114 results about "Injection locking" patented technology

The invention relates to the technical field of signal detection, in particular to a weak electric field signal detection method and system. According to the invention, complete information of frequency, amplitude and phase of a to-be-measured electric field signal is obtained at the same time in one measurement of the injection locking phonon laser, a to-be-measured laser amplitude spectrum and a to-be-measured laser phase spectrum are generated by the same injection locking phonon laser, and the amplitude signal and the phase signal which are measured and received must arrive at the same time. The two are simultaneous in time and have natural orthogonality in physics; therefore, compared with a traditional double-phase lock amplifier for analyzing two asynchronous signals to be measured received by two frequency mixers, the method for analyzing the laser amplitude spectrum and the laser phase spectrum to be measured to obtain the electric field information to be measured has the advantages that the accuracy is higher; the double-phase lock amplifier solves the technical problem of measurement errors caused by deviation of to-be-measured signals received by two frequency mixers in a traditional double-phase lock amplifier.

The invention discloses a low-phase noise ring voltage-controlled oscillator based on multiphase injection locking, relates to the technical field of integrated circuits, and is used for solving the technical problems that an existing injection locking oscillator limits the frequency tuning range and cannot effectively suppress noise. The invention discloses a low-phase noise ring voltage-controlled oscillator based on multiphase injection locking. The low-phase noise ring voltage-controlled oscillator comprises a first ring oscillator unit and a second ring oscillator unit, the n first ring oscillator units are connected in series to form a chain structure; the second ring oscillator unit is provided with a cross coupling inverter complementary injection unit and a tail current source injection unit; a first output end of the chain structure is connected with a second input end of the second ring oscillator unit, and a second output end of the chain structure is connected with a first input end of the second ring oscillator unit; a first signal is injected into a cross-coupling inverter complementary injection unit and a tail current source injection unit, and a second ring oscillator unit receives a second signal output by a chain structure and then outputs a third signal.

A circuit includes a phase selector to generate an injection clock signal having an injection phase based on a phase of a digitally controlled oscillator clock signal generated within a phase-locking feedback loop. An injection-locked oscillator (ILO), coupled to an output of the phase selector, generates an ILO clock signal that is convertible to provide a feedback clock signal of the circuit. Logic, coupled between an output of the ILO and the phase selector, to, at each predetermined number of cycles of the DCO clock signal, cause the phase selector to output a phase shift in the injection clock signal that causes the ILO clock signal to comprise a rotated phase, relative to the injection phase, and that prevents a glitch in the injection clock signal.

The invention relates to the technical field of analog integrated circuits, and discloses a reference clock frequency multiplier circuit and a chip, and the reference clock frequency multiplier circuit comprises a phase discriminator, a charge pump, a loop filter, a voltage-controlled delay unit, a multiphase injection locked ring oscillator and an edge combiner. And the voltage-controlled delay unit, the phase discriminator, the charge pump and the loop filter form a multi-phase clock generator. The multi-phase injection clock signal is generated by adopting the voltage-controlled delay unit, and the multi-phase injection locking ring oscillator is further adopted as an input clock source of the edge combiner, so that the phase error of the multi-phase injection clock signal generated by the voltage-controlled delay unit is suppressed; therefore, a frequency multiplication clock signal with an accurate duty ratio and low noise is obtained.

The invention relates to the field of integrated circuits, in particular to a multi-injection locking annular traveling wave oscillator, a Doppler radar based on the annular traveling wave oscillator and physiological feature detection equipment based on the annular traveling wave oscillator. Comprising 16 inductive elements. Four variable capacitors and four mirror image injection circuits. The inductive elements are sequentially connected end to end. And every two adjacent inductive elements form a phase shift channel and are sequentially distributed in four orthogonal directions. And the two phase shift channels in each direction are parallel to each other and are positioned on the inner side and the outer side of the same layer of the layout. The phase shift channels on the inner and outer sides in adjacent directions are alternately connected, and the wires between the phase shift channels are distributed on the upper and lower layers in the layout at equal intervals. The mirror image injection circuit and the variable capacitor are connected between the two phase shift channels in each direction and output injection signals with the phase difference of 180 degrees to the phase shift channels. According to the invention, the problems of limited injection locking range, high noise and insufficient phase uniformity of the existing oscillator for the Doppler radar are solved.

The invention relates to the technical field of lasers, in particular to a narrow-linewidth frequency conversion laser which comprises a DFB laser, a first end of the DFB laser is used for outputting initial fundamental frequency light; the lithium niobate outer cavity comprises a spot size converter, a transmission waveguide provided with a phase shift part, a first multi-mode interference coupler, upper and lower speech channel micro-rings, a second multi-mode interference coupler and a periodically poled waveguide which are connected in sequence, and the upper and lower speech channel micro-rings and a Bragg grating of the DFB laser form a resonant cavity; the upper and lower speech channel micro-rings reflect a part of the received light back to the DFB laser to realize self-injection locking and output the other part of the received light to the second multimode interference coupler, the fundamental frequency light passes through the periodically polarized waveguide to realize frequency conversion, and the output end of the periodically polarized waveguide outputs frequency-doubled light; the lithium niobate outer cavity further comprises two comb-shaped electrodes which are symmetrically arranged on the two sides of the periodically poled waveguide. The performance of the narrow-linewidth frequency conversion laser can be improved at least.

The invention discloses an ultra-wideband ultra-low power consumption millimeter wave injection locking quadrupler, which realizes frequency multiplication bandwidth exceeding 100 GHz, 3 dB working bandwidth exceeding 10 GHz, 10 mW total power consumption and 1t under millimeter wave frequency through innovative resonant cavity design, adaptive bias and output equalization technology. And the output power fluctuation of 0.1 dB is obviously superior to that of other existing schemes, and the millimeter-wave radar antenna is suitable for a 76-81 GHz high-performance millimeter-wave radar system.

The invention relates to the technical field of radio frequency integrated circuits, and particularly provides a low-jitter injection locking phase-locked loop based on multiphase injection, which comprises an injection locking path unit, a locking unit and an injection locking ring oscillator, the injection locking path unit can generate a multi-phase injection signal and a complementary injection signal according to the received reference signal; the injection locking ring oscillator receives the multi-phase injection signal and the complementary injection signal and then generates an oscillation signal; and then the locking unit locks the injection locking phase-locked loop according to the generated oscillation signal. According to the invention, the injection locking path unit generates the multi-phase injection signal and the complementary injection signal, so that the injection locking ring oscillator is subjected to multi-phase direct injection and cross coupling complementary injection, and the multi-phase direct injection can reduce the jitter of the phase-locked loop based on the ring oscillator. And phase deviation generated by multi-phase direct injection is eliminated through cross coupling complementary injection, so that the injection intensity is further improved, and the noise suppression bandwidth is effectively expanded.

The invention provides a frequency stabilization device and a frequency stabilization method of an optical frequency comb, and relates to the technical field of optics, the optical frequency comb can be generated based on a self-injection locking principle through an optical frequency comb unit comprising a laser and a first micro-resonator of which the end faces are coupled, and then the optical frequency comb is generated through the first micro-resonator. Through the control system, the second micro-resonator is used as a reference resonator, the laser with the specific frequency of the optical frequency comb and the resonance mode of the second micro-resonator can be locked, and the frequency stability of the laser with all frequencies of the optical frequency comb is improved.

This invention discloses a reconfigurable injection-locked local oscillator system, comprising a voltage-controlled oscillator (VCO), an injection-locked frequency multiplier (ILL), and an injection-locked amplifier (ILA). The first output terminal of the VCO is connected to the first input terminal of the ILL, the second output terminal of the VCO is connected to the second input terminal of the ILL, the first output terminal of the ILL is connected to the first input terminal of the ILL, and the second output terminal of the ILL is connected to the second input terminal of the ILL. The VCO generates a low-frequency fundamental wave, the ILL multiplier performs frequency multiplication on the low-frequency fundamental wave to generate a second or third harmonic wave, and the ILL amplifies the power of the second or third harmonic wave, thereby improving the accuracy of the output millimeter-wave frequency.

This application provides a self-injection-locked narrow-linewidth laser with a quasi-continuous locking region, comprising: a semiconductor laser source for generating an initial linewidth laser and outputting it via end-face coupling; a photonic integrated microcavity chip including a bus waveguide and a microring resonator coupled to it via an evanescent wave, for receiving the initial linewidth laser and providing feedback light to the semiconductor laser through Rayleigh backscattering of the microring resonator to excite a self-injection-locking effect; the microring resonator is a compact folded waveguide microcavity with an ultra-low free spectral range, the free spectral range of which is less than a preset threshold, so that when the driving current of the semiconductor laser is changed for wavelength tuning, the self-injection-locking regions of adjacent resonant modes in the cavity physically overlap or are closely spliced ​​in the current tuning parameter space, so that the semiconductor laser can continuously transition between adjacent modes without experiencing permanent unlocking during continuous current tuning, forming a quasi-continuous locking region.

The application relates to a high-precision single-frequency laser seed injection locking method, steps S1, a resonant pulse signal is generated based on an FPGA unit and a piezoelectric ceramic, the resonant pulse signal collected by an ADC unit is monitored, and the time t1 required from the start of a slope voltage to the appearance of an error signal is recorded; steps S2, after the error signal is monitored, the slope voltage is slowly adjusted, the S-shaped waveform center position of a resonant cavity spectrum range corresponding to a plurality of resonant pulse signals is detected based on a peak value detection module, a PID feedback control program is started, and the time t2 is recorded; steps S3, after the error signal is stabilized at the S-shaped waveform center 0 point position, the time t3 is kept, the Q switch signal is turned on while the PID feedback control is turned off, the Q switch signal is kept for the time t4 and then turned off, and the digital quantity corresponding to the slope voltage at the moment is recorded; and steps S4, the slope voltage is controlled to drop to 0V, a period of time is kept, and the overall time of the step S4 is recorded as t5. The application has the characteristics of adjustable repetition frequency, high time stability and high frequency stability.

The present invention provides a low-noise broadband millimeter-wave frequency source based on multi-phase injection locking, which includes a multi-phase clock generation module and a multi-phase injection-locked frequency multiplier module; the differential input end of the multi-phase clock generation module is connected to the injection voltage signal of an external signal source; the multi-phase clock generation module is used to generate a plurality of voltage signals with different phases from the injection voltage signal of the external signal source and output them to the multi-phase injection-locked frequency multiplier module; the multi-phase injection-locked frequency multiplier module includes a resonant cavity, and the resonant cavity includes a in-phase coupling transformer, a in-phase coupling transformer and an anti-phase coupling transformer. The plurality of voltage signals with different phases are respectively converted into current signals and then divided into two groups of injection signal sources. The two groups of injection signal sources are respectively injected into the in-phase coupling transformer and the in-phase coupling transformer and then output through the reverse coupling transformer. This millimeter-wave frequency source can reduce harmonic spurs in the entire frequency band and improve the power of the output signal.

The application discloses a kind of commercial compatible OFDM concurrent backscatter communication method and device, belong to wireless communication field.The device of the present application includes excitation source, amplitude-frequency conversion module, narrowband detection module, amplitude signal decoding module, microprocessor, radio frequency switch array module and commercial OFDM receiving module.The present application introduces long-distance synchronization and backscatter transmission device based on injection locking technology at node, so that concurrent transmission node can efficiently detect downlink synchronization signal from excitation source, and simultaneously open backscatter communication within specified time.The present application uses commercial OFDM receiver to receive frequency domain signal, and converts it to time delay domain for processing, distinguishes backscatter signal from different nodes in time delay domain, and completes parallel decoding.The present application can use unmodified commercial OFDM receiver to receive and demodulate OFDM backscatter signal, significantly reduces the deployment complexity of concurrent backscatter system, improves the scalability and practicality of the present application.

Provided is a self-injection locking type laser device in which variations in environmental changes, optical path length, and resonator length are less likely to occur. The self-injection locking type laser device includes a first base plate, a second base plate, a temperature adjustment element disposed between the first base plate and the second base plate, a semiconductor laser light source disposed on the first base plate, a reference resonator disposed on the first base plate, located on an optical path of laser light emitted from the semiconductor laser light source, and including at least a first mirror and a second mirror for providing optical feedback to the semiconductor laser light source, a first cover covering the semiconductor laser light source and the reference resonator and in contact with the first base plate, and a second cover covering the first cover and in contact with the second base plate.

This invention discloses an injection-locked blue laser system, which injects a low-power, narrow-linewidth, and frequency-stable seed light into another high-power, wide-linewidth laser to obtain a high-power, narrow-linewidth, and frequency-stable laser. In this invention, by injecting a 5mW seed light, a 300mW slave light can be locked, and the system has a wavelength adjustment range of 6nm after locking. The main body of the laser system has a volume of 23×22×6cm. 3 After long-distance transport, it only requires adjustment of the internal fiber optic coupler to function normally. The advantages of this invention are: it realizes a portable, tunable 6nm wavelength, 300mW output power, low manufacturing cost, and easy-to-operate 480nm blue laser system. Furthermore, this injection-locking method can also be used in other optical bands, with the output power limited by the performance of the laser diodes within the laser system. This invention provides a new approach for the development of portable high-performance laser systems and has extremely high application value.

This invention discloses a low-phase-noise arbitrary waveform generation system based on an injection-locked optoelectronic oscillator. It utilizes a dual-polarization Mach-Zehnder modulator to simultaneously realize the injection-locked optoelectronic oscillator and optical domain frequency quadruple, enabling simultaneous microwave signal generation and signal frequency multiplication. The frequency bandwidth of the generated signal is not limited by the injected signal, thus realizing the generation of ultra-wideband signals.

The present invention relates to the field of semiconductor laser technology, specifically providing a tunable narrow-linewidth multi-wavelength laser based on injection locking. The laser comprises a light source, a beam splitter, a coupler, a photoacoustic frequency shifter, and a microring. The optical signal output by the light source is split into multiple sub-beams by the beam splitter. A photoacoustic frequency shifter and a microring are provided in the optical path of each sub-beam. The photoacoustic frequency shifter adjusts the frequency of the sub-beam, while the microring forms an injection-locked relationship with the light source, compressing the linewidth of the sub-beams. The sub-beams are then combined by a coupler, and finally a semiconductor optical amplifier is used for power amplification. By using the beam splitter, photoacoustic frequency shifter, and microring, the present invention enables a single light source system to output equally spaced multi-wavelength lasers, overcoming the drawbacks of traditional multi-light source designs.

The invention provides a broadband tunable narrow linewidth semiconductor laser device which comprises an FP (Fabry-Perot) laser diode and a photonic integrated chip, an input / output bus waveguide connected with the FP laser diode through an optical path, a micro-ring resonator and micro-heaters arranged on the bus waveguide and the micro-ring resonator respectively are integrated on the photonic integrated chip; and the optical fiber coupling output interface is used for outputting the on-chip laser to an optical fiber. Based on a chip-level laser platform covering a visible light band to a near-infrared band, an FP laser diode and a high-limit micron-scale silicon nitride ring resonator are mixed and integrated, and an innovative self-injection locking and double-micro heater phase control technology is utilized; a large tunable range and a narrow line width are realized on a millimeter-level chip.

An electronic oscillator circuit comprising: a tank circuit comprising an inductor and a capacitor, wherein the inductor and the capacitor each have a first terminal connected to a first side of the tank circuit and a second terminal connected to a second side of the tank circuit; a first current controller; and a second current controller; wherein the first current controller is connected to the first side of the tank circuit; wherein the second current controller is connected to the second side of the tank circuit; wherein the first current controller is arranged such that it can act as a current source for the tank circuit; wherein the second current controller is arranged such that it can act as a current sink for the tank circuit; wherein the first current controller and the second current controller are configured such that when the first current controller and the second current controller are in a first state, an injected current flows from the first current controller to the second current controller through the tank circuit; and when the first current controller and the second current controller are in a second state, no current is injected into the tank circuit. The injection of current in this way allows energy to be injected to the tank circuit, which forces oscillations in the tank circuit at a predetermined frequency different to the natural resonant frequency of the tank circuit.

The invention relates to a wireless circuit with optical frequency detection. An electronic device is provided with a wireless circuit. The wireless circuitry includes an optical mixer, a first laser and a second laser coupled to the optical mixer through a first optical path and a second optical path, a first optical resonator along the first optical path, a second optical resonator along the second optical path, and a third optical resonator along the second optical path. A phase-locked loop coupling the optical mixer to the first optical resonator; and a frequency-locked loop coupling an optical mixer to the second optical resonator. The first optical resonator and the second optical resonator may have optical resonant combs with different comb pitches, and the first laser and the second laser may be injection-locked. Once injection-locked, a control circuit may estimate the frequency of the optical signals output by the first laser and the second laser based on the beat frequency signal output by the optical mixer and based on the comb pitch of the first optical resonator and the second optical resonator. The wireless circuitry may perform or adjust wireless communications based on the estimated frequency.

The invention relates to the technical field of radio frequency integrated circuits, and particularly provides a low-power-consumption broadband injection locking frequency divider based on an S0I process, which comprises an oscillator circuit and an injection locking circuit, the oscillator circuit generates an oscillation signal; the injection locking circuit comprises an injection unit and a frequency tracking unit, the injection unit receives a plurality of injection signals, and the frequency tracking unit adjusts the phase of injection current; the injection locking circuit injects the adjusted injection current and injection signal into a differential output node and a common mode node of the oscillator circuit respectively, and the injection current and injection signal are mixed and coupled with an oscillation signal. According to the frequency divider, cooperative injection is carried out on the output node and the common-mode node of the oscillator circuit, the injection intensity is improved, meanwhile, the frequency tracking unit is introduced to achieve self-adaptive tracking of the injection frequency, the injection locking range of the frequency divider is remarkably widened while low power consumption is kept, the injection locking range can be adjusted in a self-adaptive mode, and the frequency divider is high in practicability. Therefore, the frequency drift of the millimeter wave frequency band is dealt with, and the robustness of the system is improved.

According to the present invention there is provided optical assembly (1) comprising. a laser (2) which is operable to emit light: an optical wave guide (3) having an input (3a) and an output (3b). the input (3a) of the optical wave guide (3) being optically coupled to the laser (2) so that the laser (2) can input light to the wave guide (3): a resonator (5) which is optically coupled to the wave guide (3) between the input (3a) of the wave guide (3) and the output (3b) of the wave guide (3): and wherein the resonator (5) has a resonant frequency. and wherein the resonator (5) defines an optical path (11): and wherein the resonator (5) is configured so that said optical path (11) is a closed loop: and wherein the resonator (5) is configured to have a periodic change in optical characteristics along said optical path (11) so that the resonator (5) can provide a backreflection which is at the resonant frequency of the resonator: and wherein the periodic change in optical characteristics along said optical path (11) provide an amount of said backreflection, which will provide a first detuning range in which self-injection locking of the laser using said backreflection is achieved, and. a second detuning range wherein a multifrequency comb can be generated within the resonator (5): and wherein the first and second ranges at least partially overlap, so that both self-injection locking of the laser will occur and an optical resonator-based multifrequency comb is output from the wave guide (3), when the assembly (1) is in operation. There is further provided a corresponding method of providing a optical resonator-based frequency comb at an output of a waveguide, using said assembly (1).

The invention discloses a free space coherent optical communication system and method based on optical frequency comb multi-mode extraction, and belongs to the field of free space coherent optical communication. The system comprises an optical frequency comb multi-mode extraction module, a free space coherent light communication transmitting module and a free space coherent light communication receiving module. According to the invention, the injection locking and optical phase-locked loop technology of the butterfly-shaped semiconductor laser is adopted, so that a plurality of ultra-narrow linewidth optical carriers can be extracted from the optical frequency comb locked to the ultra-stable cavity. The multi-mode high-stability optical carrier generation method and the real-time power fluctuation compensation method are adopted, and the communication quality of the free space coherent optical communication system is improved. Advanced modulation formats such as DP-QPSK and the like and higher modulation rate can be realized at a transmitting end, better anti-interference capability is realized in free space transmission, and optical signal receiving power stability is higher. And self-coherent detection is realized at a receiving end, the communication quality is improved, and digital signal processing algorithms such as frequency offset estimation are simplified.

Injection-Locked Digital Oscillator This description relates to an injection-locked digital oscillator (2). An adder (100) adds the first and second digital words (OP2, OP1) and provides a third digital word (RES) as a result, the words being N bits long, with N an integer strictly greater than 1. A register (102) updates the second word from the third word (RES) at each period of a clock signal (clk). A first circuit (200) receives a reference signal (REF) at a natural frequency of one output bit (OUT), and a reference increment, inc_ref. The first circuit calculates a first value (valref) that is selectively equal to and less than the reference increment inc_ref, depending on at least one state of the reference signal.The first circuit provides the first word at least in part by summing the first value and a positive control number, P, the output bit being a bit from the second word. Figure for the abbreviation: Fig. 2.

This invention provides a control method for a seed-injected single-frequency pulsed laser. By identifying the peak time and peak height of the resonant signal at the rising edge of the piezoelectric ceramic scanning voltage, predicting the peak value at the falling edge, and identifying the resonant signal voltage within the predicted peak time range, a trigger signal is issued when the resonant signal voltage exceeds a threshold voltage, thus achieving stable single-frequency pulsed laser output. This injection-locking method has a lower scanning voltage, resulting in higher lifespan and reliability for the piezoelectric ceramic. In other words, this invention solves the problems of high hardware cost, high scanning voltage, and low frequency stability in single-frequency pulsed lasers, enabling the output of high-energy single-frequency pulsed lasers with strong anti-interference capabilities and good frequency stability.

This invention provides a clock data recovery method and apparatus based on injection-locked oscillator. The method includes sampling an analog clock signal to obtain an initial sampled signal; detecting a clock error in the initial sampled signal to obtain a clock error signal; performing a first digital filtering process on the clock error signal to obtain a first clock control signal; acquiring a clock jitter estimate output from a digital filter within an injection-locked oscillator; injecting the clock jitter estimate into the clock error signal and performing a second digital filtering process; calculating a second clock control signal based on the clock signal after the second digital filtering process; and adjusting the phase of the sampled clock signal based on the first and second clock control signals. This invention also provides an apparatus for implementing the above method. The clock data recovery method of this invention has strong clock jitter tracking capability and low noise, and can be applied to next-generation communication technologies.

The invention belongs to the technical field of physical layer secure optical communication, and relates to a secure key distribution method based on a chaotic optical frequency comb, which is used for improving the security and speed of physical layer key distribution. According to the method, a micro-ring resonant cavity is adopted as an entropy source, random seed signals are injected into two groups of micro-rings with consistent structures by driving a seed module so as to realize injection locking, and the synchronous chaotic optical frequency comb is generated. After the chaotic optical frequency comb selects multiple paths of comb teeth through a filter, the randomness and parallelism of signals are enhanced by utilizing grating disturbance; and finally, the chaotic waveform is quantized into a binary key sequence through a photoelectric detector and a comparator, so that multi-path parallel security key distribution is realized. According to the method, multi-path parallel high-capacity distribution can be realized, and the security and efficiency of a key distribution system are remarkably improved.

The application relates to the field of integrated circuits, in particular to a multi-injection-locked ring wave oscillator, and a Doppler radar and a physiological characteristic detection device based on the ring wave oscillator. The ring wave oscillator comprises 16 inductive elements, 4 variable capacitors and 4 mirror injection circuits. The inductive elements are connected in sequence and are connected in a loop. Each two adjacent inductive elements form a phase-shifting channel and are distributed in four orthogonal directions in sequence. Two phase-shifting channels in each direction are parallel to each other and are located on the inner and outer sides of the same layer of the layout. The phase-shifting channels on the inner and outer sides in adjacent directions are connected alternately, and the wires between the phase-shifting channels are distributed on the upper and lower layers of the layout and have equal distances. The mirror injection circuit and the variable capacitor are connected between the two phase-shifting channels in each direction and output an injection signal with a phase difference of 180 DEG to the phase-shifting channels. The application solves the problems of the existing Doppler radar oscillator, such as limited injection locking range, high noise and insufficient phase uniformity.

The application discloses a kind of ultra-narrow linewidth laser generating device, the device includes optical self-injection locking loop and ultra-stable cavity phase-locked loop, optical self-injection locking loop improves the quality factor of laser resonator to narrow linewidth, ultra-stable cavity phase-locked loop locks the phase of light signal in optical self-injection, realizes laser frequency and optical resonator synchronization, further reduces the frequency noise of laser and improves the linewidth narrowing rate of laser by feedback control laser drive current;At the same time, due to the stable control of ultra-stable cavity phase-locked loop to laser frequency, the phenomenon of mode jump caused by laser frequency drift is also avoided, and the stability of the system is improved.Therefore, the device can provide stable narrow linewidth laser source for fiber communication, laser radar, industrial device processing, medical treatment and other fields.