CN103837742A - Microwave frequency-spectrum analyzer based on microwave photon processing - Google Patents
Microwave frequency-spectrum analyzer based on microwave photon processing Download PDFInfo
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- CN103837742A CN103837742A CN201210480073.6A CN201210480073A CN103837742A CN 103837742 A CN103837742 A CN 103837742A CN 201210480073 A CN201210480073 A CN 201210480073A CN 103837742 A CN103837742 A CN 103837742A
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Abstract
The invention provides a microwave frequency-spectrum analyzer based on microwave photon processing. The microwave frequency-spectrum analyzer converts a continuous-light-signal frequency-spectrum domain into a time domain through a photonic crystal so as to obtain a spectrogram of tested microwaves. In the microwave frequency-spectrum analyzer, a tested microwave signal is modulated to light waves via an electrooptical modulator and the light waves pass an optical-fiber collimator and a Fourier transform lens sequentially and are focused into a photonic crystal with an instantaneous spectral hole burning characteristic for spectral hole burning so that an absorption spectrum curve of the photonic crystal is identical with a spectrum curve of the modulated light; and at the same time, after another beam of light beam, the frequency of which is modulated periodically and linearly, passes a beam splitter, one beam is focused to a position of spectrum hole burning after passing the optical-fiber collimator and the Fourier transform lens and the transmission light of the beam is detected and output after being correlated with another beam of light of the beam splitter on a detector and output to a signal processor for processing together with the periodic linear signal after being converted by an acquisition card so that a frequency-spectrum distribution diagram of the tested microwaves is finally obtained.
Description
Technical field
The present invention relates generally to the Microwave Spectrum Analyser based on Microwave photonics processing, the photonic crystal that has an instantaneous spectrum hole burning by use is stored the spectrum of the light signal after being modulated by microwave, then obtains and process distributing to obtain tested microwave spectrum of this spectrum by reading light beam.
Background technology
Microwave photonics is one and specializes in interactional intercrossing subject between microwave and light signal, is usually applied in the fields such as BRAN, sensing network, radar, satellite communication, instrument measurement and national defense and military.Have transmission and the processing of the wide band electro-optical system of low-loss to microwave signal and have very strong attractive force, meanwhile, the development of high power capacity optical communication system needs microwave technology in optical transceiver.Zhe Liangge branch has facilitated the development of Microwave photonics research field.In recent years, the various application and researchs that microwave photon based on new learns a skill have obtained significant progress, mainly be divided into both direction, one is the research that works in the optical active devices of microwave and millimeter wave frequency, and another direction refers to technology and method generation, transmission, processing, measurement, control and the distribution microwave signal etc. of utilizing photonics.Compared to traditional electronics method, it is little that photonics method has volume, quality is light, be with roomy, the advantages such as the low and anti-electromagnetic interference (EMI) of loss, its key is the microwave signal receiving to be changed and be first modulated on light carrier by electric light, uses subsequently photonic signal processing device and optical fiber process accordingly and transmit in light territory, finally demodulates required microwave signal by opto-electronic conversion again.
Technology of spectral hole burning based on photonic crystal is a kind of mature technology that is widely used in wide-band-message field of storage.So-called spectral hole burning effect, in some photon crystal material, there is exactly such specific character: in the time that the single-frequency laser of a beam intensity passes through this crystal, it can be optionally by atomic excitation corresponding with resonant frequency a group to state of saturation, if at this moment have weak detection light of another bundle frequency sweeping by this medium, on its relevant position of absorption spectrum, will there is a depression.Storage that this feature of photon crystal material can be used for optical signal spectrum with read.
Microwave Spectrum Analyser is one of instrument the most basic, the most frequently used in microwave measuring instrument, being widely used in the various fields such as electronic countermeasure, Aero-Space, mobile communication, radio and television, research and production, is the indispensable equipment of dual-use Electronic Testing.Along with these application are more and more to higher frequency development, for solving the problem of frequency resource deficiency, its measurement range expands to microwave frequency band from RF band.In principle, Microwave Spectrum Analyser is generally divided into two types.One is fast Fourier transform analyzer, it is a kind of dynamic signal analyzer, signal is carried out to Fast Fourier Transform (FFT) to obtain frequency, amplitude and phase information within the special time cycle, can analytical cycle and nonperiodic signal, but its frequency spectrums of operation scope is subject to the restriction of the sampling rate of system to microwave signal, and cannot realize the analytic function that higher microwave signal is carried out to frequency spectrum.Another kind is microwave frequency sweep tuner-type analyser, and it is a kind of superhet or adjustable preliminary election receiver, can or convert by signal the intermediate-freuqncy signal of coming to signal and carry out real-time analysis, more than measurement range generally can reach 50GHz.In recent years, along with the indexs such as microwave measurement frequency range, sensitivity are improved constantly, superhet spectrum analyzer with it compared with high frequency resolution, measuring speed, relatively low cost and be used widely faster.
Frequency spectrograph belongs to Peak output product in surveying instrument, and exploitation drops into higher, and the medium and high-grade goods on market are all that external major company is all always.Most domestic spectrum analyzer performances are lower, are suitable for band limits narrow, can only occupy part low-end market.In the present invention, adopt based on Microwave photonics processing, by tested microwave signal is modulated to light wave, recycling has the processing of the photonic crystal of instantaneous spectrum hole burning, finally obtains the frequency spectrum profile of tested microwave signal.
Summary of the invention
The present invention proposes a kind of novel Microwave Spectrum Analyser based on Microwave photonics processing: there is the bandwidth of operation up to tens of GHz, but can extract with the photon detector of low bandwidth very the spectrum distribution of required tested microwave signal; By microwave is modulated on light wave, utilize the spectral hole burning effect of photonic crystal to carry out optical information processing, can greatly reduce the requirement of range measurement system to hardware computing power; Due to the very wide smooth spectral hole burning scope of having in some wavelength band of photonic crystal, and its spectral resolution can reach MHz magnitude, and therefore system of the present invention has very high operating frequency range and spectral resolution.
In the present invention: tested microwave signal is modulated on light wave through electrooptic modulator, this light wave passes through optical fiber collimator and Fourier transform lens successively, be focused onto on a photonic crystal with instantaneous spectrum hole burning characteristic, the light beam that enters photonic crystal carries out spectral hole burning to photonic crystal, makes the absorption spectra curve of photonic crystal consistent with the spectrum curve of described light modulated; Simultaneously, the light beam that another bundle frequency is modulated by periodic linear is by after beam splitter, wherein a branch of successively after optical fiber collimator and fourier lense, focus on the position that experiences spectral hole burning in photonic crystal, after the another light beam of its transmitted light and beam splitter is relevant on detector, be detected output, and be output to signal processor processes together with aforementioned periodic linear signal after capture card obtains, finally obtain the frequency spectrum profile of tested microwave.
The instantaneous spectrum hole burning memory technology that the present invention mainly adopts photonic crystal realizes the spectrum analysis function to tested microwave signal, specifically adopts following technical scheme:
Invention proposes the Microwave Spectrum Analyser based on Microwave photonics processing as shown in Figure 1, its basic thought is to utilize photonic crystal to carry out storing after spectral hole burning to the frequency spectrum of the light beam after tested microwave light modulation, then utilizing a branch of frequency sweeping to read light beam reads out with the form of time domain the modulated beam of light spectrum being stored in photonic crystal, and utilize heterodyne detection technology to be converted to electric signal, in the spectrum distribution of finally obtaining tested microwave signal through capture card collection and processing.The described Microwave Spectrum Analyser based on Microwave photonics processing is by high stable laser, electrooptic modulator, optical fiber collimator, fourier lense, constant thermal apparatus at low temperature, photonic crystal, light absorber, signal generator, driving circuit, tunable narrow linewidth laser, fiber optic splitter, Amici prism, condenser lens, photodetector, capture card, and signal processor composition.
In the present invention, system various piece is described as follows:
(1) described high stable laser produces the constant narrow linewidth continuous wave light signal of frequency, tested microwave signal is modulated described narrow linewidth continuous light signal by electrooptic modulator, in the modulated light signal that electrooptic modulator is exported, contains tested microwave signal spectrum distribution information;
(2) described photonic crystal has instantaneous even spectral hole burning characteristic in the spectral range of modulated light signal, modulated light signal is after optical fiber collimator and fourier lense, the photonic crystal being placed in constant thermal apparatus at low temperature is carried out to spectral hole burning processing, make the spectrum curve isomorphism of absorption spectra curve and the modulated light signal of photonic crystal;
(3) described signal generator, carries out frequency modulation (PFM) by driving circuit to tunable narrow linewidth laser after generation cycle sawtooth voltage, and the output beam frequency that makes tunable narrow linewidth laser is to change the linear phase in week;
(4) described fiber optic splitter, for the output beam of tunable narrow linewidth laser is divided into two bundles, wherein a branch of as surveying reference beam, another Shu Zuowei reads light beam after optical fiber collimator and fourier lense, be focused onto in photonic crystal, and due to the spectrum isomorphism of absorption spectra curve and the modulated light signal of photonic crystal, the frequency linearity that reads light beam that therefore ought enter photonic crystal changes, can read the modulated light signal of photonic crystal and carry out the absorption spectra curve after spectral hole burning, realize the spectral conversion of modulated light signal to time domain;
(5) described Amici prism, by described see through photonic crystal and by fourier lense read light beam with described detection reference beam closes, then pass through condenser lens, after being finally concerned with, be detected acquisition on photodetector;
(6) described signal processor, obtains photodetector output the data after capture card conversion, and the cycle sawtooth voltage of binding signal generator generation, analyzes the frequency spectrum profile that can obtain tested microwave signal.
(7) wavelength tuning range of described tunable narrow linewidth laser should comprise the wavelength coverage of modulated light signal, and the described luminous power that reads light beam is far smaller than the luminous power of modulated light signal.
(8) described light absorber is mainly used in the modulated light signal that sees through photonic crystal all to absorb, prevent that reflection side and scattered light from entering photonic crystal again, and constant thermal apparatus at low temperature in system is in keeping photonic crystal cryogenic thermostat, there is uniform optical transmission window, see through to make described modulated light signal and to read light beam.
Main characteristics of the present invention: use the Technology of spectral hole burning of photonic crystal, realize the storage of photonic crystal to tested microwave-modulated light signal spectrum and read technology, finally realize a kind of novel microwave spectrum analyzer of microwave signal spectrum measurement and analysis purpose.
Benefit of the present invention and application prospect: can be applicable to remote sensing, precision measurement, safety monitoring, the object of microwave signal spectrum analysis is realized in the fields such as BRAN, sensing network, radar, satellite communication, instrument measurement and national defense and military.
Brief description of the drawings
Fig. 1 is the Microwave Spectrum Analyser composition diagram that the present invention is based on Microwave photonics processing
Fig. 2 is photonic crystal signal storage and reads procedure chart.
Embodiment
As shown in Figure 1, transmitting terminal laser instrument 1 can adopt the Adjustik E15 continuous wave narrow cable and wide optical fiber laser of Koheras company, the light beam producing enters the electrooptic modulator 2 of the 40GHz phase type of Covega company, and tested microwave signal 3 modulates, the maximum frequency of tested microwave signal 3 is no more than the modulation band-width of electrooptic modulator 2.Light beam after the modulation that electrooptic modulator 2 is exported is after beam-expanding collimation device 4-1 and fourier lense 5-1, focusing enters the photonic crystal 7 being placed in constant thermal apparatus at low temperature 6, photonic crystal is produced to instantaneous spectrum hole burning, make the spectrum information of the light beam after modulation be stored in photonic crystal 7.Photonic crystal 7 is a kind of Tm
+ 3er
+ 3: YAG crystal, constant thermal apparatus at low temperature 6, for the PT-407 type cryogenic refrigerating unit that Cryomech company produces, can be realized minimum 4K cryogenic thermostat environment once.The light beam that light beam after modulation transmits in photonic crystal enters into light absorber 8, is absorbed to prevent reflection and scattering.
Photonic crystal 7 to modulation after light beam storage with read process as shown in Figure 2, Fig. 2 (a) ~ (d) represent successively absorption spectra curve of photonic crystal 7, enter the curve of spectrum of photonic crystal 7, the absorption spectra curve of photonic crystal 7 after spectral hole burning, detector output signal intensity curve.
Read the TLB-6328 type laser instrument that tunable narrow linewidth laser 11 used produces for NewFocus company, the sawtooth wave that this laser instrument is produced by a signal generator 9 carries out the linear modulation of frequency by driving circuit 10.The tunable narrow linewidth laser 11 output frequencies light beam that linear period changes in time enters in fiber optic splitter 12 and is divided into two-way.Wherein a road light signal focuses on the position that lives through spectral hole burning in photonic crystal 7 successively as reading light beam after collimation lens 4-2 and fourier lense 5-1.Read light beam at the transmitted light beam process fourier lense 5-2 through photonic crystal 7, another road light signal with fiber optic splitter 12 is exported, be coupled to together, and line focus lens 14 focuses on photodetector 15 by Amici prism 13.The output signal of photodetector 15 is passed through capture card 16 and signal processor 17 again, finally can obtain the spectrum distribution of tested microwave signal.
Claims (5)
1. the Microwave Spectrum Analyser based on microwave photon processing, comprising:
High stable laser (1), electrooptic modulator (2), optical fiber collimator (4), fourier lense (5), constant thermal apparatus at low temperature (6), photonic crystal (7), light absorber (8), signal generator (9), driving circuit (10), tunable narrow linewidth laser (11), fiber optic splitter (12), Amici prism (13), condenser lens (14), photodetector (15), capture card (16), signal processor (17);
The described Microwave Spectrum Analyser based on microwave photon processing, is characterized in that:
(a) described high stable laser produces the constant narrow linewidth continuous wave light signal of frequency, tested microwave signal is modulated described narrow linewidth continuous light signal by electrooptic modulator, in the modulated light signal that electrooptic modulator is exported, contains tested microwave signal spectrum distribution information;
(b) described photonic crystal has instantaneous even spectral hole burning characteristic in the spectral range of modulated light signal, modulated light signal is after optical fiber collimator and fourier lense, the photonic crystal being placed in constant thermal apparatus at low temperature is carried out to spectral hole burning processing, make the spectrum curve isomorphism of absorption spectra curve and the modulated light signal of photonic crystal;
(c) described signal generator, carries out frequency modulation (PFM) by driving circuit to tunable narrow linewidth laser after generation cycle sawtooth voltage, and the output beam frequency that makes tunable narrow linewidth laser is to change the linear phase in week;
(d) described fiber optic splitter, for the output beam of tunable narrow linewidth laser is divided into two bundles, wherein a branch of as surveying reference beam, another Shu Zuowei reads light beam after optical fiber collimator and fourier lense, be focused onto in photonic crystal, and due to the spectrum isomorphism of absorption spectra curve and the modulated light signal of photonic crystal, the frequency linearity that reads light beam that therefore ought enter photonic crystal changes, can read the modulated light signal of photonic crystal and carry out the absorption spectra curve after spectral hole burning, realize the spectral conversion of modulated light signal to time domain;
(e) described Amici prism, by described see through photonic crystal and by fourier lense read light beam with described detection reference beam closes, then pass through condenser lens, after being finally concerned with, be detected acquisition on photodetector;
(f) described signal processor, obtains photodetector output the data after capture card conversion, and the cycle sawtooth voltage of binding signal generator generation, analyzes the frequency spectrum profile that can obtain tested microwave signal.
2. the Microwave Spectrum Analyser based on microwave photon processing according to claim 1, the wavelength tuning range of described tunable narrow linewidth laser should comprise the wavelength coverage of modulated light signal.
3. the Microwave Spectrum Analyser based on microwave photon processing according to claim 1, the described luminous power that reads light beam is far smaller than the luminous power of modulated light signal.
4. the Microwave Spectrum Analyser based on microwave photon processing according to claim 1, described light absorber is mainly used in the modulated light signal that sees through photonic crystal all to absorb, and prevents that reflection side and scattered light from entering photonic crystal again.
5. the Microwave Spectrum Analyser based on microwave photon processing according to claim 1, described constant thermal apparatus at low temperature is in keeping photonic crystal cryogenic thermostat, there is uniform optical transmission window, see through to make described modulated light signal and to read light beam.
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| CN108918967A (en) * | 2018-06-26 | 2018-11-30 | 南京航空航天大学 | Based on microwave photon frequency multiplication and the frequency spectrum method of real-time and device that are mixed |
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| CN111638402A (en) * | 2020-05-21 | 2020-09-08 | 山西大学 | Method and system for measuring frequency of microwave signal in microwave electric field |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105811053A (en) * | 2016-04-25 | 2016-07-27 | 中国科学院理化技术研究所 | Broadband continuous tuning optical carrier microwave filtering device |
| CN105811053B (en) * | 2016-04-25 | 2018-12-14 | 中国科学院理化技术研究所 | A kind of broadband continuous tuning light load microwave filtering device |
| CN106253980A (en) * | 2016-09-14 | 2016-12-21 | 华中科技大学 | A kind of ultrafast radio spectrum measuring method and system |
| CN106253980B (en) * | 2016-09-14 | 2019-03-08 | 华中科技大学 | A kind of ultrafast radio spectrum measurement method and system |
| CN108918967A (en) * | 2018-06-26 | 2018-11-30 | 南京航空航天大学 | Based on microwave photon frequency multiplication and the frequency spectrum method of real-time and device that are mixed |
| CN110412436A (en) * | 2019-07-23 | 2019-11-05 | 大连世有电力科技有限公司 | Bushing shell for transformer dielectric loss frequency spectrum detection device based on photoelectric voltage measurement |
| CN111638402A (en) * | 2020-05-21 | 2020-09-08 | 山西大学 | Method and system for measuring frequency of microwave signal in microwave electric field |
| CN111638402B (en) * | 2020-05-21 | 2021-12-31 | 山西大学 | Method and system for measuring frequency of microwave signal in microwave electric field |
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| CN112398544A (en) * | 2020-11-05 | 2021-02-23 | 中国空间技术研究院 | Superheterodyne microwave photon receiving system and method |
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