178 results about "Injection locked" patented technology

The invention provides a clock signal generating circuit, a wired communication transceiver and electronic equipment, and the circuit outputs a first DC voltage comprising phase difference information and frequency difference information of a reference clock signal and a feedback clock signal through a phase frequency detection module. The pulse generator generates a narrow pulse signal based on the DC voltage and a reference clock signal, the oscillation frequency of each secondary ring oscillator in the cross-coupled ring oscillator is controlled by the first DC voltage, and the cross-coupled loop performs synchronous coupling and phase sequence adjustment processing on each secondary ring oscillator. One output node in the cross coupling ring oscillator receives the narrow pulse signal, frequency and phase locking is completed in an injection locking mode, and the frequency divider is used for conducting frequency division processing on any high-frequency clock signal and outputting a feedback clock signal. Therefore, a high-frequency multi-phase clock signal with low phase noise and high phase precision can be generated by using the low-frequency reference clock signal.

An injection-locked oscillator includes a plurality of delay elements, two or more voltage control circuits, a phase comparator and a controller. The plurality of delay elements is connected in a loop and coupled to a global power supply. Each delay element has an input driven by a preceding stage and an output that drives a next stage. Each voltage control circuit couples one of the plurality of delay elements to the global power supply. The phase comparator is coupled to in-phase and quadrature outputs of the injection-locked oscillator. The controller is coupled to an output of the phase comparator and is configured to drive control inputs of the two or more voltage control circuits. The control input of each voltage control circuit determines a level of a voltage drop across the each voltage control circuit.

Circuits and methods for multi-phase clock generators and phase interpolators are provided. The multi-phase clock generators include a delay line and multi-phase injection locked oscillator. At each stage of the multi-phase injection locked oscillator, injection currents are provided from a corresponding stage of the delay line. Outputs of the multi-phase injection locked oscillator and provided to mixers which produce inputs to an operational transconductance amplifier which provides feedback to the delay line and the multi-phase injection locked oscillator. The phase interpolator uses a technique of flipping certain input clock signals to reduce the number of components required while still being able to interpolate phase over 360 degrees and to reduce noise.

An injection-locked oscillator includes a plurality of delay elements, two or more voltage control circuits, a phase comparator and a controller. The plurality of delay elements is connected in a loop and coupled to a global power supply. Each delay element has an input driven by a preceding stage and an output that drives a next stage. Each voltage control circuit couples one of the plurality of delay elements to the global power supply. The phase comparator is coupled to in-phase and quadrature outputs of the injection-locked oscillator. The controller is coupled to an output of the phase comparator and is configured to drive control inputs of the two or more voltage control circuits. The control input of each voltage control circuit determines a level of a voltage drop across the each voltage control circuit.

The invention discloses a narrow-linewidth double-frequency laser generation method, and belongs to the technical field of microwave photons. Two paths of optical signals generated by two semiconductor lasers with different wavelengths are injected into the same optical microcavity, the two paths of optical signals enter a self-injection locking state in different modes of the optical microcavity, and the optical microcavity can output narrow-linewidth double-frequency laser. The invention further discloses a narrow-linewidth double-frequency laser generating device and a photo-production microwave method and device. Two double-frequency lasers with different frequencies are locked on one optical microcavity through an original double-self-injection locking technology, the problem of phase noise of a double-frequency light source is effectively solved while the linewidth of the input laser is narrowed, common-mode noise caused by mode difference of the two lasers in a locking state is eliminated, and the dual-frequency light source has the advantages of being simple in structure and convenient to operate. And the traditional servo locking technology is not needed, so that the complexity of the system is simplified.

The invention relates to the technical field of semiconductor lasers, and particularly provides a tunable narrow-linewidth multi-wavelength laser based on injection locking, which comprises a light source, an optical splitter, a coupler, a photoacoustic frequency shifter and a micro-ring, the optical path of each sub-beam is provided with a photoacoustic frequency shifter and a micro-ring, the photoacoustic frequency shifters are responsible for adjusting the frequency of the sub-beams, the micro-rings and a light source form an injection locking relation and compress the line width of the sub-beams, then all the sub-beams are combined through a coupler, and finally power amplification is conducted through a semiconductor optical amplifier. Through the optical splitter, the photoacoustic frequency shifter and the micro-ring, the single light source system outputs equally-spaced multi-wavelength laser, and the defects of a traditional multi-light-source design are overcome.

A coherent optical injection locking (COIL) apparatus generates multiple optical source outputs from a single optical source generated by a parent laser. The COIL apparatus includes a plurality of optical source generators each having a child laser, of lesser performance than the parent laser, that is injection locked to the single optical source. The optical source generators may have one or both of a shared configuration and a cascaded configuration that replicates the single optical source, or a single wavelength of the single optical source when it is a comb source.

The present application discloses a high-power single-frequency pulsed laser based on an injection locking technology, including a pump light supply device, a seed light supply device, a slave laser, a light detector and a servo control system. The servo control system receives a probe signal outputted by the light detector and controls the cavity length of the slave laser according to an error signal extracted from the probe signal. The light detector has the characteristic of saturation current, and after the probe light enters the light detector, the pulse current becomes saturated and the modulated seed current becomes unsaturated. According to the present application, a light detector with pulse saturation current characteristics is adopted to effectively avoid the problem that the error signal cannot be obtained and it is difficult to achieve injection locking.

The invention discloses a single-laser self-injection locking resonant optical gyroscope based on light intensity detection and a working method thereof, and belongs to the technical field of optical gyroscopes, a working light source DFB laser is connected with a first port of a circulator, and a second port of the circulator is connected with a beam splitting coupler through an isolator; two output ends of the beam splitting coupler are respectively connected with an input end of the echo wall microcavity and the phase modulator, and the phase modulator is connected with the other input end of the echo wall microcavity; a first port of the output end of the echo wall microcavity is connected with a third port of the circulator, and a second port of the output end of the echo wall microcavity is connected with the frequency locking amplifier through the photoelectric detector. According to the invention, the problems of high cost of double light sources in the self-injection locking resonant optical gyroscope and frequency drift and complex structure of beat frequency detection are solved, so that the measurement precision and economical efficiency of the gyroscope are effectively improved.

The invention discloses an ultra-wideband reconfigurable injection-locking multi-mode single-ended input / output frequency divider circuit, which comprises an input unit, a frequency dividing circuit connected with the input unit and an output unit connected with the frequency dividing circuit, and is characterized in that the frequency dividing circuit comprises an injection-locking two-half frequency dividing circuit and an injection-locking three-half frequency dividing circuit; the input unit uses a Balun structure circuit to enable the injection locking frequency-halving circuit and the injection locking frequency-tripling circuit to be the same single-end input, and the output unit uses a Multi-tank resonance network structure to realize single-end output of two frequency-tripling and frequency-tripling modes. In the design of the broadband millimeter wave phase-locked loop chip, better efficacy and ultra-wideband performance can be realized, the cost is lower, and the integration is easy.

An electronic device may include clocking circuitry with primary and secondary lasers that generate first and second optical local oscillator (LO) signals. A phase-locked loop (PLL) may tune the secondary laser based to phase lock the first and second optical LO signals. A self-injection locking loop path may couple an output of the secondary laser to its input. The self-injection locking loop path may include a first mixer and a second mixer. The first mixer may generate a beat signal using the first and second optical LO signals. The second mixer may generate a self-injection locking signal based on the first optical LO signal and the beat signal. A delay line or optical resonator may iteratively self-inject the self-injection locking signal onto the secondary laser. This may serve to minimize phase noise and jitter of the optical LO signals.

In some implementations, a circuitry may include a series of symmetrical stages with an initial stage in the series coupled to an input signal having a first plurality of phases and an output stage in the series coupling an output signal comprising a second plurality of phases to a calibration engine, where a quantity of the phases in the output signal is increased based at least on a quantity of the symmetrical stages and a quantity of the first plurality of the phases in the input signal. In addition, the circuitry may include implementations, where the calibration engine calibrates a frequency of the circuitry within a range based at least on a target frequency. The circuitry may include implementations, where the calibration engine outputs a current provided to the series, where the output current can be based at least on a calibrated frequency.

An electronic oscillator circuit includes: a resonant circuit including an inductor and a capacitor, where each of the inductor and the capacitor has a first terminal connected to a first side of the resonant circuit and a second terminal connected to a second side of the resonant circuit; a first current controller; and a second current controller; wherein the first current controller is connected to a first side of the resonant circuit; wherein the second current controller is connected to a second side of the resonant circuit; wherein the first current controller is arranged to enable it to act as a current source of the resonant circuit; wherein the second current controller is arranged to enable it to act as a current tank of the resonant circuit; wherein the first current controller and the second current controller are configured such that the injection current flows from the first current controller to the second current controller through the resonant circuit when the first current controller and the second current controller are in a first state; and when the first current controller and the second current controller are in the second state, no current is injected into the resonant circuit. The current injected in this manner allows energy to be injected into the resonant circuit, which forces oscillation in the resonant circuit to proceed at a predetermined frequency different from the natural resonant frequency of the resonant circuit.

The invention provides a two-way control injection locking method for a satellite-borne large-energy single-frequency laser. A two-way control injection system comprises an injection locking controller, a seed laser, an oscillator, an oscillator power supply, an RTP phase modulator, piezoelectric ceramics (PZT), a photoelectric detector, a Q switch driver, an amplifier, an amplifier power supply and a Q switch. The invention relates to a novel double-path control injection locking technology, adopts an RTP phase modulator to quickly adjust the scanning cavity length, and is assisted by a PZT to slowly scan the cavity length, so that the problem of poor energy stability of a satellite-borne large-energy compact single-frequency laser is solved, and the energy stability of the satellite-borne large-energy compact single-frequency laser is improved. The energy stability can be improved by one order of magnitude, and large-energy single-frequency pulse laser output superior to 0.5% of hundred millijoule magnitude can be obtained; the high-stability large-energy single-frequency laser output realized by the invention can be used for satellite-borne wind measurement laser radars and satellite-borne hyperspectral laser radars.

Techniques are described related to digital radio control and operation. The various techniques described herein enable high-frequency local oscillator (LO) signal generation using injection locked cock multipliers (ILCMs). The techniques also include the use of LO signals for carrier aggregation applications for phased array front ends. Furthermore, the disclosed techniques include the use of array element-level control using per-chain DC-DC converters. Still further, the disclosed techniques include the use of adaptive spatial filtering and optimal combining of analog-to-digital converters (ADCs) to maximize dynamic range in digital beamforming systems.

A clock and data recovery circuit includes a frequency tracking loop and a phase tracking circuit. The frequency tracking loop includes an injection locked oscillator configured to adjust an oscillation frequency to generate an output signal, receive an input data signal, and extract an output clock from the input data signal, where the output signal has a frequency tracking a reference clock frequency. The phase tracking circuit is coupled to the frequency tracking loop and includes a phase interpolator and a finite state machine. The phase interpolator is used for receiving an output clock and adjusting the phase of the output clock according to an input program code to generate a sampling clock for sampling a signal to generate an anti-serialized signal. The finite-state machine is coupled to the phase interpolator and is used for outputting the program code to the phase interpolator according to the anti-serialization signal of the multiplexer so as to adjust the phase of the output clock.

The present invention provides a dual-path controlled injection locking method for a satellite-borne high-energy, single-frequency laser. The dual-path controlled injection system includes an injection locking controller, a seed laser, an oscillator, an oscillator power supply, an RTP phase modulator, a piezoelectric ceramic (PZT), a photodetector, a Q-switch driver, an amplifier, an amplifier power supply, and a Q-switch. This novel dual-path controlled injection locking technology utilizes an RTP phase modulator for rapid cavity length scanning, supplemented by a PZT for slow cavity length scanning. This solves the problem of poor energy stability in satellite-borne, high-energy, compact, single-frequency lasers, improving energy stability by an order of magnitude and achieving high-energy, single-frequency pulsed laser output on the order of 100 millijoules with an output better than 0.5%. The high-stability, high-energy, single-frequency laser output achieved by this invention can be used in satellite-borne wind measurement lidars and satellite-borne hyperspectral lidars.

The application discloses an ultra-wideband reconfigurable injection locking multi-mode single-ended input / output frequency divider circuit, comprising an input unit, a frequency division circuit connected with the input unit, and an output unit connected with the frequency division circuit, wherein the frequency division circuit comprises an injection locking two-frequency division circuit and an injection locking three-frequency division circuit; the input unit utilizes a balun structure circuit, so that the injection locking two-frequency division circuit and the injection locking three-frequency division circuit are the same single-ended input; and the output unit utilizes a Multi-tank resonant network structure to realize single-ended output of two / three frequency division modes. The application can realize better efficacy, ultra-wideband performance, lower cost and easy integration in the design of a wideband millimeter wave phase-locked loop chip.

The embodiment of the invention relates to oscillator synchronization. A circuit includes an injection locked oscillator circuit (402) and a sensing circuit (404). The injection locked oscillator circuit (402) has an input and an output. The sensing circuit (404) includes a sampling circuit (504) and a comparator (506). The sampling circuit (504) has a first input coupled to the input of the injection locked oscillator circuit (402), a second input coupled to an output of the injection locked oscillator circuit (402), and an output. The comparator (506) has an input coupled to the output of the sampling circuit (504), and an output.

The invention provides a self-injection locking multi-linewidth laser based on Gaussian phase modulation and Brillouin scattering and a multi-linewidth laser generation method thereof. A working light source DFB laser is connected with a first port of a circulator, and a second port of the circulator is connected with an optical fiber resonant cavity through a coupler I; the optical fiber resonant cavity is connected with the output end B through a third port of the coupler II and a third port of the coupler III; a No.2 port of the coupler III is connected with an output end C through a phase modulator; a first port of the coupler III is connected with an attenuator through a Gaussian phase modulator, and the attenuator is connected with a working light source DFB laser through a fourth port and a first port of a circulator. Brillouin scattering in the optical fiber resonant cavity is connected with a second port of the circulator through the coupler I, and a third port of the circulator is connected with the output end A; the invention is used for solving the problem that a dual-frequency and multi-line-width laser can simultaneously meet light sources of different types of RMOGs, can effectively improve the versatility of the laser, and reduces the research and development cost of the optical gyroscope.

An injection locked ring oscillator (ILRO) system is disclosed. The ILRO system includes an ILRO circuit configured to receive a plurality of injection control signals and a phase control signal, and to generate a plurality of output clock signals; a phase detector circuit configured to receive the output clock signals and to generate a phase output signal based on phase differences of particular pairs of the output clock signals; and a phase to voltage circuit configured to receive the phase output signal from the phase detector circuit, and to generate the phase control signal based on the phase output signal, where the phase control signal presents a negative feedback phase signal to the ILRO circuit for the phase differences in the particular pairs of the output clock signals.

The application provides an automatic resonant frequency-doubled laser based on an injection-locked semiconductor seed source, which forms injection locking by injecting the fundamental frequency light transmitted when the resonant frequency-doubled cavity resonates into the semiconductor seed source through the coupling light path, so that the seed light emitted by the semiconductor seed source and the resonant frequency-doubled cavity are always in a resonant state, and automatic resonant frequency doubling is realized. Compared with a traditional resonant frequency-doubled laser, the laser of the application can realize automatic resonance of the seed light and the resonant frequency-doubled cavity without an additional active optical and electrical control link, realize continuous and efficient transmission laser output, has a simple structure, and in the traditional resonant frequency-doubled laser scheme which needs active locking, the fundamental frequency light is required to be single-frequency laser, and the application does not have this requirement, and the fundamental frequency light transmitted by the resonant frequency-doubled cavity can also operate in multiple modes which are resonant with the resonant frequency-doubled cavity by injection locking in the semiconductor seed source.

The embodiment of the invention provides a frequency calibration method and circuit, electronic equipment, a chip and a medium, and relates to the field of integrated circuits, and the method comprises the steps: determining the input power of a voltage-controlled oscillator group based on a preset calibration interval; traversing a capacitor array of a first voltage-controlled oscillator in the voltage-controlled oscillator group, determining the output power of the first voltage-controlled oscillator under the input power until the input power and the output power meet an injection locking condition, and obtaining a target control value of the capacitor array of the first voltage-controlled oscillator, the target control value is used for determining the calibration frequency of the first voltage-controlled oscillator. According to the method provided by the invention, the calibration efficiency and the frequency switching speed are improved while the calibration precision is ensured, so that the frequency hopping capability of the whole signal chain system is greatly improved.

The invention relates to a generation system and a generation method of a three-band coherent microwave signal. The system comprises a laser, an electro-optical modulator, an optical fiber ring, a photoelectric detector, a first bridge, a second bridge, a first broadband filter, a second broadband filter, a third broadband filter, a tunable filter, a first amplifier, a second amplifier, a third amplifier, a fourth amplifier, a coupler, an external signal source, a signal generator and the like. The generating system disclosed by the invention is a Fourier domain mode-locked photoelectric oscillator system for generating coherent microwave signals of three frequency bands based on difference frequency injection locking, and a Fourier domain mode-locked photoelectric oscillator autonomously-generated signal is combined with an external injection signal; therefore, multiple frequency band sweep frequency signals with good coherence and strong tunability can be output at the same time. The generated microwave signals of three frequency bands have good tunability and coherence, and the formed three-loop Fourier domain mode-locked optoelectronic oscillator system can be applied to multiple fields.

This invention discloses an integrated quantum key distribution device and method, which serves as both a transmitter and a receiver. As a transmitter, an optical injection locking device generates a group of optical pulses, which, after passing through an optical attenuator, are input to an unequal-arm Mach-Zehnder interferometer to obtain the quantum states of the corresponding basis vectors, and then input to a quantum channel. As a receiver, quantum states are received from the quantum channel. For Z-based quantum states, the output is sent to a third single-photon detector for decoding after passing through an optical beamsplitter; for X-based or Y-based quantum states, the output is sent to the unequal-arm Mach-Zehnder interferometer after passing through an optical beamsplitter, and then to a first and second single-photon detector for decoding. This invention eliminates the need for external modulation, enabling quantum state preparation and measurement within a single device using only one interferometer. This reduces the complexity of the quantum key distribution system, improves its compactness, and facilitates practical application.

A system includes an oscillator and an injection circuit coupled to the oscillator. The injection circuit includes a first injection branch coupled to a node, wherein the first injection branch is configured to receive a first clock signal and generate a first injection current based on the first clock signal. The injection circuit also includes a second injection branch coupled to the node, wherein the second injection branch is configured to receive a second clock signal and generate a second injection current based on the second clock signal, and wherein the first injection current and the second injection current are combined at the node.

A self-injection locked narrow linewidth laser based on a waveguide resonant ring belongs to the field of semiconductor laser technology. It includes a distributed feedback semiconductor laser, a current driver, a first temperature controller, a polarization-maintaining fiber circulator, a waveguide resonant ring, a second temperature controller, a polarization-maintaining fiber coupler, and a polarization-maintaining fiber adjustable attenuator. In the self-injection locked narrow linewidth laser of the present invention, the input and output ends of the optical element are both polarization-maintaining fibers, and the all-fiber device solves the difficulty of accurately adjusting the position of the laser and the external cavity; the feedback light intensity is controlled by adjusting the polarization-maintaining fiber adjustable attenuator, which reduces the influence of environmental disturbances such as air flow and mechanical vibration on the feedback light path, and has better stability; a dual straight waveguide resonant ring structure is introduced in the external resonant cavity of the semiconductor laser, and the transmitted light is used for feedback, which suppresses high-frequency noise and can obtain a continuous narrow linewidth output.

Injection locking control method, injection locking control device and laser radar, the injection locking control method is applied to a laser group, including: obtaining the laser signal output by the slave laser; judging whether the slave laser is injection locked based on the laser signal output by the slave laser; if the result of judging whether the slave laser is injection locked is no, obtaining the continuous loss of lock information of the slave laser; judging whether the slave laser meets the preset correction condition based on the continuous loss of lock information; if the result of judging whether the slave laser meets the correction condition is yes, adjusting the frequency of the slave laser. The above scheme can improve the correction efficiency of injection locking, thereby ensuring the laser detection efficiency of the laser radar.

The embodiment of the present invention provides a dynamic BOTDA sensing method and system based on injection-locked high-order sideband output. The method includes: the laser output by the light source is divided into a first sub-beam and a second sub-beam; a channel of the arbitrary waveform generator generates a pulse signal, which is loaded into the first sub-beam through a first electro-optical modulator, and modulated from continuous light to pulse pump light to enter the optical fiber to be tested; another channel of the arbitrary waveform generator generates an arbitrary wave signal, and the second sub-beam is modulated by a second electro-optical modulator to generate multi-order sidebands, each order sideband enters the slave laser to lock the preset sideband, obtains the detection light that locks the preset sideband and enters the optical fiber to be tested to generate stimulated Brillouin scattering with the pulse pump light to receive the generated scattered light; each scanning frequency of the arbitrary wave signal corresponds to each pulse of the pulse signal. The above-mentioned technology of the present invention can reduce the arbitrary wave bandwidth requirement by one order of magnitude in dynamic measurement because the high-order sidebands are injection-locked.