CN103837742B - Based on the Microwave Spectrum Analyser of microwave photon process - Google Patents
Based on the Microwave Spectrum Analyser of microwave photon process Download PDFInfo
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- CN103837742B CN103837742B CN201210480073.6A CN201210480073A CN103837742B CN 103837742 B CN103837742 B CN 103837742B CN 201210480073 A CN201210480073 A CN 201210480073A CN 103837742 B CN103837742 B CN 103837742B
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Abstract
The present invention proposes a kind of Microwave Spectrum Analyser based on microwave photon process.Continuous light signal spectrum territory is converted to time domain mainly through photonic crystal by the present invention, to obtain tested Microwave Frequency spectrogram, in the present invention: tested microwave signal is modulated on light wave through electrooptic modulator, this light wave is successively through optical fiber collimator and Fourier transform lens, be focused onto one to have in the photonic crystal of instantaneous spectrum hole burning characteristic and carry out spectral hole burning to it, make 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, a branch of successively after optical fiber collimator and fourier lense, focus on by the position of spectral hole burning, output is detected after the another light beam of its transmitted light and beam splitter is relevant on the detector, and after capture card conversion, be output to signal processor processes together with preceding cycles linear signal, the final frequency spectrum profile obtaining tested microwave.
Description
Technical field
The present invention relates generally to the Microwave Spectrum Analyser based on Microwave photonics process, by the spectrum using the photonic crystal with instantaneous spectrum hole burning to store the light signal after being modulated by microwave, then obtain 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 the wide band electro-optical system of low-loss and have very strong attractive force to the transmission of microwave signal and process, meanwhile, the development of high power capacity optical communication system needs microwave technology in optical transceiver.This Liang Ge branch facilitates the development of Microwave photonics research field.In recent years, the various application and researchs learned a skill based on new microwave photon obtain significant progress, mainly be divided into both direction, one for working in the research of the optical active devices of microwave and millimeter wave frequency, another direction then refers to and utilizes the techniques and methods of photonics to produce, transmits, processes, measures, control and distribute microwave signal etc.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 electromagnetism interference of loss, its key is the microwave signal received first to be modulated on light carrier by electro-optic conversion, uses photonic signal processors and optical fiber process accordingly and transmit subsequently, finally demodulate required microwave signal by opto-electronic conversion again in area of light.
Technology of spectral hole burning based on photonic crystal is a kind of mature technology being widely used in wide-band-message field of storage.So-called spectral hole burning effect, so a kind of characteristic is there is exactly: when the single-frequency laser of a beam intensity is by this crystal in some photon crystal material, it can optionally by atomic excitation corresponding with resonant frequency for a group to state of saturation, if at this moment have another bundle frequency sweeping weak detection light by this medium, then on the relevant position of its absorption spectrum by appearance one depression.This feature of photon crystal material can be used for the storage of optical signal spectrum with reading.
Microwave Spectrum Analyser is one of basis, the most frequently used instrument the most 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, Fast Fourier Transform (FFT) is carried out to obtain frequency, amplitude and phase information to signal within the special time cycle, can analytical cycle and nonperiodic signal, but its frequency spectrums of operation scope is subject to the restriction of system to the sampling rate of microwave signal, and cannot realize the analytic function higher microwave signal being carried out to frequency spectrum.Another kind is microwave swept frequency tuner-type analyser, and it is a kind of superhet or adjustable preliminary election receiver, and can carry out real-time analysis to signal or the intermediate-freuqncy signal converted by signal, measurement range generally can reach more than 50GHz.In recent years, improve constantly along with to indexs such as microwave measurement frequency range, sensitivity, superhet spectrum analyzer is with its higher frequency resolution, faster measuring speed, relatively low cost and being used widely.
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 owns always.Most domestic spectrum analyzer performance is lower, is suitable for band limits narrow, can only occupies part low-end market.In the present invention, adopt based on Microwave photonics process, by tested microwave signal is modulated to light wave, recycling has the process of the photonic crystal of instantaneous spectrum hole burning, the final frequency spectrum profile obtaining tested microwave signal.
Summary of the invention
The present invention proposes a kind of novel Microwave Spectrum Analyser based on Microwave photonics process: there is the bandwidth of operation up to tens of GHz, but the spectrum distribution of required tested microwave signal can be extracted with the photon detector of very low bandwidth; By microwave is modulated on light wave, utilizes the spectral hole burning effect of photonic crystal to carry out optical information processing, greatly can reduce the requirement of range measurement system to hardware computing power; In some wavelength band, have very wide smooth spectral hole burning scope due to photonic crystal, and its spectral resolution can reach MHz magnitude, therefore present system 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 is successively through optical fiber collimator and Fourier transform lens, be focused onto on a photonic crystal with instantaneous spectrum hole burning characteristic, the light beam entering 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 in photonic crystal the position experiencing spectral hole burning, output is detected after the another light beam of its transmitted light and beam splitter is relevant on the detector, and after capture card obtains, be output to signal processor processes together with preceding cycles linear signal, the final frequency spectrum profile obtaining tested microwave.
The present invention mainly adopts the spectrum analysis function of instantaneous spectrum hole burning memory technology realization to tested microwave signal of photonic crystal, the following technical scheme of concrete employing:
Invention proposes the Microwave Spectrum Analyser based on Microwave photonics process as shown in Figure 1, its basic thought stores after utilizing the frequency spectrum of photonic crystal to the light beam after tested microwave light modulation to carry out spectral hole burning, then utilize a branch of frequency sweeping to read light beam to read out with the form of time domain the modulated beam of light spectrum stored in the photonic crystal, and utilize heterodyne detection technology to be converted to electric signal, the spectrum distribution of tested microwave signal is finally being obtained through capture card Acquire and process.The described Microwave Spectrum Analyser based on Microwave photonics process 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 instrument, 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) high stable laser described in produces the narrow linewidth continuous wave light signal of frequency-invariant, tested microwave signal is modulated described narrow linewidth continuous wave light signal by electrooptic modulator, containing tested microwave signal spectrum distribution information in the modulated light signal making electrooptic modulator export;
(2) photonic crystal described in 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, spectral hole burning process is carried out to the photonic crystal be placed in constant thermal apparatus at low temperature, makes the absorption spectra curve of photonic crystal and the spectrum curve isomorphism of modulated light signal;
(3) signal generator described in, carries out frequency modulation (PFM) by driving circuit to tunable narrow-linewidth laser instrument after producing cycle sawtooth voltage, makes the output beam frequency of tunable narrow-linewidth laser instrument be sawtooth period change;
(4) fiber optic splitter described in, for the output beam of tunable narrow-linewidth laser instrument is divided into two bundles, wherein a branch of as detection 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 absorption spectra curve of photonic crystal and the spectrum curve isomorphism of modulated light signal, therefore when the frequency linearity of the reading light beam entering photonic crystal changes, namely can read the modulated light signal of photonic crystal carry out spectral hole burning after absorption spectra curve, realize the spectral conversion of modulated light signal to time domain,
(5) Amici prism described in, optics coherence tomography light beam will be synthesized through the described reading light beam after photonic crystal and described detection reference beam through optical fiber collimator and fourier lense, then this optics coherence tomography light beam is through condenser lens, is detected acquisition after being finally concerned with on photodetector;
(6) signal processor described in, obtains photodetector and exports and data after capture card conversion, and the cycle sawtooth voltage that binding signal generator produces, and carries out analyzing obtaining the frequency spectrum profile of tested microwave signal.
(7) wavelength tuning range of the tunable narrow-linewidth laser instrument described in comprises the wavelength coverage of modulated light signal, and the luminous power of described reading light beam is far smaller than the luminous power of modulated light signal.
(8) light absorber described in is used for the modulated light signal through photonic crystal all to absorb, prevent reflected light and scattered light from again entering photonic crystal, and the constant thermal apparatus at low temperature in system is while maintenance photonic crystal cryogenic thermostat, there is uniform optical transmission window, with make described modulated light signal and read light beam through.
Main characteristics of the present invention: the Technology of spectral hole burning using photonic crystal, realizes photonic crystal to the storage of tested microwave-modulated light signal spectrum and reading 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 fields such as BRAN, sensing network, radar, satellite communication, instrument measurement and national defense and military realize the object of microwave signal spectrum analysis.
Accompanying drawing explanation
Fig. 1 is the Microwave Spectrum Analyser composition diagram that the present invention is based on Microwave photonics process
Fig. 2 is photonic crystal signal storage and reading procedure chart.
Embodiment
As shown in Figure 1, transmitting terminal laser instrument 1 can adopt the AdjustikE15 continuous wave narrow cable and wide optical fiber laser of Koheras company, the light beam produced enters the electrooptic modulator 2 of the 40GHz phase type of Covega company, and tested microwave signal 3 modulated, 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 exports is after beam-expanding collimation device 4-1 and fourier lense 5-1, focus on and enter the photonic crystal 7 be placed in constant thermal apparatus at low temperature 6, instantaneous spectrum hole burning is produced to photonic crystal, makes the spectrum information of the light beam after modulating be stored in photonic crystal 7.Photonic crystal 7 is a kind of Tm
+ 3er
+ 3: YAG crystal, the PT-407 type cryogenic refrigerating unit that constant thermal apparatus at low temperature 6 produces for Cryomech company, can realize minimum 4K cryogenic thermostat environment once.The light beam that light beam after modulation transmits in the 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) represents the absorption spectra curve of photonic crystal 7 successively, 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 instrument 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 instrument 11 output frequency linearly over time light beam of cyclomorphosis enters in fiber optic splitter 12 and is divided into two-way.Wherein a road light signal focuses on the position living 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 through photonic crystal 7 through fourier lense 5-2, another road light signal exported with fiber optic splitter 12, be coupled to together, and line focus lens 14 is focused on photodetector 15 by Amici prism 13.The output signal of photodetector 15, again through capture card 16 and signal processor 17, finally can obtain the spectrum distribution of tested microwave signal.
Claims (5)
1., based on a Microwave Spectrum Analyser for microwave photon process, 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 instrument (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 process, is characterized in that:
A the high stable laser described in () produces the narrow linewidth continuous wave light signal of frequency-invariant, tested microwave signal is modulated described narrow linewidth continuous wave light signal by electrooptic modulator, containing tested microwave signal spectrum distribution information in the modulated light signal making electrooptic modulator export;
B the photonic crystal described in () 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, spectral hole burning process is carried out to the photonic crystal be placed in constant thermal apparatus at low temperature, makes the absorption spectra curve of photonic crystal and the spectrum curve isomorphism of modulated light signal;
C the signal generator described in (), carries out frequency modulation (PFM) by driving circuit to tunable narrow-linewidth laser instrument after producing cycle sawtooth voltage, make the output beam frequency of tunable narrow-linewidth laser instrument be cycle sawtooth wave change;
Fiber optic splitter described in (d), for the output beam of tunable narrow-linewidth laser instrument is divided into two bundles, wherein a branch of as detection 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 absorption spectra curve of photonic crystal and the spectrum curve isomorphism of modulated light signal, therefore when the frequency linearity of the reading light beam entering photonic crystal changes, namely can read the modulated light signal of photonic crystal carry out spectral hole burning after absorption spectra curve, realize the spectral conversion of modulated light signal to time domain,
Amici prism described in (e), optics coherence tomography light beam will be synthesized through the described reading light beam after photonic crystal and described detection reference beam through optical fiber collimator and fourier lense, then this optics coherence tomography light beam is through condenser lens, is detected acquisition after being finally concerned with on photodetector;
F the signal processor described in (), obtains photodetector and exports and data after capture card conversion, and the cycle sawtooth voltage that binding signal generator produces, and carries out analyzing obtaining the frequency spectrum profile of tested microwave signal.
2. the Microwave Spectrum Analyser based on microwave photon process according to claim 1, the wavelength tuning range of described tunable narrow-linewidth laser instrument comprises the wavelength coverage of modulated light signal.
3. the Microwave Spectrum Analyser based on microwave photon process according to claim 1, the luminous power of described reading light beam is far smaller than the luminous power of modulated light signal.
4. the Microwave Spectrum Analyser based on microwave photon process according to claim 1, described light absorber is used for the modulated light signal through photonic crystal all to absorb, and prevents reflected light and scattered light from again entering photonic crystal.
5. the Microwave Spectrum Analyser based on microwave photon process according to claim 1, described constant thermal apparatus at low temperature is while maintenance photonic crystal cryogenic thermostat, there is uniform optical transmission window, with make described modulated light signal and read light beam through.
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| CN105811053B (en) * | 2016-04-25 | 2018-12-14 | 中国科学院理化技术研究所 | Broadband continuous tuning optical carrier microwave filtering device |
| CN106253980B (en) * | 2016-09-14 | 2019-03-08 | 华中科技大学 | A kind of ultrafast radio spectrum measurement method and system |
| CN108918967B (en) * | 2018-06-26 | 2019-09-06 | 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 |
| 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 |
| CN112398544B (en) * | 2020-11-05 | 2021-10-29 | 中国空间技术研究院 | Superheterodyne microwave photon receiving system and method |
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