16 results about "Injection locking" patented technology

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.

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.

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.

A first pump laser source produces a first pump optical signal at a first pump optical frequency v1P and launches it into a ring optical resonator to propagate in a forward direction around the ring optical resonator. A backscattered portion of the first pump optical signal propagates back to the first pump laser source and injection-locks it so that the first pump optical frequency v1P is locked to a first resonant mode optical frequency of the ring optical resonator. A second laser source producing a second pump optical signal at a second optical frequency v2P and can be similarly self-injection-locked to a second resonant mode optical frequency of the ring optical resonator different from the first resonant mode optical frequency.

This invention discloses a nitride single-transverse-mode dual-pass racetrack-shaped microring waveguide for the external cavity of a visible-light FP laser. It employs an AlN ridge waveguide system or a GaN strip waveguide system, achieving low-loss transmission of a single transverse mode in the visible-light band through precise control of waveguide cross-sectional parameters. The waveguide structure consists of two main straight waveguides and a racetrack-shaped microring waveguide forming a dual-pass coupling structure. The main waveguides are equally spaced on both sides of the microring straight track, forming three ports: input, pass-through, and download. This invention utilizes the dual-pass structure to feed back specific mode optical signals into the FP laser cavity, achieving self-injection locking and spectral purification. This invention features rigorous design logic and a compact structure, possessing significant monolithic integration application value in the fields of laser displays and precision atomic clocks.

This invention discloses a method and apparatus for evaluating the parasitic capacitance of an injection-locked circuit. The evaluation method includes: determining the device parameters of an LC resonator based on a target operating frequency range, and simulating the LC resonator with the device parameters applied to obtain a first simulation result; loading an injection structure at the first and second simulation interface terminals of the LC resonator to obtain a first circuit, simulating the first circuit to obtain a second simulation result, and adjusting the second simulation result based on the first simulation result to determine the first parasitic capacitance of the injection structure; loading a locking structure between the first and second simulation interface terminals of the first circuit to obtain a second circuit, simulating the second circuit to obtain a third simulation result, and adjusting the third simulation result based on the target operating frequency range to determine the second parasitic capacitance of the locking structure. Thus, this solution achieves accurate evaluation of the parasitic capacitance of the injection-locked circuit.

The embodiment of the application provides a kind of laser, optical module, concentrated light source module and optical communication system, it is related to laser technical field, for improving the stability of the output power and single frequency output of laser.The laser includes first laser unit, second laser unit and coupling device, wherein, first laser unit is used to generate first laser beam.Second laser unit includes second resonant cavity, second gain optical fiber and second pump source, second gain optical fiber is located in second resonant cavity, and second pump source is used to provide pump light for second gain optical fiber.Coupling device, coupling device is connected with first laser unit and second resonant cavity, for coupling first laser beam into second resonant cavity for injection locking;Coupling device also has the coupling end for the output of second resonant cavity.The above-mentioned laser can be applied to optical module, concentrated light source module and optical communication system.

A system and device for suppressing oscillator phase noise, comprising: an oscillator, and a self-injection locking loop and a self-phase locking loop for suppressing oscillator phase noise. A laser, a Mach-Zehnder modulator, at least two optical fiber delay lines of different lengths connected in sequence, two optical fiber delay lines connected to photodetectors, converting optical signals into electrical signals and entering the input end of a bridge, carrying out constructive interference and destructive interference in the bridge, and the output end of the bridge corresponding to generating a first interference signal and a second interference signal; the first interference signal output is fed back to the oscillator for self-injection locking; the second interference signal is mixed with part of the first interference signal and then output is fed back to the oscillator for self-phase locking; the self-injection locking loop and the self-phase locking loop of the application are combined to jointly suppress the phase noise of the oscillator.

The application relates to the technical field of integrated circuit design, and provides an adaptive injection-locked frequency divider, which directly injects a differential sine signal by using parallel double MOS tubes, and specifically comprises a frequency divider body, an injection strength detection module, a direct current bias point selection module and a power supply device which are electrically connected. The injection-locked frequency divider firstly connects a pair of differential sine signals output by a voltage-controlled oscillator to the input end of the injection strength detection module, and obtains a direct current voltage through the injection strength detection module; then according to the direct current voltage and a corresponding reference voltage, the strength of the connected differential sine signal is judged by using a preset number of comparators, and a corresponding direct current bias voltage is obtained through a digital logic gate; finally, the obtained direct current bias voltage is injected to the frequency divider body, and a frequency division signal is output, so that the adaptive adjustment of the direct current bias point according to the injection strength is realized, and the frequency division range is effectively widened.

A photonic integrated circuit-based dual frequency comb source, an integrated system for dual comb spectroscopy and corresponding method are disclosed. The dual comb source includes, on a same substrate of the photonic integrated circuit, a first and second semiconductor integrated mode-locked laser, a master laser, and connection arrangement between the master laser and each of the first and second mode-locked laser. The master laser is configured for generating a lasing line for simultaneous optical injection-locking of the first and second mode-locked laser, the first and second mode-locked laser are configured for generating a first and second frequency comb respectively, and the connection arrangement is suitable for coherently transferring lasing light from the master laser to each mode-locked laser. The mode-locked lasers include a gain section and a saturable absorber section to provide mode-locking, and an extended optical cavity formed in the substrate.

This application relates to the field of microwave photonics and discloses a novel frequency-tuned signal generation device based on an optical frequency-shifting loop. The optical frequency-shifting loop includes an optical switch, a cyclic frequency-shifting loop, and an injection-locking module. The optical switch is used to truncate the input single-frequency continuous light to generate periodic optical pulses, which are then output to the cyclic frequency-shifting loop. The cyclic frequency-shifting loop performs N cyclic frequency shifts on each period of the optical pulse, generating a frequency-tuned signal whose frequency continuously increases with the number of cycles. This frequency-tuned signal is then injected into the injection-locking module. The injection-locking module locks the frequency of the injected frequency-tuned signal, boosts its power to a target power, and outputs it. This solution addresses the problems of decreased signal flatness, reduced repeatability, and low power when generating large-bandwidth signals. It significantly improves the flatness and repeatability of the output signal from the optical frequency-shifting loop, providing a high-power, high-flatness frequency-tuned signal.

The application discloses a kind of microcavity optical comb device and driving method based on double-ring coupling structure, the device includes pump laser, main optical microcavity, auxiliary optical microcavity and tuning unit;Main optical microcavity generates dissipative kerr soliton optical frequency comb under the excitation of pump light, auxiliary optical microcavity is coupled with main optical microcavity, and is provided with periodic nanostructure thereon, backscattering is generated to pump light with frequency in the resonance bandwidth of pump mode, so that pump laser realizes self-injection locking;Coupling between auxiliary optical microcavity and main optical microcavity induces mode splitting at pump mode, and transmission of pump light from main optical microcavity is inhibited;Tuning unit is arranged on auxiliary optical microcavity, for adjusting the resonance frequency of auxiliary optical microcavity and the degree of mode splitting.The application can realize the robustness of self-injection locking and the high conversion efficiency of soliton optical comb simultaneously without damaging the high Q value characteristics of main microcavity.

This invention discloses a quantum state encoding device and method that does not require a long delay line. It utilizes random, minute radio frequency signals to modulate a laser to adjust the phase difference between pulse pairs, and simultaneously employs chopping to achieve a constant phase difference between the two laser pulses in the pulse pair. This eliminates the need for a long-delay interferometer or multiple lasers for injection locking, thus simultaneously satisfying the requirements of phase randomization between pulse pairs and a constant or specific phase difference between the two laser pulses in a pulse pair. Furthermore, this invention can be implemented using conventional lasers, intensity modulators, and phase modulators, facilitating chip integration and resulting in high yield and good stability.