47 results about "Optoelectronic oscillator" patented technology

The invention discloses an optoelectronic oscillator which comprises a laser device used for outputting optical carriers. The laser device is connected with an optoelectronic circulation circuit for forming an optoelectronic mixing resonant cavity. The optoelectronic oscillator further comprises an injection phase-locking module and a stable control module, the injection phase-locking module is used for injecting a locking signal to the optoelectronic circulation circuit to achieve side-mode suppression, and the stable control module is used for pilot control so as to compensate delay fluctuation of the optoelectronic circulation circuit. The injection phase-locking module is arranged to inject the locking signal to the optoelectronic circulation circuit to achieve side-mode suppression, the stable control module is arranged to extract delay fluctuation of all devices of the optoelectronic circulation circuit and carry out corresponding delay fluctuation compensation, so that the aim of stabilizing oscillation frequency is achieved, and therefore low-phase-noise single-mode stable output of the optoelectronic oscillator is achieved. Due to the fact that pilot control and circulating oscillation locked by injecting the locking signal are carried out in different frequency bands, mutual interference is avoided, and the parasitic effect of control circuit noise on an oscillation signal is effectively avoided.

The invention provides a weak signal detection amplification system based on an optoelectronic oscillator and a detection amplification method thereof, and belongs to the technical field of microwavephotonics. The weak signal detection amplification system based on the optoelectronic oscillator comprises a laser, a beam splitter, a phase modulator, a high-nonlinearity optical fiber, a circulator,a photoelectric detector, a power divider, a coupler, an electric amplifier, an intensity modulator, an adjustable optical attenuator and a radio frequency source. Wherein the laser is connected withthe beam splitter, the beam splitter is respectively connected with the phase modulator and the intensity modulator, and the phase modulator, the circulator, the photoelectric detector, the power splitter, the coupler and the electric amplifier are sequentially connected end to end to form a loop; Wherein the intensity modulator, the variable optical attenuator and the circulator are sequentiallyconnected, the radio frequency source is connected to the intensity modulator, and the phase modulator is connected with the circulator through a high-nonlinearity optical fiber. By adjusting the radio frequency source and the adjustable optical attenuator, rapid and high-precision weak signal detection and amplification can be realized.

A method and system comprising:an optoelectronic oscillator comprising a light generator, a modulator, and at least one optical fiber, the optoelectronic oscillator operating to send a modulated carrier signal through the optical fiber into a target area and receive the return signal;a circuit for removal of the carrier frequency operatively connected to the oscillator comprising at least one phase shifter; at least one mixer operatively connected to the at least one phase shifter; at least control circuit operatively connected the at least one mixer and the at least one phase shifter for controlling the phase shifter and operating to cancel signals other than the sideband signals;a signal processor for processing the sideband signals to detect acoustical and / or vibrational signals from the target area. The method comprises sensing vibrational and / or acoustical signals for detection of acoustical and / or vibrational signals in the target area.

The invention provides a photonic-filtering-based optoelectronic oscillator, which adopts an amplified feedback laser (AFL) as an optical domain filter instead of a conventional electric domain filter. A longitudinal intermode beat frequency microwave signal of the AFL serves as a drive source of a modulator for modulating laser injected into the AFL to form a self-feedback oscillatory system to further realize high-quality microwave and optical clock output functions.

An integrated optoelectronic oscillator based on an optical injection whispering gallery mode laser comprises an electric injection whispering gallery mode laser, a main laser, an optical beam splitter, a high-speed photoelectric detector, a radio-frequency amplifier, a radio-frequency coupler and a radio-frequency filter, wherein the main laser is located in the optical path of the electric injection whispering gallery mode laser, the input end of the optical beam splitter is connected with the output end of the electric injection whispering gallery mode laser, the input end of the high-speed photoelectric detector is connected with the transmission end of the optical beam splitter, the input end of the radio-frequency amplifier is connected with the output end of high-speed photoelectric detector, the input end of the radio-frequency coupler is connected with the output end of the radio-frequency amplifier, the input end of the radio-frequency filter is connected with one output end of the radio-frequency coupler, and the output end of the radio-frequency filter is connected with the control end of the electric injection whispering gallery mode laser; all the components are manufactured on a substrate. According to the integrated optoelectronic oscillator based on the optical injection whispering gallery mode laser, on-chip optical interconnection of optical circuits is achieved.

The invention discloses a vibration information obtaining method based on an optoelectronic oscillator. The method comprises the steps that optical carrier waves generated by a light source in the optoelectronic oscillator are modulated through a single side band to obtain modulated optical signals; vibration information from a vibrator is picked up through an energy storage optical fiber of the optoelectronic oscillator and is loaded to the modulated optical signals to obtain optical signals carrying the vibration information; photovoltaic conversion and vibration are carried out on the optical signals carrying the vibration information to obtain vibration signals; digital demodulation is carried out on the vibration signals after the vibration signals are processed and collected, so that the vibration information is obtained. According to the vibration information obtaining method based on the optoelectronic oscillator, the long energy storage optical fiber of the optoelectronic oscillator serves as a sensing optical fiber, the sensitiveness of a sensor can be improved, the sensor is not affected by light-intensity variation of a laser device, and high-sensitiveness vibration signal measurement can be achieved.

An optoelectronic oscillator based optical pulse generation device comprises a laser, a modulator, a semiconductor optical amplifier, a coupler, a photoelectric detector, an electric filter and an electric amplifier. The input end of the modulator is connected with the output end of the laser. The input end of the semiconductor optical amplifier is connected with the output end of the modulator. The input end of the coupler is connected with the output end of the semiconductor optical amplifier, and the first output end is connected with a light sampling oscilloscope or an auto-correlator. The input end of the photoelectric detector is connected with the second output end of the coupler. The input end of the electric filter is connected with the output end of the photoelectric detector. The input end of the electric amplifier is connected with the output end of the electric filter, and the output end is connected with a radio frequency modulation port of the modulator. By means of the device, the produced optical pulse width can be changed, and the optical pulse repetition rate can be changed by tuning central frequencies of the filter.

The present disclosure provides a dual loop self injection locked optoelectronic oscillator having a single fiber in its both loops which generates a high Q microwave output signal with a very low phase noise and spurious harmonics levels. The circuit may comprise an optical coupler having different lengths of the output arms and two electronic paths, which form two feedback loops of the oscillator. The circuit may comprise a single fiber with high Q, an optical circulator, and an optical coupler, which serves as a reflector, and two electronic paths which form two feedback loops of the oscillator.

The invention discloses a broadband frequency expansion device for an optoelectronic oscillator. The broadband frequency expansion device comprises a narrowband optoelectronic oscillator, a frequencydivider, a first phase-locked loop and a second phase-locked loop. The narrowband optoelectronic oscillator is connected with input ends of the frequency divider and the first phase-locked loop. The input end of the second phase-locked loop is connected with output ends of the first phase-locked loop and the frequency divider. Frequency conversion is carried out on a signal output by the narrowband optoelectronic oscillator through the first phase-locked loop and the second phase-locked loop, and then the signal is output. According to the broadband frequency expansion device, the problem thattraditional frequency synthesized reference source phase noise cannot satisfy a quantity value transmission demand is solved; and through adoption of a multiloop frequency expansion technology, the problem that an output frequency of the optoelectronic oscillator is narrow and cannot satisfy a broadband calibration demand is solved.

The invention relates to an optical fiber temperature sensor demodulation system. The optical fiber temperature sensor demodulation system can solve the problems that the environmental adaptability ofan existing optical fiber temperature sensor system is poor, and factor changes such as the jitter of optical signals have great influence on the performance of the existing optical fiber temperaturesensor system. A hardware platform of the demodulation system includes a wide spectrum optical source, an optical fiber coupler, an electric adjustable optical fiber delay line, an optical fiber temperature sensing probe, an electro-optic modulator, a dispersion compensation fiber, a high-speed photodetector, a low-noise amplifier, a microwave power divider, a spectrum analyzer and a signal processing and display module. The optical fiber temperature sensor demodulation system is combined with an optical fiber Michelson interferometer and an optoelectronic oscillator to change the optical path difference of the interferometer through the change of temperature, thereby changing the center frequency of a microwave signal output by the optoelectronic oscillator and realizing the demodulationof an optical fiber temperature sensor. The temperature probe is simple in manufacturing, and temperature measurement can be achieved with ordinary single-mode optical fibers. The optical fiber temperature sensor demodulation system has the advantages of adjustable measurement sensitivity, high precision and simple measurement method.

A multi-mode optoelectronic oscillator (MM-OEO) includes an OEO cavity having an input for receiving an RF signal and an RF output. The OEO cavity includes a) a first laser having a first laser output, a second laser having a second laser output, b) a modulator having i) a first input coupled to the first laser output, ii) a second input coupled to the second laser output, iii) a third input, iv) a first modulator output ,and v) a second modulator output, c) a semiconductor optical amplifier (SOA) having an input coupled to the first modulator output and having an SOA amplified output, d) a photodetector coupled to the SOA amplified output and having an output, and e) a coupler having an input coupled to the photodetector output and having a first output coupled to the third modulator input and a second output, whereby an amplified RF signal is produced at the OEO RF output.

The invention belongs to the field of microwave photonics, and discloses a double-ring optoelectronic oscillator with a stable self polarization state. The double-ring optoelectronic oscillator comprises a light source, a light modulator, a double-ring structure and a photoelectric loop. The light input end of the light modulator is connected with the light source and is used for receiving a continuous light wave signal. The light input end of the double-ring structure with the stable self polarization state is connected with the light output end of the light modulator. The light output end ofthe double-ring structure is connected with the photoelectric loop. The output end of the photoelectric loop is connected with the power input end of the light modulator. Therefore a double-ring optoelectronic oscillation circuit which operates in a resonant frequency and has advantages of stable polarization state and compact structure is formed. The double-ring optoelectronic oscillator has better edge mold suppression ratio and furthermore can enlarge a loop Q factor. The double-ring optoelectronic oscillator has advantages of realizing the double-ring structure with the stable self polarization state by means of a 45-DEG Faraday rotating mirror and a reflective structure, greatly improving system stability without additional electric field devices, reducing fiber length by one half, realizing more compact integral structure, and satisfying a requirement for high stability of the signal in a modern microwave system.

The present invention details fabrication guidelines of integrated optoelectronic oscillators with frequency and phase stability, having higher frequency selectivity in a relatively small size (compared to the larger size of a higher order electrically realized RF filter), reduced temperature sensitivity, and minimized frequency drift. The integrated photonic components and RF oscillator may use Silicon photonics and microelectronic integration using CMOS and BiCMOS technology, eliminating the need for bulky and / or discrete optical and microwave components.

A wholly optically controlled phased array transmitter with integrated tunable optoelectronic oscillators, which are based on multi-wavelength optical sources and optical true time delay units, and optical time delay networks, having a multi-wavelength optical source, a first wavelength division multiplexer, a first optical splitter, a first electro-optic modulator, a second optical splitter, a first optical amplifier, a first optical time delay network, a photodetector, an electric amplifier, a DC-block, a second electro-optic modulator, a second optical amplifier, a second optical time delay network, an optical combiner, a second wavelength division multiplexer, an optical fibers, a photodetector array, a T / R component array, a microwave antenna array, a 1×2 optical switch, a 2×2 optical switch, a circulator, a third wavelength division multiplexer, a bundle of optical fibers with precise lengths, and a Faraday rotation mirror.

The invention discloses a microwave pulse generation device and method based on a time domain mode-locked optoelectronic oscillator, and relates to the technical field of photoelectricity. The microwave pulse generation device comprises a direct-current laser, a variable optical attenuator, an electro-optic intensity modulator, a direct-current power supply, a single-mode optical fiber, a photoelectric detector, an electric amplifier, an electric filter, an electric power divider, an electric modulator and a function generator. The electric modulator driven by an external electric signal is introduced into a photoelectric oscillation loop, a time-domain active mode-locking photoelectric oscillator is constructed, and phase locking between longitudinal modes in a cavity is realized, so that multi-mode oscillation is realized, and a high-carrier-frequency microwave pulse signal with low phase noise is generated. By setting the frequency of the external electric signal, the repetition frequency of the output microwave pulse signal can be changed.

The invention discloses a microwave oscillator based on a sapphire filter. The microwave oscillator comprises a laser unit 1, an electrooptical modulator 2, an optical fiber delay 3, the sapphire filter 4, an optical amplifier 5, an optical detector 6, a microwave amplifier 7 and a microwave power coupler 8, wherein the laser unit 1 is used for outputting an optical carrier wave signal; the electrooptical modulator 2 is used for modulating the optical carrier wave signal; the optical fiber delay 3 is used for regulating a phase between optical paths; the sapphire filter 4 is used for filtering an optical signal and an electric signal; the optical amplifier 5 is used for amplifying the optical signal filtered by the sapphire filter; the optical detector 6 is used for converting the amplified optical signal into the electric signal; the microwave amplifier 7 is used for amplifying the electric signal filtered by the sapphire filter, so that gain of the microwave oscillator is greater than an oscillation threshold value; and the microwave power coupler 8 is used for outputting a microwave signal. The microwave oscillator is an optoelectronic oscillator with an optical filter and an electric filter, and has the advantages of a compact structure, low cost, and low medium-far end phase noises.

The invention discloses an electric gain frequency-selecting cavity-based frequency tunable optoelectronic oscillator system. A single-loop OEO (optoelectronic oscillator) is combined with an electricgain frequency-selecting cavity formed by a microwave filter, electric attenuators, an electric phase shifter and the like; the signals of the electric gain frequency-selecting cavity can be locked to the electric injection of the free oscillation signals of the OEO, so that the output of system signals can be realized; the frequency of the output signals is determined by the electric gain frequency-selecting cavity for locking the mode of the OEO; the bias voltage of the electric phase shifter is adjusted, so that the frequency of microwave signals outputted by the electric frequency-selecting cavity can be changed; an optical delay line is adjusted, so that the oscillation starting mode of the single-loop OEO can be changed; the electric phase shifter and the optical delay line can be adjusted, so that the frequency tuning of the output signals can be adjusted; and the electric attenuators can be adjusted, so that the loop cavity gain of the OEO can be matched with the electric gainfrequency-selecting cavity, so that a side mode can be effectively restrained. The system is simple in structure. According to the system, the advantage of the low-phase noise of the single-loop OEOis reserved, the side mode can be effectively suppressed, and a new implementation method is provided for the frequency tunable OEO.

To solve the technical problem that the relative bandwidth of a conventional optoelectronic oscillator is generally not less than one thousandth as the working frequency of the microwave optoelectronic oscillator is high and the relative bandwidth is limited by engineering implementation, the invention provides an ultra-narrowband low-noise optoelectronic oscillator comprising a light source, a modulator, a light splitter, a long-delay light path, a short-delay light path, a first light receiver, a second light receiver, a power combiner, an amplifying coupler, and an auxiliary variable-frequency filter assembly. The beneficial effect is that the situation in which the phase noise performance of the conventional optoelectronic oscillator is constrained by the limitation on the length of loop delay due to wide loop bandwidth is overcome, and a novel method is provided for improving the phase noise of the optoelectronic oscillator.

The invention discloses a coupled optoelectronic oscillator. The coupled optoelectronic oscillator comprises an FP (Fabry-Perot) laser and an optoelectronic oscillation loop, wherein the FP laser is used for producing multi-longitudinal-mode lasing and sends the multi-longitudinal-mode lasing to the optoelectronic oscillation loop; the FP laser receives injecting signals produced by the optoelectronic oscillation loop, finishes mode locking under the driving of the injecting signals and produces the multi-longitudinal-mode lasing after mode locking; the optoelectronic oscillation loop is used for receiving the multi-longitudinal-mode lasing sent by the FP laser, producing injecting signals and injecting the signals back to the FP laser; further, the optoelectronic oscillation loop receives the mode-locked multi-longitudinal-mode lasing sent by the FP laser and outputs optical pulse signals and microwave signals according to the multi-longitudinal-mode lasing after mode locking. By the aid of the technical scheme, the system size is greatly reduced, the cost is reduced, high-frequency and low-threshold microwave oscillation can be obtained under the condition that a microwave narrow-band filter is not used, and the limitation of the microwave filter to working frequency is eliminated.

The invention provides a multi-mode optoelectronic oscillator with an adjustable free spectral range and a multimode signal generation method, and belongs to the technical field of microwave photonics. The multimode optoelectronic oscillator comprises a laser, an intensity modulator, an electrically tunable delay optical fiber, an erbium-doped optical fiber amplifier, a photoelectric detector, anelectric amplifier and a power divider, wherein the laser is connected with the intensity modulator, the intensity modulator, the erbium-doped optical fiber amplifier, the photoelectric detector, theelectric amplifier and the power divider are sequentially connected end to end to form a loop, and the electric-tuning delay optical fiber is used for connecting the intensity modulator with the erbium-doped optical fiber amplifier. According to the invention, the free spectral range of the generated multi-mode signal can be periodically changed, and the free spectral range of the multi-mode signal can be rapidly and continuously adjusted.

The invention relates to a signal long-distance transmission phase stabilization system based on an injection locking optoelectronic oscillator, and provides a local oscillator microwave signal long-distance stable-phase transmission implementation scheme with high frequency stability and low phase noise based on a passive compensation principle and an injection locking optoelectronic oscillator OEO microwave signal generation technology. On one hand, compared with a stable-phase transmission technology using an active compensation method, the scheme can be suitable for microwave signal transmission with a higher frequency band, a larger bandwidth and a better phase noise level. A traditional active compensation scheme has the disadvantage that an electric device limits the frequency band bandwidth and introduces electric heating noise. On the other hand, a common passive compensation scheme has the problems of relatively high phase noise level and the like, so that the short-term stability of a signal transmitted to a far end is limited. According to the invention, microwave signal stable-phase transmission can be applied more widely, and the defect of a traditional scheme on phase noise is made up.

The invention provides an optoelectronic oscillator based on a germanium modulator, and relates to the field of radio frequency components. The optoelectronic oscillator comprises an input spot-size converter, the germanium modulator and an output spot-size converter. The input spot-size converter, the germanium modulator and the output spot-size converter are integrated on the same chip which is arranged on an SOI wafer. The optoelectronic oscillator further comprises a light source. The light source is coupled to the germanium modulator through the input spot-size converter. The output spot-size converter is connected with the end B of an optical circulator. The end C of the optical circulator is connected with an optical fiber delay line, an erbium-doped fiber amplifier and the end A of an optical coupler in sequence. The end B of the optical coupler is connected with the end A of the optical circulator. The germanium modulator is connected with an electric band-pass filter which is connected with the end B of an electric circulator, the end C of the electric circulator is sequentially connected with an electric amplifier and the end A of an electric coupler, and the end B of the electric coupler is connected with the end A of the electric circulator. According to the optoelectronic oscillator based on the germanium modulator, active devices are highly integrated, the occupied space is small, the power consumption is low, and the cost of the optoelectronic oscillator is reduced.

A multi-mode optoelectronic oscillator (MM-OEO) includes an OEO cavity having an input for receiving an RF signal and an RF output. The OEO cavity includes a) a first laser having a first laser output, a second laser having a second laser output, b) a modulator having i) a first input coupled to the first laser output, ii) a second input coupled to the second laser output, iii) a third input, iv) a first modulator output, and v) a second modulator output, c) a semiconductor optical amplifier (SOA) having an input coupled to the first modulator output and having an SOA amplified output, d) a photodetector coupled to the SOA amplified output and having an output, and e) a coupler having an input coupled to the photodetector output and having a first output coupled to the third modulator input and a second output, whereby an amplified RF signal is produced at the OEO RF output.

A frequency-adjustable triangular wave generating device based on an optoelectronic oscillator comprises a light source, a polarization modulator, an optical coupler, a first polarization controller, a polarizer, a monomode optical fiber, a first photoelectric detector, a tunable narrow-band filter, a power amplifier, a second polarization controller, a polarization beam splitter, a tunable optical delay line, a polarization beam combiner and a second photoelectric detector, and the polarization modulator, the optical coupler, the first polarization controller, the polarizer, the monomode optical fiber, the first photoelectric detector, the tunable narrow-band filter, the power amplifier, the second polarization controller, the polarization beam splitter, the tunable optical delay line, the polarization beam combiner and the second photoelectric detector are connected with the light source in sequence. The input end of the tunable narrow-band filter is connected with the output end of the first photoelectric detector, and the input end of the tunable optical delay line is connected with an output port (2) of the polarization beam splitter. The cost of the frequency-adjustable triangular wave generating device is greatly reduced, microwave signals generated by the optoelectronic oscillator are good in quality and low in phase noise, and generated triangular waves are tunable in frequency.

The invention discloses a wide-range and high-accuracy absolute distance measurement instrument capable of rapidly switching based on OEO. The absolute distance measurement instrument comprises an instrument inner delaying module and a loop switching module, wherein a double-chamber switching optoelectronic oscillator structure is formed by connecting the instrument inner delaying module and the loop switching module through optical fiber and a cable. The absolute distance measurement instrument has the beneficial effects that a scheme for applying the principle of accumulation amplification to measurement of wide-range absolute distance length by using OEO is capable of carrying out wide-range absolute distance measurement with a measurement grade of km and can achieve extremely high measurement accuracy with a measurement grade of mm, the operation is simple and easy, the absolute distance measurement instrument can be widely applied to the fields such as industrial measurement and control and production of precision instruments, and in addition, the distance measurement system is high in interference resistance and high in hiding performance, and thus has an extremely good application prospect in the military field.

The invention relates to a new optical fiber temperature sensor demodulation method. The new optical fiber temperature sensor demodulation method can solve the problems that the environmental adaptability of an existing optical fiber temperature sensor system is poor, and factor changes such as the jitter of optical signals have great influence on the performance of the optical fiber temperature sensor system. The new optical fiber temperature sensor demodulation method is combined with an optical fiber Michelson interferometer and an optoelectronic oscillator to change the optical path difference of the interferometer through the change of temperature, thereby changing the center frequency of a microwave signal output by the optoelectronic oscillator and realizing the demodulation of an optical fiber temperature sensor. A temperature probe is simple in manufacturing, and temperature measurement can be achieved with ordinary single-mode optical fibers. An optical fiber temperature sensor demodulation system has the advantages of adjustable measurement sensitivity, high precision and simple measurement method.

The invention discloses a miniaturized photoelectric oscillator chip based on SIP packaging technology, comprising a photoelectric oscillator optical module, a photoelectric oscillator electrical module and a metal ceramic shell for packaging; the components of the optical module are sintered on a gold-plated surface by a gasket. On the bottom surface of the housing, the components of the electrical module are sintered on the bottom surface of the gold-plated housing by digging holes in the microstrip plate, and transmit signals through the microstrip plate; the optoelectronic oscillator chip presents modular isolation, and the optical module and the electrical module are isolated by a metal partition , and the light-absorbing material and the wave-absorbing material are respectively coated on the outside of the partition. Signals such as power supply and output of the optoelectronic oscillator chip are transmitted through the pins of the Ceramic Quad Flat Package (CQFP). The invention utilizes the SIP packaging technology to realize the chip-based three-dimensional integration of the low-phase noise photoelectric oscillator, realizes integrated, light and small, tunable, electromagnetic compatibility design, greatly reduces the volume and weight of the photoelectric oscillator system, and satisfies the future radar frequency synthesis system. Modularization, high reliability, miniaturization and other development needs.

The invention belongs to the technical field of microwave photonics, and specifically relates to an active mode-locked photoelectric oscillator, including: a laser, a feedback modulator module, an active modulator module, a microwave source, an optical fiber, an optical delay line, a photoelectric detector, and a filter The photoelectric oscillation loop formed by the combination of the module, the electric amplifier and the electric coupler; the active modulation of the optical signal by the active modulator module can lock the phase of the adjacent longitudinal mode, and the spectrum shape of the generated microwave signal is an equidistant comb shape. The center frequency of the filter module can adjust the center frequency of the output spectrum, and the microwave signal with high stability and low phase noise can be generated by using the characteristics of the photoelectric oscillator. The invention utilizes the principle of active mode locking to generate ultra-short microwave pulse sequences with low phase noise, balanced power, tunable frequency and comb-shaped frequency spectrum.

The invention discloses a high-integration frequency accurate tuning optoelectronic oscillator structure and a working method, the core of the structure is a high-efficiency integrated tunable microwave link, the structure mainly comprises a radio frequency amplifier, a phase-locked loop, an active loop filter, a voltage-controlled oscillator, a power divider and other devices, and the devices are integrated into a radio frequency module. Accurate tuning of the output frequency of the optoelectronic oscillator is achieved through the voltage-controlled oscillator and the phase-locked loop structure, the phase-locked frequency of the phase-locked loop is controlled through a serial port, the phase-locked frequency directly affects the output signal frequency of the optoelectronic oscillator, and according to the radio frequency link scheme, indexes such as the output frequency range, the frequency tuning precision and the volume power consumption are obviously improved; rapid frequency regulation and control can be realized, and the key technology of rapid tunable microwave photoelectric oscillation is broken through.