CN101674132B - Multipoint high-frequency microwave signal generating method - Google Patents
Multipoint high-frequency microwave signal generating method Download PDFInfo
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- CN101674132B CN101674132B CN2009100358218A CN200910035821A CN101674132B CN 101674132 B CN101674132 B CN 101674132B CN 2009100358218 A CN2009100358218 A CN 2009100358218A CN 200910035821 A CN200910035821 A CN 200910035821A CN 101674132 B CN101674132 B CN 101674132B
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Abstract
The invention relates to a multipoint high-frequency microwave signal generating method; in the method, a 2*2 coupling, a Brillouin scattering device and a light filter are used for extracting pump signals and Stokes signals in one or multiple stages, and then the extracted signals are subject to beat frequency to generate one or a plurality of high-frequency microwave signals. The method comprises the following steps: firstly, designing an annular cavity structure based on Brillouin scattering, and arranging a Brillouin scattering device in the annular cavity so as to simultaneously obtain pump signals and Stokes signals in multiple stages; secondly, selecting two or a plurality of laser wavelengths the frequency interval of which is equal to that of the target microwave signal by using the light filter based on a preset reflectance spectrum, wherein all frequency components except for the selected laser wavelengths are inhibited; and thirdly, carrying out the beat frequency on the selected laser wavelengths to generate one or a plurality of microwave signals of which the frequencies are approximately integral multiples of 11GHz.
Description
Technical field
The present invention relates to a kind ofly utilize brillouin effect and annular chamber resonance structure for amplifying to produce multistage Stokes (Stokes) ripple and it is produced the method for high-frequency microwave signal through beat frequency behind the filter; It only needs a Brillouin scattering device just can produce multistage Stokes ripple, produces high-frequency microwave signal through photodetector.The frequency that this method produces microwave is high, frequency is many, 11GHz, and 22GHz, 33GHz ..., range up to 77GHz.Apparatus structure is simple, conversion efficiency is high, be easy to realization, has stronger practical value.
Background technology
Producing high-frequency microwave signal with method of optics is one of key technology in the light-carried wireless system (RoF).At present main photoproduction high-frequency microwave signal method mainly contain photoproduction high-frequency microwave signal method based on external modulator, based on the photoproduction high-frequency microwave signal method of various lasers heterodyne etc.
Based on the photoproduction high-frequency microwave signal method of external modulator, the microwave signal of generation is more stable, so but owing to need to adopt its cost of external modulator than higher.
Photoproduction high-frequency microwave signal method based on the laser heterodyne; Because the coherence from the two-beam of two various lasers is very poor, need to adopt comparatively complicated light phase phase-locked loop (OPLL), the influence that optical injection-locked ways such as (OIL) reduces phase noise usually.
And in the method by the bright people of grade of profound scholar proposition in patent of invention " utilizing optical fiber stimulated Brillouin scattering to produce the method and the device of high-frequency microwave signal " in 2008; The height of the frequency of the microwave signal that produces is closely related with the number of the stimulated Brillouin scattering device that is adopted; If it adopts a stimulated Brillouin scattering device; Then can only produce the microwave signal that frequency is about 11GHz; The microwave signal that produces higher frequency must increase the number of stimulated Brillouin scattering device, the complexity that this has not only increased the realization cost of system but also has improved system.
People such as Park propose utilizes Brillouin scattering, Brillouin to refill and method that Brillouin selects to amplify realizes the method for frequency frequency multiplication; Not only used microwave signal source as the drive source of modulator but also adopted two dish monomode fibers in this method as the Brillouin scattering device; And it can only realize the frequency tripling of microwave signal frequency, and shg efficiency is relatively low.
Therefore, under the prerequisite that does not increase system cost, designing the variable high-frequency microwave signal generating means of microwave signal frequency of a kind of simple structure and generation, is the consideration from cost on the one hand.The light-carried wireless system is as an access network technology, and cost is the factor that must consider.Owing to relate to the problem of frequency up-converted and down conversion, in central office or base station, Millimeter-Wave Source must be arranged, and the Millimeter-Wave Source price is very expensive.On the other hand, millimeter wave is relatively more difficult in the processing in electric territory, faces the electronic bottleneck that can't break through.And use the photoproduction millimeter wave, and not only having the low advantage of phase noise, and because the loss of optical fiber is very little, signal can long-distance transmissions, is convenient to be assigned to far-end and is launched by antenna.
Summary of the invention
Technical problem: the purpose of this invention is to provide a kind of multipoint high-frequency microwave signal generating method, improve the frequency range and the power conversion efficiency that produce microwave signal based on stimulated Brillouin scattering.System constitutes simple, and cost is low, and stability is high, has stronger practical value.
Technical scheme: multipoint high-frequency microwave signal generating method of the present invention may further comprise the steps:
1), based on the sharp deep scattering effect of the cloth dorsad of monomode fiber; It is the stokes light of 0.088nm that the sharp deep scattering effect of cloth produces with respect to the pump light frequency displacement; Based on belt resonant cavity structure for amplifying, make input signal repeatedly get into the Brillouin scattering device, produce multistage stokes light;
2), based on the optical filter of predetermined reflectance spectrum, select 2 or several optical maser wavelength that frequency interval equals the frequency of target microwave signal, and all frequency components are suppressed all except that the optical maser wavelength that is selected;
3), the optical maser wavelength that is selected is carried out beat frequency, produce frequency and be about integral multiple in the some of 11GHz or certain several microwave signal.
Described microwave signal is:
1), when needs produce the microwave signal of single-frequency, design bimodal filter, make the peak-peak of its reflectance spectrum be about the integral multiple of 11GHz or 11GHz at interval;
2), when needs produce the multiple spot microwave signal simultaneously, design the multimodal filter, make the peak-peak of its reflectance spectrum be about the integral multiple of 11GHz or 11GHz at interval.
Beneficial effect: adopting the ring cavity structure to produce multistage Stokes signal only needs a directional coupler, three port circulators and a Brillouin scattering device, has very competitive advantages such as device is few, cost is low.
What extract when effectively solving pump signal and certain one-level or certain Stokes signal; The optical filter of characteristics such as utilization has that rejection ratio height, roll-off characteristic are good, width, Insertion Loss are low, stable height; The pump signal that can be simultaneously peak wavelength be about the 0.088nm integral multiple is at interval come out with certain one-level or certain what Stokes signal extraction; Remaining Stokes signal is then played the effect of filtering, and then produce the higher microwave signal of purity.
Conventional method only can produce the corresponding 11GHz microwave signal of 1 grade of Stokes light, produces high-frequency microwave and must carry out Order Scattering, then needs a plurality of image intensifers.The present invention adopts annular chamber resonance structure for amplifying, only needs 1 image intensifer just can produce a plurality of high-frequency microwave signals.
Description of drawings
Fig. 1 is the scheme that produces multipoint high-frequency microwave signal,
Fig. 2 is the experiment block diagram that produces high-frequency microwave signal,
Fig. 3 is the pump signal of actual measurement and the spectral line of multistage Stokes signal,
Fig. 4 is the reflectance spectrum that bimodal filter obtains with the wide spectrum light source actual measurement,
Fig. 5 is pump signal and three grades of Stokes signals of gained behind filter filtering,
Fig. 6 is the reflectance spectrum sketch map that the wavelength interval is respectively the 3 peak optical filters of 0.176nm,
Fig. 7 is the reflectance spectrum sketch map that the wavelength interval is respectively 3 peak optical filters of 0.176nm and 0.264.
Have among the above figure: narrow linewidth laser 1,2x2 optical coupler 2, erbium-doped fiber amplifier 3 (EDFA), Brillouin scattering device 4, optical filter 5, photodetector 6, electric spectrum analyzer 7.
Embodiment
1). based on the sharp deep scattering effect of the cloth dorsad of monomode fiber; It is the stokes light of 0.088nm that the sharp deep scattering effect of cloth produces with respect to the pump light frequency displacement; Based on belt resonant cavity structure for amplifying, make input signal repeatedly get into the Brillouin scattering device, produce multistage stokes light;
2). based on predetermined wavelength bimodal optical filter at interval; Obtain 2 optical maser wavelengths (all frequency components except these two optical maser wavelengths all are suppressed) that frequency interval equals the frequency of target microwave signal; These 2 optical maser wavelengths are carried out beat frequency, produce frequency and be about the microwave signal of integral multiple in 11GHz;
3). the multimodal filter that designs at interval based on predetermined wavelength; Per two peak-to-peak intervals of this multimodal filter all are about the integral multiple of 11GHz or 11GHz; Utilize this multimodal filter from pump light and multistage stokes light, to select certain several optical maser wavelength, these optical maser wavelengths that are selected are carried out the microwave signal that beat frequency just can produce a plurality of frequencies simultaneously.
Multipoint high-frequency microwave signal generating method implementation based on optical fiber stimulated Brillouin scattering and annular chamber resonance structure for amplifying of the present invention is as shown in Figure 1, and 1 is narrow linewidth laser among the figure, the stability of its live width and the stability decision microwave signal that produces; 2 is the 2x2 optical coupler, and coupling ratio is confirmed according to required power output and conversion efficiency; 3 is erbium-doped fiber amplifier (EDFA), and its signal power of going into to inject the Brillouin scattering device in order to assurance can reach the excited Brillouin threshold value, thereby guarantees the generation of stimulated Brillouin scattering effect; 4 are the Brillouin scattering device, and common looping resonant cavity makes the power in the chamber be enough to produce multistage Stokes flashlight through the resonance amplification; 5 is optical filter, is used for extracting two or more signals from pumping wave and multistage Stokes signal and carries out beat frequency; 6 is photodetector, in order to carry out beat frequency, to produce microwave signal; 7 is electric spectrum analyzer, in order to the microwave signal of gained behind the observation beat frequency.
This scheme mainly is divided into two steps:
1) flashlight that the narrow linewidth light source is sent is divided into two paths of signals through 2 * 2 couplers; One the tunnel is used for through amplifying through sending into EDFA once more after inserting a stimulated Brillouin scattering device generation Stokes signal coupler after the EDFA amplification; Thereby constitute an annular chamber, can observe multistage Stokes signal from another roads of 2 * 2 coupler output ports.
2) filter select for use be easy to design and produce, superstructure fiber grating filter stable and reliable for performance.
The superstructure fiber grating filter is through design; Produce the consistent bimodal or multi-peaks structure in wavelength interval that satisfies pumping wave and certain one-level or certain what Stokes signal with peak-peak at interval; Be more suitable for carrying out beat frequency with certain one-level or certain what Stokes signal, be about some microwave signal or the many high-frequency microwave signal of integral multiple in 11GHz thereby obtain frequency in from pumping wave and multistage Stokes ripple, selecting pump signal.
Shown in Figure 2 is the experiment block diagram that produces multistage brillouin scattering signal, and it is the instance of Fig. 1.Brillouin scattering device 4 among the figure is that the optical fiber 10 of 20km is formed by optical circulator 9 and a dish length, and 8 is spectrometer.Among the figure; We with tunable laser as exciting light source; The light signal of its outgoing is divided into two-way behind 2 * 2 couplers, wherein one road light signal is sent into the input a end that the merit proportion by subtraction is 2 ' 2 coupler as driving source, and the d port of this coupler connects the input of erbium-doped fiber amplifier luminous power is amplified to guarantee that it reaches the excited Brillouin threshold value of optical fiber; And after behind the circulator light signal is sent into optical fiber; Thereby the generation stimulated Brillouin scattering, this moment, the light signal from circulator c mouth output comprised light carrier and two signal components of one-level Brillouin scattering, the c port during another input that this light signal is sent into coupler is promptly schemed; So far just constituted a ring cavity; The light signal of analysis in can proper ring cavity when circulator c port is exported, wherein comprised three components for the second time, is light carrier, one-level Brillouin scattering and secondary Brillouin scattering.By that analogy,, light signal can obtain multistage Stokes signal when repeatedly passing through ring cavity.
According to above scheme; The centre wavelength of our tuned laser is 1547.337nm, go out luminous power is 6dBm; Then this light signal being sent into splitting ratio is the port a during an input of 90%: 10% 2 ' 2 couplers is promptly schemed; The d port of coupler connects the input of gain for the erbium-doped fiber amplifier of 17dBm, luminous power is amplified a mouth of the light signal input circulator that comes out from amplifier; The b mouth of circulator connects the general single mode fiber of a dish 20km, and another input of sending into coupler from the light signal of circulator c mouth output is port c.According to above experiment; Use model to observe as the spectroanalysis instrument of 50pm from coupler b port as MS9710C, resolution; Obtain the spectrum that contains optical carrier and multistage Stokes light signal as shown in Figure 3, can clearly observe one to seven grade of Stokes light signal among the figure.
Adopt restructural-equivalent chirp (REC) technology then, and, confirm the index of the bimodal filter of superstructure fiber grating: the central wavelength lambda=1551.682nm of filter, bimodal spacing d=0.248nm according to the characteristics of Brillouin's signal.Produce superstructure fiber grating filter shown in Figure 4, this curve is its reflection spectral line that utilizes wide spectrum light source to record.
On the basis that successfully makes bimodal filter; It is 1551.682nm that the adjusting tunable laser makes centre wavelength of its output signal; So that the left peak of bimodal filter reflectance spectrum and pump signal are just coincide; The right peak of then bimodal filter reflectance spectrum just coincide with three grades of Stokes signals, thereby selects pump signal and three grades of Stokes signals carry out beat frequency, can obtain the microwave signal that frequency is about 33GHz.
The manufacture method of the bimodal filter that adopts; Simple to operate, cost is lower and be easy to make; Except designing the bimodal filter that reflectance spectrum peak-peak as shown in Figure 4 is spaced apart 0.264nm; We can produce the bimodal filter that peak-peak is about 0.088nm, 0.176nm, 0.352nm, 0.440nm, 0.528nm, 0.616nm at interval equally; If carry out filtering with above these filters, frequency is that the microwave signal of 11GHz, 22GHz, 44GHz, 55GHz, 66GHz, 77GHz can obtain so.In addition, this method can be used to make the multimodal filter equally, but multimodal filter flexible design is takeed the example of two three peak filters below and explained.(a) adopt the wavelength interval to be respectively the 3 peak optical filters of 0.176nm, obtaining frequency interval is 3 optical maser wavelengths of 22GHz and 44GHz, produces the microwave signal of beat frequency 22GHz and 44GHz simultaneously, and the reflectance spectrum characteristic of filter is shown in red dotted line among Fig. 6; (b) adopt the wavelength interval to be respectively 3 peak optical filters of 0.176nm and 0.264; Obtaining frequency interval is 3 optical maser wavelengths of 22GHz and 33GHz; Produce the microwave signal of beat frequency 22GHz, 33GHz and 55GHz simultaneously, the reflectance spectrum characteristic of filter is shown in red dotted line among Fig. 7.
Claims (2)
1. multipoint high-frequency microwave signal generating method is characterized in that this method may further comprise the steps:
1), based on the sharp deep scattering effect of the cloth dorsad of monomode fiber; The sharp deep scattering effect generation of cloth is the stokes light of 0.088nm with respect to the pump light frequency displacement dorsad; Based on belt resonant cavity structure for amplifying, make input signal repeatedly get into the Brillouin scattering device, produce multistage stokes light;
2), based on the optical filter of predetermined reflectance spectrum, select several optical maser wavelengths that frequency interval equals the frequency of target microwave signal, and all frequency components are suppressed all except that the optical maser wavelength that is selected;
3), the optical maser wavelength that is selected is carried out beat frequency, produce frequency and be about integral multiple certain several microwave signal in 11GHz.
2. multipoint high-frequency microwave signal generating method according to claim 1 is characterized in that described filter is:
1), when needs produce the microwave signal of single-frequency, design bimodal filter, make the peak-peak of its reflectance spectrum be about the integral multiple of 11GHz or 11GHz at interval;
2), when needs produce the multiple spot microwave signal simultaneously, design the multimodal filter, make the peak-peak of its reflectance spectrum be about the integral multiple of 11GHz or 11GHz at interval.
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| CN102545042B (en) * | 2012-02-21 | 2013-04-03 | 山西大同大学 | Production method of optical microwave signal with tunable broadband frequency |
| CN103516430A (en) * | 2013-10-08 | 2014-01-15 | 中国人民解放军理工大学 | Tuning dispersion compensation method used for linear optical fiber system |
| CN107765086B (en) * | 2017-10-17 | 2023-07-07 | 闽南师范大学 | Device for simultaneously measuring frequencies of multiple microwave signals |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101222121A (en) * | 2007-12-13 | 2008-07-16 | 清华大学 | Integrated opto-electronic device for generating high-frequency microwave by SOA four-wave mixing effect |
| CN101222118A (en) * | 2007-12-10 | 2008-07-16 | 清华大学 | Integrated opto-electronic device for generating high-frequency microwave by light heterodyne method |
| CN101286802A (en) * | 2008-05-20 | 2008-10-15 | 浙江大学 | Method and device for generating high-frequency microwave signal |
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| CN101222118A (en) * | 2007-12-10 | 2008-07-16 | 清华大学 | Integrated opto-electronic device for generating high-frequency microwave by light heterodyne method |
| CN101222121A (en) * | 2007-12-13 | 2008-07-16 | 清华大学 | Integrated opto-electronic device for generating high-frequency microwave by SOA four-wave mixing effect |
| CN101286802A (en) * | 2008-05-20 | 2008-10-15 | 浙江大学 | Method and device for generating high-frequency microwave signal |
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