CN103997375B - A kind of method and system producing quadruple frequency light load millimeter wave - Google Patents
A kind of method and system producing quadruple frequency light load millimeter wave Download PDFInfo
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Abstract
A kind of method and system producing quadruple frequency light load millimeter wave based on stimulated Brillouin scattering effect, the beat frequency utilizing stokes light and the pump light produced by Brillouin scattering increases the driving signal of Dare manipulator as Mach, laser instrument is exported light be modulated, realize self-starting feedback control loop, Brillouin scattering enlarge-effect is utilized to realize the suppression of the amplification to negative single order sideband and positive single order sideband, further enhance Stokes light intensity and corresponding feedback millimeter wave beat frequency, modulation depth is made to increase, and then strengthen the amplitude of positive and negative second order sideband, interleave wave filter by wavelength and separate 4 times of Brillouin shift f of generationBLight load millimeter wave exporting；The method does not need radio frequency source and complicated control system, it is only necessary to Mach increasing Dare manipulator, a wavelength interleave wave filter, one section of nonlinear dielectric, a photodetector and radio frequency amplifier and just can produce 4fBLight load millimeter-wave signal, there is stability height, shg efficiency is high, device cost is low advantage.
Description
Technical field
The present invention relates to optic communication and millimetre-wave attenuator field, the light carrier particularly relating to light load radio frequency (RoF) system centre station produces, it is provided that a kind of produce stability height, shg efficiency is high, cost is low light load millimeter wave generating method and system.
Background technology
RoF (RadiooverFiber) technology analog fiber optic link transmits microwave, millimeter-wave signal, combine optical communication technique and microwave communication techniques advantage, radio communication can be made to have the advantages such as the covering of wider array of honeycomb, broader bandwidth, relatively low cost, relatively low power consumption, there is important application prospect, be one of current international study hotspot.How to produce low noise, narrow linewidth, high stability light load millimeter wave be the key issue of RoF system.Nonlinear effect stimulated Brillouin scattering (SBS) in optical fiber is applied to RoF system by this patent, to produce high-quality light load millimeter-wave signal required in RoF system.
Nonlinear dielectric (NLM) is under the effect of pump light, one can be produced relative to the stoke light that flashlight frequency displacement is the frequency displacement of background of cloth source, high owing between stokes light and pump light that stimulated Brillouin scattering produces being degree of coherence, and utilize that stimulated Brillouin scattering frequency multiplication simple in construction, live width are extremely narrow, threshold power is low, intensity noise is low, frequency stable, therefore, utilize SBS to produce high-order frequency doubled light signal and there is good application prospect.
SBS process can be described as pumping light wave classically, the parameter asked of Stokes light wave harmony ripple interacts.Pump light is by producing acoustic wave to the electrostriction of nonlinear dielectric, and the refractive index periodic of nonlinear dielectric is modulated by this acoustic wave, produces refractive-index grating.When flashlight is by this grating, due to the Bragg scattering of grating, back scattering produces stokes light.For silica fibre, when 1550nm incident pump ripple, single order stoke light is about 11GHz relative to the frequency displacement of flashlight.
The SBS that utilizes having been proposed that at present produces the scheme of times frequency optical millimeter waves, substantially can be classified as three classes: produce light load millimeter wave by two independent light sources, light load millimeter wave is produced by the external optical modulator of radiofrequency signal by light source, the laser instrument exported by a kind of double frequency produces light load millimeter wave, i.e. Brillouin optical fiber laser BFL.
In first method, light load millimeter wave is produced by two independent light sources, the method is used for producing the two-beam ripple of millimeter wave from two independent laser instrument, although simple in construction, but the drift of phase noise and two laser instrument each frequencies directly converts and is carried on the millimeter-wave signal of output, and effect of noise is very big.Second method, connects external optical modulator by a light source and produces light load millimeter wave, and due to the narrow-band characteristic of brillouin gain, stimulated Brillouin scattering effect is used as narrow-band amplifier, amplifies sideband.But system structure is complicated and needs to refer to light.The third method, the laser instrument exported by a kind of double frequency produces light load millimeter wave, although having realized the output of high-order frequency multiplication, and Wavelength strength ratio is more uniform, but the impact by the factor such as higher-order nonlinear system and ambient temperature is bigger, avoid the frequency drift of each longitudinal mode, it is necessary to complicated control system and accurately complicated parameter regulate and bandwidth is all in MHz magnitude.These are all based on stimulated Brillouin scattering effect and produce times frequency optical millimeter waves method, all there is the problem needing to solve.
This patent is intended by proposing a kind of new method and system producing quadruple frequency light load millimeter wave based on stimulated Brillouin scattering effect, owing to pump light and flashlight are from same light source, and utilize the modulating characteristic of Lithium metaniobate Mach-Zehnder modulators, each frequency content produced to have narrower live width (reaching kHz magnitude) and higher coherence.And owing to adopting feedback link, utilize the beat frequency of the stokes light that produced by Brillouin scattering and pump light to realize self-starting and feedback as the driving signal of Mach-Zehnder modulators MZM, it is not necessary to additional radio frequency source.It addition, only employ the single order stokes wave that stimulated Brillouin scattering produces in system, the impact by the factor such as higher-order nonlinear system and ambient temperature is less, and stability is high, does not need the control system of complexity.The method can produce the high-quality double frequency constant amplitude light load millimeter wave of 40GHz frequency range, and requirement and the implementation cost 26S Proteasome Structure and Function low, system of system equipment is simple, and reliability is high.
Summary of the invention
For solving the problems referred to above, the present invention provides a kind of new method and system producing quadruple frequency light load millimeter wave based on stimulated Brillouin scattering SBS.
The invention provides a kind of method producing quadruple frequency light load millimeter wave based on stimulated Brillouin scattering effect, the generation of light load millimeter wave in radio frequency RoF system is carried for light, utilizing the beat frequency of the stokes light that produced by Brillouin scattering and pump light to realize self-starting and feedback control loop as the driving signal of Mach-Zehnder modulators (MZM), the positive and negative second order sideband of generation interleaves wave filter (interleaver) by wavelength and separates 4 times of Brillouin shift f of generationBLight load millimeter wave, and export；The method does not need radio frequency source, it is only necessary to MZM, a wavelength interleave wave filter, one section of nonlinear dielectric, a photodetector (PD) and radio frequency amplifier (EA) and just can produce 4fBLight load millimeter-wave signal, there is stability height, shg efficiency is high, device cost is low advantage, it is characterised in that comprising:
Frequency is f0The light wave that sends of laser instrument be divided into two bundles through bonder, wherein a branch of as flashlight through the modulation of Lithium metaniobate Mach-Zehnder modulators with after wavelength interleaves wave filter, one section of nonlinear dielectric (can be Standard single-mode fiber or nonlinear optical fiber, it is also possible to be able to produce any gas of stimulated Brillouin scattering, liquid and solid dielectric) is injected from one end；Another bundle, after EDFA Erbium-Doped Fiber Amplifier (EDFA) amplifies, injects the nonlinear dielectric pump light as SBS from the other end；
Owing to flashlight is identical with pump light frequency and the direction of propagation contrary, the principle according to SBS, at initial period, MZM does not drive signal；It is f that flashlight only comprises frequency0Radio-frequency component, under the effect of pump light, with flashlight equidirectional produce frequency be f0-fBBrillouin's sideband, this sideband and flashlight f0Being converted to the signal of telecommunication through photoelectric detector PD beat frequency, wherein, frequency is Brillouin shift fBRadiofrequency signal amplified as driving signal input to MZM；
By arranging, suitable MZM DC offset voltage makes odd-order sideband be suppressed by part, even-order sideband has by a relatively large margin, interleave wave filter through wavelength and signal is divided into two parts, wherein, centered carrier and positive and negative single order sideband part are still extracted and are injected into nonlinear dielectric, due to excited Brillouin enlarge-effect, positive single order sideband suppresses further, and negative single order sideband is exaggerated, thus the radiofrequency signal through photoelectric detector PD beat frequency gained strengthens；And then strengthening the MZM second order sideband exported, the optical signal of MZM output interleaves wave filter through wavelength and isolates this sideband of second order, as the output of whole frequency doubling system, obtains the double frequency constant amplitude light load millimeter wave of 40GHz frequency range；
Owing to pump light and flashlight are from same light source, so each frequency content produced has narrower live width and higher coherence；
As a kind of method for optimizing, in system: adopt Lithium metaniobate Mach-Zehnder modulators, for realizing the rf modulations of flashlight, response frequency and drive circuit frequency are all not less than fB, it is offset near maximum transmitted point, regulates bias voltage and drive the amplitude of signal, obtain comprising the output of flashlight, positive and negative single order sideband more by a small margin and second order sideband by a relatively large margin；
As a kind of method for optimizing, in system: it is separated with positive and negative second order sideband with positive and negative single order sideband by signal carrier that wavelength interleaves wave filter, useful sideband can not only be extracted and export as system, the sideband components that need not export can also be leached and inject nonlinear dielectric simultaneously；It should be noted that the outfan at interleaver to connect isolator, to prevent reverse pump light from injecting；
As a kind of method for optimizing, in system: nonlinear dielectric (NLM) can be Standard single-mode fiber or nonlinear optical fiber, it is also possible to be able to produce any gas of stimulated Brillouin scattering, liquid and solid；To other nonlinear dielectric, it is necessary to ensure that flashlight overlaps with the effective of spatial mode field with pump light efficient coupling in nonlinear dielectric；
The present invention provides a kind of system producing quadruple frequency light load millimeter wave based on SBS effect, comprising:
Laser instrument Laser, photo-coupler (Coupler), Lithium metaniobate Mach-Zehnder modulators (MZM), wavelength interleave wave filter (interleaver), optoisolator (Isolator), erbium-doped fiber amplifier (EDFA), nonlinear dielectric (HNLM), optical circulator (Circulor), photodetector (PD) and radio frequency amplifier (EA)；
Laser instrument: producing required frequency is f0Narrow linewidth light wave；
Photo-coupler: being divided into two bundles for laser instrument is sent light wave, wherein a branch of modulation as flashlight through Lithium metaniobate Mach-Zehnder modulators, the pump light of another Shu Zuowei SBS injects from the other end of nonlinear dielectric；
Lithium metaniobate Mach-Zehnder modulators: for realizing the rf modulations of flashlight, produces the output of centered carrier, positive and negative single order sideband more by a small margin and second order sideband by a relatively large margin；
Wavelength interleaves wave filter: for second order sideband and centered carrier and single order sideband being easily separated, and exports the positive and negative second order sideband output signal as whole system from one end；Another output of interleaver comprises centered carrier and positive and negative single order sideband, is connected with nonlinear dielectric by optoisolator；
Optoisolator: can make to comprise centered carrier and positive and negative single order sideband is injected into nonlinear dielectric, stop the pump light through nonlinear dielectric to affect laser instrument and photomodulator；
Erbium-doped fiber amplifier: realize optical signal amplification and loss balancing so that pumping light power is more than threshold value, it is ensured that Stimulated Brillouin Scattering Process is normally carried out；
Nonlinear dielectric: as the medium of stimulated Brillouin scattering, under the effect of inverse injection pump light, producing one with flashlight frequency interval is fBStokes light, or utilize Brillouin scattering enlarge-effect to realize amplifying and the suppression of positive single order sideband negative single order sideband, further enhance Stokes light intensity and corresponding feedback millimeter wave beat frequency, produce the light carrier of Brillouin shift；
Optical circulator: for Brillouin's coupling pump light enters nonlinear dielectric, is coupled out the light carrier and flashlight that produce Brillouin shift again on the other hand；
Photodetector: be used for realizing frequency interval fBLight carrier and the beat frequency of flashlight, being converted into frequency is fBRf signal, realize modulation to flashlight through providing big rear drive MZM；
Radio frequency amplifier: being used for amplifying the PD frequency produced is fBRadiofrequency signal, its bandwidth is not less than fB；
System feedback loop structure, interleave wave filter, optoisolator, nonlinear dielectric, optical circulator, photodetector and radio frequency amplifier by Lithium metaniobate Mach-Zehnder modulators, wavelength and constitute loop, after system stability, through MZM, light wave being modulated with the beat signal that excited Brillouin enlarge-effect produces for feedback, concurrently forming frequency is 4fBStable light load millimeter wave output, it is not necessary to radio-frequency signal source.
After adopting technical scheme provided by the invention, system is owing to pump light and flashlight are from same light source, and utilizes the modulating characteristic of Lithium metaniobate Mach-Zehnder modulators, so each frequency content produced has narrower live width and higher coherence；
System uses a wavelength to interleave wave filter, useful sideband can not only be extracted and export as system, the sideband components that need not export can also be leached and inject nonlinear dielectric simultaneously, it is not necessary to other wave filter are assisted, simplify system structure and function, reduce cost；
Owing to adopting feedback arrangement, the beat frequency of the stokes light that produced by Brillouin scattering and pump light is utilized to realize self-starting and feedback link as the driving signal of Mach-Zehnder modulators MZM, without additional radio frequency source, not only simplify system structure and function, reduce power consumption, saving cost, and stability is high, shg efficiency is high；
And system only employs the single order stokes wave that stimulated Brillouin scattering produces, impact by the factor such as higher-order nonlinear system and ambient temperature is less, therefore the control system that the method need not be complicated, decreases the requirement to system equipment and implementation cost.
Accompanying drawing explanation
Fig. 1 show system link figure
Detailed description of the invention
The present invention proposes a kind of method producing quadruple frequency light load millimeter wave based on stimulated Brillouin scattering SBS effect, the generation of light load millimeter wave in radio frequency RoF system is carried for light, utilizing the beat frequency of the stokes light that produced by Brillouin scattering and pump light to realize self-starting and feedback control loop as the driving signal of Mach-Zehnder modulators MZM, the positive and negative second order sideband of generation is separated by interleaver and produces 4 times of Brillouin shift fBLight load millimeter wave；The method does not need radio frequency source, it is only necessary to MZM, interleaver, one section of optical fiber just can produce 4f as nonlinear dielectric and a PDBLight load millimeter-wave signal, there is stability height, shg efficiency is high, device cost is low advantage, it is necessary to adopt following step:
First, as it is shown in figure 1, frequency is f0=193.548THz (1550nm), live width are that the light that the narrow linewidth laser of 50kHz sends is divided into two bundles through 3dB photo-coupler, wherein a branch of as flashlight through Lithium metaniobate Mach-Zehnder modulators (LiNbO3Mach-Zehndermodulator, LN-MZM) modulation and after wavelength interleaves wave filter (interleaver), inject from one end high non-linearity dispersion shift silica fibre (HNLF) of one section of 1km；Another bundle as the pump light of SBS, passes through light annular device injection fibre from the other end, if laser output power is sufficiently large, it may not be necessary to through EDFA after EDFA Erbium-Doped Fiber Amplifier EDFA is amplified to 5dBm.
For silica fibre, when 1550nm incident pump ripple, the frequency displacement between pumping wave and single order stoke ripple is about 11GHz；Adopt high non-linearity silica fibre (HNLF) as SBS medi um, have only to less pump power and shorter length and efficient nonlinear interaction effect is reached with regard to passable, and less by the impact of practical service environment, the excited Brillouin frequency displacement of therefore its generation is stable.
In HNLF, owing to flashlight is identical with pump light frequency and the direction of propagation contrary, the principle according to SBS, at initial period, MZM does not drive signal；It is f that flashlight only comprises frequency0The radio-frequency component of=193.548THz, under the effect of pump light, is f in the equidirectional generation frequency of flashlight0-fBBrillouin's sideband (f here of=193.537THzB≈ 11GHz), this sideband and flashlight f0Being converted to frequency through photoelectric detector PD beat frequency is Brillouin shift fBThe signal of telecommunication of=11GHz, this signal is amplified as driving signal to input to MZM.
Now, Lithium metaniobate Mach-Zehnder modulators, it is offset near maximum transmitted point, response frequency and drive circuit frequency are all not less than fB(≈ 11GHz), regulates bias voltage and drives the amplitude of signal, obtaining comprising flashlight f0, positive and negative single order sideband f more by a small margin0±fBSecond order sideband f by a relatively large margin0±2fBOutput；Through interleaver (can be 25/50GHz or 33/66GHz), signal being divided into two parts, wherein, centered carrier and positive and negative single order sideband part are still extracted and are injected into HNLF, due to excited Brillouin enlarge-effect, positive single order sideband f0+fB=193.559THz suppresses further, and negative single order f0-fB=193.537THz sideband is exaggerated, thus the radiofrequency signal through PD beat frequency gained strengthens；And then strengthening the MZM second order sideband exported, frequency is f0+2fB=193.570THz and f0-2fBThe optical signal of=193.526THz, MZM output isolates this second order sideband through interleaver, as the output of whole frequency doubling system, obtains the double frequency constant amplitude light load millimeter wave of 40GHz frequency range.
The beat signal that this system produces with stimulated Brillouin scattering effect at initial period is feedback, after stable, the beat signal produced with excited Brillouin enlarge-effect for feedback through MZM modulated light wave.
The method and system based on stimulated Brillouin scattering generation quadruple frequency light load millimeter wave that the present invention adopts has the advantages that
(1) owing to pump light and flashlight are from same light source, and the modulating characteristic of Lithium metaniobate Mach-Zehnder modulators is utilized, so each frequency content produced has higher coherence；
(2) system uses an interleaver, useful sideband can not only be extracted and export as system, the sideband components that need not export can also be leached and inject nonlinear dielectric simultaneously, it is not necessary to other wave filter are assisted, simplify system structure and function, reduce cost；
(3) owing to adopting feedback arrangement, the beat frequency of the stokes light that produced by Brillouin scattering and pump light is utilized to realize self-starting and feedback control loop as the driving signal of Mach-Zehnder modulators MZM, without additional radio frequency source, not only simplify system structure and function, reduce power consumption, saving cost, and stability is high, shg efficiency is high；
(4) and system only employs stimulated Brillouin scattering produce single order stokes light, impact by the factor such as higher-order nonlinear system and ambient temperature is little, therefore the control system that the method need not be complicated, decreases the requirement to system equipment and implementation cost.
In sum, the present invention utilizes stimulated Brillouin scattering SBS effect to create the light load millimeter wave of 40GHz frequency range, utilizing the beat frequency of the stokes light that produced by Brillouin scattering and pump light to realize self-starting and feedback control loop as the input of Mach-Zehnder modulators MZM, the positive and negative second order sideband of generation is separated by interleaver and produces 4 times of Brillouin shift fBLight load millimeter wave, and export；The method need not extra radio frequency source, there is coherence's height, flatness is high, frequency stability is high, shg efficiency is high advantage.And owing to the method is less by the impact of the factor such as higher-order nonlinear system and ambient temperature, can be used for the generation of light load radio frequency RoF system light load millimeter wave, do not need complicated control system, decrease the requirement to RoF system equipment, simplify the 26S Proteasome Structure and Function of system, reduce power consumption, provide cost savings, add the reliability of RoF system light load millimeter wave optics generating section.
The above; being only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; change can be readily occurred in or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (5)
1. the method producing quadruple frequency light load millimeter wave based on stimulated Brillouin scattering effect, it is characterised in that it comprises the steps:
Frequency is f0The light wave that sends of laser instrument be divided into two bundles through photo-coupler, wherein a branch of as flashlight after Lithium metaniobate Mach-Zehnder modulators MZM modulation and wavelength interleave wave filter, inject one section of nonlinear dielectric from one end；Another bundle, after EDFA Erbium-Doped Fiber Amplifier EDFA amplifies, injects the nonlinear dielectric pump light as stimulated Brillouin scattering SBS from the other end；
Owing to flashlight is identical with pump light frequency and the direction of propagation contrary, according to stimulated Brillouin scattering principle, at initial period, MZM does not drive signal；It is f that flashlight only comprises frequency0Radio-frequency component, with frequency pump light effect under, with flashlight equidirectional produce frequency be f0-fBStokes sideband, this Stokes sideband and flashlight f0 are converted to the signal of telecommunication through photodetector beat frequency, and wherein, frequency is Brillouin shift fBRadiofrequency signal amplified as driving signal input to MZM；
By arrange suitable MZM DC offset voltage make odd-order sideband by part suppress and even-order sideband has by a relatively large margin, interleave wave filter through wavelength and signal is divided into two parts, wherein, centered carrier and positive and negative single order sideband part are still extracted and are injected into nonlinear dielectric, due to excited Brillouin enlarge-effect, positive single order sideband is suppressed more, and negative single order sideband is exaggerated, thus the radiofrequency signal through photoelectric detector PD beat frequency gained strengthens；And then strengthening the MZM second order sideband exported, the optical signal of MZM output interleaves wave filter through wavelength and isolates this second order sideband, as the output of whole frequency doubling system, obtains 4 times of Brillouin shift fBDouble frequency constant amplitude light load millimeter wave.
2. method according to claim 1, it is characterised in that described Lithium metaniobate Mach-Zehnder modulators:
Adopting Lithium metaniobate Mach-Zehnder modulators, for realizing the rf modulations of flashlight, response frequency and drive circuit frequency are all not less than fB, it is offset near maximum transmitted point, obtains comprising the output of centered carrier, positive and negative single order sideband more by a small margin and second order sideband by a relatively large margin by regulating bias voltage.
3. method according to claim 1, it is characterised in that described wavelength interleaves wave filter:
It is separated with positive and negative second order sideband with positive and negative single order sideband by signal carrier that wavelength interleaves wave filter, can not only be extracted by useful sideband and export as system, can also be leached by the sideband components that need not export and inject nonlinear dielectric simultaneously；It should be noted that interleaving filter output at wavelength is connected to optoisolator to prevent reverse pump light from injecting.
4. method according to claim 1, it is characterised in that described nonlinear dielectric:
Can be Standard single-mode fiber or nonlinear optical fiber, it is also possible to be able to produce any gas of stimulated Brillouin scattering, liquid and solid dielectric；To other nonlinear dielectric, it is necessary to ensure that flashlight overlaps with the effective of spatial mode field with pump light efficient coupling in nonlinear dielectric.
5. the system producing quadruple frequency light load millimeter wave based on stimulated Brillouin scattering SBS effect, it is characterised in that described system:
Including: laser instrument Laser, photo-coupler coupler, Lithium metaniobate Mach-Zehnder modulators MZM, wavelength interleave wave filter interleaver, optoisolator isolator, erbium-doped optical fiber amplifier EDFA, nonlinear dielectric NLM, optical circulator circulor, photoelectric detector PD and radio frequency amplifier EA；
Laser instrument: producing required frequency is f0Narrow linewidth light wave；
Photo-coupler: being divided into two bundles for laser instrument is sent light wave, wherein a branch of modulation as flashlight through Lithium metaniobate Mach-Zehnder modulators, the pump light of another Shu Zuowei SBS injects from the other end of nonlinear dielectric；
Lithium metaniobate Mach-Zehnder modulators: for realizing the rf modulations of flashlight, produces the output of centered carrier, positive and negative single order sideband more by a small margin and second order sideband by a relatively large margin；
Wavelength interleaves wave filter: for second order sideband and centered carrier and single order sideband being easily separated, and exports the positive and negative second order sideband output signal as whole system from one end；Wavelength interleaves another output of wave filter and comprises centered carrier and positive and negative single order sideband, is connected with nonlinear dielectric by optoisolator；
Optoisolator: can make to comprise centered carrier and positive and negative single order sideband is injected into nonlinear dielectric, stop the pump light through nonlinear dielectric to affect laser instrument and photomodulator；
Erbium-doped fiber amplifier: realize optical signal amplification and loss balancing so that pumping light power, more than threshold value, produces effective Stokes luminous power；
Nonlinear dielectric: as the medium of stimulated Brillouin scattering, at inverse injection with under the effect of frequency pump light, producing one with flashlight frequency interval is fBStokes light, or utilize Brillouin scattering enlarge-effect to realize amplifying and the suppression of positive single order sideband negative single order sideband, further enhance Stokes light intensity and corresponding feedback millimeter wave beat frequency, produce the light carrier of Brillouin shift；
Optical circulator: for Brillouin's coupling pump light enters nonlinear dielectric, is coupled out the light carrier and flashlight that produce Brillouin shift again on the other hand；
Photodetector: be used for realizing frequency interval fBLight carrier and the beat frequency of flashlight, being converted into frequency is fBRf signal, realize being f to frequency through providing big rear drive MZM0The modulation of flashlight；
Radio frequency amplifier: the frequency produced for amplifying photodetector is fBRadiofrequency signal, its bandwidth is not less than fB；
System feedback loop structure, interleave wave filter, optoisolator, nonlinear dielectric, optical circulator, photodetector and radio frequency amplifier by Mach-Zehnder modulators, wavelength to constitute, after system stability, through Mach-Zehnder modulators, light wave being modulated with the beat signal that excited Brillouin enlarge-effect produces for feedback, concurrently forming frequency is 4fBStable light load millimeter wave output.
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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 |
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| CN111224717B (en) * | 2020-01-14 | 2020-12-29 | 中国人民解放军陆军工程大学 | Microwave signal frequency doubling device and method |
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