69 results about "Injection locked" patented technology

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

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

The 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.

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 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.

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 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.

The present application discloses a quantum state encoding device and method without a long delay line. The device and method use a random minute radio frequency signal to modulate a laser to achieve phase difference adjustment between pulse pairs, while simultaneously employing chopping to achieve a constant phase difference between two laser pulses of a pulse pair. Thus, without the aid of a long delay line interferometer or multiple lasers used for injection locking, the requirements for phase randomization between pulse pairs and a constant or specific phase difference between the two laser pulses in each pulse pair can be simultaneously satisfied. In addition, the present application can be implemented by means of conventional lasers, intensity modulators, and phase modulators, facilitating chip integration and achieving high yield and good stability.

This invention discloses a narrow-linewidth fiber laser system based on a self-injection locked feedback mechanism, belonging to the field of fiber optic communication. The system includes a main cavity, a self-injection locked feedback module, and an erbium-doped fiber amplifier. The main cavity internally includes a composite ring cavity filter for selecting longitudinal modes. This composite ring cavity filter is sequentially connected to a polarization controller, a first erbium-doped fiber, a first wavelength division multiplexer, a second erbium-doped fiber, and a first uniform fiber grating via a first circulator. The output of the first uniform fiber grating is connected to the input of a first fiber coupler. One output of the first fiber coupler is sequentially connected to a fiber delay line and a Faraday rotator in the self-injection locked feedback module, with the Faraday rotator rotating at a 90° angle. The other output of the first fiber coupler is connected to the input of the erbium-doped fiber amplifier. Through this structure, the present invention improves the stability of the laser system.

The invention discloses a method for realizing information frequency conversion and distribution based on a superconducting frequency comb coherent injection locking phenomenon. A superconducting microwave frequency comb coherent injection locking phenomenon is utilized to simultaneously generate a plurality of amplitude modulation, frequency modulation or phase modulation signals with different carrier frequencies and the same modulation signal from one amplitude modulation, frequency modulation or phase modulation signal. According to the method, information can be received in a wide microwave frequency band, the information is synchronously converted into multiple frequencies in real time, and frequency conversion and distribution of the information are achieved at low temperature with extremely low power consumption. Compared with a frequency mixing scheme, a local oscillator signal does not need to be added, and high integration at low temperature is facilitated. The method is suitable for information frequency conversion of a plurality of narrow frequency bands with large frequency spans and has certain frequency selectivity, and the applicable frequency bands of the method can be accurately controlled by using superconducting microwave frequency combs with different fundamental frequencies. Information can be distributed to a plurality of different frequency bands at the same time, and the method is used for real-time synchronous transmission of information among systems of a plurality of different working frequency bands.

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 application discloses a kind of based on CPT effect microcavity double optical comb frequency stabilization device, two self-injection locking microcavity optical comb are used to obtain microcavity double optical comb, and microcavity double optical comb pump light source is locked;The repetition frequency of double optical comb is independently controlled by the way of radio frequency injection locking;Utilize microcavity double optical comb vernier effect, obtain the double optical comb comb teeth pair that can stimulate CPT effect, utilize atomic absorption peak to generate comb teeth frequency discrimination signal, feedback to pump light, so that pump light reference to the Doppler absorption peak of atom;The repetition frequency of one optical comb is referenced to comb teeth beat signal, and frequency discrimination signal is generated using CPT effect, and the repetition frequency of another optical comb is locked, so that the frequency difference of double optical comb comb teeth pair is locked to CPT resonance peak.The application can compensate the frequency difference between microcavity optical comb repetition frequency and microwave atomic frequency stabilization frequency by double optical comb vernier effect, realize the integration and miniaturization of frequency stabilization system, reduce the complexity of frequency stabilization system.

Provided is method for injection locking a first laser onto a second laser, the method comprising the steps of: a) providing at least part of light emitted by the first laser to the second laser; b) continuously changing an input parameter of the second laser until a value at which a signal of the second laser shifts is reached; c) adding the value at which the signal of the second laser shifts to a set of values; d) repeating steps b) and c) until the set of values converges to a convergence value; and e) setting the input parameter of the second laser based on the convergence value, thereby injection locking the first laser onto the second laser.

The invention discloses a modular communication PCB (Printed Circuit Board) splicing structure, which comprises two fixed frames which are spliced in an aligned manner, PCBs are positioned, clamped and spliced at the tops of the two fixed frames, and a pin connector is arranged between seams of the PCBs at the two sides; a glue injection locking assembly is arranged on the splicing surface of the first fixing frame, a clamping groove is formed in the splicing surface of the second fixing frame, and the glue injection locking assembly comprises a movable clamping part which is correspondingly clamped with the clamping groove; a pressing locking mechanism is arranged at the edge of the top of the fixing frame, and the pressing locking mechanism presses and positions the top of the PCB downwards; according to the invention, rapid and accurate butt joint between the two PCBs can be realized, and adverse effects on the butt joint of the PCBs caused by external mechanical lineup and thermal expansion and cold contraction of parts can be effectively reduced.

The present application belongs to the field of optical fiber sensing technology, and particularly relates to a phase-sensitive distributed optical fiber temperature measuring device and method based on a tunable laser, which comprises a tunable laser, a pulse modulation module, a sensing module and a temperature measuring module, and is characterized in that: the tunable laser is used to calibrate different absolute temperatures corresponding to different center wavelengths by using the variable wavelength characteristics of the tunable laser, and the actual temperature to be measured is demodulated through a correlation demodulation module and a temperature calibration module; the injection locking technology is adopted to eliminate the wavelength drift problem of the tunable laser, suppress the harmonics generated in the frequency sweeping light modulation process of the tunable laser, and improve the measurement accuracy of the system. The present application solves the problem that the phase-sensitive optical fiber measurement method cannot measure the absolute temperature, and can be widely used in the field of high-precision distributed optical fiber temperature measurement.

The invention relates to an injection laser automatic frequency stabilization device and method based on cold atom imaging feedback. The device comprises a primary cooling light path, a secondary cooling light path, a charge-coupled device and a control module. The first-stage cooling light path and the second-stage cooling light path are used for outputting single longitudinal mode laser by using the seed laser, injecting the single longitudinal mode laser into the plurality of injection lasers and then outputting cooling laser into the vacuum system; the charge-coupled device is used for acquiring a cold atom cloud image in the magneto-optical trap of the vacuum system in real time; the control module is used for automatically locking the plurality of injection lasers to a single longitudinal mode state according to the brightness of the cold atom cloud image and a preset sequence; and according to the brightness change of the cold atom cloud image, judging the injection laser which is unlocked and re-locking the injection laser. The problems that a traditional injection locking system is large in size, insufficient in automation, dependent on manpower, poor in environmental adaptability and the like are solved.

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

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 relates to the technical field of integrated circuits, and discloses an injection locking frequency multiplier circuit with an oscillator, and the circuit comprises a differential mode resonant cavity which is used for generating a fundamental wave signal and a third harmonic signal; the first oscillator unit is connected with the differential mode resonant cavity and is used for providing negative resistance; the injection unit is connected with the differential mode resonant cavity, and the injection unit is used for converting the fundamental wave signal and the third harmonic signal into a third harmonic component; the second oscillator unit is used for providing negative resistance; and the fourth-order resonant cavity is connected with the second oscillator unit and the injection unit and is used for coupling and outputting the third harmonic component. According to the frequency multiplier, fundamental wave signals generated by the differential mode resonant cavity are subjected to triple frequency output through the injection unit, third harmonic signals are directly output in an enhanced mode, third harmonic components output through the injection unit are output through coupling of the fourth-order resonant cavity, the phase noise of the frequency multiplier is reduced, and the energy efficiency of the frequency multiplier is improved; therefore, the requirement of millimeter wave high-speed wireless communication on local oscillator performance can be met.

A circuit includes an injection locking oscillator circuit and a sense circuit. The injection locking oscillator circuit has an input and an output. The sense circuit includes a sampling circuit and a comparator. The sampling circuit has a first input coupled to the input of the injection locking oscillator circuit, a second input coupled to output of the injection locking oscillator circuit, and an output. The comparator has an input coupled to the output of the sampling circuit, and an output.

The utility model relates to pen type injection device technical field especially, a kind of residual amount monitoring and locking structure and injection device;Including shell, push rod, clutch, drive rod, limit ring, termination ring and dose setting ring, shell inside fixedly connected limit ring, limit ring inside cover clutch, clutch is away from the end part of limit ring and set termination ring, drive rod is set in shell inside, drive rod one end projects shell, push rod is set in drive rod inside, push rod one end projects drive rod, push rod that projects drive rod passes through termination ring, clutch and limit ring in proper order;Dose setting ring is set in shell end part, dose setting ring is engaged with drive rod and set;Termination ring reciprocates along the axial direction of push rod, for the residual amount monitoring of realizing injection liquid medicine;Push rod termination surface is set on termination ring, injection termination surface is set on push rod, when push rod termination surface and injection termination surface contact, injection locking is carried out;Realize locking function after injection, realize residual amount monitoring function.

The invention discloses a power generation and injection locking synthesis system and an adjustment method, and belongs to the technical field of radio frequency and microwave power. The power generation and injection locking synthesis system comprises an external signal source, N power units, a power synthesis network and a dynamic adjustment module. The external signal source is connected with the output ends of the N power units, provides a unified reference signal and injects the reference signal into each power unit; the power synthesis network is connected with the output ends of the N power units and superposes output signals of the N power units into one path of signals, one part of the signals are output as high power, and the other part of the signals are sent to the dynamic adjustment module through the directional coupler; and the dynamic adjusting module detects the output of the power synthesis network through the directional coupler and the output of the N power units through the directional coupler in real time, and adjusts the power and phase of each power unit according to the power and phase detected in real time, so that the power and phase of each power unit are kept consistent.