29 results about "Crosstalk measurement" patented technology

The present invention belongs to the field of optical fiber measurement technology, and specifically relates to an optical fiber distributed polarization crosstalk fast measurement device based on optical frequency domain interference. The device comprises a tunable laser source module (1), a device to be measured module (2), an auxiliary interferometer module (3) and a signal acquisition and analysis module (4), and is characterized in that: a high-coherence tunable laser is used to perform fast wavelength scanning on an optical signal, and a linear frequency modulated continuous light (501) is output, which passes through a polarizer (202), a device to be measured (206) and an analyzer (210) in sequence, and a beat frequency signal generated by the interference of a coupling light (704) and a transmission light (701) is obtained in the optical frequency domain, and then an optical path difference and a normalized interference signal amplitude are calculated, thereby respectively determining the polarization crosstalk position and intensity. The present invention, in combination with a tunable laser, gets rid of the dependence on an optical path scanning delay device in polarization crosstalk measurement, greatly improves the speed and dynamic range of polarization crosstalk measurement, and has a compact structure, is stable and reliable, and is easy to implement.

A crosstalk measurement device (1) is characterized by comprising: a first optical switch (61) capable of selectively switching to any one of a plurality of optical waveguides; a connection optical waveguide for optically connecting the other end (18) of one optical waveguide and the other end (18) of another one optical waveguide among the plurality of optical waveguides; an OTDR (20) that is optically connected to one end of the one optical waveguide via the first optical switch (61), causes light to enter the one optical waveguide from one end (17) thereof as incoming light, and measures the power of light emitted from the one end of the one optical waveguide, the emitted light including crosstalk light (CL1) generated through crosstalk of the incoming light between the one optical waveguide and the other one optical waveguide; and a processing unit (25) for determining crosstalk between the one optical waveguide and the other one optical waveguide by using the measured power of the emitted light.

The invention discloses a method, a device and a system for calibrating crosstalk between channels of a coherent transceiver, and relates to the technical field of optical communication. The method comprises the following steps: a coherent transmitter loads generated auxiliary calibration signals on four channels of the coherent transmitter and sends the auxiliary calibration signals to a coherent receiver; wherein the generated auxiliary calibration signal is a multi-carrier frequency signal of which the channels are mutually orthogonal and the sub-carrier frequency amplitude is increased along with the increase of the frequency; the coherent transmitter receives the crosstalk calibration issued by the coherent receiver, performs frequency-dependent crosstalk compensation based on the crosstalk calibration, and sends the compensated calibration service signal to the coherent receiver; wherein the crosstalk calibration is a crosstalk value obtained by performing frequency-dependent crosstalk measurement based on crosstalk angle reconstruction by the coherent receiver according to the auxiliary calibration signal. The technical problems that an existing inter-channel crosstalk calibration technology is high in complexity, poor in precision and not suitable for coherent optical modules of different rates and modulation formats can be solved, and actual application requirements are met.

The present invention belongs to the field of optical fiber measurement technology, and specifically relates to a distributed polarization crosstalk fast measurement device based on optical frequency domain frequency shift interference, the device includes a tunable laser source module, a device to be measured module, a main interferometer module, an auxiliary interferometer module and a signal acquisition and analysis module, and is characterized in that: a tunable laser is used to perform fast wavelength scanning, a main interferometer is used to perform frequency shift on an interference beat frequency signal, and the position and intensity of polarization crosstalk are determined by obtaining the optical path difference between coupled light and transmitted light and the normalized interference signal amplitude, while also eliminating the signal aliasing problem caused by 1 / f flicker noise at low frequencies and light source frequency scanning nonlinearity. The present 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 signal-to-noise ratio of polarization crosstalk measurement in principle.

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 invention provides a crosstalk measurement method and device for a coaxial cable of a dilution refrigerator, the dilution refrigerator and superconducting quantum computing equipment. The crosstalk measurement method comprises the following steps: loading a square wave pulse signal to one end of a reference coaxial cable group through an arbitrary wave generation assembly; acquiring amplitude information of a square wave pulse signal at the other end of the reference coaxial cable group through a first port of the oscillographic assembly; acquiring grounding crosstalk peak information and space crosstalk peak information of the crosstalk pulse signal amplified by the signal amplification component at the other end of the crosstalk measurement coaxial cable group through a second port of the oscillographic component; determining a crosstalk proportion of the crosstalk type according to the amplitude information, the grounding crosstalk peak information and the space crosstalk peak information; wherein the crosstalk type comprises a grounding crosstalk type and a space crosstalk type, and the crosstalk proportion comprises a grounding crosstalk proportion and a space crosstalk proportion.

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.

This crosstalk measurement device (1) for an optical device, which has a core (11) and a core (12) that include one end and another end and are parallel to each other, comprises: 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 component that is provided more on the core (11) side than a midpoint (C) of the connection optical fiber (51) and has a larger loss of light incident on the core (12) side from the core (11) side than the loss of light incident on the core (11) side from the core (12) side; an OTDR (20) that causes incident light to be incident from the one end (17) of the core (11) and measures the power of emitted light which is emitted from the one end (17) of the core (11) and includes crosstalk light (CL1) generated by crosstalk of the incident light from the core (11) to the core (12); and a processing unit (25) that obtains the magnitude of crosstalk between the core (11) and the core (12) using the measured power of the emitted light.

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.

To provide a crosstalk measurement method and cross-talk measurement device that can measure crosstalk, using an OTDR, and to provide a light loss measurement method and light loss measurement device that can measure a loss of light of a waveguide having an impact of the crosstalk suppressed, using the OTDR.SOLUTION: A crosstalk measurement method comprises: a first measurement step of making first incidence light incident from one end of a first waveguide, and almost simultaneously making second incidence light incident from one end of a second waveguide, and measuring power of emitting light emitted from one end 17 of a first light waveguide by an OTDR 20; a second measurement step of making the first incidence light from the one end 17 of the first light waveguide, making light from the OTDR 20 non-incident upon the second light waveguide, and measuring power of emitting light emitted from the one end 17 of the first light waveguide by the OTDR 20; and a processing step of using the power of the emitting light measured in the first measurement step and second measurement step to obtain crosstalk of the first light waveguide.SELECTED DRAWING: Figure 2

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.

The crosstalk measurement method includes: a step of preparing a printed wiring board having a first signal pattern, a second signal pattern, and a ground pattern, the first signal pattern and the second signal pattern being arranged at intervals in a first direction and extending in a second direction orthogonal to the first direction, the ground pattern is disposed between the first signal pattern and the second signal pattern in the first direction and extends along the second direction. A step of preparing a probe having a first probe, a second probe, and a shield plate formed of a conductive material; and a step for measuring crosstalk between the first signal pattern and the second signal pattern. The first probe and the second probe each have a tip end and a base end, and the base end is an end on the opposite side from the tip end. The top end of the first probe and the top end of the second probe are in contact with the first signal pattern and the second signal pattern respectively.

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.

A crosstalk measurement method is provided with: a connection step S1 in which the other end (18) of a core (11) and the other end (18) of a core (12) are optically connected via the core of a first optical fiber (51); a first measurement step (S2) in which pulsed incident light (L) is made to enter from one end (17) of the core (11) by the OTDR (20), and the power of emitted light emitted from the one end (17) of the core (11) is measured by the OTDR (20), the emitted light including pulsed crosstalk light (CL1); the crosstalk light (CL1) is obtained by multiplexing light generated by crosstalk of incident light (L) from the core (11) to the core (12) and light generated by crosstalk of incident light (L) incident from the core (11) to the core (12) from the core (12) to the core (11). And a processing step (S3) in which the magnitude of crosstalk between the core (11) and the core (12) is determined using the measured power of the emitted light.

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.

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 present invention provides a method and device for measuring inter-mode crosstalk, the device comprising: a light source module, the light source module is connected to the input end of the discrete mode device under test, and is used to provide linearly polarized light; an acquisition module, the acquisition module is optically connected to the discrete mode device under test, and is used to acquire the optical frequency domain waveform of the light field on the image plane at the optical mode field, the optical mode field is the light field emitted by the end face of the few-mode pigtail of the discrete mode device under test under the action of the linearly polarized light; a processing module is connected to the acquisition unit, and is used to acquire the inter-mode crosstalk information of the discrete mode device under test according to the optical frequency domain waveform of the light field. The scheme of the present invention can simply and accurately measure the inter-mode crosstalk of the discrete mode device.

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.

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.