6 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 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 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.

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.

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.