CN103684610B - A kind of remote high-frequency microwave generating source in optical millimeter wave system - Google Patents
A kind of remote high-frequency microwave generating source in optical millimeter wave system Download PDFInfo
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- CN103684610B CN103684610B CN201310447350.8A CN201310447350A CN103684610B CN 103684610 B CN103684610 B CN 103684610B CN 201310447350 A CN201310447350 A CN 201310447350A CN 103684610 B CN103684610 B CN 103684610B
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Abstract
The present invention proposes a kind of remote high-frequency microwave generating source in optical millimeter wave system. Does DFB laser along separate routes 90% part enter 40G modulator, 10Gbit/s through Polarization Controller? NRZ data are amplified into 40G modulator via SHF803P, and laser is produced two-forty wide-band modulation light by intensity data modulation; This light is amplified into XTM50 filtering through erbium-doped fiber amplifier and obtains many times of clock spectrum, and this spectrum and 10% DFB laser close rood to high-frequency microwave oscillation source spectrum; Spectrum after KPS erbium-doped fiber amplifier amplifies enters nearly Dispersion Flattened Fiber group transmission and arrives remote base stations formation remote high-frequency microwave generating source, the electric local vibration source in the alternative optical millimeter wave up-link of the signal of telecommunication forming after beat frequency; Adopt backward Raman to amplify; AQ6319, E4440A be measuring-signal spectrum, electric spectral property respectively; This method can be used as the important references of research high bit rate optical millimeter wave system, can be applicable to the field such as Microwave photonics, fiber optic communication.
Description
Affiliated technical field
The present invention relates to a kind of remote high-frequency microwave generating source in optical millimeter wave system, can be applicable to Microwave photonics, optical fiber logicalThe fields such as letter, wireless optical fiber access.
Background technology
In recent years, the miscellaneous services such as large data, mobile traffic, broadband streaming media constantly increase severely, High rate and large capacity radio communicationDemand increases day by day. In order to realize wireless broadband communication, must improve its operating frequency. But, at present both domestic and external mostNumber wireless traffic all concentrates on below 3GHz, and existing low-frequency range frequency resource is nearly all occupied, for 3GHzThe less commercial system that is applied to above frequency resource (as 40GHz, 60GHz), is applied to experimental study mostly. IfCan make full use of this frequency range window business telecommunication, not only can make full use of existing frequency spectrum resource, but also can realize ultra broadbandWireless access. But, along with the raising of wireless broadband communication operating frequency, the complicated geographical environments such as high-rise, high mountainTo in electromagnetic reflection and shielding action and atmosphere because absorb and the loss that causes of reflection etc. increases gradually, and make wirelessIt is complicated that the networking of broadband network becomes. For addressing the above problem, the light that Fibre Optical Communication Technology and high frequency wireless access are mergedMillimetre-wave attenuator technology Radio-over-Fiber (RoF) should need and give birth to. At present, optical millimeter wave generation, transmission and reception technique are doneFor a kind of emerging communication technology growing up has become the study hotspot of realizing ultra broadband access.
Generation, transmission and the reception technique of optical millimeter wave is the important technology of realizing high performance communication. But optical millimeter wave is upIn subsystem, conventionally all have to introduce an expensive electric high-frequency local oscillation source (as 40GHz, 60GHz), if can take effectivelyMeasure substitutes electric high-frequency local oscillation source and will be the progress that this system is very large. In view of optical millimeter wave system is to device performance parameter, optical fiber ginsengAmount waits and requires harshly, and optical millimeter wave produces in experimental technique at present, mostly adopts data compared with low rate situation, as 5Gbit/s andBelow. But China is vast in territory, populous, information communication demand rapid growth, the communication of high rate optical millimeter wave needsChanges persuing obtains day by day urgent. As can be seen here, solving innovatively the substitution problem in electric high-frequency local oscillation source and realize two-forty is light millimeterThe key point of ripple research.
Summary of the invention
In the day by day urgent situation of optical millimeter wave two-forty demand, for the problem in above-mentioned optical millimeter wave research, 40GHz,In 10Gbit/s high rate optical millimeter-wave systems, the present invention proposes a kind of remote high-frequency microwave generating source, to substitute high rate opticalElectric high-frequency local oscillation source in millimeter wave up-link.
The technical solution adopted for the present invention to solve the technical problems is:
For 40GHz, 10Gbit/s high rate optical millimeter-wave systems, the present invention proposes a kind of remote high-frequency microwave oscillation source sideMethod and device, intend the technical scheme adopting: the laser that narrow linewidth Distributed Feedback Laser produces through 10: 90 shunts along separate routes after, itsIn 90% laser enter 40G high-speed wideband modulator through optical polarization controller, Agilent 43Gbit/s Error Detector 81250 is exported10Gbit/s two-forty NRZ pseudo-random pulse data sequence signal via broadband electric amplifier SHF803P amplify after enter simultaneouslyEnter 40G high-speed wideband modulator, narrow-linewidth laser is produced two-forty wide-band modulation light, the height producing here by intensity data modulationRate broadband light modulated can produce optical millimeter wave and microwave generating source as the part of descending optical millimeter wave signal along separate routes simultaneously, butHere only discuss the microwave generating source situation that produces; Two-forty wide-band modulation light amplifies laggard through 17dBm erbium-doped fiber amplifierEnter optical filter XTM50, after filtering, obtain many times of clock spectrum of 40GHz, this clock spectrum and shunt separate 10%Laser spectrum obtains high-frequency microwave oscillation source signal spectrum after 1: 99 combiner closes road, and wherein clock spectrum is entered by 99% portCombiner; High-frequency microwave oscillation source signal spectrum after KPS erbium-doped fiber amplifier amplifies enters nearly Dispersion Flattened Fiber group and passesDefeated 84.7km arrives remote base stations and form remote high-frequency microwave generating source, the alternative height of the signal of telecommunication forming after remote base stations beat frequencyElectric high-frequency local oscillation source in speed optical millimeter wave up-link; In order to ensure signal transmission quality, the pumping that raman pump source producesLight enters optical fiber group through wavelength division multiplexer high-frequency microwave oscillation source signal is carried out to backward Raman amplification; Afterwards, remote high-frequency microwaveOscillation source signal enters 70GHz photodetector beat frequency, and through broadband, electric amplifier SHF806E is amplified into frequency mixer 11970UCarry out mixing, finally by electric spectrometer E4440A Measurement and analysis signal electricity spectrality energy; Wherein, KPS erbium-doped fiber amplifier andLight path link can be used spectroanalysis instrument AQ6319 to measure the spectrum property of signal.
The invention has the beneficial effects as follows:
In 40GHz, 10Gbit/s high rate optical millimeter-wave systems, the present invention proposes a kind of remote high-frequency microwave generating source;Adopt same DFB LASER Light Source to produce high rate optical millimeter wave and remote high-frequency microwave generating source, can effectively suppress phase place and make an uproarSound; The DFB laser adopting has narrow linewidth, high side mode suppression ratio characteristic, effectively inhibition strength noise; Adopt Error DetectorThe 10Gbit/s high data rate of 81250 outputs goes intensity modulated DFB narrow-linewidth laser can improve number by a wideband modulatorAccording to speed. With adopt radio frequency and baseband signal respectively phase modulation and intensity two kinds produce optical millimeter wave methods and compare, the present inventionCan produce high rate optical millimeter wave and remote high-frequency microwave generating source, optical millimeter wave system medium-long range high-frequency microwave oscillation source simultaneouslyGeneration scheme novelty, simple possible, can effectively suppress noise. This patent method and apparatus can be used as exploratory development high bit rate lightThe important references of millimeter-wave systems, can be applicable to the field such as Microwave photonics, fiber optic communication.
Brief description of the drawings
Fig. 1 is that a kind of remote high-frequency microwave generating source in 40GHz, 10Gbit/s high rate optical millimeter-wave systems produces and measuresFigure. In Fig. 1, the 1st, narrow linewidth Distributed Feedback Laser, 2 is 10: 90 shunts, the 3rd, optical polarization controller, the 4th, 40G is highSpeed wideband modulator, the 5th, Agilent 43Gbit/s Error Detector 81250,6th, broadband electric amplifier SHF803P, the 7th, 17dBmErbium-doped fiber amplifier, the 8th, optical filter XTM50,9 is 1: 99 combiner, the 10th, KPS erbium-doped fiber amplifier, 11Nearly Dispersion Flattened Fiber group (first G655 optical fiber, then connect Dispersion Flattened Fiber), the 12nd, raman pump source, the 13rd, wavelength-division is multipleWith device, the 14th, 70GHz photodetector, the 15th, broadband electric amplifier SHF806E, the 16th, frequency mixer 11970U, the 17th,Electricity spectrometer E4440A, the 18th, spectroanalysis instrument AQ6319; Electricity spectrometer E4440A measuring-signal electricity spectrality energy; Spectroanalysis instrumentAQ6319 measures the spectrum property of signal, can adopt optical patchcord directly to access.
Fig. 2 is the high-frequency microwave oscillation source spectrum after KPS erbium-doped fiber amplifier amplifies.
Fig. 3 be KPS erbium-doped fiber amplifier amplify after high-frequency microwave oscillation source spectrum through the nearly Dispersion Flattened Fiber group of 84.7kmSpectrum after transmission is amplified with Raman.
Fig. 4 is the high-frequency microwave oscillation source electricity spectrum corresponding with Fig. 2 spectrum.
Fig. 5 is the high-frequency microwave oscillation source electricity spectrum corresponding with Fig. 3 spectrum.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described with enforcement.
Shown in Fig. 1, the laser that narrow linewidth Distributed Feedback Laser (1) produces through 10: 90 shunt (2) along separate routes after, wherein 90%Laser enter 40G high-speed wideband modulator (4), Agilent 43Gbit/s Error Detector 81250 through optical polarization controller (3)(5) the 10Gbit/s two-forty NRZ pseudo-random pulse data sequence signal of output is via broadband electric amplifier SHF803P (6)After amplification, enter 40G high-speed wideband modulator (4), narrow-linewidth laser is produced two-forty wide-band modulation by intensity data modulation simultaneouslyLight, the two-forty wide-band modulation light producing here can produce optical millimeter wave as the part of descending optical millimeter wave signal along separate routes simultaneouslyWith microwave generating source, but only discuss the microwave generating source situation that produces here; Two-forty wide-band modulation light is through 17dBm er-doped lightFiber amplifier (7) is amplified into optical filter XTM50 (8), obtains many times of clock spectrum of 40GHz, this clock after filtering10% the laser spectrum that spectrum and shunt separate through 1: 99 combiner (9) obtain high-frequency microwave oscillation source flashlight after closing roadSpectrum, wherein clock spectrum enters combiner by 99% port; This high-frequency microwave oscillation source signal bandwidth 40GHz, data rate 10Gbit/s; High-frequency microwave oscillation source signal spectrum after KPS erbium-doped fiber amplifier (10) amplifies enters nearly dispersion flattene lightFine group (11) transmission 84.7km arrives remote base stations and forms remote high-frequency microwave generating source; After remote high-frequency microwave generating source beat frequencyElectric high-frequency local oscillation source in the alternative high rate optical millimeter wave of the signal of telecommunication up-link forming; In order to ensure signal transmission quality,The pump light that raman pump source (12) produces enters optical fiber group through wavelength division multiplexer (13) to carry out high-frequency microwave oscillation source signalBackward Raman amplifies; After Raman amplifies, remote high-frequency microwave oscillation source signal enters 70GHz photodetector (14) beat frequency,Be amplified into frequency mixer 11970U (16) through broadband electric amplifier SHF806E (15) and carry out mixing, after by electric spectrometer E4440A(17) Measurement and analysis signal electricity spectrality energy; Wherein, KPS erbium-doped fiber amplifier and light path link thereof can directly adopt optical fiber to jumpLine connects spectroanalysis instrument AQ6319 (18) spectrum property of signal is measured.
Fig. 2 is the high-frequency microwave oscillation source spectrum after KPS erbium-doped fiber amplifier amplifies. The light wave of these two wavelength is by sameLaser instrument produces, and can effectively suppress phase noise; The clock spectrum centre wavelength 1949.608nm visible in figure, filtering obtains, timeClock is composed up to 29dB, and spectral line is more smooth, has good symmetry about clock spectrum center. Narrow linewidth Distributed Feedback Laser producesSpectrum after laser shunt still keeps primary characteristic, than the slightly high 12.7dB of clock spectrum.
Fig. 3 be KPS erbium-doped fiber amplifier amplify after high-frequency microwave oscillation source spectrum through the nearly Dispersion Flattened Fiber group of 84.7kmTransmission is amplified the spectrum after 25dBm with Raman. Although luminous power reduces to some extent after high-frequency microwave oscillation source spectral transmissions, stillThere is good spectral characteristic.
Fig. 4 is the high-frequency microwave oscillation source electricity spectrum corresponding with Fig. 2 spectrum. Visible in figure, oscillation source electricity spectrum is stable, clear, canReach 28.52dB; Electricity spectrum single-frequency performance is good, its-ratio of three dB bandwidth and electric spectral frequency is 2.353 × 10-5。
Fig. 5 is the high-frequency microwave oscillation source electricity spectrum corresponding with Fig. 3 spectrum. After transmission, oscillation source electricity spectrum still has good listFrequently property, stable, clear, amplitude can reach 18.3dB, and suitably amplification can reach higher amplitude.
The associated arguments being measured from Fig. 2-Fig. 5, this patent method can be at 40GHz, 10Gbit/s high rate optical millimeterIn wave system system, provide a kind of remote high-frequency microwave generating source, to substitute the electric high-frequency local oscillation source in high rate optical millimeter wave up-link.
Claims (1)
1. a kind of remote high-frequency microwave generating source in optical millimeter wave system, comprise narrow linewidth Distributed Feedback Laser, optical polarization controller,40G high-speed wideband modulator, Agilent 43Gbit/s Error Detector 81250, broadband electric amplifier SHF803P, er-doped lightFiber amplifier, optical filter XTM50, shunt, combiner, 70GHz photodetector, broadband electric amplifier SHF806E,Frequency mixer 11970U, electric spectrometer E4440A, spectroanalysis instrument AQ6319, nearly Dispersion Flattened Fiber group, raman pump source,Wavelength division multiplexer; It is characterized in that: the laser that narrow linewidth Distributed Feedback Laser produces is after the shunt of 10:90 shunt, wherein90% laser enters 40G high-speed wideband modulator through optical polarization controller, and Agilent 43Gbit/s Error Detector 81250 is defeatedAfter the 10Gbit/s two-forty NRZ pseudo-random pulse data sequence signal going out amplifies via broadband electric amplifier SHF803PEnter 40G high-speed wideband modulator, narrow-linewidth laser is produced two-forty wide-band modulation light by Data Modulation simultaneously; As underThe two-forty wide-band modulation light of row optical millimeter wave signal section is amplified into optical filter through 17dBm erbium-doped fiber amplifierXTM50, obtains many times of clock spectrum after filtering, 10% the laser spectrum that this clock spectrum and shunt separate is through 1:99Combiner obtains high-frequency microwave oscillation source signal spectrum after closing road; Wherein clock spectrum enters combiner by 99% port; This heightFrequently microwave generating source signal bandwidth 40GHz, data rate 10Gbit/s; Height after KPS erbium-doped fiber amplifier amplifiesFrequently it is micro-that microwave generating source signal spectrum enters nearly Dispersion Flattened Fiber group transmission 84.7km arrival remote base stations formation remote high-frequencyRipple oscillation source; In the alternative high rate optical millimeter wave of the signal of telecommunication up-link forming after remote high-frequency microwave generating source beat frequencyElectricity high-frequency local oscillation source; In order to ensure signal transmission quality, the pump light that raman pump source produces enters optical fiber through wavelength division multiplexerGroup is carried out backward Raman amplification to high-frequency microwave oscillation source signal; After Raman amplifies, remote high-frequency microwave oscillation source signal enters70GHz photodetector beat frequency, is amplified into frequency mixer 11970U through broadband electric amplifier SHFS06E and carries out mixing,Finally by electric spectrometer E4440A Measurement and analysis signal electricity spectrality energy; Wherein, KPS erbium-doped fiber amplifier and light path link thereofCan use spectroanalysis instrument AQ6319 to measure the spectrum property of signal.
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| CN105099566A (en) * | 2015-06-30 | 2015-11-25 | 西安电子科技大学 | Device for generating millimeter wave signals by using double independent tunable fiber lasers |
| CN112217566B (en) * | 2020-10-22 | 2023-09-08 | 聊城大学 | Remote high-frequency microwave oscillation source system based on single-stage nonlinear spectrum expansion |
| CN112272059B (en) * | 2020-10-29 | 2023-09-29 | 聊城大学 | Remote high-frequency microwave oscillation source system based on two-stage nonlinear spread spectrum |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3570927B2 (en) * | 1999-07-21 | 2004-09-29 | 日本電信電話株式会社 | Optical fiber communication system using Raman amplification. |
| CN101951294A (en) * | 2010-08-05 | 2011-01-19 | 暨南大学 | Microwave/millimeter wave signal generating device with continuously tunable broadband |
| CN102629887A (en) * | 2012-05-09 | 2012-08-08 | 电子科技大学 | Full-duplex radio-over-fiber (RoF) access device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3570927B2 (en) * | 1999-07-21 | 2004-09-29 | 日本電信電話株式会社 | Optical fiber communication system using Raman amplification. |
| CN101951294A (en) * | 2010-08-05 | 2011-01-19 | 暨南大学 | Microwave/millimeter wave signal generating device with continuously tunable broadband |
| CN102629887A (en) * | 2012-05-09 | 2012-08-08 | 电子科技大学 | Full-duplex radio-over-fiber (RoF) access device |
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