71 results about "Mode transformation" patented technology

The invention provides a fault positioning method and system for an overhead line of a power distribution network, and a storage medium. The method comprises the steps of obtaining a plurality of fault traveling wave magnetic field signals; performing the following steps on any signal: performing phase-mode transformation on the signal, extracting and decomposing a line mode component, determining a modulus maximum point, and determining the time corresponding to the point as a first fault traveling wave head arrival moment; carrying out clock synchronization on the moment, and obtaining a wave head arrival moment of a second fault traveling wave; obtaining a to-be-detected fault point and a line parameter; based on the wave head arrival moments of the plurality of second fault traveling waves, extracting a head end arrival moment and a tail end arrival moment; and performing fault positioning on the overhead line of the power distribution network based on the head end arrival time, the tail end arrival time and the fault line parameters. According to the fault positioning method for the overhead line of the power distribution network, interference to normal operation of the power distribution network can be avoided, and high-precision non-intrusive positioning of the overhead line of the power distribution network is realized through the tunneling magnetoresistive sensor.

The invention relates to the technical field of precision optical control, in particular to a sum-difference mode cooperative control double-actuator visual axis stable imaging method and system, and the method comprises the steps: calculating a sum mode variable and a difference mode variable between the angular velocity information of a first actuator and the angular velocity information of a second actuator; performing inverse mode transformation on the two mode variables to obtain independent control commands for respectively controlling the first actuator and the second actuator; the two independent control commands are correspondingly input into the first actuator and the second actuator after being processed through a control algorithm based on data driving. The ultra-high precision of the two actuators is effectively combined, stable control over the optical axis of the optical imaging system is achieved, and the imaging definition and stability of the optical imaging system in the disturbance environment are remarkably improved.

The invention provides a fault position calibration method and system for a flexible DC four-end looped network, and the method comprises the steps: collecting an original voltage traveling wave signal of a fault voltage traveling wave, and carrying out the preprocessing of the original traveling wave signal; performing polarity separation on the preprocessed original traveling wave signal, and performing phase-mode transformation on the original traveling wave signal after polarity separation; carrying out wave head identification on the original traveling wave signal after phase-mode transformation, and judging a path through which each wave head passes; selecting a preset number of wave heads from each wave head, and determining a calculation expression of the preset number of wave heads; and calculating a plurality of different distance measurement results according to the calculation expression of the preset number of wave heads, carrying out weighted average on the plurality of different distance measurement results, and calibrating the initial distance measurement result to obtain the position of the fault point. According to the invention, the position of the fault point can be accurately determined, so that the position of the fault point of the flexible direct-current four-end looped network can be quickly and accurately found out.

The invention discloses a spiral structure waveguide for vortex light topological charge conversion and an implementation method thereof, and belongs to the field of optical waveguides. The circular waveguide and the spiral structure are combined, the spiral structure is used for regulating and controlling the vortex light mode according to the mode conversion matching condition, and vortex light conversion between any topological charge orders is achieved; according to the invention, complete conversion between different vortex lights is realized, two vortex light mixed beams with different proportions can be generated, and the requirements of generation and utilization of vortex lights with different orders in an integrated photonics on-chip structure are met. According to the method, the problem that topological charges cannot be freely converted among different vortex light modes in a waveguide structure is solved, the application value of the waveguide structure in the aspect of vortex light regulation and control is expanded, and the possibility is provided for an integrated photon platform to utilize vortex light topological charge degree-of-freedom coding information and process calculation tasks. According to the invention, information coding, optical communication, calculation and other applications are carried out by changing the topological charge of the vortex light.

The invention refers to a method for coupling of waveguides, providing simultaneous interfacing and polarization and mode conversion between waveguides supporting modes and polarization states with similar or substantially different characteristics, and to a chip (100) comprising a converter structure, and to such converter structure. The invention merges functionalities of mode spot size conversion, mode coupling and transfer, mode type conversion, polarization conversion and polarization splitting. The converter structure is based on vertically stacked waveguides forming a vertical directional coupler (1) connected with different polarization branches (8) integrated into the chip (100).

The application provides a method, device and system for light field vector mode conversion, the method comprising: acquiring a cylindrical vector beam field, a fundamental mode Gaussian light array field and a first geometric phase multi-plane light transformation field; determining a first light field and a second light field based on the cylindrical vector beam field, the fundamental mode Gaussian light array field and the first geometric phase multi-plane light transformation field; acquiring a second geometric phase corresponding to a preset condition based on a difference between orthogonal basis vectors of the first geometric phase, the first light field and the second light field and the preset condition; determining a second geometric phase multi-plane light transformation field by using a vector wavefront matching mode based on the second geometric phase; and converting the fundamental mode Gaussian light array field and the cylindrical vector beam field based on the second geometric phase multi-plane light transformation field, thereby realizing multiplexing and demultiplexing of the cylindrical vector beam field, greatly improving the channel capacity of the optical fiber and improving the transmission efficiency of the optical fiber communication.

A device includes a first mode converter and a second mode converter that define a region between the first mode converter and the second mode converter. The region can contain a plurality of optical modes including at least three modes. The first mode converter and the second mode converter can generate a near-field via a conversion between the plurality of optical modes. The first mode converter can receive an input wave of a first mode and the second mode converter can generate an output wave of a second mode different from the first mode. The first mode converter and the second mode converter can generate a confined near-field via a conversion between the plurality of optical modes.

The application discloses a driving mode control method, a motor driving method and system, and a photographing module. The driving mode control method comprises the following steps: acquiring a first starting time of a signal synchronization process of the photographing module in a photographing process, a second starting time corresponding to an analog-digital conversion process, and a switching time of switching from a first mode to a second mode; acquiring a first difference t1 between the first starting time and the second starting time; acquiring a second difference t2 between the switching time and the second starting time; calculating a delay time according to at least one parameter in a mode conversion period of the analog-digital conversion process, the first difference t1 and the second difference t2, wherein the delay time is used for delaying a mode switching operation, and the analog-digital conversion process is avoided from the second mode; and switching from the second mode to the first mode by taking the delay time as a reference after detecting a synchronization signal. The application can improve the quality of a photographed image.

The application discloses a collaborative protection control method and system for a light storage and charging integrated system. The method comprises the following steps: generating an injection control instruction and sending the injection control instruction to a harmonic feature injection module to perform harmonic injection; continuously collecting impedance monitoring data in an interval time and generating impedance reference data; then, detecting whether the newly collected impedance monitoring data deviates from the impedance reference data according to an island detection rule; if the newly collected impedance monitoring data deviates from the impedance reference data, sending a signal blocking instruction and a shutdown instruction to a bidirectional grid-connected converter; sending a mode conversion instruction to the bidirectional grid-connected converter to switch to a network construction type working mode and monitoring the impedance monitoring data to determine whether a touch risk occurs; if the touch risk occurs, sending a low-power operation instruction to the bidirectional grid-connected converter and issuing a warning information. The above method realizes island detection and touch protection through a harmonic feature injection mode, and improves the reliability of collaborative protection control of the light storage and charging integrated system.

The invention discloses a high-energy pulse column vector fiber laser, which comprises a gain switch pulse seed source, a pre-amplification unit, a mode conversion unit and a main amplification unit which are arranged in sequence, wherein the pre-amplification unit comprises a pre-amplification beam combiner and a pre-amplification double-cladding gain optical fiber which are arranged in sequence, and the pumping end of the pre-amplification beam combiner is connected with a pre-amplification pumping source; the mode conversion unit comprises a mode converter and a polarization controller which are arranged in sequence; the main amplification unit comprises a beam splitter, a plurality of paths of main amplification channels and an optical fiber coupler which are arranged in sequence; wherein each main amplification channel comprises a main amplification beam combiner, a main amplification double-cladding gain optical fiber and a phase delayer which are arranged in sequence, and the pumping end of the main amplification beam combiner is connected with a main amplification pumping source. The pulse column vector fiber laser is combined with a column vector light mode converter and a fiber amplification structure outside a cavity, and high-quality, high-stability and adjustable-repetition-frequency high-power pulse column vector fiber laser output is obtained.

The application provides a display panel and a display device, wherein the time length of the bias adjustment stage and the time length of the non-emitting stage are set to be non-same ratio change, when the display panel is converted from a first mode to a second mode based on the change requirement of brightness, the time length of the non-emitting stage is in a state of being shortened, at this time, the time length of the bias adjustment stage is adjusted in a W1 / L1W2 / L2 mode, so that the change amplitude of the time length of the bias adjustment stage caused by the mode change of the working state is relatively small; that is, the time length of the bias adjustment stage in the second mode is relatively large, and the phenomenon of flicker of the display panel during the mode adjustment in the second mode is avoided. Therefore, the technical scheme provided by the application improves the flicker problem of the display panel under different brightness modes, and ensures that the display device has good display effect.

The invention relates to the field of silicon-based optoelectronic integration, and particularly discloses an on-chip adaptive wave combination method and feedback system for a polarization diversity MZM, and the system comprises an optical coupling and mode conversion module, a polarization diversity electro-optical modulation module, an optical power collection and photoelectric conversion module, a signal processing and feedback control module, and a tunable wave combination module. After coupling conversion and modulation, two paths of optical power are collected and subjected to photoelectric conversion, a power difference voltage is obtained through an analog circuit, a bias voltage is superposed to generate a control voltage, and an adjustable combiner is driven to dynamically adjust the beam splitting ratio to complete wave combination. The problems that the output power of the polarization diversity MZM fluctuates randomly along with the polarization state, and an existing polarization control scheme is slow in response, complex in architecture and difficult to integrate with a silicon-based process are solved, real-time accurate compensation of power fluctuation is achieved, it is guaranteed that the combined wave output power is stable, the system architecture is simple, power consumption is low, integration with a silicon-based chip monolithic chip is easy, and the application range is wide. And the performance and the compatibility of the integrated photonic link are improved.

This invention provides a method and system for realizing millimeter-wave ring beams, belonging to the field of millimeter-wave transmission and near-field beamforming technology. It solves the problem in existing technologies that there is no research on the feasibility and implementation method of ring beams to improve the power capacity of the dielectric window. The method includes: S1, constructing a phase correction model for the ring beam realization system; S2, based on the phase correction model, performing a mirror design process for the two sets of reflectors in the ring beam realization system; S3, after completing the mirror design process, obtaining a first set of reflectors and a second set of reflectors; S4, arranging the first set of reflectors and the second set of reflectors in the system, placing the dielectric window between the first set of reflectors and the second set of reflectors, and realizing a millimeter-wave ring beam at the dielectric window by mode transformation of the electromagnetic wave beam through the reflector sets. This invention reduces the peak field strength and maximum temperature rise while maintaining existing hardware costs, significantly increasing the transmission power at the dielectric window.

The invention relates to an optical processing device (DR) for optically processing an incident light beam (I0) which has propagated through a free space and whose phase front is susceptible to distortion. The optical processing device (DR) comprises: mode conversion means (M) configured to break down at least a portion of the incident light beam (I0) into at least two elementary light beams (to); and an integrated photonic device (C) configured to coherently recombine the at least two elementary beams (to) and to produce at least one recombined beam () on the output optical port (P2). The basic light beam (arrival) propagates between the input optical port (P1) and the output optical port (P2) along at least two separate optical paths, respectively. The optical processing device (DR) is characterized in that at least one of the optical paths comprises at least one static delay element (D1, D2, D3) configured to equalize the propagation time of the elementary optical radiation along the optical path.

This invention discloses a high-precision ranging method and system for time-refined DC back-traveling waves, belonging to the field of power system fault location technology. The method includes: acquiring signals and performing mode transformation to extract first-mode voltage and current signals; establishing a time-domain expression for the back-traveling wave; performing wavelet denoising on the signals to extract the first-mode DC voltage signal; reconstructing the time scale in the time-refined model; performing variational mode decomposition and Hilbert transform to obtain instantaneous amplitude and instantaneous energy sequences, constructing an energy kurtosis index, detecting sudden increases in energy kurtosis, and identifying the arrival time of the first DC back-traveling wavefront generated by the fault; calculating the wavefront arrival time difference based on the arrival times of the first DC back-traveling wavefront measured at both ends of the DC line, and determining the location of the fault point by combining the DC line length and traveling wave propagation characteristics. This invention has low dependence on traveling wave propagation parameters, provides reliable ranging results, and is applicable to deep-sea offshore wind power flexible DC systems.

This application discloses a method and device for measuring parameters of a double-circuit transmission line. It involves periodically acquiring voltage and current signals from the beginning and end of each phase of the double-circuit transmission line. Two sets of voltage moduli and two sets of current moduli are generated based on the voltage and current signals. The resistance and inductance moduli are calculated from the first set of moduli, and then inverse phase-mode transformation is performed to obtain the resistance and inductance phase parameters. A phase sequence transformation is then performed to obtain the positive-sequence self-impedance, zero-sequence self-impedance, and zero-sequence mutual impedance of the double-circuit transmission line. Similarly, the capacitance moduli of the double-circuit transmission line are calculated from the second set of moduli, and then inverse phase-mode transformation is performed to obtain the capacitance phase parameters. A phase sequence transformation is then performed to obtain the positive-sequence self-capacitance, zero-sequence self-capacitance, and zero-sequence mutual capacitance of the double-circuit transmission line. This method enables simultaneous measurement of positive-sequence impedance and zero-sequence impedance and capacitive reactance parameters of the line without power outages or changes to the transmission line's operating mode. It offers high measurement accuracy and is simple and cost-effective.

The invention discloses a fault positioning method and system for a low-frequency transmission line of a flexible frequency-division power transmission system, and relates to the field of fault positioning of the flexible frequency-division power transmission system. According to the method, ICEEMDAN after SCSSA parameter optimization is utilized to decompose 1-mode voltage components of voltage traveling wave signals, subjected to phase-mode transformation, on the two sides of a line, and IMF spectrum components are obtained. And selecting the highest-frequency IMF component, enhancing the wave head mutation characteristic by adopting NTEO, realizing accurate calibration of the moment when the traveling wave arrives at the traveling wave head and arrives at the measurement position, and calculating the distance from the fault point to the installation position of the traveling wave positioning device by combining the time when the forward traveling wave and the reverse traveling wave arrive at the measurement device for the first time and the traveling wave speed. The method fills the blank of fault positioning of the low-frequency transmission line of the flexible frequency division power transmission system, is not influenced by fault distance, fault type, system noise and the like, realizes relatively accurate positioning of the fault position of the low-frequency transmission line of the flexible frequency division power transmission system, and has good engineering value.

The application provides a display panel and a display device, wherein the time length of the bias adjustment stage and the time length of the non-emitting stage are set to be non-same ratio change, when the display panel is converted from a first mode to a second mode based on the change requirement of brightness, the time length of the non-emitting stage is in a state of being shortened, at this time, the time length of the bias adjustment stage is adjusted in a W1 / L1W2 / L2 mode, so that the change amplitude of the time length of the bias adjustment stage caused by the mode change of the working state is relatively small; that is, the time length of the bias adjustment stage in the second mode is relatively large, and the phenomenon of flicker of the display panel during the mode adjustment in the second mode is avoided. Therefore, the technical scheme provided by the application improves the flicker problem of the display panel under different brightness modes, and ensures that the display device has good display effect.

According to the present disclosure, it is possible to reduce the difference in mode conversion efficiency occurring between degenerate modes of propagation in an optical fiber.　A mode converter (10) according to the present disclosure is provided with: a cladding (11); and, in the cladding, a core (12) that has a refractive index greater than the refractive index of the cladding, and a plurality of refractive index modulation portions (13A, 13B) that are provided so as to obliquely intersect the core and have a refractive index different from that of the surroundings. The mutually different refractive index modulation portions (13A, 13B) intersect the core (12) in mutually different directions in a cross section orthogonal to the longitudinal direction of the core.

The invention relates to the technical field of photon integration and mode multiplexing, in particular to a multi-core optical fiber mode converter based on a three-dimensional structure and a preparation method. Comprising an input waveguide, a beam splitter, a phase shifter, a three-dimensional mode conversion waveguide and an output waveguide which are connected in sequence, light fields of a plurality of channels are input to the three-dimensional mode conversion waveguide, and are mutually interfered and coupled in a three-dimensional space of the three-dimensional mode conversion waveguide, including mode superposition in a transverse direction and coupling in a longitudinal direction, so as to realize multi-mode coherent multiplexing, wave division and mode reconstruction; the three-dimensional optical design degree of freedom is introduced, so that mode interference and energy distribution can be regulated and controlled in the transverse direction and can also be flexibly controlled in the longitudinal direction, and therefore more efficient mode coupling and polarization independent characteristics are achieved. By means of the three-dimensional input and output structure of the multi-core optical fiber, the device can achieve higher integration density and channel capacity in a limited volume, and the mode multiplexing efficiency and the system expansibility are greatly improved.

The invention belongs to the technical field of integrated photoelectronics, and particularly relates to an optical waveguide optimization design method based on an equivalent adiabatic degree criterion and an optical waveguide. The method comprises the following steps: step 1, initial setting and MCTE curve acquisition; 2, defining a globally unified equivalent adiabatic factor (EAF); 3, based on an EAF criterion, iteratively correcting width division; and 4, iterative convergence is carried out, and a final structure is determined. The optical waveguide is formed by connecting N sections in series, and the combination of the width difference delta W and the length L of each section accurately enables the mode conversion performance index of each section to fall on the same preset equivalent adiabatic factor (EAF) working point located in a non-oscillation area of an MCTE curve.

The application provides a chip-on nonlinear amplification gain waveguide structure, which comprises, in sequence, an input waveguide, a first mode converter, a second mode converter, a nonlinear waveguide, a third mode converter and a fourth mode converter; a first signal light is input from the input waveguide to the fourth mode converter, is converted and output as a second signal light by the fourth mode converter, is input from the fourth mode converter to the first mode converter, is converted and output as a third signal light by the second mode converter, is input from the second mode converter to the third mode converter, and is converted and output to an output waveguide by the third mode converter. The application adopts a mode circulation type nonlinear gain amplification waveguide structure composed of multiple mode conversion devices, improves the space utilization of the chip-on waveguide, increases the action length of the optical field and the waveguide, thereby improving the generation efficiency of the nonlinear effect in a unit area, and realizing the effect of amplification gain.

Provided is an optical signal processing device (400) comprising: an optical merging unit (201) that includes an optical merger (212) that converts the mode of light beam of one input signal among two input signals into a mode orthogonal to the mode of light beam of the other input signal, and merges the one light beam with the other light beam; and an optical mode conversion unit that converts only one of the two light beams having the mutually orthogonal modes and inputted from the optical merging unit into a mode different from the mode of the light beam of the other input signal and the orthogonal mode, and is composed of a tapered waveguide (402) having a waveguide width that changes along the traveling direction of the light beams. The tapered waveguide of the optical mode conversion unit includes at least two tapered sections having different rates of change of the waveguide width along the traveling direction of the light beams.

The application provides a fault position calibration method and system for a flexible DC four-terminal loop network, which comprises the following steps: collecting original voltage traveling wave signals of a fault voltage traveling wave, and preprocessing the original traveling wave signals; performing polarity separation on the preprocessed original traveling wave signals, and performing phase-mode transformation on the polarity-separated original traveling wave signals; identifying wave heads of the phase-mode-transformed original traveling wave signals, and judging paths passed by each wave head; selecting a preset number of wave heads from each wave head, and determining calculation expressions of the preset number of wave heads; calculating a plurality of different ranging results according to the calculation expressions of the preset number of wave heads, performing weighted average on the plurality of different ranging results, and calibrating an initial ranging result to obtain the position of a fault point. The application can accurately determine the position of the fault point, and thus can quickly and accurately find the position of the fault point of the flexible DC four-terminal loop network.

This application relates to the field of wave energy simulation technology and discloses a simulation method and system for dual-mode frequency tuning of oscillating water columns in a double-slit caisson. The method includes: establishing a two-degree-of-freedom dynamic equation system based on the displacements of the water columns in the front and rear cavities, using the slit transmission coefficient as a parameter to obtain the coupling stiffness; substituting the coupling stiffness into the eigenvalue equation to decompose the oscillation modes of the two cavities to obtain the mode transformation matrix and mode amplitude ratio; performing convolution integration on the mode amplitude ratio and the wave power spectrum of the target sea area to obtain the first-order mode weight and second-order mode weight; using a preset target first-order mode weight as the outer convergence target and a preset target natural frequency as the inner convergence constraint to perform a double-layer nested iterative solution on the slit transmission coefficient and the rear cavity volume to obtain the optimal slit width and the optimal rear cavity volume. This application solves the problem of unobservable and undesignable energy contribution ratios of each mode in existing technologies, leading to spectral mismatch.

A display apparatus can include a timing controller, a level shifter including a signal input circuit that receives a first clock signal and a second clock signal, a driving mode conversion circuit that generates one or more mode signals for adjusting a driving mode based on the first clock signal and the second clock signal by itself, a signal output circuit that generates a plurality of scan clock signals based on the one or more mode signals, the first clock signal, and the second clock signal, a shift register configured to generate a scan signal based on the plurality of scan clock signals, and a display panel configured to display an image based on the scan signal. Furthermore, the level shifter is configured to sequentially output a pulse for each of the plurality of scan clock signals in response to a pulse width of the first clock signal being greater than a threshold value.

The present application relates to the technical field of precision optical control, and particularly relates to a dual-actuator boresight stable imaging method and system with sum and difference mode cooperative control, wherein a sum mode variable and a difference mode variable between angular velocity information of a first actuator and a second actuator are calculated; inverse mode transformation is performed on the two mode variables to obtain independent control commands for controlling the first actuator and the second actuator respectively; and the two independent control commands are input into the first actuator and the second actuator after being processed by a data-driven control algorithm. The present application effectively combines the ultra-high precision of the two actuators, realizes boresight stable control of an optical imaging system, and significantly improves the imaging clarity and stability of the optical imaging system in a disturbance environment.

An optical arrangement includes an optical printed circuit board (OPCB) having at least a first optical waveguide having a first end located on the OPCB. The optical arrangement also includes at least one photonic integrated circuit (PIC) mounted to the OPCB. The PIC includes a second optical waveguide. The first waveguide has a second end located on a portion of the second waveguide to optically couple light between the PIC and the first waveguide. The portion of the second waveguide on which the second end of the first waveguide is located has an inverse taper. The inverse tapered portion is defined by a plurality of segments. The segments of the inverse tapered portion each have a length and a taper rate that causes each segment to make an equal contribution to any radiation losses in the mode transformation of light being coupled between the first and second waveguides.

Methods, systems, computer-readable media, devices, and apparatuses for synchronous mode transitions are presented. A first device configured to be worn at an ear includes a processor configured to generate an audio signal based on audio data in a first context mode. The processor is further configured to exchange, in the first context mode, a time indication of the first time with the second device. The processor is further configured to transition from the first context mode to the second context mode at a first time based on the time indication.

The invention discloses a modularized high-power continuous column vector fiber laser which comprises a seed source module, a mode selection module, a polarization phase compensation module, an isolator and a first amplifier module in sequence. The seed source module is configured to output seed light, and the seed light is LP01 fundamental mode light; the mode selection module is configured to convert the mode of the seed light into column vector light; the polarization phase compensation module is configured to adjust the phase relation of two orthogonal polarization components in the column vector light to a target phase relation; the isolator is configured to block a light path before the backward reflected light is reflected into the isolator; the first amplifier module is configured to amplify the optical power output by the isolator. According to the invention, the mode coupling / conversion device is removed from the sensitive laser resonant cavity and is arranged in the independent module outside the resonant cavity, so that each module can work independently, the mutual restriction of the work of each device in the laser is reduced, and the influence of environmental disturbance is reduced. The converter outside the resonant cavity can bear higher power, so that power extension and system architecture flexibility of the laser are facilitated.