122 results about "Injection locked" patented technology

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.

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.

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 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 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.

The invention provides a clock data recovery method and device based on injection locking. The method comprises the following steps: sampling an analog clock signal to obtain an initial sampling signal; performing clock error detection on the initial sampling signal to obtain a clock error signal; performing first digital filtering processing on the clock error signal to obtain a first clock control signal; acquiring a clock jitter estimated value output by a digital filter in the injection-locked oscillator, injecting the clock jitter estimated value into the clock error signal, then performing second digital filtering processing, and performing calculation based on the clock signal subjected to the second digital filtering processing to obtain a second clock control signal; a phase of the sampled clock signal is adjusted based on the first clock control signal and the second clock control signal. The invention further provides a device for implementing the method. The clock data recovery method provided by the invention has strong tracking capability on clock jitter and low noise, and can be applied to the next-generation communication technology.

The invention discloses a W-band ultra-wideband voltage-controlled oscillator based on an injection locking technology, which comprises a fundamental frequency broadband voltage-controlled oscillator, an injection locking frequency multiplier, an output buffer module and an output matching module, and is characterized in that the fundamental frequency broadband voltage-controlled oscillator is used for generating a broadband fundamental frequency signal in a differential form; the injection locking frequency multiplier is used for receiving the broadband fundamental frequency signals in the differential form, generating higher harmonics and extracting and amplifying the higher harmonics to obtain high-frequency signals; the output buffer module is used for isolating the influence of a post-stage load and keeping the amplitude and phase stability of a high-frequency signal; and the output matching module is used for optimizing the transmission efficiency of the high-frequency signal and coupling the power of the high-frequency signal to a post-stage load to the maximum extent so as to reduce reflection loss. The W-band ultra-wideband voltage-controlled oscillator still has excellent performance in a millimeter wave band, and indexes such as phase noise and tuning bandwidth are improved.

The invention discloses a high-frequency frequency testing device and method and a wireless radio frequency communication system, and relates to the technical field of wireless radio frequency communication. The first frequency divider is connected with the injection locking frequency divider and is used for carrying out frequency reduction processing on an output signal of the injection locking frequency divider; the frequency divider calibration module is respectively connected with the first frequency divider and the injection locking frequency divider, and is used for determining whether the frequency division range of the injection locking frequency divider at the current moment contains a target frequency range corresponding to the to-be-detected signal or not when the injection locking frequency divider is in a frequency divider calibration mode; if not, the resonant frequency is adjusted, so that the frequency division range of the injection locking frequency divider contains the target frequency range; and the controller is connected with the injection locking frequency divider and is used for controlling the injection locking frequency divider to enter a high-frequency frequency test mode under the condition that the frequency division range of the injection locking frequency divider contains the target frequency range. According to the invention, accurate testing of high frequency can be realized with low cost.

Systems and methods for integrating injection locked oscillators into a transceiver array are disclosed. In one aspect, an injection locked oscillator (ILO) distribution system is provided that includes a master clock generator configured to generate a master clock signal. The ILO distribution system also includes an ILO distribution circuit that includes an ILO and is configured to receive the master clock signal. The ILO is configured to generate a reference clock signal based on the master clock signal. The ILO distribution circuit is further configured to generate an output signal that indicates an operating frequency of the ILO. The ILO distribution system also includes an injection locked detector (ILD) configured to receive the master clock signal and the output signal. The ILD is further configured to determine whether the ILO is in a locked state or an unlocked state based on the master clock signal and the output signal.

The invention relates to the technical field of digital-analog hybrid integrated circuit design, and particularly provides an anti-radiation low-jitter injection-locked phase-locked loop based on a threshold filtering technology, which comprises a pulse calibration circuit, a pulse injection unit and an injection-locked phase-locked loop, the pulse injection unit can generate an injection signal and a threshold signal according to a pulse calibration signal output by the pulse calibration circuit and a feedback signal output by the injection-locked phase-locked loop, so that whether the injection signal is output to the injection-locked phase-locked loop or not is judged according to the threshold signal. Reinforcement is performed based on an injection locked phase-locked loop structure, the pulse injection unit is provided, the threshold signal is generated while the injection signal is generated, and the conduction state of the injection path of the injection signal is controlled according to the threshold signal, so that the probability of wrong injection is greatly reduced, most injection errors are filtered from the source, and the injection accuracy is improved. Therefore, the jitter of the phase-locked loop is reduced, and the anti-radiation performance is improved.

The invention relates to the technical field of pen type injection devices, in particular to an allowance monitoring and locking structure and an injection device. Comprising a shell, a push rod, a clutch, a driving rod, a limiting ring, a termination ring and a dose setting ring, the limiting ring is fixedly connected into the shell, the clutch is sleeved with the limiting ring, the termination ring is arranged at the end, away from the limiting ring, of the clutch, the driving rod is arranged in the shell, one end of the driving rod extends out of the shell, and the push rod is arranged in the driving rod; the push rod extending out of the driving rod sequentially penetrates through the terminating ring, the clutch and the limiting ring; the dose setting ring sleeves the end part of the shell, and the dose setting ring is meshed with the driving rod; the termination ring reciprocates in the axial direction of the push rod and is used for monitoring the residual amount of the injection liquid medicine; the termination ring is provided with a push rod termination surface, the push rod is provided with an injection termination surface, and when the push rod termination surface is in contact with the injection termination surface, injection locking is performed; the locking function after injection is achieved, and the allowance monitoring function is achieved.

The application discloses a kind of millimeter wave injection locking frequency doubler, including complementary push-push frequency doubler circuit and two parts of injection locking oscillator.Complementary push-push frequency doubler circuit is used to generate harmonic signal with frequency doubling, and injection locking oscillator is used to lock the harmonic generated by complementary push-push frequency doubler circuit, and complementary push-push frequency doubler circuit is directly coupled with injection locking oscillator and connected.The input fundamental wave signal generates harmonic component through complementary push-push frequency doubler circuit, and then directly coupled with injection locking oscillator to realize frequency doubling.Compared with the structure of traditional frequency doubler, the application still has a wide locking range when the input power is small, and has the advantages of low input sensitivity, low power consumption, high integration and the like.

One technical solution of the present invention is to provide a deep reservoir optical computing method based on semiconductor lasers, and another technical solution of the present invention is to provide a deep reservoir optical computing system. In the present invention, each layer of the reservoir is mainly composed of a semiconductor laser and an optical delay line, and a large number of virtual neurons are generated thereby. The output of the laser in the upper layer of the reservoir is unidirectionally injected into the laser of the lower layer of the reservoir through the optical injection locking technology, thereby realizing the deep architecture of the reservoir computing. The depth of the reservoir optical computing system proposed by the present invention is not limited, so it has good scalability. The connection between the reservoir layers is an all-optical connection, so it has the advantages of simple device, low cost and low energy consumption.

A laser injection locking apparatus comprising: a primary laser 402 configured to emit light of a first polarisation; a secondary laser 404 injected by light from the primary laser, and connected to t

The invention discloses a receiving and transmitting integrated quantum key distribution device and method. The device serves as a transmitting end and a receiving end at the same time. When serving as a transmitting end, the optical injection locking device generates an optical pulse group, the optical pulse group passes through the optical attenuator and then is input into the unequal-arm Mach-Zehnder interferometer to obtain a quantum state of a corresponding basis vector, and then the quantum state is input into a quantum channel; when serving as a receiving end, the quantum state is received from the quantum channel, and the Z-base quantum state is output to the third single-photon detector to be decoded after passing through the light beam splitter; an X-based or Y-based quantum state is output to the unequal-arm Mach-Zehnder interferometer after passing through the light beam splitter, and then is output to the first single-photon detector and the second single-photon detector for decoding. According to the quantum key distribution system, external modulation is not needed, quantum state preparation and measurement can be carried out in one device only by using one interferometer, the complexity of the quantum key distribution system is reduced, the compactness of the quantum key distribution system is improved, and practicability is facilitated.

The invention discloses a tunable step frequency microwave carrier system based on a double-pump Brillouin cavity. The system comprises a Brillouin laser cavity, a frequency shift injection locking loop and an optical circulation frequency shift ring. According to the system, two laser beams with tunable wavelengths serve as pump light, a Brillouin laser cavity is formed to generate first-order Brillouin laser, the frequency of the pump laser is locked and the line width of the pump laser is compressed by using a frequency shift injection locking technology, and dual-wavelength Brillouin laser with the compressed line width is generated; the dual-wavelength Brillouin laser interval is changed by tuning the laser frequency through a driver or replacing the DFB wavelength; in the optical circulation frequency shift ring, programming control is carried out on the acoustic optical modulator through a signal generator, and finally a microwave source with programmable sweep frequency bandwidth is generated through a photoelectric detector. The device can generate high-quality microwave signals with adjustable frequency and controllable stepping, and is suitable for the fields of radar, communication, measurement and the like.