448 results about "Microwave photonic" patented technology

The invention discloses a photon-assisted radar frequency shift interference and intermittent sampling forwarding interference integrated signal generation method, and relates to the technical field of microwave photon and radar countermeasure. The method is shown in a figure 1 in the specification and is realized based on a laser device (LD), an arbitrary waveform generator (AWG), a dual-drive Mach-Zehnder modulator (DDMZM), an intensity modulator (IM) and a photoelectric detector (PD). According to the method, by adjusting the period of sawtooth waves, the duty ratio of rectangular pulse signals and the sampling period, generation of interference signals integrating various frequency shift interferences and intermittent sampling and forwarding interferences can be achieved. According to the invention, two simple modulators are adopted, and complex bias voltage and polarization state control is not needed; a digital radio frequency memory is not adopted, analog-to-digital and digital-to-analog conversion is not needed, the real-time performance is good, and parameter tuning is flexible; an electric domain frequency dependent device is not adopted, interference signals with the broadband of more than 1 GHz and the wave band of more than Ku can be generated, and the device is suitable for an electronic countermeasure system with the broadband of more than 1 GHz and the wave band of more than Ku in the future.

The invention discloses a multi-modulation-format vector signal modulator based on microwave photonics, and relates to the field of microwave photonics. Comprising an IQ quadrature modulation module, a continuous wave laser, a first power optical splitter, an optical carrier frequency generation module, a polarization beam combiner, an optical amplifier, a polarization beam splitter and a photoelectric balance detector module, the IQ quadrature modulation module comprises a double-parallel Mach-Zehnder modulator, a first forming filter, a second forming filter, a first attenuator, a second attenuator, a first direct current voltage stabilization source and a second direct current voltage stabilization source. According to the invention, the formed and filtered IQ baseband signal is input into the double-parallel Mach-Zehnder modulator for quadrature modulation, the IQ baseband signal and the other path of optical carrier signal subjected to differential MZM frequency multiplication are subjected to polarization beam combination, and then the signal is converted into a radio frequency signal through PD, so that the generation of a high-frequency-band and multi-modulation-format vector signal is realized, and the high-frequency-band multi-modulation-format vector signal is suitable for the fields of high-speed communication, photon radar and the like.

The invention provides a diaphragm type optical fiber liquid level sensing demodulation device and method based on a microwave photon technology, and the device comprises a broadband light source, a circulator, a diaphragm type optical fiber liquid level sensor, an erbium-doped optical fiber amplifier, a polarization controller, a DC power supply, a radio frequency source, an electro-optical modulator, a dispersion compensation optical fiber, a photoelectric detector and a power meter. The broadband light source is connected with a first port of the circulator, a second port of the circulator is connected with the diaphragm type optical fiber liquid level sensor, a third port of the circulator is connected with the erbium-doped optical fiber amplifier, the erbium-doped optical fiber amplifier is connected with the polarization controller, and the polarization controller is connected with the input end of the electrooptical modulator. The radio frequency source is connected with the modulation input of the electro-optical modulator, the direct current power supply is connected with the bias voltage input of the electro-optical modulator, the output of the electro-optical modulator is connected with the photoelectric detector through the dispersion compensation optical fiber, and the photoelectric detector is connected with the power meter, so that the measurement range is expanded while the sensing sensitivity and the resolution ratio are improved.

The invention discloses a photon device and method for simultaneously measuring Doppler frequency shift and an angle of arrival, and belongs to the technical field of microwave photon-assisted radars. The device is configured to enable a transmitting signal and a reference signal to enter a first dual-parallel Mach-Zehnder modulator working in a carrier suppression single sideband modulation mode after being combined so as to generate two positive first-order sideband signals, and then the two positive first-order sideband signals enter a second dual-parallel Mach-Zehnder modulator and are modulated by an echo signal; and a modulation signal output from the second dual-parallel Mach-Zehnder modulator enters a photoelectric detector for photoelectric conversion to generate a down-conversion signal. Comparing the frequency of the down-conversion signal with the frequency of the reference signal by using an electric spectrum analyzer to obtain the magnitude and direction of Doppler frequency shift; the arrival angle of the target can be obtained by monitoring the power of the frequency conversion signal. Measurement of Doppler frequency shift and the angle of arrival can be completed only by using the photoelectric detector with the bandwidth lower than the frequency of the transmitted signal, and the requirement for the bandwidth of the photoelectric detector is lowered.

The invention relates to the field of radar detection methods, and discloses a microwave photon multiband radar detection method, which comprises the following steps: generating detection signals of multiple bands based on a microwave photon method, transmitting the detection signals to a target, and then carrying out dechirp processing and digital signal processing on target reflection signals to obtain a target detection result. The method specifically comprises the following steps: generating a fundamental frequency signal through a user-defined bit sequence generator, a pulse generator and an electric frequency modulator, adjusting the central wavelength and bandwidth of a signal waveform by the electric frequency modulator, amplifying the power of the fundamental frequency signal by a certain multiple through an electric power amplifier, and modulating by a distributed feedback semiconductor laser, a plurality of sidebands with equivalent power are generated by the spectrum of the optical fiber, a modulated fundamental frequency signal is input into the photoelectric detector through the optical fiber, and then the modulated fundamental frequency signal is amplified by the electric low noise amplifier to generate a multi-band frequency modulation signal. And the multifunctional detection capability of the radar system can be realized.

The invention discloses a multi-vital-sign non-contact perception radar system based on a microwave photon technology. The optical domain control module generates broadband optical signals and sends the broadband optical signals to the laser signal transmitting and receiving module and the microwave signal transmitting and receiving module respectively. One path serves as an optical radio frequency signal to detect a vital sign, and receives echoes sent by the front end of the optical antenna to obtain an intermediate frequency signal containing vital sign information; the other path of beat frequency generates a microwave ultra-wideband radio frequency signal to detect another vital sign, and receives an echo sent by the front end of the antenna to obtain an intermediate frequency signal containing vital sign information, and the two intermediate frequency signals are subjected to analog-to-digital conversion and then are subjected to digital filtering, time-frequency analysis, signal smoothing and coordinate transformation processing by the data processing module; and finally extracting vital sign information. According to the system, the ultra-wideband capability of the microwave photon radar is utilized, a wideband optical signal and an ultra-wideband radio-frequency signal are generated at the same time, and simultaneous non-contact measurement of respiration and pulse of a life body is achieved.

The invention discloses an electromagnetic signal processing-oriented microwave photon neuron convolution acceleration device, which relates to the technical field of signal processing, and comprises a microwave photon neuron convolution accelerator, an electromagnetic signal processing main control unit, a signal processing main control unit and a signal processing main control unit, the matrix multiplication and addition linear operation unit is used for completing matrix multiplication and addition linear operation of a received electromagnetic signal or processing data and a preset weight vector on an optical simulation domain, and outputting a matrix multiplication and addition linear operation result to the electromagnetic signal processing main control unit; the electromagnetic signal processing main control unit is used for inputting a pre-obtained electromagnetic signal in a vector format to the microwave photon neuron convolution accelerator, processing the received matrix multiplication and addition linear operation result to obtain processed data in the vector format, and outputting the processed data in the vector format to the microwave photon neuron convolution accelerator; and outputting the processed data to the microwave photon neuron convolution accelerator when the preset condition is not met. According to the invention, rapid processing and identification of the broadband electromagnetic signal can be realized, the calculation energy consumption demand is reduced, and the calculation power demand and the energy efficiency ratio demand of an electronic device are reduced.

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 discloses a narrow-linewidth double-frequency laser generation method, and belongs to the technical field of microwave photons. Two paths of optical signals generated by two semiconductor lasers with different wavelengths are injected into the same optical microcavity, the two paths of optical signals enter a self-injection locking state in different modes of the optical microcavity, and the optical microcavity can output narrow-linewidth double-frequency laser. The invention further discloses a narrow-linewidth double-frequency laser generating device and a photo-production microwave method and device. Two double-frequency lasers with different frequencies are locked on one optical microcavity through an original double-self-injection locking technology, the problem of phase noise of a double-frequency light source is effectively solved while the linewidth of the input laser is narrowed, common-mode noise caused by mode difference of the two lasers in a locking state is eliminated, and the dual-frequency light source has the advantages of being simple in structure and convenient to operate. And the traditional servo locking technology is not needed, so that the complexity of the system is simplified.

The invention discloses a software-defined multi-system satellite communication load system which comprises a satellite-borne routing unit, a microwave photon frequency conversion switching unit, a comprehensive antenna microwave antenna, a comprehensive ground microwave antenna, a high-performance computing power unit, a low-speed AD / DA conversion unit, a high-speed waveform processing unit and a laser / W-frequency-band microwave common-aperture inter-satellite satellite-ground terminal. According to the invention, on-demand expansion of load capacity and miniaturization of a load system are realized, and the system integration degree is improved.

The invention belongs to the technical field of microwave photon links, and particularly relates to a high-resolution microwave photon frequency measurement system based on real-time Fourier transform. The link comprises a mode-locked laser, a first dispersion compensation module, a second dispersion compensation module, a dual-drive Mach-Zehnder modulator, a Mach-Zehnder modulator, a dispersion optical fiber, a time lens, an erbium-doped optical fiber amplifier, a photoelectric detector and an oscilloscope; the mode-locked laser outputs femtosecond Gaussian light pulses, and the femtosecond Gaussian light pulses are injected into the first dispersion compensation module and then stretched into chirp light pulses; modulating the chirp light pulse through electro-optical modulators which are connected in parallel; the modulated optical signal is subjected to time amplification processing through a dispersion optical fiber, a time lens, a second dispersion compensation module and an erbium-doped optical fiber amplifier in sequence; and the optical signal after time amplification processing is converted into a microwave pulse carrying frequency information of the signal to be detected by a photoelectric detector, and the microwave pulse is observed by an oscilloscope.

The invention relates to a tunable microwave pulse generation system and method based on injection locking, and belongs to the technical field of microwave photon signal generation and processing. The system comprises a laser, a polarization controller, a closed-loop optoelectronic oscillator (OEO) loop and two microwave sources, wherein the closed-loop optoelectronic oscillator (OEO) loop is composed of a double-parallel Mach-Zehnder modulator, a single-mode optical fiber, an optical tunable delay line (OTDL), a photoelectric detector, a broadband band-pass filter, an electric amplifier, a power divider and a coupler which are connected in sequence.

The invention discloses a distributed MIMO (Multiple Input Multiple Output) integrated system and method based on a reconfigurable notch chaotic optoelectronic oscillator, belongs to the field of microwave photons, and solves the problems of spectrum resource conflict, difficulty in multi-node synchronization, discrete inductance functions and the like. According to the system, a plurality of independent chaotic OEOs are combined with an optical frequency comb to drive an FIR filtering effect, MIMO chaotic signals with reconfigurable notch frequency points and quantity are generated, and dynamic allocation of spectrum resources is realized. The notch frequency band is used as a communication channel embedded modulation signal, and supports multi-spectrum sharing with 2.4 G, 5G, Wi-Fi and the like; a non-notch frequency band is reserved as a radar signal, and the range resolution is improved by using the broadband characteristic of the chaotic waveform. The star topology optical network expands the coverage area of a distributed system, and a centralized processing architecture reduces the complexity of multi-node collaboration. The invention provides an integrated solution of high-precision environment perception and high-reliability communication for smart cities, Internet of Vehicles and the like, and is suitable for dense urban areas with resource shortage and dynamic multi-service environments.

The invention discloses a microwave photon radar strong maneuvering target identification method based on small sample incremental learning, and belongs to the field of microwave photon radar maneuvering target identification. Time-frequency dynamic, polarization space and geometric topological features are extracted through a deep learning model, and multi-dimensional joint characterization is realized in combination with a cross-domain attention mechanism; designing a polarization-time frequency adversarial generative network, generating synthetic data conforming to an electromagnetic scattering rule under the physical constraint of a Maxwell equation, and constructing a prototype feature support set through meta learning; a dynamic knowledge distillation framework is introduced, physical consistency loss is utilized to align motion parameters and classification probability distribution of the teacher model and the student model, and lightweight increment updating is realized in combination with gradient importance masks. According to the method, the recognition precision and real-time performance of the strong maneuvering target in a complex electromagnetic environment are remarkably improved, and the method is suitable for high and overspeed maneuvering target recognition.

The invention discloses an all-fiber cantilever beam type photoacoustic spectrometry gas detection system based on a microwave photon technology, which belongs to the field of photoacoustic spectrometry gas detection and comprises an F-P (Fabry-Perot) fiber sensor, a pump laser, an MZM (Mach Zehnder Modulator) modulator, a vector network analyzer, a coupler, a variable optical attenuator, a photoelectric detector and a reflector, the pump laser is connected with the input end of the MZM modulator, the output end of the MZM modulator is connected with the coupling input end of the coupler, the first output end of the coupler is connected with the reflector through the variable optical attenuator, and the coupling output end of the coupler is connected with the vector network analyzer through the photoelectric detector. According to the all-fiber cantilever beam type photoacoustic spectrometry gas detection system based on the microwave photon technology, the problems that a traditional diaphragm type F-P interference cantilever beam is large in size, low in sensitivity and greatly affected by temperature are solved, and the signal-to-noise ratio of a detection signal is increased; in addition, the establishment of the microwave photonic link enhances the resolution and speed of signal detection.

The invention discloses a modulation identification method based on microwave photon frequency-time mapping. The method comprises the following steps: firstly, performing microwave photon frequency-time mapping on a to-be-measured microwave signal, and mapping frequency information of the to-be-measured microwave signal to a time domain to obtain a time-frequency characteristic of the to-be-measured microwave signal; and inputting the time-frequency characteristics of the to-be-detected microwave signal into a pre-trained neural network model so as to identify the modulation form of the to-be-detected microwave signal. The invention also discloses a modulation identification device based on microwave photon frequency-time mapping. Compared with the prior art, on the basis of a microwave photon frequency-time mapping model, Fourier transform is directly completed through an optical device, a radio frequency signal is modulated to be processed in an optical domain, time delay characteristics of dispersion broadening and compression are combined, the picosecond-level time stretching precision is achieved, the instantaneous bandwidth limitation of a traditional spectrum analyzer is broken through, and the spectrum analysis precision is improved. Frequency spectrum processing of large-bandwidth signals can be completed in real time, computing resources are saved, and the real-time performance of modulation identification is improved.

The invention discloses a high-speed reliable communication device and method based on a microwave photon technology, and belongs to the technical field of microwave photons and optical communication, and the high-speed reliable communication device comprises a microwave photon signal transmitter and a microwave photon signal receiver, the microwave photon signal transmitter comprises an analog-to-digital conversion module, a data compiler and a transmitting antenna; the microwave photon signal receiver comprises a receiving antenna, an electro-optical modulator, an optical amplifier, a microwave photon chip module, an optical detector and a data demodulation module. The device can meet the requirement of high-speed communication, the coded signal has the characteristic of interception resistance, and the device has the characteristics of simple structure, convenience in design and easiness in integration.

The invention discloses a device and method for simultaneously measuring the two-dimensional angle of arrival and Doppler frequency shift of microwave photons, and belongs to the technical field of optical communication and microwaves, and the device is characterized in that an output port of a laser is connected with an optical input port of a PDM-DPMZM, and an optical output port of the PDM-DPMZM is connected with a common input end of an optical beam splitter; a first output port of the optical beam splitter is connected with a common input port of a first polarization beam splitter PBS1, and two output ports of the PBS1 are respectively connected with two optical input ports of a first balance photoelectric detector BPD1; an output port II of the light beam splitter is connected with a common input port of a polarization beam splitter II PBS2; and two output ports of the PBS2 are respectively connected with two light input ports of a balance photoelectric detector I BPD2. The device is simple in structure, and can solve the problem of low positioning precision in an existing simultaneous arrival angle and DFS measurement scheme.

The invention discloses a dual-wavelength mode-locked laser generating device and a dual-wavelength mode-locked laser generating method, and belongs to the technical field of optical communication, and the dual-wavelength mode-locked laser generating device comprises a pumping source, an optical integration module, a gain optical fiber, a saturable absorber and a dual-wavelength pulse independent polarization mode linear coupling regulation and control structure, linear coupling strength of cross-polarization components in two wavelength pulses is independently regulated and controlled by using a structure of a polarization controller and a polarization maintaining optical fiber, and dual-wavelength mode-locked pulse laser of different types of pulse combinations can be obtained. The coherent pulse light source with unique spectral characteristics can provide a low-cost light source for the fields of high repetition frequency optical combs, all-fiber architecture high repetition frequency soliton sequences and microwave photonics.

The invention provides a multichannel wavelength division multiplexing transmitting chip which can be applied to the technical field of microwave photonic integrated chips. The chip comprises a substrate, an array laser chip, an array modulator chip, a wavelength division multiplexing chip and a photon lead bonding structure, and the array laser chip, the array modulator chip and the wavelength division multiplexing chip are located on the substrate and located on the same side of the substrate; and the array laser chip, the array modulator chip and the wavelength division multiplexing chip are connected through photon lead bonding structures. Main devices in the microwave photonic system are integrated into a whole through the substrate and the photonic lead bonding structure, the monolithic integrated microwave photonic system is achieved, and the microwave photonic system has the advantages of being small in size, high in integration degree and high in reliability. The invention further provides a preparation method of the multi-channel wavelength division multiplexing transmitting chip.

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 discloses a microwave photon channelization receiving device and method based on a photoelectric oscillation loop structure. The device comprises an optical signal generation unit, a photoelectric modulation unit, an optical filtering unit, a photoelectric branching unit and a signal receiving unit. The optical signal generation unit is connected with the photoelectric unit; the photoelectric unit is connected with the optical filtering unit; the output end of the optical filtering unit is connected with the input end of the photoelectric branching unit, and the signal receiving unit is connected with the output end of the photoelectric branching unit. According to the invention, the sensitivity of the microwave photon channelized receiver can be effectively improved.

An on-chip integrated microwave photonic phase-coded signal generation system relates to the field of microwave photonic technology. The system includes a laser, a power splitter, a radio frequency (RF) switch, a 90° hybrid coupler (HC), a dual-parallel dual-polarization Mach-Zehnder modulator (DP-DPMZM), a polarization-dependent cascaded phase modulator (PDC-PM), a polarization beam splitter, an erbium-doped fiber amplifier, and a photodetector. In this method, the local oscillator (LO) signal is split into two parts by a power splitter. One part is input into the X-DPMZM to obtain the carrier suppression +1st order sideband of the LO signal. The other part is controlled by an RF switch. When the RF switch is off, the Y-DPMZM only outputs an optical carrier; when the RF switch is on, the Y-DPMZM outputs the -1st order sideband of the LO signal. Then, two orthogonally polarized signals are input into the PDC-PM, which is driven by two independent coding signals. When the amplitude and mode of the coding signals are changed, a binary or quaternary phase-coded signal with a carrier frequency equal to or twice that of the LO signal can be obtained through a photodetector.

The invention discloses a microwave photon beam forming network architecture based on a switch switching type optical adjustable true delay line and a phased array radar system thereof. According to the framework, microwave signals are modulated in an optical domain, and the characteristics of a plurality of adjustable delay paths in a single-channel switch switching type delay line are utilized, so that delay difference adjustment of multiple paths of optical signals is realized, the number of delay lines and delay units is greatly reduced, and meanwhile, high-precision and broadband beam-strabismus-free beam forming is supported; through two-stage or multi-stage delay configuration, the network can flexibly meet the broadband delay compensation requirements of different array antenna units, has low complexity and strong dynamic reconfigurable capability, is suitable for realization of a large-scale photonic integrated chip, reduces the number of delay lines by about 50%, does not generate frequency dispersion, and is suitable for large-scale photonic integrated chips. The system complexity, the cost and the power consumption can be remarkably reduced, and the method is particularly suitable for broadband phased array systems of millimeter waves, satellite communication, radar detection and the like.

The invention provides a broadband tunable microwave photon phase shifting device, and relates to the field of microwave photons, and the device comprises a power divider which is used for dividing an input radio frequency signal into a first radio frequency signal and a second radio frequency signal; the optical transmitting module is used for generating a first optical carrier signal and a second optical carrier signal; the reference signal module is used for performing power adjustment and phase shift on the second radio frequency signal to obtain a reference radio frequency signal, and modulating the reference radio frequency signal to the second optical carrier signal to obtain a reference optical signal; the delay signal module is used for modulating the first radio frequency signal onto the first optical carrier signal to obtain an optical modulation signal, and delaying the optical modulation signal to obtain a delayed optical signal; the delay optical signal and the reference optical signal are interfered in the beam combiner to obtain a synthesized optical signal; the true delay module is used for tuning the phase of the synthetic optical signal to obtain a delay synthetic optical signal; and the photoelectric conversion module is used for converting the delay synthesis optical signal into an output radio frequency signal.

An apparatus and method for cancelling leakage interference of phased array antenna based on microwave photonic. The apparatus consists of a signal generation unit, a splitter, a beaming unit, a transmitting antenna, a receiving antenna, a microwave photonic channel construction array, a control unit, a combiner array, and a signal receiving unit. The receiving antennas are divided into several receiving subarrays, and the microwave photonic channel construction unit corresponds to each receiving subarray, respectively. For each receiving subarray, a reference channel is constructed by adjusting the array of amplitude adjustment unit, the array of time delay adjustment unit, and the array of phase adjustment unit in the microwave photonic channel construction array. Thus, the reference channel has the matched delay, equal amplitude response, and opposite phase response relative to the leakage interference channel, based on which the leakage interference of phased array antenna is cancelled.

The invention discloses a multi-frequency-band signal fusion microwave photon radar system and an implementation method thereof, and relates to the technical field of optical signal processing, and the system comprises a multi-frequency-band signal transmitting module which is used for generating a multi-frequency-band bandwidth radar signal; the m microwave photon dechirp receiving modules are used for receiving echo signals of three or more multi-band bandwidth radar signals in an optical domain; the multi-frequency-band signal fusion processing module is used for carrying out interpolation and filling of spectrum gaps on missing frequency bands among multiple frequency bands through a coherent fusion technology so as to realize fusion splicing of multi-frequency-band signals; m is the number of multi-band channels; according to the method, the broadband characteristic of the photon technology can be fully utilized, and the distance resolution of target detection is effectively improved under the condition that the bandwidth requirement of the radar waveform electrical generator is not increased through fusion processing of multi-band bandwidth radar signals.

The invention provides a terahertz generation chip based on a thin film lithium niobate platform and a preparation method of the terahertz generation chip, and belongs to the field of integrated optics and microwave photons. According to the chip, terahertz waves are generated by utilizing a second-order nonlinear difference frequency effect on thin-film lithium niobate, and phase matching of an optical field and a terahertz field is realized through parameter design of an optical waveguide structure of the lithium niobate layer and a terahertz waveguide structure of the silicon layer. The device comprises a nonlinear action layer, an isolation layer, a terahertz transmission layer and a substrate layer. Firstly, a silicon layer is thinned through a mechanical polishing process, then polytetrafluoroethylene is bonded to the bottom of the thinned silicon layer, finally, waveguide structure etching is carried out, a specific waveguide shape and size are constructed, and efficient generation and transmission of terahertz waves are achieved. The method has strong practical operability, and has wide application prospects in the fields of terahertz communication, spectroscopy, remote sensing and the like.

The invention discloses a non-coplanar traveling wave electrode electro-optical modulator, and relates to the technical field of microwave photonic devices and photoelectric measurement. A non-coplanar patch antenna and a thin-film lithium niobate optical waveguide structure are constructed into one device, and the patch antenna is directly used as a traveling wave electrode of the modulator; and direct conversion between a free space terahertz signal and an optical signal in the waveguide can be realized. Meanwhile, due to the introduction of the non-coplanar traveling wave electrode structure, the electric field component of the terahertz wave in the vertical direction of the electro-optical crystal can be enhanced, the electro-optical conversion efficiency of the device is effectively improved, the working bandwidth of the device is enhanced, and the space phase modulation problem of the terahertz wave can be effectively solved. The electro-optical sampling system based on the non-coplanar traveling wave electrode electro-optical modulator has the advantages of being wide in frequency band, high in anti-interference capacity and the like, efficient detection of terahertz waves can be achieved, and the technical advantages are obvious.

A high-speed switching N-bit path selection type silicon-based integrated microwave photon delay line comprises a wavelength tunable external cavity laser, an electro-optical modulator, an N-bit wavelength selection delay line and a photoelectric detector, and the wavelength selection delay line is composed of N + 1 2 * 2 wavelength interleavers and N groups of delay and reference waveguide pairs. After being modulated by a microwave signal, light output by the external cavity laser is input into the N-bit wavelength selection delay line and finally converted into a microwave signal through the photoelectric detector to be output. By switching the wavelength of the laser, high-speed switching of a delay light path can be realized, and then high-speed phase shifting of a microwave signal is realized. According to the scheme, the wavelength selection type delay line adopts a passive device design, and compared with a traditional optical switch type delay line, the wavelength selection type delay line is easy to realize low loss, does not need voltage regulation and control, and is low in overall system power consumption.