78 results about "Vernier effect" patented technology

A laser distance ranging method includes splitting two combs of dual comb radiation into a signal radiation portion and a local oscillator radiation portion. The signal radiation portions are, after separation, combined into a combined signal radiation and directed onto an object, the distance to which is to be measured. The signal thrown back from the object is split into a first and second signal portions. The first signal portion is superimposed with the second local oscillator radiation portion to generate a first measurement signal, and the second signal portion is superimposed with the first local oscillator radiation portion to generate a second measurement signal. The distance to the object is determined from the first and second measurement signals, and from reference signals obtained by the partial reflection, wherein the Vernier effect can be used to extend ambiguity by comparison of the first and second measurement signals.

The invention belongs to the technical field of optical communication, and particularly relates to a narrow linewidth laser based on a cascaded micro-ring resonant cavity. The laser comprises a semiconductor laser inner cavity module, a gain chip module, a phase shifter, a cascade micro-ring resonant cavity module, a thermal tuning module and an outer cavity reflector. The gain chip is combined with an III-V group material at the top of the silicon waveguide through heterogeneous integration, and adopts an InAlGaAs quantum well to provide high gain; the phase shifter is used for matching the lasing wavelength with the resonant wavelength; the cascaded micro-ring resonant cavity is formed by cascading three micro-rings, and tuning of the laser is realized based on a vernier effect; the thermal tuning module is composed of three semi-annular metal strips and a straight waveguide-shaped metal strip. The outer cavity reflector module adopts a Sagnac ring structure; the laser inner cavity, the gain chip, the cascade micro-ring resonant cavity and the outer cavity reflector are directly connected through silicon waveguides. The laser has the characteristics of narrow linewidth and wide tuning range, is easy to highly integrate and interconnect, and has important application value.

The invention discloses a high-sensitivity double Fabry-Perot interference hydrogen sensor resistant to temperature and humidity interference, and belongs to the technical field of optical fiber sensing. A modular integrated design is adopted, and the core comprises double Fabry-Perot interferometers which are connected in series and are respectively a temperature compensation unit FPI-1 and a hydrogen sensing unit FPI-2, and a matched software controllable vernier processing module; the FPI-1 realizes temperature real-time compensation by filling PDMS in an open microcavity, and the FPI-2 adopts a PDMS / Pd-WO3 composite material as a hydrogen sensitive layer, and has wide humidity range anti-interference capability through structural optimization; the weak hydrogen signal is amplified through Fourier transform filtering, sine function fitting, twin interference spectrum construction and vernier effect. According to the invention, precise detection of ultra-trace hydrogen in a complex temperature and humidity environment is realized, and the temperature and humidity interference resistance is high.

The invention relates to an optical radiation source. It is an object of the invention to enable the generation of laser radiation with (ultra) narrow linewidth and to provide an optical radiation source which is robust and simple to control. The optical radiation source of the invention comprises: a laser source having a gain medium and an internal cavity configured to generate laser radiation at multiple frequencies separated by a first free spectral range, at least one external cavity in optical communication with the laser source, the external cavity having a plurality of resonance modes within the gain bandwidth of the laser source, wherein the resonance modes are separated by a second free spectral range which is different from the first free spectral range, wherein the external cavity is configured to act as a frequency-selective reflector to selectively reflect laser radiation generated by the laser source back into the gain medium, thereby causing the gain medium to lase predominantly at only one frequency, and wherein the optical radiation source is configured to couple a portion of the generated laser radiation out from the internal cavity and / or from the external cavity.

The invention relates to the technical field of optical fiber sensors, in particular to a double-parameter optical fiber sensor based on a double interference effect and a preparation method thereof.The sensor comprises a sensing unit 5 based on a Fabry-Perot interferometer and a sensing unit 6 based on a Mach-Zehnder interferometer, and the two sensing units form a cascade structure; mutual reference probes can be realized when different parameters are measured; according to the invention, an approximate free spectral range is obtained by controlling the cavity length, a remarkable vernier effect is formed, the air pressure and temperature sensitivity can be calculated by tracking the drift of the envelope, the measurement accuracy can be effectively improved, and the device has the advantages of simple structure and small volume.

The present invention discloses a method for manufacturing an optical fiber magnetic field sensor composed of Terfenol-D powder and FPI. The method comprises the following steps: a first step of manufacturing a Fabry-Perot interferometer 1 (FPI1); a second step of uniformly coating the Terfenol-D powder on the surface of a large capillary of the FPI1 to form the FPI1 that is sensitive to a magnetic field; a third step of manufacturing a Fabry-Perot interferometer 2 (FPI2); and a fourth step of fusing the single-mode optical fiber ends of the FPI1 and the FPI2 together using a fusion splicer, with the two FPIs spaced 5 mm to 1 cm apart. The two FPIs are cascaded to form a first harmonic vernier effect sensor. The method of the present invention absorbs the advantages of existing sensors and overcomes their disadvantages. By utilizing a quartz capillary, a single-mode optical fiber, Terfenol-D powder, epoxy resin glue, ultraviolet glue, the FPI, and the first harmonic vernier effect, a compact optical fiber magnetic field sensor can be manufactured, which is easy to manufacture, easy to package, and highly sensitive. The sensor is suitable for measuring magnetic fields in confined spaces and has excellent practical application value.

The application belongs to the technical field of optical communication and relates to a frequency-shift-free microwave photonic channelized receiving device, which comprises a carrier light frequency comb generating unit, a local light frequency comb generating unit, an electro-optical modulation unit, an optical phase shift unit, a channel selection and spectrum processing unit and a plurality of photoelectric conversion units. The received broadband radio frequency signal is modulated on each comb tooth of the carrier light frequency comb through the electro-optical modulation unit, and the frequency alignment between the optical local oscillator and the required receiving sub-channel can be realized based on the "vernier" effect caused by the different free spectral ranges of the carrier light frequency comb and the local light frequency comb and the inherent frequency alignment of the same pump laser. The mirror image sub-channel suppression is realized based on the opposite optical phase shifts on both sides of the pump light. The application has a simple structure, omits the frequency shift and special modulation structure required for frequency alignment, effectively suppresses the inter-channel crosstalk problem in the channelized receiving process, and can flexibly increase the channelization quantity according to actual needs.

The present invention provides an optical fiber microcavity humidity sensor and a manufacturing method thereof. The optical fiber microcavity humidity sensor includes a silicon wafer, a moisture-sensitive material layer, a single-mode optical fiber and a sensor housing. The moisture-sensitive material layer is sputtered on the inner surface of the silicon wafer, and a silicon wafer cavity is formed between the moisture-sensitive material layer and the outer surface of the silicon wafer; the single-mode optical fiber extends toward and does not contact the moisture-sensitive material layer, and an air cavity is formed between the protruding end face of the single-mode optical fiber and the moisture-sensitive material layer; the sensor housing includes a first support platform for fixing the moisture-sensitive material layer and a second support platform for fixing the single-mode optical fiber, the single-mode optical fiber is passed through the second support platform and extends toward the first support platform, and is used to form the air cavity between the protruding end face of the single-mode optical fiber and the moisture-sensitive material layer; wherein the air cavity and the silicon wafer cavity are constructed into a cascade structure to achieve amplification of the sensor sensitivity by the optical vernier effect.

The invention discloses a vernier effect-based high-sensitivity double-dislocation optical fiber temperature sensor, which comprises an input optical fiber, a first dislocation optical fiber, a second dislocation optical fiber, an output optical fiber and a polymer microsphere which are connected in a dislocation manner, one end of the input optical fiber and one end of the first staggered optical fiber are welded in a staggered manner, and a first staggered welding surface is formed therebetween; the other end of the first staggered optical fiber and one end of the second staggered optical fiber are welded in a staggered manner to form a second staggered welding surface; the other end of the second dislocation optical fiber is in dislocation welding with one end of the output optical fiber to form a third dislocation welding surface; and the polymer microspheres are wrapped on a staggered cavity between the second staggered welding surface and the third staggered welding surface. According to the optical fiber temperature sensor, the staggered optical fiber pairs of the two Mach-Zehnder interferometers are formed, one staggered optical fiber is coated with the polymer, and therefore the vernier effect is achieved, and the optical fiber temperature sensor has the advantages of being high in temperature measurement sensitivity, easy to prepare and low in cost.

The application discloses a fiber refractive index sensor based on a vernier effect, which comprises a broadband light source, an isolator, a first fiber ring resonant cavity, a second fiber ring resonant cavity, a refractive index sensitive unit, a spectrum analysis module and a data processing unit; the input end of the isolator is connected with the output end of the broadband light source; the input end of the first fiber ring resonant cavity is connected with the output end of the isolator; the input end of the second fiber ring resonant cavity is connected with the output end of the first fiber ring resonant cavity; the first fiber ring resonant cavity and the second fiber ring resonant cavity constitute a cascaded fiber ring resonant cavity; the refractive index sensitive unit is connected into the second fiber ring resonant cavity; the input end of the spectrum analysis module is connected with the output end of the second fiber ring resonant cavity; and the input port of the data processing unit is connected with the output port of the spectrum analysis module. The application has the characteristics of high sensitivity, simple structure, high demodulation precision and suitability for mass production.

The invention discloses an optical time delay calibration method of a broadband phased array. According to the method, the defect that a traditional optical time delay measurement method is only limited to a single measurement domain such as a time domain, a frequency domain or a phase domain is overcome, resources of multiple dimensions such as the time domain, the frequency domain and the polarization domain are reused, and the optical time delay measurement accuracy is improved based on the constructed optical domain vernier effect. By solving an indefinite equation formed by two optical pulse sequences in different polarization states, the measurable range of the optical time delay in a high-speed measurement scene is extended. The invention also discloses an optical time delay calibration device of the broadband phased array. Compared with the prior art, large-range, high-precision, multi-channel and rapid time delay measurement and calibration can be realized.

Permanent magnet synchronous joint motor, magnetic encoder and angle detection method, relate to motor angle detection technical field. The magnetic encoder contains a magnetic encoder module and an AMR sensor array. The magnetic encoder module is suitable for being installed at the motor shaft end. The magnetic encoder module includes coaxially arranged outer ring magnet and inner ring magnet. The absolute value of the difference between the pole pairs of the outer ring magnet and the inner ring magnet is 2. The AMR sensor array is suitable for being arranged in the magnetic field action area of the outer ring magnet and the inner ring magnet. The AMR sensor array includes two AMR sensors located on the same radius line of the magnetic field action area. Two AMR sensors correspond to the magnetic field area of the outer ring magnet and the inner ring magnet respectively, and are used for synchronously collecting the signals of the respective corresponding magnetic ring. The signals are suitable for realizing high-resolution detection of single-turn absolute angle through double-ring vernier effect and disambiguation algorithm.

The present invention discloses a watt-class linear cavity single-frequency fiber oscillator based on dynamic refractive index grating regulation. The oscillator comprises two sections of active optical fiber, which are pumped by two pump sources respectively. The two sections of active optical fiber fully absorb the pump power while still retaining unpumped portions. The standing wave effect in the linear cavity laser generates narrowband refractive index modulation gratings in the unpumped portions of the two sections of active optical fiber. Therefore, the two sections of active optical fiber serve as gain media to provide laser gain and as saturable absorbers to produce a frequency selection effect. The narrowband refractive index modulation gratings in the two sections of active optical fiber form a vernier effect, which enhances frequency selection and ensures that the power output level of the single-frequency fiber oscillator reaches the watt level.

The invention discloses a vernier effect-based high-sensitivity polymer micro-ring temperature and humidity optical waveguide sensor, and belongs to the technical field of planar optical waveguide integrated devices. The polymer electrolyte consists of a substrate layer, a polymer lower cladding, a polymer grooving layer, a polymer electrolyte core layer and a polymer upper cladding. The polymer electrolyte core layer is of a runway type MRR cascaded optical waveguide structure and is composed of a reference ring, a temperature sensing ring and a humidity sensing ring, a polymer electrolyte core layer material can adsorb water molecules in air, the free ion concentration can change along with the change of humidity and temperature, and then the refractive index of the material changes; the temperature and humidity dual-mode sensing device overcomes the defects of integration level, sensitivity and interference resistance of an existing temperature and humidity sensing device, ultra-compact and ultra-high-sensitivity temperature and humidity dual-mode sensing is achieved, the optical waveguide device is made of polymer materials, and the temperature and humidity dual-mode sensing device has the remarkable advantages of being good in flexibility, simple in process, low in cost, high in efficiency and the like. The method is suitable for various scenes requiring precise environment control or real-time monitoring of tiny changes.

This invention belongs to the field of fiber optic sensing application technology, specifically relating to a high-sensitivity air microbubble strain sensor based on the vernier effect and its fabrication method. The sensor consists of a parallel microbubble sensing cavity Fabry-Perot interferometer and an air reference cavity Fabry-Perot interferometer. The microbubble sensing cavity Fabry-Perot interferometer is made by fusion splicing two single-mode optical fibers, with an ellipsoidal microbubble embedded at the center of its conical region. The air reference cavity Fabry-Perot interferometer is made by fusion splicing two single-mode optical fibers through a hollow capillary tube, with the two single-mode fiber segments forming an air cavity within the capillary tube. When the microbubble sensing cavity and the air reference cavity are connected in parallel, their signals overlap, resulting in an envelope modulation effect. Compared to using the microbubble sensing cavity alone, this significantly amplifies the sensitivity, improves the sensor's sensing performance, and achieves high-sensitivity air microbubble strain sensing.

This invention discloses an alcohol detection chip and detection method based on a cascaded dual-ring resonator with dual-gradient curvature, belonging to the field of optical micro-nano sensing and integrated optics technology. This invention aims to solve the technical problems of low sensitivity, poor resolution, complex spectral analysis, and weak environmental adaptability in traditional micro-ring sensing devices, as well as the low detection accuracy of existing miniaturized equipment. The chip uses a silicon-based substrate and includes input and output waveguides, cascaded dual micro-rings, a coupling region, and two sets of miniature heating electrodes. The micro-rings employ dual-gradient waveguides with circular and Euler-circular curved structures for the inner and outer curves, respectively. The cascaded dual rings create a vernier effect, broadening the free spectral range. By adjusting the resonant wavelength through the heating electrodes, scanning detection is completed in the characteristic alcohol band around 1400nm, and high-precision alcohol measurement is achieved by combining transmission spectroscopy. This invention has a compact structure and low cost, and is suitable for rapid quantitative detection of alcohol in industrial monitoring, vehicle safety, food safety, and other scenarios.

The invention belongs to the technical field of temperature detection, and particularly relates to an enhanced vernier effect optical fiber temperature sensor, a preparation method thereof and a temperature sensing system. The invention provides an enhanced vernier effect optical fiber temperature sensor, which comprises a Fabry-Perot interferometer and a Liushu interferometer, and the Fabry-Perot interferometer and the Liushu interferometer are connected in parallel. The Fabry-Perot interferometer comprises a single-mode optical fiber and a hollow optical fiber fixedly connected with the single-mode optical fiber, and a cavity of the hollow optical fiber is filled with polydimethylsiloxane; the Liusu interferometer comprises an optical fiber polarizer and a second polarization maintaining optical fiber fixedly connected with a first polarization maintaining optical fiber of the optical fiber polarizer. The enhanced vernier effect optical fiber temperature sensor provided by the invention is simple in preparation process and can realize batch production; and moreover, the bandwidth utilization rate is higher, the sensitivity is higher, and the ultra-high-sensitivity use scene can be met. And high-sensitivity temperature monitoring can also be realized when the equipment condition is relatively poor. And the use threshold of the vernier sensor is obviously reduced.

The invention belongs to the technical field of temperature sensing, and particularly relates to an optical fiber temperature sensor based on a double-FP parallel structure, which is characterized in that the optical fiber temperature sensor is formed by connecting a reference interferometer and a sensing interferometer in parallel, the reference interferometer is composed of a first single-mode optical fiber, a hollow-core optical fiber and a second single-mode optical fiber, and the sensing interferometer is composed of a second single-mode optical fiber and a third single-mode optical fiber. The sensing interferometer is composed of a third single-mode fiber, a PDMS cavity and a fourth single-mode fiber. Wherein the optical path lengths of the PDMS cavity and the hollow-core optical fiber are controlled to be close to each other but not equal to each other, so that the free spectral range of the sensing interferometer is close to each other but not equal to the free spectral range of the reference interferometer, and the vernier effect of an output spectrum is excited to form an envelope formed by fine stripes. The optical fiber temperature sensor has the advantages of being high in sensitivity and linearity, large in detection range, good in repeatability and good in reversibility, meanwhile, the size of the optical fiber sensing probe is in the micron dimension, and the optical fiber temperature sensor is suitable for temperature detection in a narrow space.

The invention discloses a vernier effect reconstruction-based signal processing method and related equipment, and the method comprises the steps: carrying out the cascading processing of an optical fiber core offset pair and a micro-nano optical fiber, obtaining a vernier effect optical fiber sensor, inputting a to-be-detected signal into the vernier effect optical fiber sensor, and obtaining an output signal, and performing vernier effect reconstruction processing on the output signal to obtain a reconstructed vernier envelope, and performing parameter measurement processing on the signal to be measured according to the reconstructed vernier envelope to obtain a measurement result. The embodiment of the invention can improve the measurement efficiency of the sensor, and can be widely applied to the technical field of data processing.

The invention provides a wooden ancient building multi-defense-area intrusion and fire danger integrated monitoring system, and belongs to the technical field of distributed optical fibers. The system comprises a broadband light source, laser emitted by the broadband light source is divided into two paths after passing through a first 1 * 2 coupler, the two paths of laser are input into two composite structure light paths respectively, each composite structure comprises an annular Sagnac interference structure and an MZ type interference structure which are parallel to each other, the annular Sagnac interference structures are used for monitoring the temperature in an arranged defense area, and the MZ type interference structures are used for monitoring the temperature in the defense area. Intrusion vibration events around the ancient building are monitored through an MZ type interference structure; according to the system, a Sagnac structure and an MZ structure are multiplexed in parallel, the vernier effect is ingeniously utilized, function integration on a single sensing optical fiber is achieved, and material consumption and installation complexity are remarkably reduced; besides, the panda type polarization maintaining optical fiber is integrated in the annular Sagnac structure, and the MZI made of the tapering single-mode optical fiber is combined, so that the sensitivity of temperature sensing and perimeter security protection is greatly improved, and the high-standard requirement of security protection of ancient buildings is met.

The utility model discloses a polydimethylsiloxane sensitization optical fiber temperature and strain simultaneous measurement sensor. The sensor comprises an incident optical fiber, an optical fiber coupler, an optical fiber patch cord, a transmission optical fiber, a sensing cavity, a reference cavity and an emergent optical fiber, an optical signal enters the optical fiber coupler through the incident optical fiber and is divided into two beams of equal-intensity light in the coupler, the two beams of light are respectively input into the transmission optical fiber through the optical fiber patch cord and then enter the sensing cavity and the reference cavity which are coated with the polydimethylsiloxane, and the light is reflected by the cavities to form interference; the interference light is transmitted back to the optical fiber coupler through respective transmission optical fibers, so that a vernier spectrum is formed; the emergent optical fiber transmits an optical signal containing temperature strain information to a spectrograph, trough drift is analyzed through a dual-wavelength matrix demodulation method, and simultaneous measurement is achieved. According to the utility model, the vernier effect, the structural advantages of the Fabry-Perot interferometer and the advantage of high thermo-optic coefficient of polydimethylsiloxane are combined, and the vernier interferometer has the advantages of low cost, high sensitivity, high stability and the like.

The application relates to a tunable laser, which comprises a channel selection component, a plurality of optical amplifiers, a micro-ring filter component and a reflection component, the micro-ring filter component is coupled with the reflection component, and the working wavelength range of each optical amplifier is different; wherein: the channel selection component is used for selecting any optical amplifier to input a gain optical signal into the micro-ring filter component; the micro-ring filter component is used for filtering the gain optical signal under a vernier effect to obtain a filtered optical signal and then inputting the filtered optical signal into the reflection component; and the reflection component is used for outputting part of the filtered optical signal to the outside and reflecting the other part of the filtered optical signal to the optical amplifier currently selected by the channel selection component after the other part of the filtered optical signal passes through the micro-ring filter component. The wavelength range of the laser tuning of the application is large.

The invention discloses a miniaturized adjustment-free ultra-narrow linewidth composite filtering external cavity semiconductor laser, which belongs to the field of semiconductor lasers and is sequentially provided with a gain chip, an aspherical lens, a first FP etalon, a second FP etalon, an interference filter, a partial reflector, an optical isolator and a polarization maintaining optical fiber collimator. Wherein the first FP etalon and the second FP etalon are superposed in a non-coaxial mode to form a free spectral range difference, a longitudinal mode interval difference is generated through a Vernier effect, and a longitudinal mode interval generated by the Vernier effect is controlled by adjusting a dip angle difference between the first FP etalon and the second FP etalon. Through machining precision, optical coupling optimization and an automatic assembly technology, the problems of wide tuning bandwidth, ultra-narrow linewidth, multi-dimensional performance collaboration and environmental adaptability are synchronously solved.

The application provides a two-parameter measurement optical fiber sensor based on harmonic vernier effect and a manufacturing method, and belongs to the field of optical communication.The sensor comprises, from the incident end to the emission end, an incident single-mode optical fiber, a first multi-mode optical fiber, a first ring-core optical fiber, a third multi-mode optical fiber, a second ring-core optical fiber, a second multi-mode optical fiber and an emission single-mode optical fiber arranged in sequence.The adjacent optical fibers are fused, the cross sections of the cores of the multi-mode optical fibers are all larger than those of the adjacent other optical fibers, and the cross section of the core of the ring-core optical fiber is larger than that of the core of the single-mode optical fiber.The length of the first ring-core optical fiber is such that the reflected light of the first end face and the reflected light of the second end face form a Fabry-Perot interference, and the proportion of the first ring-core optical fiber to the second ring-core optical fiber is such that a harmonic vernier or a basic vernier is generated.The two interferometers of the sensor share the same optical fiber structure, the cascaded double chambers generate the harmonic vernier effect, the sensitivity of the sensor is improved, and the different responses of the FPI and the MZI to the external temperature and strain are utilized, so that the dual-parameter sensing function is realized.

The invention discloses a method and device for amplifying the sensitivity of an interference type optical fiber sensor, and relates to the technical field of optical fiber sensing, and the method comprises the steps: collecting original broadband light source spectral data, constructing an artificial spectral data set based on the original broadband light source spectral data and a virtual spectral data set, the method comprises the following steps: acquiring measured spectral data of an interference type optical fiber sensor in a to-be-measured environment in real time, selecting reference spectral data according to a preset target magnification factor, subtracting through a spectrograph channel to obtain a vernier effect spectral data set, performing upper envelope fitting operation on each piece of vernier effect spectral data, recording a wavelength value corresponding to a feature tracking point, and calculating the spectral data of the interference type optical fiber sensor according to the wavelength value. And obtaining a predicted value of the physical quantity to be measured based on demodulation of the wavelength value-physical quantity parameter table. According to the virtual spectrum data set generating and processing method, the sensitivity of the interference type optical fiber sensor is remarkably improved, the system structure is simplified, the cost is reduced, and the stability and reliability of the system are improved.

The invention discloses an optical fiber double-parameter sensor based on a quadratic vernier effect, and belongs to the technical field of optical fiber sensors. Light splitting is carried out through an SLD wide-spectrum light source and a first 3dB coupler, a Solc-Sagnac interferometer (containing two sections of small-diameter polarization maintaining optical fibers welded by 90 degrees) and a Sagnac interferometer (containing a single section of small-diameter polarization maintaining optical fibers) are connected in parallel, two paths of optical signals are modulated and then synthesized through a fourth 3dB coupler, and a spectrometer displays a finally output spectrum. Wherein the Solc-Sagnac interferometer generates a first vernier effect, free spectral width matching of the Sagnac interferometer and the Solc-Sagnac interferometer is in a similar range, a second vernier effect is generated, the temperature and stress sensitivity is further amplified, and when temperature change / stress is applied, envelope trough displacement is doubly amplified, so that the temperature and stress sensitivity is improved. The optical fiber double-parameter sensor has the advantages of being small in size, simple in structure, capable of achieving double-parameter measurement, high in sensitivity and the like.

The invention discloses a microwave photon channelized receiving method based on a double-vernier effect. The method comprises the following steps: S1, generating two paths of coherent optical frequency comb signals of which the initial frequency and the free spectral range are slightly different; s2, performing single side band modulation on the two paths of optical frequency comb signals by using the original radio frequency signal; s3, respectively carrying out wavelength division multiplexing on the two paths of modulated optical signals, separating out each comb tooth and radio-over-fiber signal components at the same frequency with each comb tooth in the other path of modulated optical signals, and then forming a local oscillator / signal pair by the comb teeth at the same frequency and the radio-over-fiber signal components; and S4, performing dual-output image frequency suppression mixing on each group of local oscillator / signal pairs. The invention further discloses a microwave photon channelization receiving device based on the double-vernier effect. Compared with the prior art, the channelization efficiency and the image frequency suppression effect can be greatly improved.

The invention discloses a four-micro-ring band-pass filter which comprises a first linear waveguide, a second linear waveguide and a third linear waveguide which are parallel to one another and are sequentially arranged in a first direction, and the first linear waveguide, the second linear waveguide and the third linear waveguide extend in a second direction perpendicular to the first direction; the first micro-ring and the second micro-ring are arranged between the first linear waveguide and the second linear waveguide and are sequentially arranged along a first direction; and the third micro ring and the fourth micro ring are arranged between the second linear waveguide and the third linear waveguide and are sequentially arranged along the first direction. By cascading the two double-ring filters with different radiuses and utilizing the vernier effect, the ultra-large FSR of the C wave band is realized while the low loss is ensured, the structure is compact, the process is mature, and the thin-film lithium niobate optical chip is suitable for preparation and application of a large-scale thin-film lithium niobate optical chip.

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.

The present invention relates to the technical fields of external cavity lasers and lithium niobate photonic waveguides, specifically providing a hybrid integrated external cavity tunable laser based on a lithium niobate photonic waveguide. The laser comprises an end-coupled semiconductor optical amplifier and a photonic chip, wherein the waveguide layer of the photonic chip is made of lithium niobate. The photonic chip includes a phase modulator, a vernier microring filter, and an asymmetric MZI. The phase modulator adjusts the laser phase based on the electro-optic effect of the lithium niobate material; the vernier microring filter adjusts the laser wavelength based on the vernier effect of the vernier microring filter and the electro-optic effect of the lithium niobate material; and the asymmetric MZI suppresses side modes at different laser wavelengths based on the electro-optic effect of the lithium niobate material. A time-varying voltage signal is synchronously applied to the electrodes of the phase modulator, the vernier microring filter, and the asymmetric MZI to achieve wide-bandwidth linear frequency modulation of the laser. The present invention has a simple manufacturing process and a fast tuning response speed. Based on the electro-optic effect of the lithium niobate material, wide-bandwidth linear frequency modulation of the laser is achieved.