146 results about "Microwave photonic" patented technology

The invention discloses a DP-MZM-based reconfigurable mixer with phase shift and image rejection functions, and belongs to the field of microwave photon signal processing. By adjusting an input radio frequency signal and a direct current bias voltage of the DP-MZM1, four different LO frequency doubling and mixing functions can be realized. By controlling the angle alpha between the polarization direction of the polarization analyzer and one axis of the modulator, the phase of the generated signal can be flexibly tuned in the range of 0-360 degrees. When combined with the optical frequency comb, the multi-channel multi-band frequency conversion system can be expanded into a multi-channel multi-band frequency conversion system with independent phase tuning capability by utilizing the channel switching and frequency slot selection functions of the wavelength selection switch, and parallel output of various frequency mixing results can be realized. By adjusting the phase difference between the two-channel output signals, I / Q mixing, double-balanced mixing and image rejection mixing can be configured. The scheme is not influenced by direct current bias drift, the system complexity is reduced, and the frequency conversion efficiency is improved.

The invention relates to the technical field of microwave photonics, and discloses a full-band noise microwave source system and a microwave signal generation method. An optical reference unit is used for generating an optical reference signal; the photoelectric phase detection unit is connected with the optical reference unit and is used for receiving the optical reference signal and a feedback signal sent by the microwave oscillation unit and outputting a beat frequency electric signal for reflecting a phase error; the servo control unit is connected with the photoelectric phase detection unit and the microwave oscillation unit and is used for separating the beat frequency electric signal into a low-frequency control signal and a high-frequency control signal; the microwave oscillation unit is connected with the servo control unit and outputs a target microwave signal in response to the low-frequency control signal and the high-frequency control signal. A beat frequency electric signal is separated into a low-frequency path and a high-frequency path by using the servo control unit, so that targeted suppression of phase noise of different frequency bands in a single signal source is realized.

The invention provides a broadband linear frequency modulation microwave source based on ultra-short external cavity modulation light feedback, and relates to the field of microwave photonics. Continuous light generated by the main semiconductor laser is injected into the slave laser after being adjusted, so that the slave laser works in a periodic oscillation state; the slave laser, the electro-absorption modulator and the reflector are integrated to form an ultra-short outer cavity, and the intensity of feedback light is regulated and controlled by an external signal source so as to realize linear scanning of cavity mode frequency. After beam splitting of light output from the laser, one path forms a long external cavity feedback stable signal through the adjustable optical fiber delay line, and the other path outputs a target signal after beat frequency of the photoelectric detector and filtering of the band-pass filter. A high-speed modulator and a high-frequency microwave source are not needed, the broadband advantage of a photonics scheme is reserved, the frequency sweeping bandwidth is further improved to 60 GHz or above, the center frequency and the frequency sweeping range are independently adjustable, the structure is simple, cost is low, integration is easy, and the device is suitable for scenes such as photoelectric radars.

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 technology described herein is directed towards a cryogenic magnet-less circulator device, in which the circulator device is based on the spatiotemporal modulation of angular momentum for microwave photons, controlled using a modulated control signal. The circulator device is configured for integration with a quantum computer, e.g., to facilitate qubit measurements. The circulator topology and design are based on tank circuits, e.g., arranged in a star topology with different sets of radio frequency superconducting quantum interference devices (rf-SQUIDS) per tank circuit, that resonate out-of-phase based on the modulated control signal. A single control line can be used to operate the circulator. The circulator can be fabricated using standard semiconductor processes, allowing one or more circulators to be integrated on the same superconducting chip as the qubits. A classical computer can be used to output the modulated control signal, and adapt the modulated control signal as needed under varying conditions.

The application provides a photon-assisted ultra-wideband millimeter wave multi-channel receiver, and the ultra-wideband millimeter wave multi-channel signal is channelized and divided by adopting the radio frequency local oscillator microwave photon frequency conversion, high-frequency stable multi-channel channelization local oscillator generation and multi-channel parallel coherent detection technology; under the constraint of a low-cost analog-digital converter, the function of high-sensitivity parallel narrowband reception of the ultra-wideband millimeter wave signal is realized through parallel channel analog-digital conversion and reception processing, and large capacity and long-distance transmission of millimeter wave wireless communication are supported. The application solves the problems of ultra-wideband signal reception, analog-digital conversion and processing in millimeter wave wireless communication, supports large capacity and long-distance transmission of millimeter wave wireless communication, and can be applied to an ultra-wideband millimeter wave wireless communication system; the principle is simple, the scheme is simple and efficient, and the application value is high.

The invention discloses a distributed radar and laser radar system based on a chaotic optical comb, and belongs to the technical field of microwave photonics and laser. The distributed radar and laser radar system comprises a chaotic optical comb signal generation module, a wavelength division multiplexer, N optical fibers and N radar and laser radar modules. A chaotic optical comb signal generated by the chaotic optical comb signal generation module is divided into N single chaotic optical signals with different wavelengths in the wavelength division multiplexer; the N single chaotic optical signals with different wavelengths are respectively transmitted to the N radar and laser radar modules at different spatial positions through the N optical fibers, so that spatial distribution of the signals is realized. The single chaotic optical comb signal source is combined with the wavelength division multiplexer and the optical fiber, sensing signals are provided for a plurality of radar and laser radar modules which are arranged in a distributed mode, generation and distribution of multi-path distributed sensing signals are achieved, a traditional multi-source scheme is replaced, system cost, size and complexity are reduced, and compact 360-degree annular sensing array deployment is supported.

The invention discloses a multi-modal information network system based on microwave photon energizing enhancement and an operation method. The system comprises a high-precision time-frequency synchronization subsystem, a broadband parallel processing subsystem and a broadband high-speed frequency hopping subsystem which are connected in sequence. According to the invention, the advantages of broadband, low loss and high precision of the microwave photon technology are utilized to enable and enhance information network node equipment, so that the communication capabilities of high-precision time-frequency synchronization, broadband signal parallel processing and large-bandwidth anti-interference interception frequency hopping are realized; therefore, the problems that multi-frequency, multi-form and large-capacity signal receiving and processing are difficult to realize by the existing electronic technology, and high real-time, high-speed, high-precision, high anti-interference and anti-interception requirements of a communication network in a complex electromagnetic environment in the future cannot be met are solved.

The application discloses a microwave photon frequency hopping signal generation device and method based on an optical switch and belongs to the technical field of optical communication. The application is composed of a light source, a beam splitter, an optical frequency comb generator, an electro-optical frequency shifter, an acousto-optic modulator, a digital frequency synthesizer, a filter array, a signal control unit, an electrically controlled high-speed optical switch, a beam combiner and a photoelectric detector. The application separates optical frequency comb teeth by using an ultra-narrow bandwidth optical filter, selects and opens the frequency hopping signal generated by the local light beat frequency through the optical switch, and can generate a high-speed high-order high-stability frequency hopping signal compared with the prior art.

This invention proposes a random microwave pulse generation system and method based on an optoelectronic oscillator, belonging to the field of microwave photonic signal generation and processing technology. The system includes a laser, a polarization controller, a closed-loop optoelectronic oscillator (OEO) loop, a random fiber grating string, and a function generator; wherein the closed-loop optoelectronic oscillator (OEO) loop mainly consists of a Mach-Zehnder modulator, a circulator, an erbium-doped fiber amplifier, a photodetector, an electrical amplifier, and a directional coupler.

This invention discloses a method and system for determining the type and parameters of interference signals based on microwave photonics technology. The method utilizes microwave photonics technology to modulate broadband interference signals into the optical domain. By dynamically matching the LCT transform kernel function with the reference signal parameters, the LCT operation is directly performed in the analog domain, focusing the interference signal in the optimal LCT domain. Based on the time-frequency characteristics after focusing, real-time type judgment and parameter estimation of the interference signal are achieved, completely avoiding the digital domain iterative operations of existing electronic methods. The computational complexity is reduced to microseconds, and the parameter estimation delay reaches the microsecond level, without any broadband throughput bottleneck. The parameter tuning delay depends only on the control rate of the reference signal, adapting to the type identification and parameter estimation requirements of various types of broadband interference signals, such as linear frequency modulation, frequency hopping, slice combination, and intermittent sampling and forwarding. The resistance to environmental interference and stability are significantly enhanced.

A scattering parameter measurement device based on microwave photonic mixing includes a microwave generation module 1, a signal loading module 2, a local oscillator frequency generation module 3, a multi-channel microwave photonic mixing module 4, an analog-to-digital converter (ADC) module 5, and a signal processing module 6. Along the signal output direction of the multi-channel microwave photonic mixing module 4, the ADC module 5 and the signal processing module 6 are sequentially arranged. This invention utilizes microwave photonic mixing technology and a local oscillator source with relatively small bandwidth to down-convert a high-frequency microwave signal to a fixed-frequency intermediate frequency (IF) signal. This reduces the bandwidth requirements of the receiver's electronic components and the sampling rate requirements of the ADC. It abandons the traditional superheterodyne structure and / or direct conversion structure, using a miniaturized continuous optical module as the light source for microwave photonic mixing, simplifying the system structure and reducing cost and power consumption.

Disclosed is a method for characterising a sample (E), said method comprising magnetically coupling the sample to a microwave resonator (RHS) such that the coupling dominates the relaxation dynamics of an electron spin (SEL) of a paramagnetic centre of the sample, and determining, by nuclear-magnetic-resonance spectroscopy, coefficients Cij of coupling between a nuclear spin of the sample, called the probe nuclear spin (SNi), and other nuclear spins (SNj, SNk) of the sample, said method employing indirect detection of a state of said probe nuclear spin (SNi), through counting of microwave photons, of respective noise signals (SBS) produced by the return to equilibrium of said electron spin (SEL). An apparatus for implementing such a method is also disclosed.

This invention relates to the fields of optical fiber communication and microwave photonics. Existing tunable dual-passband microwave photonic filters suffer from poor passband stability and cannot meet practical application requirements. This invention provides a narrow-band tunable dual-passband microwave photonic filter using a Brillouin fiber laser. It generates dual-tone pump light to excite the Brillouin using a tunable laser source and an intensity modulator. Combined with a Brillouin fiber oscillator and a cascaded Fabry-Perot cavity, the Brillouin gain spectrum is narrowed to the kHz level. Simultaneously, the different periodic resonant frequencies of the two ring cavities effectively suppress side modes, filtering out the desired frequency band signal. Furthermore, by synchronously tuning the center frequencies of the two passbands of the filter by changing the pump light wavelength, and simultaneously controlling the output frequency of the signal generator, the frequency interval between the two passbands is changed, ultimately realizing a narrow-linewidth tunable dual-passband microwave photonic filter.

The invention discloses a delay measurement system and method for a microwave over fiber transmission link, and belongs to the technical field of microwave photonics. The modulator is used for modulating the radio-frequency signal generated by the radio-frequency signal generator to an optical carrier and generating modulated light containing + / -1-order sidebands; the radio frequency signal is a dual-tone signal with the frequency range of 30 GHz to 70 GHz; the frequency shift unit is used for performing frequency shift on the modulated optical signal; and the dual-optical mixing unit is used for mixing the return signal and the reference signal and converting the phase shift direct detection of the high-frequency signal into the relative phase shift detection of the intermediate-frequency signal. A dual-tone signal is modulated into a 1550nm optical carrier, + / -1-order sidebands are separated through a dual-optical mixing structure, intermediate frequency signals of the + / -1-order sidebands are detected through a balanced photoelectric detector, and phases are detected, so that link transmission delay is calculated. The problem of phase ambiguity of high-frequency signals during large-range measurement is solved, and large-range absolute delay measurement is realized.

Aspects of the present disclosure describe integrated optics-based phase controllers that include a waveguide having a core with one or more cavities whereby it can exhibit enhanced photoelastic effects and / or increased stress-induced deformation in at least one zone. The waveguides according to the present disclosure are particularly useful in stress optical phase controllers that are suitable for systems such as microwave photonics, LiDAR, and the like.

The invention discloses an ultra-wideband microwave photonic link with in-band spurious suppression capability, which comprises a laser, an electro-optical modulator, a sideband phase shifter and a photoelectric detector, and is characterized in that the laser is used for outputting an optical carrier signal; the electro-optical modulator is used for modulating a radio frequency input signal to an optical carrier signal to form a modulated optical signal; the sideband phase shifter is used for performing phase shifting processing on the stray sideband to obtain a phase-shifted optical signal; and the photoelectric detector is used for carrying out photoelectric conversion on the phase shift optical signal and restoring a radio frequency signal as a radio frequency output signal. In the invention, coherent cancellation is carried out by adopting an optical domain spurious signal modulation sideband phase shift mode to realize directional suppression of spurious signals, so that spurious signal suppression in an ultra-wide transmission frequency band can be realized, the inherent broadband transmission capability of a microwave photon link is not damaged, and the method can be applied to the fields of radar, electronic warfare, communication, navigation, monitoring and the like.

The invention belongs to the technical field of microwave photons, and provides a double-ring photoelectric oscillator and a stabilizing method thereof. The oscillator is provided with a long ring and a short ring and comprises a stabilizing device; the stabilizing device comprises a first piezoelectric ceramic optical fiber stretcher, a motor space light delay line and a second piezoelectric ceramic optical fiber stretcher; generating two optical probe signals; the first optical probe signal is converted into a first electric probe signal through the long ring; a second optical probe signal is converted into a second electric probe signal through the short ring; an electric probe signal is output after being subjected to detection, coupling and power division; the two frequency mixers respectively carry out homodyne frequency mixing on the electric probe signal and the phase-shifted and non-phase-shifted radio frequency signals to generate a zero-frequency error signal; the two phase-locked loops generate compensation control signals according to the error signals; the control signal adjusts an optical fiber delay line; the stability of the two loops is ensured, the problem of combined signal frequency drift caused by neglecting short-loop delay change is solved, the coherence requirement on optical signals is avoided by electric domain combination, and smooth tuning of the output radio frequency signal frequency is realized.

The application provides a high-precision direction finding method and device combining time difference and phase difference of microwave and photon, and the method comprises the following steps: obtaining a target broadband microwave signal; performing smoothing filtering on each microwave signal respectively to obtain time difference estimation values corresponding to two microwave signals; obtaining phase difference estimation values corresponding to the two microwave signals according to the relationship between the time difference and the phase difference; performing consistency correction on each microwave signal respectively to obtain time-phase calibration coefficients; obtaining time difference measurement values and phase difference measurement values through the time-phase calibration coefficients respectively; performing combined direction finding processing operation according to the time difference measurement values and the phase difference measurement values to obtain a direction finding angle; the improved time difference and phase difference combined direction finding method is innovatively provided by using the advantages of time difference direction finding and phase difference direction finding, the phase difference ambiguity is solved through time difference surface fitting interpolation, high-precision direction finding of distributed single baseline two antennas can be realized, the requirements of equipment volume, power consumption and cost are reduced, and the method has good application value.

The invention provides a dual-multistatic radar system based on an all-optical architecture, which comprises a transmitting station and a receiving station, adopts the all-optical architecture, fully adopts microwave photon technical achievements, and comprises an optical frequency source, optical up / down conversion filtering, an optical phase shift network, optical beam forming, optical channelization and an optical ADC (Analog to Digital Converter). The characteristics of wide working band, low phase noise dispersion, low delay loss and the like of microwave photons are fully utilized; the system adopts a dual multi-base mechanism, supports receiving and transmitting separation and multi-view target observation, and has the system advantages of extremely strong anti-stealth, low interception, anti-interference and the like; the system adopts a wireless synchronization technology based on 1PPS signals to solve the problems of synchronization and signal coherence of the double-base radar and the multi-base radar, the practical scene of the system is effectively widened, and the layout difficulty of the system is reduced.

The application discloses a high-polarization-extinction-ratio integrated Y waveguide structure based on a thin film lithium niobate, relates to the fields of microwave photonics, integrated optoelectronics and high-precision inertial sensing technology, and comprises a substrate, a lower cladding layer, a thin film lithium niobate layer and an upper cladding layer from bottom to top; and the polarization extinction ratio of the device is significantly improved according to the application; in view of the problem of poor polarization extinction ratio performance of the current monolithic integrated thin film lithium niobate Y waveguide due to the lack of an on-chip efficient polarization structure, the application creatively utilizes mode parity symmetry for filtering; the energy zero point position of the TE1 mode is determined by the waveguide electromagnetic field eigen equation and does not drift with the external environment temperature or stress; unlike the directional coupler relying on nanoscale gaps or the subwavelength grating with a minimum line width; the end-to-end transmission loss of the polarization and filtering of the application can be controlled at a very low level, so that the optical power margin and the overall signal-to-noise ratio of the fiber-optic gyroscope system detection end are significantly improved.

The invention provides a moving and standing wave electrode composite loading microwave photon receiving antenna and a signal receiving method thereof.The antenna comprises a dual-band combined plane patch antenna and a lithium niobate film moving and standing wave electro-optical modulation chip, a high-frequency antenna and a moving wave electrode are mutually connected through gold wire bonding, and a low-frequency antenna and a standing wave electrode are mutually connected through gold wire bonding; and a single beam of light wave is modulated by the two electrodes in sequence by using a cascade light path. The signal receiving method comprises the steps of light wave injection, dual-band signal induction and loading, sequential modulation based on the lithium niobate electro-optical effect, photoelectric conversion and signal extraction. Through the traveling wave and standing wave electrode composite loading and optical domain modulation mechanism, the bottleneck that the bandwidth of a traditional antenna is limited by impedance matching is broken through, high-sensitivity receiving is achieved within the ultra-wide band of 10 MHz to 20 GHz, and meanwhile the ultra-wide-band antenna has the advantages of being compact in structure and high in electromagnetic interference resistance and is suitable for ultra-wide-band weak field detection and high-precision electromagnetic signal receiving.

This invention discloses a steady-state tunable dual-wavelength generation method based on laser phase-locked loop (PLL), belonging to the field of microwave photonics technology. It includes carrier-suppressed optical double-sideband modulation, a laser PLL, and optical wavelength control. Carrier-suppressed optical double-sideband modulation: the reference signal generated by the reference laser directly drives the modulator, which operates at the carrier suppression point, modulating the RF source onto the two sidebands of the reference signal, providing two reference wavelengths for dual-wavelength generation. Costa laser PLL: based on Costa PLL technology, frequency capture and phase locking of the signal light to the reference light are achieved. Optical wavelength control: digital frequency discrimination is used to track the frequency and phase difference between the signal light and the reference light, controlling the signal light wavelength to remain consistent with the reference light wavelength. This invention solves the frequency drift problem caused by using two independent light sources, and by combining optical frequency doubling, achieves steady-state tunable dual-wavelength generation, thereby supporting the generation of high-quality millimeter-wave signals.

The invention discloses a photonic system and method for simultaneously measuring a microwave angle of arrival and Doppler frequency shift, and belongs to the technical field of microwave photon-assisted radars, the photonic system drives one sub-MZM through an echo signal, and simultaneously drives the other sub-MZM through a combination of a phase delay echo signal and a transmission signal. Two on-chip optical band-pass filters are adopted to select an upper sideband and a lower sideband of an output signal of the high-speed silicon-based dual-parallel Mach-Zehnder modulator, and then two intermediate-frequency signals are generated after detection by an on-chip photoelectric detector and amplified by a trans-impedance amplifier. By comparing the power, phase and frequency of the intermediate frequency signals, the microwave arrival angle and Doppler frequency shift (including direction information) can be obtained at the same time. The device is small in measurement error, is highly integrated, has the advantages of compact size and high system stability, and has a good application prospect in a radar system.

The invention relates to a transmission channel compensation system and method based on a microwave photon multicarrier technology, and the system comprises a homologous laser output module which is used for outputting a homologous optical carrier seed and an optical local oscillator seed; the optical carrier generation module is used for generating optical carriers; the photon spread spectrum signal generation module is used for generating an optical carrier spread spectrum signal according to the received spread spectrum signal; the optical coding local oscillator generation module is used for generating optical domain coding multiple local oscillators required by spread spectrum; the optical domain channel compensation module is used for performing optical domain amplitude phase regulation and control on the optical domain coding multiple local oscillators based on channel attenuation and dispersion to generate compensation optical local oscillators; the optical domain despreading module is used for performing convolution processing on the optical carrier spread spectrum signal and the compensation optical local oscillator to obtain a despread radio frequency signal; and the digital signal processing module is used for carrying out analog-to-digital conversion and digital processing on the despread radio frequency signal to realize signal demodulation. According to the invention, high-performance de-spreading and extraction are carried out on the signal influenced by the amplitude phase in the channel.

The present disclosure provides a laser measurement system and method, which is applied to the field of microwave photon technology. The system comprises an antenna, a microwave source, a laser, a polarization controller, a double parallel Mach-Zehnder modulator, an electrical coupler, a photoelectric detector and a signal processing module. The antenna is used to receive a return signal, the microwave source is used to emit a reference signal, the polarization controller controls the polarization direction of the optical carrier emitted by the laser, the return signal and the reference signal are modulated onto the optical carrier with the controlled polarization direction through the double parallel Mach-Zehnder modulator, and a modulated optical signal is output, the modulated optical signal enters the signal processing module after frequency mixing processing by the photoelectric detector, and the signal processing module outputs a final result to obtain the measurement results of Doppler shift and angle of arrival at the same time. The present disclosure can realize the simultaneous measurement of Doppler shift and angle of arrival, determine the direction of Doppler shift, and is not limited by electromagnetic interference and working bandwidth, and has a very large working bandwidth.

The utility model provides a kind of wideband tunable microwave photon frequency hopping communication system, including data transmitting device, data transmitting device includes four Mach-Zehnder modulators, and each Mach-Zehnder modulator receives the signal output by quadrature amplitude modulator;Carrier signal source outputs the carrier signal containing four different wavelengths to first wave division multiplexer, and first wave division multiplexer outputs four carrier signals to first optical switch, and first optical switch outputs four carrier signals to four Mach-Zehnder modulators, and first optical switch also receives the first control signal output by first frequency hopping sequence controller, and Mach-Zehnder modulator uses respective carrier signal to modulate received digital signal and then output;First micro electromechanical device is provided in first optical switch, and first micro electromechanical device has first mirror and can change the rotation angle of first mirror.The utility model can improve the security of data transmission, and production cost is low.

The invention belongs to the technical field of microwave photons, and provides a double-ring photoelectric oscillator with a stabilizing device and a stabilizing method thereof, the double-ring photoelectric oscillator is provided with a long ring, a short ring and a stabilizing device; the stabilizing device comprises a first piezoelectric ceramic optical fiber stretcher and a motor space light delay line; the radio frequency signal source generates a first optical probe signal and a second optical probe signal through modulation; the first optical probe signal is converted into a first electric probe signal after passing through the long ring; a second optical probe signal is converted into a second electric probe signal after passing through the short ring; the first frequency mixer and the second frequency mixer are used for performing homodyne frequency mixing on the electric probe signal and the radio frequency signal to generate a zero frequency error signal; and the two phase-locked loops generate compensation control signals according to the zero-frequency error signals. According to the invention, by outputting the control signal and adjusting the optical fiber delay line, the stability of two loops is ensured, the problem of combined signal frequency drift caused by neglecting short-loop delay change is solved, and the coherence requirement on two paths of optical signals is avoided by electric field combination.

This invention relates to the field of microwave photonics, and provides a broadband radio frequency signal replication device based on microwave photonics. The device includes an electro-optical conversion module, a signal replication module, and an optical-electrical conversion module connected sequentially via optical fibers. The electro-optical conversion module converts the input radio frequency signal into an optical radio frequency signal. The signal replication module performs adjustable delay and feedback adjustable amplification on the optical radio frequency signal to form a series of replicated optical carrier signals with adjustable amplitude and time. The optical-electrical conversion module converts the replicated optical carrier signal back into a replicated radio frequency signal and outputs it. This invention features low latency, high fidelity, and large radio frequency bandwidth, while also allowing for adjustment of the replicated signal's delay time and amplitude.

According to the acousto-optic modulator for realizing microwave photon conversion and the preparation method thereof provided by the invention, the runway type micro-ring is constructed on the piezoelectric film layer, the acoustic resonance frequency is accurately matched with the free spectral range of the runway type micro-ring structure, the cyclic generation of an optical modulation sideband is realized, the interaction between light waves and sound waves is greatly enhanced, and the optical modulation efficiency is improved. The acousto-optic coupling efficiency is remarkably improved, the power consumption of the device is greatly reduced, microwave photon conversion is achieved, the device is compact in overall structure and small in size, high-density on-chip integration is easy to achieve, further, periodic polarization is carried out on the interdigital electrodes, a cavity is formed under the piezoelectric film layer, and the photoelectric conversion efficiency of the device is improved. And the piezoelectric film layer is suspended, so that the working bandwidth of the device is further improved, and the requirement of high-speed information processing is met.