39 results about "Microwave photonics" patented technology

The invention discloses a device and a method for realizing frequency measurement of multifrequency microwave signasl by using stimulated Brillouin scattering. At present, the microwave photonics based researches on microwave frequency measurement are only suitable for single-frequency microwave signals and limited in resolution ratio. According to the invention, the phase of a multifrequency microwave signal to be measured is modulated onto light, the phase-modulated double-sideband signal is optically processed with a frequency-sweep carrier-suppression double-sideband signal by using the stimulated Brillouin scattering to obtain a selective single-sideband optically modulated signal, meanwhile, the detections on the frequency-sweep signal and the microwave power of the modulated signal are synchronized. When the microwave power can be detected, the frequency difference between the frequency of the sweep frequency and optical fiber Brillouin frequency shift is the frequency of the unknown microwave signal at the moment. The device and the method disclosed by the invention inherit the general advantages of microwave photon measurement, can be used for measuring all frequency information of microwave signals containing multifrequency information and simultaneously has very high resolution ratio.

The invention discloses a microwave signal phase shifting method based on polarized light interference technique in the technical field of microwave photonics. Photonic microwave signals generated by modulating a single sideband are transmitted by a polarization maintaining fiber and generate a group of optical carrier with locked phase and vertical polarization in a polarization manner by using the high birefringence characteristics and an appointed fusion angle. The input vertically-polarized optical carriers can generate different phase shift under the bias voltage of a phase modulator according to the polarization relativity of the modulation efficiency of the phase modulator, so that the phase difference among the optical carriers can be changed by adjusting the bias voltage. Then, the optical carriers are received by an analyzer with an appointed polarization angle to generate a group of parallel-polarized phase-shifting optical carriers. A photoelectrical detector can generate an electrical domain microwave phase-shifting signals after receiving beat frequency and isolating DC components, wherein the phase shifting magnitude depends on the bias voltage of the phase modulator. The invention further lowers the complexity of the microwave phase shifting system, and improves the phase shifting accuracy.

The invention discloses terahertz wave generating device and method based on optical four-wave mixing effect, which belong to the technical field of microwave photonics. The method comprises the following steps of: driving an intensity modulator by a microwave source signal through electric frequency multiplication by using optical carrier suppression modulation of the external intensity modulator and the four-wave mixing effect in a nonlinear device, forming a carrier suppression signal with only two first-order side bands, then forming two new side bands through the nonlinear device, filtering the original first-order side bands by an optical filter, only retaining two new side bands and carrying out beat frequency on the two new side bands in a PD (Photo Detector) to generate a terahertz wave frequency with six frequency multiplications. The invention lowers the requirements of the microwave modulation signal frequency and the modulator band width and reduces the cost of a system, the generating device has simple structure and favorable portability and the generated terahertz wave has very high stability.

The invention belongs to the technical field of microwave photonics, and particularly relates to a microwave signal measuring method based on rapid laser scanning. According to a measuring system, optical scanning is used as local oscillation, a plurality of receiving information channels with series time domains are built, balance detection and demodulation are performed on microwave signals to be measured, and wide-band microwave measurement and analysis can be performed within microsecond-order time. When series channelization receiving is performed, frequency beating is performed on the modulated signals to be measured and a frequency sweeping source on a photoelectric detector; when the receiving bandwidth is equal to the frequency sweeping interval, the modulated microwave signals to be measured with the frequency difference being less than delta f with the sweeping frequency can be detected in corresponding information channels after frequency beating is performed on the frequency sweeping source. According to the method, the adopted series channelization receiving mechanism has great advantages in structure, only one low-speed detection device can achieve signal receiving of all the information channels, and the series channelization receiving system can achieve very high measuring speed.

The invention discloses a multi-frequency microwave signal photon instantaneous frequency measuring device with a super-wide frequency range, and belongs to the technical field of microwave photonics. The multi-frequency microwave signal photon instantaneous frequency measuring device with the super-wide frequency range comprises a laser, a coupler, a phase modulator, a polarization controller, a highly nonlinear optical fiber, a circulator, a first double-parallel MZ modulator, a second double-parallel MZ modulator, an intensity modulator, a microwave coupler, a photoelectric detector and a network analysis instrument. First-order upper side band signals output by the phase modulator are strengthened or weakened through the stimulated Brillouin scattering effect of the highly nonlinear optical fiber, the intensity balance of the first-order upper side band and the first-order lower side band of the output signals of the phase modulator is broken, and therefore instantaneous frequency measurement of multi-frequency microwave signals to be measured is achieved.

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.

The invention discloses a photon upconversion method and system based on microwave frequency quadruplication and belongs to the field of microwave photonics. Optical carriers generated by a laser areinput into a first double-parallel Mach-Zehnder modulator. An upper arm submodulator is modulated through utilization of local oscillator signals. Through adjustment of direct current bias of the modulator, the modulator is enabled to work a carrier suppressed maximum transmission point. Modulated optical signals enter a fiber bragg grating through an optical circulator. Through utilization of wavelength selectivity of the fiber bragg grating, positive second-order optical sidebands of a local oscillator are transmitted and are taken as carriers to enter a second double-parallel Mach-Zehnder modulator. Negative second-order optical sidebands of the local oscillator are reflected and are collected through utilization of the optical circulator. Intermediate frequency signals are loaded to the second double-parallel Mach-Zehnder modulator through utilization of a 90-dgree electric bridge, and carrier suppressed single-sideband modulation is realized through utilization of the direct current bias. Two optical paths are combined, power amplification is carried out on the optical signals, and insertion losses of the modulator are compensated. Frequency beating is carried out through utilization of a photoelectric detector, thereby obtaining frequency quadruplicated upconversion signals.

The invention discloses a microwave photon up-conversion device and method based on a photoelectric oscillator and belongs to the technical field of microwave photonics. The device is composed of a laser source, a first coupler, a first circulator, a first high nonlinearity dispersion displacement optical fiber, an erbium-doped optical fiber amplifier, a first photoelectric detector, a second coupler, a first Mach-Zehnder modulator, a first microwave signal source, a first direct current voltage-stabilized power supply, an optical filter, a second Mach-Zehnder modulator, a second direct current voltage-stabilized power supply, a second circular, a second high nonlinearity dispersion displacement optical fiber, a second photoelectric detector, a microwave amplifier, a double-parallel Mach-Zehnder modulator, a third direct current voltage-stabilized power supply, a fourth direct current voltage-stabilized power supply, a fifth direct current voltage-stabilized power supply, an optical isolator and a spectrum analyzer. A Brillouin frequency shift value f of the high nonlinearity optical fiber is 9.2GHz, and a signal with frequency of f<m> can be up converted to f<m>+18.4GHz, so alow quality and low frequency intermediate signal is converted into a high quality and high frequency signal.

The invention relates to a microwave photon millimeter wave ultra-wideband signal generation method and device based on up-conversion, belonging to the technical field of microwave photonics. A lasersource, a polarization controller, an arbitrary waveform generator, a microwave signal source, a dual-parallel Mach-Zehnder modulator, an erbium-doped fib amplifier, an optical isolator, a first annulator, a single-mode optical fiber, a second annulator, a photodetector and a spectrum analyzer constitute the device. The invention is based on the up-conversion technology to generate the signal at 22GHz-29GHz millimeter wave UWB signal, the upconversion realized by SSB modulation can overcome the dispersion effect in single-mode fiber, so that the UWB signal can be transmitted over long distance. Single sideband modulation using secondary Brillouin scattering is simple and easy to implement. Moreover, the amplification of Brillouin gain and the attenuation of loss make the spectrum of the generated UWB signal satisfy the power spectral density mask specified by the Federal Communications Commission of the United States.

The invention provides an integrated optoelectronic device based on sideband injection locking and used for generating high-frequency microwaves, belonging to the technical field of optoelectronic device preparation of microwave optoelectronics field, particularly relating to an integrated optoelectronic device based on sideband injection locking and used for generating high-frequency microwaves. The integrated optoelectronic device integrates two slave lasers on the same substrate, sequentially extends a lower waveguide layer, a multi-quantum well active layer, a grating layer, an upper waveguide layer, an upper cladding layer and an Ohmic contact layer on the substrate, couples two slave lasers together by a Y branch waveguide or a multi-mode interferometer, thus realizing injection of modulation sideband of external main laser and carrying out injection locking; and heterodyne beat is conducted by the coupling output of the Y branch waveguide or the multi-mode interferometer, thus being capable of obtaining the high-frequency microwave. The integrated optoelectronic device can integrate a main laser and an electro-absorption modulator further and improve the integration further. The integrated optoelectronic device has novel structure, simple preparation process and excellent application prospect in the future field of high-speed communication.

The invention discloses a microwave photonic down-conversion apparatus and method based on a bidirectional cyclic frequency shift, and relates to the field of microwave photonics. The microwave photonic down-conversion apparatus and method aim to solve the defects of small bandwidth, large loss and the like confronted by a traditional electrical frequency converter and the defect that high-frequency electrical local oscillation is needed by an optical frequency conversion technology. The apparatus provided by the invention consists of a laser, a cyclic frequency shift module and a photoelectric detector; and the cyclic frequency shift module includes a 2*2 optical coupler, a polarization controller, a dual-drive electro-optical intensity modulator, an electrical local oscillation source, an optical amplifier, an optical band pass filter and an optical adjustable delay line. In the cyclic frequency shift module, first-order optical sidebands of a to-be-converted radio-frequency signal and an electrical local oscillation signal on an optical carrier simultaneously perform opposite optical sideband movement step by step at a same frequency shift, and at last photoelectric detection isperformed on two opposite frequency shift optical sidebands having nearest frequencies to implement down-conversion of the radio-frequency signal; and with the characteristic of opposite frequency shift of the cyclic frequency shift module, by changing a frequency of the electrical local oscillation source, the wide frequency range under low-frequency electrical local oscillation and the down-conversion of a tunable microwave signal are implemented.

The present invention discloses a double-chirp frequency multiplication signal generating device based on a dual parallel electro-optic modulator, and a method thereof, and relates to the field of microwave photonics and radars. In the device, the dual parallel electro-optic modulator consists of a phase modulator, and two intensity modulators respectively integrated in the upper and lower arms ofthe phase modulator; a continuous optical laser, a polarization controller, a dual parallel electro-optic modulator, and a photodetector are sequentially connected through the optical fiber, and theoptical detector is connected with a bandpass filter through RF cables; electrical signals are input to the two electro-optic intensity modulators respectively; and a double-chirp output electric signal with a multiple frequency and bandwidth is obtained from the output end of the bandpass filter. According to the technical scheme of the present invention, a single-chirp signal with a carrier frequency of C, a single-chirp signal with a bandwidth B and a microwave signal with a carrier frequency of 4C are used to generate a double-chirp signal with a carrier frequency of 2C and a bandwidth of2B; and the device can be used to generate a double-chirp pulse radar signal with a large bandwidth, has the advantages of a simple structure and easy integration, and can be used to effectively improve the range resolution of the radar system.

The invention relates to a radar communication countermeasure integration design based on microwave photonics. The radar communication countermeasure integration design comprises a system light source, an emitting and receiving end adjustable filtering module, an any waveform generating module, an emitting and receiving end modulator module, a light power amplifier module, a system time delay module, an emitting and receiving end end-detection module, a microwave antenna module, a passage receiving / direct collection receiving module, a microprocessor module and the like. The system can realize the function switching of three kinds of information systems of radar detection, digital communication and electronic countermeasure through parameter configuration and chip configuration; through the any waveform generating module, analog signals or digital signals used for three kinds of systems can be generated; the system comprises an emitting loop and a receiving loop; the emitting loop and the receiving loop use identical light sources, so that the system coherence is ensured; meanwhile, the microwave signals are processed in the photonic filed, so that the advantages of high bandwidth and low noise performance are realized. The system can realize the functional integration of the information system; the environment adaptability and reconfigurability of the system can be improved; the system can be widely used in the information technology fields such as ultra-wide band radar, digital communication and electronic countermeasure.

The invention discloses a radio-frequency signal stable-phase transmission method and belongs to the technical field of microwave photonics. A transmitting terminal divides the frequency of radio-frequency signals needing to be transmitted into two frequencies and then conducts photoelectric modulation, and modulated photo-signals are transmitted to a receiving terminal through a first fiber core of a multi-core optical fiber; the receiving terminal divides the received modulated photo-signals into two parts, wherein one part of the photo-signals are transmitted to the transmitting terminal through a second fiber core of the modulated multi-core optical fiber and then transmitted to the receiving terminal through a third fiber core of the multi-core optical fiber, demodulation is conducted on the part of modulated photo-signals, so that first radio-frequency signals are obtained, and demodulation and frequency tripling are conducted on the other part of the modulated photo-signals, so that second radio-frequency signals are obtained; frequency mixing is conducted on the first radio frequency signals and the second radio frequency signals, filtering is conducted on the frequency-mixed signals through a band-pass filter with the band-pass center frequency identical to that of the radio-frequency signals needing to be transmitted, and down-conversion signals with a stable phase are obtained finally. The invention further discloses a radio-frequency signal stable-phase transmission system. The radio-frequency signal stable-phase transmission system is lower in complexity and implementation cost and higher in compatibility.

The invention provides a system and method for generating multicarrier signals with high flatness and high sideband suppression ratios, and relates to the technical field of optics, microwave and microwave photonics. Multicarrier signals with the high flatness and the high sideband suppression ratios are generated in an optical frequency comb manner to solve the existing problem of multichannel microwave radio frequency signal generation problem within wide broad frequency coverage and acquire the multicarrier signal with a large bandwidth, good flatness and large carrier number. The invention provides an SSB-OCS generation method based on three MZMs connected in parallel, wherein two MZMs work in a single sideband modulation mode, and the other MZM works in an even order suppression mode so as to generate SSB-OCS signals with high sideband suppression ratios in combination with optical phase shift control of 90 degrees. Then, with the proposed SSB-OCS signal generation and optical frequency shift loop as a core, an oscillating circuit is formed in the optical domain to perform circular frequency shift so as to generate the multicarrier signals with high flatness and high sideband suppression ratios.

The invention discloses a light control microwave beam receiving system, and relates to microwave photonics technology. The system comprises N antenna units, wherein each antenna unit is connected with a first input end of a photomodulator; a second input end of the photomodulator is connected with a laser source, and an output end of the photomodulator is connected with an input end of an optical signal processing unit; the optical signal processing unit comprises N input ends and M output ends, and is used for realizing the combination and redistribution of optical signals; and the M output ends of the optical signal processing unit are respectively connected with light delayed units with different length, and the time-delay quantity generated by the light delayed units to the wavelength interval of laser output by adjacent laser light sources just compensates the time-delay quantity generated by the microwave signals on the adjacent antenna units due to source direction. The system disclosed by the invention has the advantages that the system structure is simple, high data rate and multi-user requirements are satisfied, and the mobile communication performance is improved.

The invention provides an instantaneous frequency measurement method and system with an adjustable measurement range based on a polarization modulator, and relates to the field of microwave photonics.In the system, TE and TM modes of light waves are subjected to constant-amplitude reverse-phase modulation through a light polarization modulator, and relative phase shift is introduced between the TE and TM modes through bias voltage; combining TE mode light waves and TM mode light waves through an optical power divider shunt and a polarizing film; further introducing equivalent dispersion intoupper and lower paths through a dispersion module formed by optical fibers; mapping the frequency information of a to-be-measured signal to phase information caused by dispersion, carrying out the photoelectric conversion through PD, transferring the frequency information to the amplitude of a photocurrent alternating current component, constructing an amplitude comparison function ACF through thealternating current component in a photocircuit, and calculating the frequency of the to-be-measured signal through the ACF function. The system is simple in structure, the measurement range of the system can be changed by adjusting the bias voltage and the polarization angle of the lower branch, and the measurement resolution of the system can be improved by optimizing the slope of the ACF.

The invention discloses a full-optical-wavelength conversion simplifying device and a full-optical-wavelength conversion simplifying method of a polarization multiplexing system without polarization crosstalk. A wavelength conversion structure of polarization diversity is adopted and two polarization beam splitters are used for respectively dividing signal light and pump light into two groups of mutually-orthorhombic polarization films; two baseband data signals are respectively modulated to two mutually-orthorhombic polarization modes of the signal light to form a modulating signal; the modulating signal and the pump light in the same polarization direction are coupled and then are respectively transmitted into two semiconductor optical amplifiers (SOA); and each SOA independently realizes the wavelength conversion in the same polarization direction. According to the full-optical-wavelength conversion simplifying device and the full-optical-wavelength conversion simplifying method, the crosstalk between polarization multiplexing channels, which is caused by the polarization dependence of a gain in polarization multiplexing wavelength conversion of one SOA, can be overcome; the performance of a wavelength conversion system is improved; the wavelength conversion device has a simple structure and the system is easily integrated; and the wavelength conversion device can be applied to a full-optical-wavelength conversion system of polarization multiplexing signals with the different modulating formats.

Disclosed is a microwave photonics based multi-channel signal transmission system for an aperture synthesis radiometer. The system comprises multi-channel receiving front ends, multi-channel optical transmitters, multi-channel optical fibers and optical receivers. The multi-channel receiving front ends receive multi-channel radio frequency microwave radiation signals through antennas, and then amplify the received signals through low-noise amplification modules. The multi-channel optical transmitters modulate the amplified radio frequency signals to light, light signals are transmitted from all the optical transmitters to the optical receivers through the multi-channel optical fibers, then the optical receivers convert the light signals into radio frequency signals to be outputted, and transmission of the multi-channel radio frequency signals of the aperture synthesis microwave radiometer is completed. By adoption of microwave photonics technology, the radio frequency signals of the distributed receiving front ends of the aperture synthesis microwave radiometer are transmitted, amplitude and phase congruency of multi-channel radio frequency transmission are improved greatly. The method is simple to implement and high in reliability, and a critical foundation is laid to future application of the aperture synthesis microwave radiometer.

The invention provides a microwave photon linear transmission method and system and belongs to the field of microwave photonics. Light carriers generated by a laser are input into a polarization multiplexing double-parallel Mach-Zehnder modulator (PM-DPMZM). Dual-tone radio frequency (RF) signals needing to be transmitted pass a 180-degree electric bridge, thereby obtaining two signals with equalpower and phase difference of Pi. The two signals output by the electric bridge are added to a DPMZM-1 and a DPMZM-2 in upper and lower arms of the PM-DPMZM. Through adjustment of six bias voltages inthe modulator, suppression of second-order and third-order nonlinear distortion is realized. Through adjustment of the bias voltages in the modulator, a system can be adjusted to achieve the second-order or third-order optimum suppression effect. Optical signals output by the modulator enter an erbium-doped fiber amplifier for power amplification, thereby compensating insertion losses in a link.The optical signals enter into a photoelectric detector for frequency beating, thereby obtaining signals transmitted by the system. According to the method, nonlinear distortion of a microwave photonlink is effective suppressed.

The present invention discloses a tunable single pass band microwave photonics Hilbert transform filter system that is based on broad spectrum light source polarization processing and combines with spectral notch phase shift and dispersion integral effect. The system comprises an amplification spontaneous emission broad spectrum light source, an optical fiber Bragg grating, a first polarization polarizer, a first polarization controller, a polarization beam splitter, an adjustable light delay line, an adjustable light attenuator, a phase shift optical fiber grating, a polarization beam combiner, a second polarization controller, a polarization modulator, a third polarization controller, a second polarization polarizer, a dispersion compensation module, and a high-speed photoelectric detector that are all connected with the amplification spontaneous emission broad spectrum light source. According to the system, random tuning of the spectrum position of the bandpass Hilbert transform is realized through turned light delay in a broad spectrum microwave band, so that the Hilbert transform of the bandpass microwave signal is realized. In addition, the system output has no base frequency response and no periodic spectral response, and ensures the singleness and immunity of channel selection.

A radiofrequency (rf) signal-processing device offers the possibility of high bandwidth operation. The disclosed device applies principles of microwave photonics and Linear Amplification based on Nonlinear Components (LINC). For some applications, the device may be embodied in an rf amplifier or rf transmitter. In an embodiment, an optical phase modulator is configured to receive an optical carrier signal as input, and further configured so that, when driven by an rf modulation signal, it will produce a complementary pair of optical signals as output. Each of a pair of detectors is configured to convert a respective one of the complementary optical signals to an rf signal. An rf combiner is configured to add the converted radiofrequency signals from the detectors to form an output signal.

The invention discloses a digital modulation signal source based on a microwave photon technology. In a digital modulation signal source composed of a mode locked laser 101, a luminous intensity modulator 102, a light polarization modulator 103, a tunable polarization correlation light comb filter 111, a tunable light band pass filter 108, a linearity dispersion medium 109 and a photoelectric detection unit 110, the tunable polarization correlation light comb filter 111 is formed by connecting a light circulator 104, a polarization beam splitter 105, programmable polarization mold dispersion units 106-1 and 106-2, and 45-degree Faraday rotators 107-1 and 107-2 in a specific mode, such that independent tunable comb filtering can be performed on mutually vertical linear polarization states, digital modulation signals with different modulation rates, different carrier wave frequencies, different modulation modes and different duty ratios are generated, and the digital modulation signal source can be applied to multiple important fields such as the transmitting end of a super-speed network, a radio-on-fiber system, a military radar and the like.

The invention belongs to the field of microwave photonics, and discloses a system and method for frequency tunable microwave phase shifting. The method comprises the following steps that after a continuous light carrier is splitted, one beam of the continuous light carrier is processed by a MZ Mach-zehnder, and double-sideband optical signals restrained by the carrier are produced; the other beam of the continuous light carrier is processed by a phase modulator, and phase-shifted light carrier signals are produced; two beams of light signals are combined in a wave mode, one one-step sideband is removed through a tunable micro-ring filter in a filtering mode, a frequency-moved carrier signal and a phase-shifted carrier signal are obtained, photovoltaic conversion is carried out through a photoelectric detector, and a phase shift microwave electrical signal is produced; the resonant frequency of the tunable micro-ring filter is equal to any one-step sideband of the two one-step sidebands output by the MZ Mach-zehnder by changing the frequency of an input voltage drive signal and the resonant wavelength of the tunable micro-ring filter, and the frequency of the phase shift microwave signal is changed. The system and method for the frequency tunable microwave phase shifting is stable in output performance, fast in phase shift adjusting response, small in output microwave range fluctuation and continuously adjustable in wide frequency range.

A microwave photonics-based wide-range high-precision microwave frequency measurement method and device, belonging to the technical field of microwave photonics. Tunable laser, coupler, phase modulator, intensity modulator 1, intensity modulator 2, filter, vector network analyzer, isolator, single-mode fiber 1, single-mode fiber 2, circulator 1, circulator 2 , Microwave signal source 1, microwave signal source 2, DC regulated power supply 1, DC regulated power supply 2, photoelectric converter. The amplitude-frequency characteristic curve and phase-frequency characteristic curve are measured by the vector network analyzer, so as to realize the rough measurement and precise measurement of the unknown signal frequency. The present invention uses two pump lights to realize the offset of the gain spectrum and the loss spectrum, and increase the multi-frequency measurement range; the present invention constructs a phase-shift-frequency function curve based on the Brillouin scattering phase-frequency characteristic, and obtains the measured phase-shift-frequency function curve through the phase-shift-frequency function curve The frequency value of the microwave signal improves the measurement accuracy.

The invention provides a remote high-frequency microwave oscillating source in an optical millimeter wave system. 90% of laser generated by a DFB (Distributed Feed Back) laser is input into a 40G modulator via a polarization controller, 10Gbit / s NRZ (Non Return to Zero) data is amplified by an SHF803P and then input into the 40G modulator, and data intensity modulation is implemented on the laser to generate high-speed broadband modulated light; the light is amplified by an erbium doped fiber amplifier, then input into an XTM50, and filtered to obtain a multiplex clock spectrum, and the spectrum is combined with 10% DFB laser to obtain a spectrum of the high-frequency microwave oscillating source; and the spectrum of the high-frequency microwave oscillating source is amplified via a KPS erbium doped fiber amplifier, input to a near dispersion flattened fiber set, and transmitted to a remote base station to form the high-frequency microwave oscillating source, and electrical signals after beat frequency can replace an electric local oscillator source in a millimeter wave uplink system. Backward Raman amplification is employed; and an AQ6319 and an E4440A respectively measure the spectral and electrographic characteristics of signals. The method for generating the remote high-frequency microwave oscillating source can be used as significant reference in researching the optical millimeter wave system in a high bit rate, and can be widely applied to the fields including microwave photonics and fiber communication.

The invention provides an optical frequency comb generation device with the comb tooth frequency interval capable of being scanned. A signal generator form two output ends through a microwave power distributor, wherein the first output end is connected with a photoelectric phase modulator after passing through a first broadband microwave power amplifier, the second output end is connected with a photoelectric intensity modulator after sequentially passing through an adjustable microwave delay line and a second broadband microwave power amplifier, a continuous wave laser carries out output sequentially through the photoelectric phase modulator and the photoelectric intensity modulator , the photoelectric phase modulator and the photoelectric intensity modulator are cascaded, and the photoelectric intensity modulator has direct-current bias. The invention further provides an optical frequency comb generation method. According to the optical frequency comb generation device and method, broadband continuous frequency scanning and accurate arbitrary adjustment of the comb tooth frequency interval are achieved, a generated optical frequency comb is stable in phase, frequency and central wavelength, and tunable, the device is simple in scheme, and low in cost, and the optical frequency comb generation device and method meet the requirement for application in the fields such as the optical measurement field, the laser radar field, the laser spectroscopy field, the optical fiber sensing field, the optical communication field and the microwave photonics field.

The invention discloses an optical device measurement method based on double sideband modulation, and belongs to the technical fields of optical device measurement and microwave photonics. First, the radio frequency signal is modulated on the first optical carrier signal by using the optical double sideband modulation method to generate a double sideband modulation signal; then the double sideband modulation signal is combined with the second optical carrier signal after passing through the optical device to be tested, and the second There is a frequency difference between the optical carrier signal and the first optical carrier signal; use a photodetector to beat the combined signal, and then extract the amplitude of the +1-order sideband signal and the -1-order sideband signal in the beat frequency signal Information; scanning the frequency of the radio frequency signal, that is, obtaining the wideband amplitude-frequency response of the optical device to be tested. The invention also discloses an optical device measurement device based on double sideband modulation. The invention greatly improves the measurement range and measurement efficiency while reducing the complexity and cost of the system, and more importantly, opens up a new direction for the optical device measurement technology.