a ground crosstalk type and a spatial crosstalk type, and the crosstalk ratio comprises a ground crosstalk ratio and a spatial crosstalk ratio.

An information processing device (1) has a measurement pattern generation unit (11) and a crosstalk parameter calculation unit (15). The measurement pattern generation unit (11) generates a crosstalk measurement pattern. The crosstalk parameter calculation unit (15) applies a measurement result of the crosstalk measurement pattern to a crosstalk model (21) including a plurality of deterioration characteristics to calculate a crosstalk parameter (23) set for each deterioration characteristic.

The application provides a signal crosstalk measurement system and method of a multi-line laser radar, wherein the system comprises: the signal crosstalk measurement system comprises a target mounting seat, a laser emitter, a signal output device and a controller; the multi-channel receiving unit of the multi-line laser radar to be measured is placed opposite the target mounting seat, wherein the first target is an object with a diffuse reflection characteristic of low reflectivity, so that the output signal of any receiving unit in the multi-channel receiving unit is below the background noise; and the second target is an object with a specular reflection characteristic; the power-adjustable light beam output by the laser emitter covers the multi-channel receiving unit after being reflected by the second target; the controller is electrically connected with the laser emitter and the signal output device, respectively, and is used for generating the signal crosstalk parameters corresponding to the multi-channel receiving unit according to the output signal of the multi-channel receiving unit. The application can accurately measure the signal crosstalk of the multi-line laser radar.