42 results about "Phase tuning" patented technology

The invention discloses a DP-MZM-based reconfigurable mixer with phase shift and image rejection functions, and belongs to the field of microwave photon signal processing. By adjusting an input radio frequency signal and a direct current bias voltage of the DP-MZM1, four different LO frequency doubling and mixing functions can be realized. By controlling the angle alpha between the polarization direction of the polarization analyzer and one axis of the modulator, the phase of the generated signal can be flexibly tuned in the range of 0-360 degrees. When combined with the optical frequency comb, the multi-channel multi-band frequency conversion system can be expanded into a multi-channel multi-band frequency conversion system with independent phase tuning capability by utilizing the channel switching and frequency slot selection functions of the wavelength selection switch, and parallel output of various frequency mixing results can be realized. By adjusting the phase difference between the two-channel output signals, I / Q mixing, double-balanced mixing and image rejection mixing can be configured. The scheme is not influenced by direct current bias drift, the system complexity is reduced, and the frequency conversion efficiency is improved.

The invention provides an all-polarization-maintaining optical fiber mode-locked laser which comprises a linear cavity and an annular cavity. Wherein the annular cavity consists of a wavelength division multiplexer, an optical fiber coupler, a phase bias device, a gain optical fiber and a dispersion compensation optical fiber; the linear cavity is composed of an optical fiber coupler and an optical fiber reflector. As a function multiplexing device, an external electric field is applied to the phase bias device, so that the functions of continuous tuning of the phase difference in the positive direction and the negative direction in the annular cavity of the 9-shaped cavity mode-locked fiber laser and rapid phase tuning are realized, and the realization of a mode-locked state and a high-precision phase locking state is promoted. In addition, the composition structure of the resonant cavity can be simplified, and the repetition frequency and the system stability of the mode-locked laser can be improved. The technology for constructing the 9-shaped cavity mode-locked fiber laser by adopting the active phase bias device has originality in the field of ultrafast optics, and a better choice is provided for the all-polarization-maintaining fiber mode-locked laser.

The invention discloses a fractional frequency division frequency synthesizer with output signal phase synchronization and frequency modulation continuous wave functions, and the basic structure is a charge pump phase-locked loop. Comprising a phase frequency detector, a first charge pump, a second charge pump, a low-pass filter, a voltage-controlled oscillator, a first buffer, a second buffer, a two-frequency divider chain, an IQ undersampling circuit, a local oscillator generator, a programmable multimode frequency divider, a Delta-Sigma modulator (DSM), a first selector, a second selector, a third selector, a tracking phase accumulator, a numerical control oscillator, an accumulation phase difference register and an atan2 logic circuit. The device comprises a main phase control circuit, a phase adjusting circuit, an enabling control circuit, a waveform generator and a serial peripheral interface. The decimal frequency-division frequency synthesizer can be applied to a general-inductance integrated system, ensures that output signals provided by a plurality of decimal frequency-division frequency synthesizers are consistent in phase in a multi-channel radio frequency transceiving system adopting a multi-chip splicing mode, and can also be applied to the general-inductance integrated system as a sensing signal source; and the speed and the distance of an object can be quickly sensed by the high linearity and the quick chirp capability of an output signal. The decimal frequency division frequency synthesizer is applied to a linear frequency modulation continuous wave radar system, initial phase synchronization can be carried out firstly, then frequency continuous modulation is carried out, and measurement errors can be eliminated. In view of functional similarity of partial modules of the synchronous loop and the FMCW loop, such as a phase frequency detector, a charge pump, a voltage-controlled oscillator and the like, the modules can be shared, so that the power consumption and area cost of the system are remarkably reduced.

A method and device for outputting frequency multiplication signal having high harmonic suppression, and a storage medium. The method includes: obtaining initial signal; inputting the initial signal into target circuit, where the target circuit includes parallel circuit, first circuit of the parallel circuit is provided with frequency multiplier, second circuit of the parallel circuit is provided with phase adjustment module, the first circuit is connected to input end and output ends of the target circuit, the second circuit is disconnected from the input end and the output end, the phase adjustment module is configured to adjust a phase of the second circuit to a target phase, and phase difference between the target phase and a first phase of the first circuit is greater than 90 degrees; taking a target signal output from the target circuit as frequency multiplication signal of the initial signal.

Interstitial uptake of a metal alloy is leveraged to either stabilize low-temperature miscibility gaps or promote new miscibility gaps with respect to the interstitial elements at temperatures above the native metal interstitial-free alloy miscibility gap. The miscibility gap pathway offers selective precipitation at the surface while maintaining base alloy properties throughout the bulk of an article or component. Interstitially-induced separated phases offer even higher control over the interdiffusion between the metal alloy and a coating, which will expand the number of compatible coatings for a given alloy, increasing the potential performance of the alloy in harsh environments.

The application discloses a one-dimensional phase scanning waveguide slot antenna array based on an adjustable reflective phase shifter, wherein a TE10 mode signal is converted into four equal-amplitude and in-phase TEM mode signals by a one-to-four coaxial feeding layer and transmitted to an adjustable reflective phase shifter group, the adjustable reflective phase shifter group adjusts the phases of the four TEM mode signals, generates four TEM mode signals and transmits the four TEM mode signals to a double-ridge-to-coaxial layer, the double-ridge-to-coaxial layer converts the four TEM mode signals into four TE10 mode signals through a coaxial-to-double-ridge structure and outputs the four TE10 mode signals to a single-ridge waveguide transmission layer, the single-ridge waveguide transmission layer transmits the four TE10 mode signals to a slot radiation layer through a double-ridge waveguide-to-single-ridge waveguide structure, the slot radiation layer radiates the four TE10 mode signals to free space, and the slot radiation layer, the single-ridge waveguide transmission layer, the double-ridge-to-coaxial layer, the adjustable reflective phase shifter group and the one-to-four coaxial feeding layer are all made of full metal; the one-dimensional phase scanning waveguide slot antenna array based on the adjustable reflective phase shifter has the advantages of simple structure, low cost, large-angle scanning and high gain.

An optical phase tuning device (1) is provided that comprises a beam splitter (3), a tunable gradient phase shifter (4) and a controller (6) for providing a single drive signal (Iheat) for resistively heating the resistive heating elements. The beam splitter (3) is configured to split a coherent optical beam into a series of individual coherent beams. The tunable gradient phase shifter (4) has a corresponding series of thermo-optical phase shifters (4b, 4c, 4d, 4e), each of which is configured to apply a respective phase shift to a respective one of the individual coherent beams. The thermo-optic phase shifters each comprise a respective resistive heating element (5b, 5c, 5d, 5e) having a mutually different width. The controller (6) provides a single drive signal (Iheat) for resistively heating the resistive heating elements. Therewith a respective phase shift is imposed to each of the individual coherent beams that is substantially inversely proportional to the squared width of the respective resistive heating elements.

The invention provides a wide-spectrum tunable optical mixer, and the mixer comprises an input waveguide which is used for receiving and inputting initial local oscillator light and initial signal light; the light beam splitter is used for splitting the initial local oscillation light into two beams of local oscillation light with equal power and splitting the initial signal light into two beams of signal light with equal power; the waveguide cross structure is used for performing cross transmission on the two beams of local oscillation light and the two beams of signal light; the phase tuning electrode is used for performing phase modulation on a beam of local oscillation light and a beam of optical signal; the wavelength insensitive coupler is used for performing frequency mixing on the local oscillation light subjected to phase modulation and the signal light subjected to phase modulation to output a first optical signal and a second optical signal, and performing frequency mixing on the other beam of local oscillation light and the other beam of optical signal to output a third optical signal and a fourth optical signal, the effective refractive index of a coupling area is modulated through stress regulation of the wavelength insensitive coupler, and wavelength insensitive coupling approximate to 3 dB is formed in the working bandwidth.

The present disclosure relates to hybrid metal-oxide semiconductor capacitors with enhanced phase tuning, the disclosed embodiments improve the efficiency of phase tuning for optical devices such as hybrid semiconductor-on-metal capacitors (MOSCAPs) III-V / Si micro-ring lasers. The present disclosure integrates silicon devices into the waveguide structure of the optical devices disclosed herein, for example, waveguide resistor heaters, waveguide PIN diodes, and waveguide PN diodes. In some examples, these optical devices are MOSCAPs formed by a dielectric layer between two semiconductor layers, which achieve a small phase tuning via plasma dispersion and / or carrier dispersion effects that occur depending on the polarity of the bias voltage. According to the embodiments disclosed herein, the plasma dispersion and / or carrier dispersion effects are enhanced by heating, carrier injection, and / or additional plasma dispersion based on the disclosed silicon devices integrated into the waveguide.

The optical modulator (500) disclosed herein is characterized by comprising: a substrate (1); an optical input section (2) disposed at the end of the substrate (1); a plurality of phase modulators (20) connected to the optical input section (2) via an optical waveguide (10); a plurality of phase adjusters (30, 40) respectively connected to the plurality of phase modulators (20) via the optical waveguide (10); an optical output section (3) disposed at the end of the substrate (1) for emitting light output from the plurality of phase adjusters (30, 40) to the outside; a plurality of signal electrode pads (50) disposed along the end of the substrate (1); and a signal wiring (60) electrically connecting the plurality of signal electrode pads (50) to the phase adjusters (30, 40) and having a cross section (70) intersecting with the optical waveguide (10), wherein a conductive layer (110) and a conductive layer (200) for the signal wiring intersect via a buried layer (210) in the cross section (70).

This invention discloses a method for predicting and avoiding the phase tuning of self-excited vibrations in rotating machinery based on the principle of symmetry. The method includes: considering the rotating machinery as a rotating mechanism formed by several coaxially mounted central components and several intermediate force-transmitting components mounted circumferentially; calculating the spatiotemporal excitation phase of each intermediate component based on the spatial rotational symmetry of the topological structure and the time-translational symmetry of the time-varying excitation; providing a Fourier series characterization of the time-varying excitation at each intermediate component based on symmetry; considering the elastic out-of-plane vibration of the central component, calculating the out-of-plane component of the time-varying excitation, and calculating the resultant force and resultant moment in the six degrees of freedom directions using the superposition principle; analyzing the value characteristics of the resultant force and resultant moment using the properties of trigonometric functions, and predicting the typical self-excited vibration modes of the central component. This invention provides technical support for the cancellation of time-varying self-excited forces, prediction of vibration behavior, and parameter selection in rotating machinery. This technology has significant advantages such as accuracy, universality, and high efficiency.

The instant disclosure is directed toward integrated-optics-based composite phase controllers that include at least one thermo-optic (TO) phase controller and at least one stress-optic (SO) phase controller, each of which is configured to affect the phase, or other propagation characteristic, of a light signal travelling through a surface waveguide. The SO phase controller can induce a small phase change quickly, while the TO phase controller can slowly induce a larger phase change. Embodiments are particularly well suited for use in waveguide-based resonant elements, such as ring resonators, spectral filters, and the like. Furthermore, photonic systems comprising one or more composite phase controllers can be developed, such as wavelength-tunable lasers for applications such as LiDAR, chemical / biological sensing, medical diagnostics, and optical communications.

The invention discloses a high-linearity modulator based on multi-waveguide coupling, and belongs to the technical field of semiconductor devices. The high-linearity modulator comprises an optical splitter, a phase tuning unit, a micro-ring coupling waveguide group and a micro-ring modulation unit, and is characterized in that the optical splitter is used for carrying out equal-proportion light splitting on an optical waveguide signal, dividing the optical waveguide signal into N beams of optical waveguide signals and outputting the N beams of optical waveguide signals; the phase tuning unit is used for tuning the phase and amplitude of the N beams of optical waveguide signals by changing the waveguide refractive index and loss; the micro-ring coupling waveguide group outputs a modulated optical signal; and the phase of a micro-ring light field in a ring of the micro-ring modulation unit is changed through electro-optical modulation so as to modulate the signal, and the optical signal with the maximum optical power is used as an output modulation signal of the high-linearity modulator. According to the high-linearity modulator disclosed by the invention, high-order harmonic components are remarkably suppressed while the advantage of small size is maintained, so that the dynamic range of the modulator reaches a high-linearity level.

Systems and methods are provided for generating timing control signals for phase and duty cycle trimming to reduce or eliminate a quadrature error of a clock signal in a memory device. The memory device employs a trim circuit to perform phase tuning to reduce or eliminate the quadrature error. Different phase tuning settings are used by the trim circuit for different types of quadrature errors. The trim circuit adjusts different phases of the clock signal independently or dependently based on the phase tuning settings.

An example method described herein is performed at an illumination system for performing eye-tracking at an AR device. The illumination system includes laser sources, waveguides, phase tuning elements, and emission apertures. The method includes causing emission, via a respective laser source of the one or more laser sources, of laser light. The method includes receiving, via the one or more waveguides, the laser light from the respective laser source, such that the laser light is propagated along a first optical path and a second optical path. The method includes adjusting, via the phase-tuning element, the phase in the first optical path, such that a phase in the first optical path is different than another phase in the second optical path. And the method includes outputting, via at least the first and second emission apertures, respective laser light from the first and second optical paths, to form a fringe illumination pattern.

Described herein is a gradient descent technique for adaptive commutation phase tuning in brushless motors (e.g., such as brushless BLDC motors). In an example embodiment, an integrated circuit (IC) controller for controlling a BLDC motor comprises a first control loop and a second control loop. The first control loop is configured to calculate a duty cycle based on a sensor signal received from a position sensor in the BLDC motor. The second control loop is configured to calculate an updated commutation timing based on a present commutation timing of the BLDC motor and a current measurement representing a current sensed at the BLDC motor. Based on the calculated duty cycle and the updated commutation timing, the IC controller is configured to continuously control commutation in the BLDC motor.

The invention relates to phase and duty cycle trimming for multi-phase clocking. Systems and methods are provided for generating timing control signals tailored for phase and duty cycle to reduce or eliminate quadrature errors of clock signals in memory devices. The memory device employs a trimming circuit to perform phase tuning to reduce or eliminate the quadrature error. The trimming circuit uses different phase tuning settings for different types of quadrature errors. The trimming circuit adjusts different phases of the clock signal independently or dependently based on the phase tuning settings.

The invention discloses a signal purification method and device applied to an optical fiber microwave transmission system, and relates to the technical field of laser frequency stabilization, and the device comprises a single-frequency laser module which is used for obtaining a laser signal with improved stability; the conversion module under the femtosecond optical comb optical frequency is used for acquiring femtosecond pulse laser signals; a photoelectric conversion module; the microwave sensor acquires microwave signals; the microwave frequency synthesis module is used for acquiring a microwave signal for improving the stability; meanwhile, the control module is used for comparing the microwave signal with a preset reference signal, and determining the frequency adjustment amount when the frequency of the microwave signal is deviated from the frequency of the preset reference signal, so as to adjust the frequency of the laser signal for improving the stability in real time; and when the frequency of the microwave signal is consistent with the frequency of the preset reference signal, determining a phase adjustment amount so as to adjust the frequency of the laser signal for improving the stability in real time. The remote transmission requirement of the microwave atomic clock can be met.

The present invention discloses a method for compensating the electrical performance of a high-temperature ablation radome based on array element phase adjustment. Based on data on the temperature distribution of the radome in an operating environment and changes in its material properties with temperature, the portion of the radome whose temperature exceeds the ablation temperature is reconstructed as an air radome when establishing a finite element model of the radome. Full-wave calculations using COMLOL are used to determine the electrical performance of the array antenna after loading the high-temperature ablation radome. The optimal phase distribution of the array antenna within the radome is iteratively solved using a particle swarm optimization algorithm, thereby compensating for the effects of high-temperature ablation on the radome's electrical performance. This method, while ensuring compensation accuracy, takes into account the effects of high-temperature ablation on the radome's electrical performance. The method boasts high compensation effectiveness and accuracy, and is widely applicable.

Methods for providing phonon therapy comprise presenting a subject with a plurality of “yes” or “no” questions relating to the subject's personality and / or lifestyle. Each question is assigned to a frequency of about 256.87 Hz, about 288.33 Hz, about 342.88 Hz, about 384.87 Hz, or about 432 Hz. A frequency score is determined for each frequency as the sum of the “yes” answers to the questions that correspond to that frequency. A predominant resonant frequency is identified as the frequency having the highest frequency score, and the subject is exposed to an audio tone having the predominant resonant frequency. The method may be embodied in a computing device comprising a touchscreen and speaker for displaying the questions, receiving the subject's input answer, determining the subject's predominant resonant frequency, and playing the predominant resonant frequency to the subject.

Systems and methods are provided for optical devices with integrated memristor behavior adapted for non-volatile retention of phase tuning. Examples include an optical filter having a first waveguide formed on a substrate and a phase shift mechanism coupled to the first waveguide. The phase shift mechanism comprises a semiconductor material layer bonded the first waveguide, and a filamentation layer formed between the first waveguide and the semiconductor material based on applying an electric field to the phase shift mechanism. The filamentation layer causes a non-volatile change in a refractive index of the first waveguide, that provides for phase detuning.

It comprises: a substrate; an optical modulator (2) disposed on the substrate; an optical waveguide (3) disposed on the substrate, one end of which is connected to the light emission side of the optical modulator (2), and the other end of which is located at the end of the substrate; a phase adjustment unit (4) disposed on the path of the optical waveguide (3) and adjusting the phase of the guided light in the optical waveguide (3); and an optical amplification unit (5) disposed on the path of the optical waveguide (3) and amplifying the power of the guided light in the optical waveguide (3). Through the phase adjustment of the phase adjustment unit (4), the minimum or maximum value of the transmittance spectrum of the ripples that periodically change with frequency due to multiple reflections of light generated between one end and the other end of the optical waveguide (3) is made to match the wavelength of the light input to the optical modulator (2), thereby minimizing the error vector amplitude.

A high-frequency amplifier includes: an asymmetric Doherty amplifier that amplifies an input high-frequency signal of a wavelength λ, and includes a carrier amplifier and a peaking amplifier that starts an amplification operation when an output of the carrier amplifier reaches a saturation region and has a saturation output different from that of the carrier amplifier; a driver amplifier that drives the asymmetric Doherty amplifier; a branching circuit that branches the high-frequency signal amplified by the driver amplifier into an input path to the peaking amplifier side and an input path to the carrier amplifier side; a phase adjustment circuit that is provided on either of the path to the peaking amplifier side and the path to the carrier amplifier side and delays either of a phase of an input signal of the peaking amplifier and a phase of an input signal of the carrier amplifier; a first substrate on which the carrier amplifier and the peaking amplifier are mounted; and a second substrate on which the driver amplifier, the branching circuit, and the phase adjustment circuit are mounted, wherein, when the second substrate is stacked on the first substrate in an overlapping manner, an input terminal of the driver amplifier and an input terminal of the carrier amplifier are located at positions that project onto each other, and, when n is set to an integer of 0 or more, an electrical length from the input terminal of the driver amplifier to an output terminal of the carrier amplifier is set in such a manner that a phase becomes (2n+1)π.

The application discloses a signal purification method and device applied to an optical fiber microwave transmission system, relates to the technical field of laser frequency stabilization, and comprises the following steps: a single-frequency laser module is used for acquiring a laser signal with improved stability; a conversion module under the optical frequency of a femtosecond optical comb is used for acquiring a femtosecond pulse laser signal; an optoelectronic conversion module is used for acquiring a microwave signal; a microwave frequency synthesis module is used for acquiring a microwave signal with improved stability; meanwhile, the microwave signal is compared with a preset reference signal; when the frequency of the microwave signal is deviated from the frequency of the preset reference signal, a frequency adjustment amount is determined to adjust the frequency of the laser signal with improved stability in real time; and when the frequency of the microwave signal is consistent with the frequency of the preset reference signal, a phase adjustment amount is determined to adjust the frequency of the laser signal with improved stability in real time. The application can meet the demand of remote transmission of a microwave atomic clock.

The invention discloses a dual-polarization time domain modulation reconfigurable electromagnetic metasurface, and belongs to the technical field of microwave device communication. The problem that existing metasurface single polarization regulation has limitation is solved. Two symmetrical split ring structures are etched on the upper surface of the first dielectric layer, a variable capacitance diode is loaded at the midpoint of the two split ring structures, metal strips are arranged on the two opposite sides of each split rectangular ring to achieve connection with adjacent unit structures, the metal strips have the wire function, and the metal strips have the function of conducting wires. The variable capacitance diode is used for being connected with an external voltage source, effective control over the variable capacitance diode can be achieved by adjusting the voltage of an external power source, then continuous regulation and control over equivalent capacitance are achieved, and a wide phase tuning range is obtained. A simulation result shows that the phase regulation and control range of the electromagnetic metasurface can reach 360 degrees within the frequency range of 4-7 GHz and the frequency range of 9-10 GHz; and the amplitudes of the two frequency bands respectively reach 7.5 dB and 10 dB.

Methods for providing phonon therapy comprise presenting a subject with a plurality of “yes” or “no” questions relating to the subject's personality and / or lifestyle. Each question is assigned to a frequency of about 256.87 Hz, about 288.33 Hz, about 342.88 Hz, about 384.87 Hz, or about 432 Hz. A frequency score is determined for each frequency as the sum of the “yes” answers to the questions that correspond to that frequency. A predominant resonant frequency is identified as the frequency having the highest frequency score, and the subject is exposed to an audio tone having the predominant resonant frequency. The method may be embodied in a computing device comprising a touchscreen and speaker for displaying the questions, receiving the subject's input answer, determining the subject's predominant resonant frequency, and playing the predominant resonant frequency to the subject.

An impedance tuner in a magnetic resonance system include at least one of an amplitude tuning circuit and a phase tuning circuit. The amplitude tuning circuit includes M serially-connected amplitude tuners. Each amplitude tuner includes at least one microwave transmission line and a first switch circuit connected in parallel, wherein the first switch circuit controls the at least one microwave transmission line to be in an on state or an off state, respectively, and the value of M is a positive integer greater than or equal to 1. The phase tuning circuit includes a phase tuner, and the phase tuner includes P second microwave transmission lines and a second switch circuit, wherein the second switch circuit controls the P second microwave transmission lines to be in an on state or an off state, respectively, and the value of P is a positive integer greater than or equal to 2.

An antenna comprises a support layer and a reflecting element arranged on the support layer for reflecting an incident wave with a corresponding reflection phase, the reflecting element extending vertically from the support layer with a height configured to achieve the respective reflection phase, the support layer and the reflecting element being formed of an all-dielectric material. The antenna is less susceptible to metal corrosion and is flexible in design. It provides complete reflection and phase adjustment simultaneously with a simple and compact structure. The simple structure of the antenna enables it to be manufactured in an efficient and economical manner.

A mm-wave signal generation technique that provides background phase tuning and self-alignment between adjacent sources. This technique is based on direct monitoring of the mm-wave signal and provides phase tuning through a baseband feedback loop. The techniques may be advantageous for phase alignment of large-scale mm-wave phased arrays.

A phased array system comprising an array of antennas outputting or receiving electromagnetic radiation to or from a steerable direction, wherein the electromagnetic radiation is at submillimeter wavelengths. The system further comprises a plurality of waveguides outputting or receiving the signals to or from the antennas, each of the waveguides with individual phase tuning. The waveguides are configured and dimensioned to guide an electromagnetic wave comprising the signals having a frequency in a range of 100 gigahertz (GHz) to 1000 terahertz (THz). The system further comprises means for phase shifting the signal by means of shifting or varying one or more phases of the signals relative to one another so as to vary, steer, or scan a direction of the electromagnetic radiation.