149 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.

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 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.

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.

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.

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.

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 present invention provides an integrated distributed optical fiber sensing system comprising: an on-chip integrated laser (1), an injection locking unit (3), a distributed feedback laser (2), a semiconductor optical amplifier (5), an optical circulator (6), a sensing optical fiber (7), and a coherent detection unit (4), wherein the on-chip integrated unit (10a) is obtained by on-chip integration of the injection locking unit (3) and the coherent detection unit (4).

The invention discloses a double-optical comb interlocking system based on self-injection locking. The system comprises a first DFB laser, a second DFB laser, a first micro-ring, a second micro-ring, a first waveguide, a second waveguide, a third waveguide, a first electro-optical modulator, a second electro-optical modulator, an adjustable optical filter, a photoelectric detector, a microwave source, a phase-locked loop, a signal source, a frequency mixer and a frequency locking circuit. Back scattering light in the second micro-ring is fed back to the second DFB laser, so that the output wavelength of the second DFB laser is locked to the pumping wavelength of the first DFB laser, and the first degree of freedom of the double optical combs is locked; a micro-cavity optical comb generated by a first micro ring pumped by the first DFB laser device is used as a main comb, a micro-cavity optical comb generated by a second micro ring pumped by the second DFB laser device is used as a slave comb, the other group of aligned comb teeth are filtered out through the adjustable optical filter except for the pumping light wavelength, comb tooth beat frequency signals are subjected to frequency doubling and then locked with the repetition frequency difference of the main comb and the slave comb, and the frequency of the comb teeth is adjusted. Therefore, the second degree of freedom of the double optical combs is locked. According to the invention, interlocking of the self-injection locking double optical combs can be realized.

The invention belongs to the technical field of photoelectricity, and particularly relates to a broadband frequency doubling device based on a harmonic injection locking optoelectronic oscillator and an implementation method. According to the invention, + / -1-order optical sidebands are generated by using a carrier suppression double-sideband modulation mode of the electro-optical intensity modulator, and initial second-order harmonic injection signals are generated after beat frequency of the photoelectric detector. And when the frequency of the injection signal is aligned with the oscillation mode in the ring cavity of the photoelectric oscillator, the frequency of the oscillation mode output by the photoelectric oscillator is locked at the frequency of the injection signal, and finally, the output of the frequency doubling signal with optimized phase noise is realized.

This invention discloses a terahertz signal generation system and method based on space-based optical radio frequency technology, comprising an optical comb generation module, an optical carrier frequency selection and modulation module, a transmission module, and a photoelectric conversion module arranged sequentially. The optical comb generation module generates an optical frequency comb. The optical carrier frequency selection and modulation module selects at least two optical carriers from the optical frequency comb and modulates the optical carriers with radio frequency signals to obtain multiple optical signals. The invention utilizes space-based optical radio frequency technology to achieve the generation and transmission of ultra-wideband terahertz signals, overcoming the bandwidth limitations of traditional electronic technology and the problem of excessive loss of terahertz signals during long-distance transmission. Optical injection locking technology is used to suppress spurious signals generated during optical domain signal processing. Furthermore, the reconfigurable generation of terahertz signals can be achieved through the joint control of the local oscillator signal and dual lasers, realizing the generation and transmission of high-speed, stable, and low-spurious broadband terahertz communication signals.

The invention discloses a millimeter wave orthogonal injection locking frequency tripler, which comprises an orthogonal coupling tube and two same in-phase injection locking frequency triplers, and is characterized in that fundamental wave signals are injected through positive input ends and negative input ends of the two in-phase injection locking frequency triplers; the two in-phase injection locking frequency triplers generate frequency multiplication harmonic signals based on the fundamental wave signals respectively, and the two in-phase injection locking frequency triplers are connected in parallel through the orthogonal coupling tube so as to output four-phase orthogonal signals based on the frequency multiplication harmonic signals generated by the two in-phase injection locking frequency triplers. The millimeter wave orthogonal injection locking frequency tripler provided by the invention has the advantages of low phase noise, broadband tuning, high orthogonal precision and the like.

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.

The invention provides a high-speed clock and data recovery circuit supporting dual-mode input. The high-speed clock and data recovery circuit comprises a linear phase discriminator, a voltage / current converter, a loop filter, an LC voltage-controlled oscillator, an injection locking type multi-phase clock generation circuit, a data recovery circuit and a logic decision circuit. The linear phase discriminator can carry out direct phase discrimination on NRZ and PAM4 data, high gain and linearity are realized by matching with the logic decision circuit, and the loop bandwidth is increased; according to the injection locking type multiphase clock generation circuit, good locking stability and low noise performance of an LC voltage-controlled oscillator are achieved, and mutual deterioration of jitter tolerance and recovery clock jitter phase noise caused by a traditional architecture is eliminated. According to the invention, high jitter tolerance and good clock phase noise recovery performance can be realized at the same time, the bit energy consumption is relatively low, and dual-mode input is supported.

The invention discloses a terahertz signal generation system and method based on a space radio-over-fiber technology. The terahertz signal generation system comprises an optical comb generation module, an optical carrier frequency selection and modulation module, a transmission module and a photoelectric conversion module which are arranged in sequence. The optical comb generation module is used for generating an optical frequency comb; the optical carrier frequency selection and modulation module is used for screening out at least two optical carriers from the optical frequency comb and carrying out radio frequency signal modulation on the optical carriers to obtain multiple paths of optical signals; according to the invention, generation and transmission of ultra-wideband terahertz signals are realized by using a space radio-over-fiber technology, the problems of bandwidth limitation of a traditional electronic technology and overlarge loss of the terahertz signals during long-distance transmission are solved, and spurious signals generated in an optical domain signal processing process are suppressed by using an optical injection locking technology. Reconfigurable generation of terahertz signals can be realized through combined regulation and control of local oscillator signals and double lasers, and generation and transmission of high-speed, stable and low-stray broadband terahertz communication signals are realized.

The utility model discloses a time-phase high-speed quantum key coding system based on injection locking. The time-phase high-speed quantum key coding system comprises a first laser, a second laser, a third laser, a first intensity modulator, an unequal-arm interference module and a second intensity modulator, the first laser is connected with the first intensity modulator, the first intensity modulator is respectively connected with the second laser and the third laser, the second laser and the third laser are respectively connected with the unequal-arm interference module, and the unequal-arm interference module is connected with the second intensity modulator. The utility model discloses a time-phase high-speed quantum key coding system based on injection locking, and the system employs the injection locking technology to enable the energy of pulse optical signals emitted by a second laser and a third laser to be more concentrated, thereby enabling the line width to be narrower. And the noise and jitter of the output pulse optical signal are smaller, so that the pulse quality is better, the system is more stable, the code rate is higher, and high-speed coding can be really realized.

The present invention makes it possible to optimize the pulse width of an injection pulse while suppressing an increase in circuit scale.　This phase synchronization circuit is provided with: an injection lock unit that resets an oscillation output on the basis of an injection pulse; and a calibration unit that calibrates the pulse width of the injection pulse on the basis of the pulse width of the injection pulse and frequency information of the oscillation output. The calibration unit may calibrate the pulse width of the injection pulse on the basis of a comparison result between a first voltage generated on the basis of the pulse width of the injection pulse and a second voltage generated on the basis of a ratio relative to the period of the oscillation output.