58 results about "Opto-electronic oscillator" patented technology

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 relates to a sweep frequency optical frequency comb generation system and a generation method. Fourier mode locking is realized through a Fourier mode locking photoelectric oscillator system. The sweep frequency optical frequency comb generation system is a closed Fourier mode-locked laser loop which is composed of a first optical amplifier, an optical fiber isolator, a broadband filter, a polarization controller, a thin film lithium niobate optical chip, a signal generator, a dispersion compensation optical fiber and a first optical coupler; and a photoelectric oscillator loop is formed by a second optical coupler, a single-mode delay optical fiber, a second optical amplifier, a photoelectric detector, a narrow-band filter, a low-noise amplifier and an electric power divider. Time domain active mode locking and Fourier mode locking are carried out on the laser resonant cavity at the same time, synchronous modulation of multiple optical frequency comb modes is achieved, sweep frequency optical frequency comb signals with high repetition frequency, high modulation speed, high coherence length and high output power are generated, and tunable optical frequency comb and high-quality high-frequency microwave signal output can be provided at the same time.

The invention discloses a phase coding optoelectronic oscillator with an adjustable duty ratio and an implementation method thereof, and relates to the technical field of photoelectricity. The optoelectronic oscillator comprises a laser, a Mach-Zehnder modulator, a single-mode fiber, a photoelectric detector, an electric amplifier, an electric band-pass filter and an electric power divider which are connected in sequence; a direct current port of the intensity modulator is connected with the function generator, one path of the electric power divider serves as output, and the other path is connected with a radio frequency port of the intensity modulator; the output voltage of the preset function generator jumps between the two linear bias points and the minimum bias point of the Mach-Zehnder modulator, so that the direct output of the phase-coded microwave signal with the adjustable duty ratio is realized. According to the invention, the coherence of the phase coding microwave signal is good, the phase noise is low, the duty ratio is adjustable, the coding flexibility is high, the structure is simple, and the equipment cost is low.

The invention provides a photoelectric oscillator capable of being used for frequency hopping microwave generation. The photoelectric oscillator is mainly composed of a laser, a polarization controller, a Mach-Zehnder modulator, a single-mode optical fiber, a photoelectric detector, an electric amplifier, a frequency mixer, an equivalent dual-band filter and a microwave source. Wherein the equivalent dual-band filter is obtained by connecting two narrow-band filters in parallel and serves as a frequency selection device of the optoelectronic oscillator system; hopping is carried out on the loop signal by utilizing the frequency mixer, so that frequency hopping of the loop signal is realized; compared with a traditional scheme, the system has a simpler system structure, the equivalent dual-band filter and the frequency mixer are utilized to enable a photoelectric oscillator loop to continuously perform frequency hopping and conversion, frequency hopping signal generation with loop time delay as a half cycle is realized, and the system has good application in the aspects of signal generation, pulse detection and the like.

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.

The application relates to a method of an electric field sensor based on an optoelectronic oscillator, belonging to the field of optical devices and optical fiber sensing. The device comprises a laser source, a polarization controller, a phase modulator, a fiber Bragg grating with an acrylate glue cavity, a stacked piezoelectric ceramic, an electric field generator, an erbium-doped fiber amplifier, a photodetector, a power divider and an electric amplifier. The stacked piezoelectric ceramic is combined with the fiber Bragg grating with the acrylate glue cavity as a sensing head, the wavelength change of the fiber Bragg grating with the acrylate glue cavity caused by the piezoelectric effect is mapped to the frequency change of the microwave signal generated by the optoelectronic oscillator, and the electric field change value can be obtained by monitoring the microwave signal of the optoelectronic oscillator. In the loop of the optoelectronic oscillator, the electric spectrum analysis technology is used for demodulation, and high-speed and high-resolution electric field measurement can be obtained. The method has the advantages of simple structure, high measurement sensitivity and easy practicability.

This invention discloses a low-phase-noise arbitrary waveform generation system based on an injection-locked optoelectronic oscillator. It utilizes a dual-polarization Mach-Zehnder modulator to simultaneously realize the injection-locked optoelectronic oscillator and optical domain frequency quadruple, enabling simultaneous microwave signal generation and signal frequency multiplication. The frequency bandwidth of the generated signal is not limited by the injected signal, thus realizing the generation of ultra-wideband signals.

The invention relates to a generation system and a generation method of a three-band coherent microwave signal. The system comprises a laser, an electro-optical modulator, an optical fiber ring, a photoelectric detector, a first bridge, a second bridge, a first broadband filter, a second broadband filter, a third broadband filter, a tunable filter, a first amplifier, a second amplifier, a third amplifier, a fourth amplifier, a coupler, an external signal source, a signal generator and the like. The generating system disclosed by the invention is a Fourier domain mode-locked photoelectric oscillator system for generating coherent microwave signals of three frequency bands based on difference frequency injection locking, and a Fourier domain mode-locked photoelectric oscillator autonomously-generated signal is combined with an external injection signal; therefore, multiple frequency band sweep frequency signals with good coherence and strong tunability can be output at the same time. The generated microwave signals of three frequency bands have good tunability and coherence, and the formed three-loop Fourier domain mode-locked optoelectronic oscillator system can be applied to multiple fields.

The invention discloses an all-optical microwave oscillator based on a non-polarized radial mode LN-PM birefringence effect, which is used for solving the technical problem that an electronic bottleneck of high frequency and low stability is difficult to break through due to the fact that additional noise is extremely easy to generate due to introduction of an electric signal in a traditional photoelectric oscillator, and belongs to the technical field of optical fiber communication and microwave photonics. The birefringence effect of LN-PM is introduced into the microwave photonic oscillator based on forward Brillouin scattering, the gain and loss coefficient of forward Brillouin are controlled by adjusting a polarization controller, and when the gain coefficient is equal to the loss coefficient and greater than a coupling coefficient, the space time is symmetrically broken to obtain single longitudinal mode microwave photon output. Compared with the prior art, the self-excited pumping source is adopted, electric signal modulation is not needed, a single-frequency microwave photon signal which is high in frequency stability, low in phase noise and high in side-mode rejection ratio can be generated, and the system has the advantages of being simple in structure and higher in adaptability and reliability.

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 invention provides a photoelectric oscillator capable of being used for generating tunable phase coding microwave pulses. The photoelectric oscillator is composed of a tunable laser, a polarization controller, a phase modulator, a dual-drive Mach-Zehnder modulator, an optical circulator, a phase shift fiber bragg grating, a single-mode fiber, a photoelectric detector, an electric amplifier, a microwave source and an arbitrary waveform generator. The invention develops the active mode-locked photoelectric oscillator for generating the phase-coded microwave pulse signal, which is simple in structure and good in tunability. On the basis of an active mode-locked optoelectronic oscillator, a phase modulator is driven by a phase coding signal, so that the duration of each voltage polar code is kept consistent with the loop delay of the optoelectronic oscillator, and a phase-coded coherent microwave pulse sequence is generated. The signal has the advantage of large time bandwidth product, can give consideration to the detection distance and distance resolution of the radar, and has the characteristics of interference resistance, low interception and the like.

An optoelectronic oscillator (100) and a signal processing method, which relate to the technical field of optoelectronics. In the optoelectronic oscillator (100), an electro-optical modulator (110), an optoelectronic detector (120), a first filter (130) and a power divider (140) form an optoelectronic oscillation loop. Compared with a conventional single-passband filter, the first filter (130) in the optoelectronic oscillation loop has an additional low-frequency passband, and thus can excite a pulse train of the low-frequency passband and a pulse train of a bandpass band in the optoelectronic oscillation loop. Since the oscillation of a pulse signal can automatically narrow a pulse train to form an ultrashort pulse train, when the pulse train excited by the bandpass band has undergone pulse narrowing by means of an oscillation mechanism in the optoelectronic oscillation loop, the pulse train excited by the low-frequency passband may further undergo pulse narrowing, such that the optoelectronic oscillator (100) can generate a microwave pulse train which is shorter than that of a conventional optoelectronic oscillator, that is, an ultrashort microwave pulse train.

The invention discloses a high-sensitivity magnetic field sensor based on a coupled optoelectronic oscillator. Comprising a first circulator, a magnetostriction piece used for sensing changes of external magnetic field intensity, a first sensing unit arranged on the magnetostriction piece, a coupler, a photoelectric detector, an electric filter, an electric power divider, an electro-optical modulator, a spectrum analyzer, a second circulator and a second sensing unit, the second end is connected with the first sensing unit, the third end is connected with the input end of the coupler, the first output end of the coupler is connected with the input end of the electric power divider through the photoelectric detector and the electric filter in sequence, and the two output ends of the electric power divider are connected with the electrooptical modulator and the spectrum analyzer respectively; the second output end of the coupler is connected with the first end of the second circulator, the second end of the second circulator is connected with the second sensing unit, and the third end of the second circulator is connected with the electro-optical modulator. The system is high in sensitivity and strong in anti-interference capability.

This invention discloses a novel self-oscillating optical frequency comb generator, an OEO loop A, used in conjunction with a continuous spectrum laser and a photoelectric oscillator to generate an optical frequency comb; a signal separation component, connected to the OEO loop A via a 1x15 optical demultiplexer A, used to generate real and imaginary signals; a transmission channel, connected to the signal separation component via a 1x15 optical demultiplexer B, used for signal transmission; and a decoding component, connected to the transmission channel, used to recover the real and imaginary signals and perform decoding processing. The OEO loop A includes a single-mode fiber A, a PIN photodetector, an electrical amplifier A, and a bandpass Bessel filter. This invention demonstrates strong and clear constellation diagrams for receiving signals in a 300Gbps 116-QAM transmission and reception channel over uncompensated fiber optic links of standard single-mode fiber (80km to 240km), exhibiting high applicability in coherent optical communication.

The invention relates to a signal recovery method, system and device based on a space-time interconnection photoelectric reservoir computing architecture and a medium, and the method comprises the steps: constructing a photoelectric reservoir network based on small time delay feedback: introducing one path of a modulation optical signal into a time delay feedback loop, and forming a photoelectric oscillator; the total delay of the time delay feedback loop is divided into a plurality of time slots at equal intervals, each time slot serves as a virtual node, and a time division multiplexing reservoir state matrix is constructed in a time domain; sampling an output signal of the photoelectric oscillator, and performing serial-parallel conversion to output K paths of spatial parallel optical signals; inputting the spatial parallel optical signals into an integrated space photon processing platform, and performing product operation of a reservoir state matrix and an output weight matrix; and receiving the optical signal output by the integrated space photon processing platform in parallel and converting the optical signal into an electric signal to obtain a prediction output result of the target signal. Compared with the prior art, the system has the advantages of high speed, low power consumption and high expansibility.

The invention provides a self-starting Fourier domain mode-locked optoelectronic oscillator and a method. The oscillator comprises a sweep-frequency light source used for generating sweep-frequency light with the wavelength changing along with time; the photoelectric oscillation loop comprises a phase modulator, a long optical fiber, a notch filter, an optical detector and an electric amplifier, and the output end of the optical detector is connected with the input end of the phase modulator through the electric amplifier to form a closed loop; the sweep frequency light generates a carrier wave and two sidebands through phase modulation, a notch filter filters one sideband, and residual optical signals are converted into microwave signals through an optical detector after being delayed in a long optical fiber and are fed back to a phase modulator through electric amplification; the microwave power detector monitors loop output power in real time; the control unit adjusts the sweep frequency period of the sweep frequency light source according to the monitoring result, searches and locks a target period enabling the microwave signal power to be maximum, and achieves the self-starting of Fourier domain mode locking.

The application discloses a kind of light microwave source system and method, the system includes light signal generation module, for generating CPT phenomenon, output optical filtered laser beam;Photodetector, for converting optical signal into electrical signal;Electric signal adjustment module, for amplifying the electrical signal output by photodetector, and carry out beam splitting;Crystal oscillator locking module, including crystal oscillator, for the second road signal after beam splitting is modulated and input to frequency divider, with the signal output by crystal oscillator after frequency division is phase detected and forms error check signal, crystal oscillator locking module generates the microwave signal of the microwave source system;PID control module, for processing error check signal, forms voltage control signal to control voltage control phase shifter.The application has the stability of CPT atomic clock and the advantage of low phase noise of photoelectric oscillator, improves the stability of microwave signal, can provide high-stability and low-phase-noise microwave and time frequency signal.

The present application relates to a kind of multi-band reconfigurable fourier mode-locked optoelectronic oscillator, its structure includes laser, electro-optic modulator, photodetector, first A low noise amplifier, first multiplexer, second multiplexer, filter amplification branch, arbitrary waveform generator and electric power divider etc., wherein, first multiplexer, second multiplexer, the N filter amplification branches connected therebetween and arbitrary waveform generator jointly constitute multi-band reconfigurable filter module.The present application sets up multiple filter amplification branches in optoelectronic feedback oscillation loop, thereby constructs a multi-band fourier mode-locked oscillation loop cavity, the frequency range and period of multi-band reconfigurable microwave signal are determined by the sweep width and period of tunable filter in each filter amplification branch in multi-band reconfigurable filter module.Thereby for anti-radar or anti-jamming communication system provides a high-quality microwave signal source.

The application discloses a chaotic signal generation method based on chaotic sequence modulation and belongs to the technical field of microwave photonics. The method is characterized in that: a chaotic time sequence signal is used to modulate the intensity of a continuous light signal, and the obtained modulated light signal is input into an optoelectronic oscillation loop, so that a chaotic signal with eliminated time delay characteristics is output from the optoelectronic oscillation loop; the chaotic time sequence signal is a periodic signal with an ideal chaotic signal waveform in a single period. The application further discloses a chaotic signal generation device based on chaotic sequence modulation. Compared with the prior art, the application can solve the problem that a chaotic optoelectronic oscillator has obvious time delay characteristics at a low cost, and the generated signal characteristics are stable and are not affected by the bias point drift of a modulator.

The invention relates to an optoelectronic oscillator (1) comprising at least one electro-optical conversion unit (LD1), which emits light that can be modulated during operation, and a photoelectric conversion unit (PD1), on which part of the light from the electro-optical conversion unit (LD1) impinges during operation, and on which part of the light from the electro-optical conversion unit (LD1) impinges on the photoelectric conversion unit (PD1). Light irradiated by the electro-optical conversion unit (LD1) generates a modulation electric signal in the photoelectric conversion unit (PD1), and the modulation electric signal is used for controlling modulation of light emitted by the electro-optical conversion unit (LD1) to form oscillation during operation.

The invention provides a chaotic optoelectronic oscillator time delay characteristic suppression method based on the synergistic effect of a dispersion effect and a wide-spectrum light source. The laser source generates high-stability continuous optical signals, and the polarization state of the continuous optical signals is adjusted through the polarization controller so as to be matched with a polarization sensitive axis of the Mach-Zehnder modulator. The MZM serves as a nonlinear core device, and intensity modulation is carried out on feedback electric signals through a nonlinear transmission function of the MZM. An optical signal output by the MZM is divided into two paths through a first optical coupler, wherein one path enters a monitoring system and is output as a chaotic signal; and the other path enters a photoelectric feedback loop. In a feedback loop, an optical signal firstly enters an erbium-doped optical fiber amplifier for power compensation so as to offset insertion loss caused by subsequent long-distance optical fibers; and then entering a dispersion link formed by cascading a dispersion compensation optical fiber and a standard single-mode optical fiber. According to the invention, by introducing the dispersion link and utilizing the time delay characteristic related to the frequency, the suppression level is improved by about 22.6 dB, and the confidentiality and randomness of the system are greatly enhanced. The structure is simple and standardized.

The invention provides a phase shift fiber bragg grating ultrasonic detection system and method based on a photoelectric oscillator, a terminal and a medium, and relates to the technical field of microwave photonic fiber sensing, and the system comprises a laser, a polarization controller, a photoelectric self-oscillation loop, a phase shift fiber bragg grating, a down-conversion module and a high-speed data acquisition module. Laser signals generated by the laser device are output to the loop after passing through the polarization controller, when phase shift peak shift occurs to an optical grating connected with one end of an optical circulator in the loop under the action of ultrasonic signals, the loop outputs two paths of target microwave signals in a beam splitting mode, one path reaches the phase modulator to maintain the oscillation condition, and the other path is processed by the down-conversion module and then is transmitted to the optical circulator. The high-speed data acquisition module acquires and analyzes frequency domain sideband modulation signals of the signals, and the recovery and quantitative detection of the ultrasonic signals are realized through demodulation. The optical domain wavelength offset is converted into the modulation characteristic of an electric domain microwave signal through a loop, the limitation of the traditional measurement range is broken through, and the ambient temperature interference can be inhibited.

This application discloses a signal detection system, comprising: a frequency estimation device and a signal detection device; the output terminal of the frequency estimation device is connected to the input terminal of the signal detection device. The system can generate a chaotic photoelectric oscillator radio frequency signal by estimating the frequency of the incident signal and the optical carrier signal based on environmental conditions. Then, the chaotic photoelectric oscillator radio frequency signal is used to detect the target signal (i.e., a weak microwave photon signal). Therefore, the system can achieve the reception of weak signals within a large dynamic bandwidth, overcoming the shortcomings of traditional signal detection methods, such as narrow operating bandwidth and low detection sensitivity.

The invention provides a photoelectric oscillator and a signal processing method. The invention relates to the technical field of photoelectricity, and in the photoelectric oscillator, an electro-optical modulator, a photoelectric detector, a first filter and a power divider form a photoelectric oscillation loop. Compared with a conventional single-passband filter, the first filter in the photoelectric oscillation loop has the advantages that a low-frequency passband is added, and a pulse sequence of the low-frequency passband and a band-pass passband can be excited in the photoelectric oscillation loop. Due to the fact that oscillation of the pulse signal can automatically narrow the pulse sequence to form the ultra-short pulse sequence, on the premise that the pulse sequence excited by the band-pass passband passes through an oscillation mechanism in the photoelectric oscillation loop to narrow the pulse, the pulse sequence excited by the low-frequency passband can further narrow the pulse, and the ultra-short pulse sequence is formed. Therefore, the photoelectric oscillator can generate a microwave pulse sequence which is shorter than that of a conventional photoelectric oscillator, namely an ultra-short microwave pulse sequence.

The invention discloses a broadband chaos generation method based on a dual-drive Mach-Zehnder modulator, and the method specifically comprises the steps: employing two chaos generation systems, firstly building a conventional photoelectric oscillation system through employing a continuous wave semiconductor laser, an MZM, a photoelectric detector, and a radio frequency amplifier; chromatic dispersion is introduced into the photoelectric feedback loop to enhance the chaos complexity and reduce the time delay characteristic of the generated chaos; and then, small-bandwidth chaos generated by a traditional optoelectronic oscillator is used as a radio frequency modulation signal of the DDMZM in a second chaos generation system, and the bias voltage of the DDMZM is adjusted to enable the DDMZM to work in a nonlinear region, so that the bandwidth of the modulated intensity chaos is broadened under the action of high nonlinearity. According to the invention, broadband chaotic signals can be generated, time delay characteristics can be hidden in background noise, the complexity of the chaotic signals is effectively increased, the chaotic power spectrum is flat, the spectrum energy is uniform, and ultra-high-speed physical random numbers can be generated.

The invention relates to a distributed high-integration optoelectronic oscillator system, which comprises an optoelectronic oscillator center end and a plurality of far ends, and is characterized in that the optoelectronic oscillator center end comprises a continuous wave laser module, an electro-optic intensity modulator module, a long optical fiber ring, an optical coupler, a 1 * n light beam splitter, a photoelectric detector, two low additional phase noise amplifiers and a band-pass filter; the far end comprises a photoelectric detector; output light of the electro-optic intensity modulator module is output to the input end of the long optical fiber ring, the output end of the long optical fiber ring is connected with the input end of the optical coupler, and the output end of the optical coupler is connected with the photoelectric detector and the 1 * n light beam splitter. The output end of the photoelectric detector is sequentially connected with the first low additional phase noise amplifier, the band-pass filter and the second low additional phase noise amplifier and then connected to the electro-optic intensity modulator module, and the 1 * n light beam splitter divides signals into n paths and transmits the n paths to a far-end system. The requirements of distributed coherent measurement, multi-aperture photoelectric sensing and the like on a distributed microwave source can be met.

This invention provides a sensitivity-enhanced temperature measurement device based on an optoelectronic oscillator, comprising: a laser, an intensity modulator, a delay line interferometer, a sensitive arm fiber optic unit located in the space where the signal to be measured is located, a reference arm fiber optic unit, a photodetector, a microwave amplifier, a bandpass filter, a power divider, and a frequency measurement section. The intensity modulator generates an optical signal containing two frequency components: a carrier wave f0 and a first-order single-sideband wave f1. The delay line interferometer then separates these two frequency components, allowing them to propagate separately along the reference arm and sensitive arm fibers. These components are then returned to the delay line interferometer and combined to output an optical signal whose phase contains the temperature signal to be measured. The phase change of the optical signal caused by the temperature signal to be measured is then converted into a frequency change in the microwave signal output by the optoelectronic oscillator. This invention also provides a sensitivity-enhanced temperature measurement method. The device provided by this invention can effectively improve the sensitivity of temperature detection.

The application discloses a three-frequency signal generation system and method based on an integrated optoelectronic oscillator, which comprises a laser, a first optical coupler, a loop one, a loop two, a second optical coupler and a third photoelectric detector, and two uploading and downloading type micro-ring resonators are contained in the loop one and the loop two. The system generates two microwave signals with different frequencies through the laser, the first optical coupler, the loop one and the loop two, and combines two light signals filtered out from the downloading ends of the two micro-ring resonators through the second optical coupler and outputs the combined light signal to the third photoelectric detector for frequency beating to generate a third microwave signal, and the frequency of the third microwave signal is the sum or difference of the frequencies of the first and second microwave signals. The application can generate a high-quality three-frequency signal with adjustable frequency, realizes the miniaturization and integration of the optoelectronic oscillator, reduces the volume and weight of the optoelectronic oscillator system, lowers the system cost and is suitable for more application scenarios.

The application discloses a reconfigurable time-frequency domain mode-locked optoelectronic oscillator, and belongs to the technical field of microwave photonics. The oscillator comprises a waveform generator, a laser, a modulator, a filter, an adjustable attenuator, an optical fiber, an optoelectronic detector, an electric amplifier and an electric power divider. The waveform generator generates an electric control signal to control the injection current of the laser. The wavelength and power of the continuous light output by the laser change with the amplitude of the electric control signal generated by the waveform generator. The continuous light output by the laser enters the modulator to generate a modulated light signal, and then enters the filter for filtering. The filtered modulated light signal is transmitted through the adjustable attenuator and the optical fiber, and then enters the optoelectronic detector. The optoelectronic detector performs photoelectric conversion to generate a microwave signal. The microwave signal is amplified by the electric amplifier, and then enters the electric power divider. In the electric power divider, the microwave signal is divided into two paths. One path is fed back to the modulator, and the other path is output as the output of the optoelectronic oscillator. The reconfigurable mode-locked optoelectronic oscillator is generated by using the waveform generator, the adjustable attenuator and the fast adjustable microwave photon bandpass filter. Compared with the optoelectronic oscillator which can only work in one mode-locked state, the optoelectronic oscillator of the application can be flexibly switched among the frequency domain mode-locked optoelectronic oscillator, the time domain mode-locked optoelectronic oscillator and the time-frequency domain mode-locked optoelectronic oscillator.

The application discloses a tunable optoelectronic oscillator based on a DML-SOA laser chip and belongs to the technical field of semiconductor processes. The tunable optoelectronic oscillator comprises a self-feedback laser, the self-feedback laser encapsulates a DML-SOA laser and an optical isolator in a butterfly tube shell, and is sequentially connected with an optical time delay line and an optoelectronic detector through an optical path, the optoelectronic detector is connected with an electrical amplifier through an electric circuit, the electrical amplifier is connected with an electrical coupler through an electric circuit, one of the electrical coupler is connected with a Bias-T through an electric circuit, the other of the electrical coupler is used as a microwave signal output, and a direct-current power supply is connected with the Bias-T and the self-feedback laser simultaneously. The tunable optoelectronic oscillator has the characteristics of compact structure, high signal-to-noise ratio and low phase noise, can realize a P-1 oscillation phenomenon with adjustable frequency interval through simple electrical injection tuning, and has a wide application prospect in the field of optoelectronic integration and microwave signal generation.