11 results about "Phase conjugation" patented technology

The present invention relates to a method for determining an image referred to as a reconstructed image, the method comprising the following steps: a training step for reconstructing distortion correction using training data; and an inference step (Ei) comprising determining the reconstructed image by means of a phase conjugation method; the training step comprising training a variational network.

The application discloses a kind of based on semiconductor ring laser two-way chaos synchronization method and system, belong to nonlinear optics and chaos security communication technical field, solve the problem that existing chaos synchronization is high to laser symmetry requirement, vulnerable to parameter disturbance, communication security is insufficient.This method constructs master-slave type semiconductor ring laser SRL chaos synchronization structure, by phase conjugation light feedback drive main laser SRL-1 generates chaos signal, by one-way injection to slave laser SRL-2, optimization injection coefficient, frequency detuning, current matching and feedback phase etc.Parameter realizes two-way chaos synchronization.The synchronization coefficient of the application reaches 0.98 at most, can effectively weaken the influence of frequency detuning and current mismatch, greatly improve the stability and security of chaos security communication, applicable to long distance, high rate two-way chaos security communication system.

This invention provides a demodulation method and system for free-space optical communication links based on helical fractional orbital angular momentum. N data streams are loaded onto a Gaussian beam, and at least one modulated beam of helical fractional OAM (Optical Aspect-Oriented Motion) is generated through a spatial optical phase modulation module. After coaxial beam combining, the beam is emitted in free space and imaged onto the demodulation phase modulation module plane via an optical relay imaging system. A conjugate helical phase map is loaded to demodulate the target OAM, and the focusing optics module is adjusted to couple the peak of the target OAM beam into a single-mode fiber, while non-target OAM beams are isolated. After verifying the demodulation isolation, the demodulation phase map is switched to sequentially recover each data stream. This invention achieves hybrid multiplexing of helical fractional and integer OAM, and achieves a mode isolation of ≥5dB through a dual isolation mechanism of phase conjugate demodulation and spatial optimal focusing. This improves fiber coupling efficiency and communication link robustness, significantly expanding the channel capacity and spectral efficiency of free-space optical communication.

A method for phase-conjugate target emulation for testing a DSB FMCW radar includes selecting a proxy transponder from an array of frequency-shifting transponders to transmit an emulated target radar signal to a radar DUT. The proxy transponder is located at a mirror image location with respect to a desired DoA of a signal from an emulated radar target. The method further includes receiving a radar signal from the radar DUT and generating an output signal to be transmitted by the proxy transponder to the radar DUT by swapping roles of a normal sideband component and a ghost sideband component of the output signal such that the ghost sideband component appears to the radar DUT as a desired emulant and the normal sideband component appears to the radar DUT an undesired ghost sideband component. The method further includes transmitting the output signal to the radar DUT.

The present application relates to the technical field of optical element surface physical property testing, and discloses a structured light testing system for optical element surface patterns, which comprises: a pair of phase conjugate structured light fields for alternately illuminating the optical element, synchronous acquisition of Fourier domain diffraction patterns and spatial domain in-situ light field intensity distribution, and calculation of a differential signal to determine a defect position after correction of the diffraction patterns by the in-situ light field intensity distribution. The present application presets a common mode signal cancellation mechanism for defect-free periodic patterns at the physical layer level through conjugate illumination and differential processing, thereby suppressing a large amount of redundant information and retaining and highlighting only the asymmetric scattering signal caused by defects, which makes the focus of detection shift from the accuracy of measuring geometric morphology to the uniformity of distinguishing the physical properties of material optical response, and realizes high signal-to-noise ratio rapid discrimination of functional defects.

This invention relates to an anti-interference data transmission method for a 10kV faulted high-voltage line, belonging to the field of signal transmission technology. The method includes: acquiring fault data and subcarriers; inputting the fault data into a fault-channel cooperative sensing model, outputting fault type and channel state information; performing hierarchical coding based on the fault type and channel state information to obtain hierarchical error correction coding; generating an anti-phase interference cancellation signal using a phase conjugate cooperative arc interference cancellation unit, and aggregating subcarriers to obtain aggregated subcarriers; mapping the hierarchical error correction coding to the aggregated subcarriers to obtain a modulated signal; superimposing the anti-phase interference cancellation signal and the modulated signal to achieve initial interference cancellation, obtaining a mixed signal; performing signal compensation using a multi-source power supply relay unit; performing secondary interference cancellation on the compensated mixed signal; and demodulating and decoding the signal after secondary interference cancellation to restore the fault data, thus completing the fault data transmission.

Provided is an optical transmission system including: a phase conjugate conversion device that performs optical parametric amplification, monitors power of a first polarization component and a second polarization component of first pilot light, synchronizes phases of harmonics and the first pilot light by controlling a phase of pump light to cause each optical power of the first pilot light to be maximum, and matches optical lengths of paths of a first optical parametric amplification unit and a second optical parametric amplification unit by controlling a transfer device arranged in at least one of the paths to cause an interference waveform of components of second pilot light to be maximum when the second pilot light is caused to pass in a second direction, the second pilot light having at least a wavelength or optical power different from that of the first pilot light; and a phase-sensitive amplification device that performs phase-sensitive amplification of an optical signal included in an optical transmission signal and idler light by optical parametric amplification using the pump light controlled by using the first pilot light included in the optical transmission signal.

The application belongs to the field of optical fiber communication, and discloses a dispersion simulation transmission link and a dispersion simulation method based on analog signal processing. The dispersion simulation transmission link comprises a coherent transmitter, an IQ modulator, lasers with different wavelengths, an interference receiving chip (ICR), a Bragg dispersion compensation grating (FBG-DCM) and a coherent receiver. Data is sent from the coherent transmitter, first passes through the ICR to convert the optical field into the electrical domain, and is modulated into a new optical field by the IQ modulator. The output end of the ICR has two optional paths. The first path is connected to the IQ modulator, uses the secondary emission of intrinsic light with different wavelengths, and converts the wavelength to the FBG-DCM compensation window. After the above steps, the original wavelength is converted by the IQ modulator after being received by the ICR for transmission, so that the superposition of negative dispersion is realized. The second path is connected to the IQ modulator, uses the secondary emission of intrinsic light with different wavelengths, realizes the phase conjugation and converts to the FBG-DCM compensation window at the same time. After the above steps, the ICR receives and realizes the superposition of positive dispersion.

This invention discloses a two-dimensional beam scanning system and method based on a dual off-axis geometric phase lens group. Utilizing the principle of geometric phase, this invention designs an off-axis phase distribution on the lens surface, causing the pointing angle of the outgoing beam to deflect after the incident parallel beam passes through two independently rotating lenses at different speeds. The first lens focuses and deflects the incident circularly polarized light, resulting in orthogonally circularly polarized light. The second lens, through a specific phase conjugation design, continues to focus and deflect the orthogonally circularly polarized light using a positive lens. Through the independent differential rotation of the two off-axis positive lenses, high-speed two-dimensional scanning of various trajectories such as spirals, rose lines, and circles is achieved on the focal plane using the principle of vector synthesis. This invention employs a compact system and method with higher light energy utilization, and is free from the inertial limitations of mechanical galvanometers, making it particularly suitable for fields such as lidar, laser rotary cutting, and free-space optical communication.

The application discloses a kind of RFIDs echo directional labels including first antenna unit, second antenna unit, six-port coupler, double-differential RFID chip and differential impedance matching component, the first single-end port and the second single-end port of six-port coupler are connected with first antenna unit and second antenna unit respectively, first differential port group and second differential port group are connected with the first differential radio frequency port and the second differential radio frequency port of double-differential RFID chip respectively via differential impedance matching component, the six-port coupler and differential impedance matching component are symmetrically arranged on two differential branches with same circuit topology and corresponding port connection relationship, so that the echo component generated by double-differential RFID chip load modulation satisfies phase conjugate relationship at two antenna ports, thereby forming directional return to wave direction.This label can work without changing existing ultra-high frequency RFID reader hardware and communication protocol.

This invention discloses a method and system for acoustic fire extinguishing using a mobile robot to dynamically control the standing wave field. It relates to the field of acoustic fire extinguishing technology. The acoustic objective function constructed in this invention essentially seeks the physical path with the highest energy transmission efficiency. The acoustic wave follows physical laws to compensate for amplitude attenuation and phase distortion along the propagation path, achieving phase conjugate focusing at the fire source based on physical laws. This allows the acoustic focusing to jump from geometric superposition to phase conjugate focusing based on physical laws, increasing the acoustic particle velocity at the fire source. Furthermore, the synthesized acoustic vortex field forms a "ring-shaped vortex structure" around the fire source, generating a strong shearing and tearing effect and circulation on the flame front. Ultimately, by increasing the acoustic particle velocity at the fire source, the acoustic energy is efficiently, accurately, and adaptively delivered to the core area of ​​the fire source in the form of a "ring-shaped vortex structure," achieving highly efficient fire extinguishing of dynamically spreading flames.