84 results about "Injection locking" patented technology

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.

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.

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 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.

The application discloses a kind of self-injection locking laser based on single-sided film-coated monolithic resonator and its use method, belong to the technical field of semiconductor laser.The laser includes distributed feedback semiconductor laser, first temperature controller, first aspheric mirror, phase compensation medium, second temperature controller, second aspheric mirror, right-angle prism, monolithic resonator;The monolithic resonator includes non-coated optical plane, non-coated optical curved surface and coated optical plane.The application utilizes total reflection effect on two optical surfaces of monolithic resonator, so that no coating is needed on the two optical surfaces, only the third optical surface needs to be coated, thereby reducing the cost of coating.And on a totally reflected optical surface, through evanescent wave coupling, dynamic adjustment of coupling output transmittance of monolithic resonator can be achieved, and better linewidth compression effect can be obtained.

The invention discloses an underwater wireless optical communication transmitter based on a blue-green light phased array, and the transmitter comprises a narrow-linewidth seed laser source which is used for generating narrow-linewidth laser; the beam splitting device is used for splitting the narrow linewidth laser into a plurality of sub light beams; a blue-green laser diode array, each blue-green laser diode receives a path of sub-beam through an optical injection locking technology and outputs high-power narrow-linewidth blue-green laser, and the blue-green laser diode is based on a gallium nitride multi-quantum well structure; the phase control array corresponds to each blue-green laser diode and is used for adjusting the phase of each path of high-power narrow-linewidth blue-green laser; and the large-aperture transmitting antenna array is connected with the phase control array and is used for carrying out collimation processing on the laser beam after phase modulation and transmitting the laser beam to an underwater environment to form a large-aperture optical phased array. The device can significantly improve the power of emitted light beams, greatly improves the quality of the light beams, and improves the communication distance.

The application relates to the field of integrated circuit technology and discloses an injection-locked frequency multiplier circuit with an oscillator, which comprises the following: a differential mode resonant cavity for generating a fundamental wave signal and a third harmonic signal; a first oscillator unit connected with the differential mode resonant cavity and used for providing negative resistance; an injection unit connected with the differential mode resonant cavity, the injection unit being used for converting the fundamental wave signal and the third harmonic signal into a third harmonic component; a second oscillator unit used for providing negative resistance; and a fourth-order resonant cavity connected with the second oscillator unit and the injection unit and used for coupling the third harmonic component to be output. According to the application, the fundamental wave signal generated by the differential mode resonant cavity is converted into a triple-frequency output through the injection unit, the third harmonic signal is directly enhanced to be output, the third harmonic component output by the injection unit is coupled to be output through the fourth-order resonant cavity, the phase noise of the frequency multiplier is reduced, the energy efficiency is improved, and thus the demand of the local oscillator performance for millimeter wave high-speed wireless communication can be met.

A frequency multiplier includes a first ring oscillator, a second ring oscillator that is turned on complementarily to the first ring oscillator, a combining circuit that combines a first output signal of the first ring oscillator and a second output signal of the second ring oscillator to generate a final output signal, and a calibration circuit that corrects a discontinuous pulse included in the final output signal based on feedback of the final output signal.

The invention discloses a flat low-noise multi-wavelength laser generation system and method based on a Brillouin cavity. The system comprises a multi-wavelength pumping laser generation branch, a Brillouin optical fiber ring cavity and a frequency shift injection locking branch. The multi-wavelength pumping laser generation branch is used for generating and outputting flat multi-wavelength pumping laser and comprises a first distributed feedback laser, a first polarization controller, a first optical fiber circulator, a first multi-wavelength generator and a spectrum shaper; and the Brillouin optical fiber ring cavity is connected with the multi-wavelength pumping laser generation branch and the frequency shift injection locking branch through a second circulator, and is used for generating and finally outputting multi-wavelength Brillouin laser. The invention generates multi-wavelength laser with the advantages of low noise, flat spectrum and the like, and is suitable for application scenes of low-phase noise signal generation, high-dynamic range signal processing and the like in a microwave photon system.

A wireless power system includes a magnetic resonance wireless power supply with a plurality of coupled LC resonators, each LC resonator being driven by a separate radio frequency (RF) generator. The system is modular, allowing the resonator to be added, removed, or repositioned. Each RF generator is configured to sense the phases of the other RF generators and adjust their phases to maintain a constant phase difference. Each RF generator includes a class E amplifier driven by an injection locked oscillator and a low pass filter that outputs a current sine wave. The RF generator senses the phase of the RF current of the other RF generators through the induced voltage and adjusts its phase based on a sum voltage derived from the voltage signal and the current signal. The system maintains frequency locking by adjusting a variable capacitor in the presence of environmental detuning.

The application discloses a chipped wavelength standard device and a preparation method thereof, and belongs to the field of wavelength standards. The device comprises a frequency discrimination module, a pumping module, a locking module and a substrate. The frequency discrimination module comprises a MEMS atomic gas chamber, a micro-ring resonant cavity and a photodetector; the pumping module mainly comprises a laser and a control circuit thereof; the locking module comprises a phase-locked amplifier, a reference signal source and a PID circuit. The substrate comprises a copper or ceramic heat sink and a TEC temperature controller. The application combines the micro-ring resonant cavity and the MEMS atomic gas chamber, directly pumps the micro-ring resonant cavity integrated optical path by the laser, locks the laser wavelength on the micro-ring resonant cavity resonance peak based on the micro-cavity self-injection locking method, reduces the laser noise and realizes the laser linewidth compression. The micro-cavity evanescent field excites the atomic transition in the atomic gas chamber, and the frequency is discriminated by detecting the fluorescence. The laser frequency is locked by controlling the laser current and the micro-cavity temperature through the frequency discrimination signal, and the chip-level wavelength metrology and value traceability are realized.

The invention discloses a dual-core quadrature LC oscillator circuit and module, and relates to the technical field of quadrature LC oscillators. According to the invention, a master-slave dual-core design is adopted, the output of the quadrature phase is realized through a mutual injection locking mode, the number and power consumption of oscillators are effectively reduced, and the layout area of the circuit is reduced. According to the invention, on one hand, the negative resistance unit of the noise circulation structure is connected with the resonant cavity, so that a part of thermal noise generated by the transistor can circulate in the negative resistance unit under the condition that the negative resistance is not changed to reduce the amount of noise entering the resonant cavity, and on the other hand, phase shift is carried out on an injected signal by adopting a passive phase shift network technology; noise influence generated by an active device is directly avoided physically, so that the total noise amount injected into the resonant cavity is reduced, and the phase noise of the oscillator is effectively optimized.

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 discloses a self-injection locking microcavity soliton frequency comb generation system and method. The soliton generation system comprises a laser, a micro-ring resonant cavity chip, a phase shifter and a control circuit. The laser is used for providing pump light for the micro-ring resonant cavity chip; the phase shifter is arranged in the micro-ring resonant cavity chip and is used for adjusting the phase of the pump light entering the micro-ring resonant cavity; and the control circuit is used for controlling the laser and the phase shifter according to an output signal of the micro-ring resonant cavity chip so as to realize generation of a soliton frequency comb in the micro-ring resonant cavity. The scheme of the invention not only effectively improves the precision and efficiency of soliton frequency comb generation, but also significantly enhances the automation level and engineering availability of the system, and provides technical support for large-scale and stable output of soliton frequency combs in practical application.

A photonic system is described that employs, e.g., a first laser generating a first optical beam at a first wavelength and a second laser generating a second optical beam at a second, different wavelength. The photonic system also includes a resonator, e.g., a whispering gallery mode (WGM) resonator, configured to receive a portion of the first optical beam and a portion of the second optical beam. The first laser is locked to a first mode of the resonator using either self-injection locking (SIL) or Pound-Drever-Hall (PDH) locking. The second laser is also locked to a second mode of the resonator using either SIL or a PDH. The first and second wavelengths (frequencies) may differ from one another by a few gigahertz (GHz) or, e.g., larger than 10 terahertz (THz). The system thus allows diverse wavelengths to be locked to one another.