CN106356700B - A kind of method and apparatus generating high stability microwave and millimeter wave source - Google Patents
A kind of method and apparatus generating high stability microwave and millimeter wave source Download PDFInfo
- Publication number
- CN106356700B CN106356700B CN201611030152.1A CN201611030152A CN106356700B CN 106356700 B CN106356700 B CN 106356700B CN 201611030152 A CN201611030152 A CN 201611030152A CN 106356700 B CN106356700 B CN 106356700B
- Authority
- CN
- China
- Prior art keywords
- signal
- light
- frequency
- microwave
- millimeter wave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000005622 photoelectricity Effects 0.000 claims abstract description 64
- 238000001228 spectrum Methods 0.000 claims abstract description 49
- 230000003595 spectral effect Effects 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 230000035559 beat frequency Effects 0.000 claims abstract description 18
- 239000000835 fiber Substances 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims description 44
- 230000009977 dual effect Effects 0.000 claims description 17
- 230000010355 oscillation Effects 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 9
- 230000002902 bimodal effect Effects 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 4
- 230000033228 biological regulation Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000000243 solution Substances 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 4
- 239000013307 optical fiber Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000010363 phase shift Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000007363 ring formation reaction Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
- H01S1/02—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range solid
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
Abstract
A kind of method and apparatus generating high stability microwave and millimeter wave source, is related to photoelectron and microwave and millimeter wave technical field, present invention is primarily based on following designs: carrying out spectrum using fiber grating pair broadband spectral source signal and cuts to obtain homologous dual-wavelength laser；Then frequency spectrum expansion is carried out to two laser signals respectively using photoelectricity mixing loop, realizes the discrete equidistant spectrum cluster centered on light carrier；Target discrete spectrum cluster is finally chosen again and carries out quadratic detection, carries out after beat frequency the final output for realizing Low phase noise microwave and millimeter wave single frequency point signal by narrow-band filtering.The microwave and millimeter wave source that the above method and device generate is primarily present following advantages: (1) Low phase noise；(2) full frequency band is adjustable.
Description
Technical field
The present invention relates to photoelectron and microwave and millimeter wave technical field, in particular to a kind of generation high stability microwave millimeter
The method and device of wave source.
Background technique
The microwave and millimeter wave signal source of high stability is the core devices of electronic communication system.The microwave and millimeter wave of high quality
Signal source plays an important role in directions such as optic communication, satellite communication, microwave communication and high-acruracy surveys.For single-frequency point
Signal source commonly uses phase noise (mutually making an uproar) to measure the quality of microwave and millimeter wave signal source short-term stability.
Traditional microwave and millimeter wave source generation technology includes three kinds of crystal oscillator frequency multiplication, optical beat and optoelectronic oscillation schemes.It is brilliant
Vibration frequency doubling technology generation microwave and millimeter wave source, which refers to, generates microwave and millimeter wave by many times frequency multiplication of crystal oscillator, but with frequency multiplication number
Increase, mutually making an uproar can be increasing, that is to say, that mutually making an uproar can increase with the increase of carrier frequency；Optical beat technology is
Two single-frequency laser signal input photodetectors are subjected to " square-law " detection, realize that beat frequency obtains microwave and millimeter wave signal,
The technology mutually make an uproar to two-laser require it is particularly harsh, and require two laser signals phase information must " synchronization ", and can
Tonality is poor；Optical-electronic oscillator be generate Low phase noise microwave and millimeter wave single frequency point signal effective means, but oscillation signal frequency by
It is limited to the working frequency of photoelectric device (mainly electrooptic modulator).In conclusion traditional microwave and millimeter wave source generation technology
Have the shortcomings that stability is bad and frequency range adjustability is poor.
Summary of the invention
The technical problem to be solved in the present invention is to provide one kind for generating high stability and the adjustable microwave milli of full frequency band
The method and device in metric wave source.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme: a kind of generation high stability microwave millimeter
The device of wave source, comprising:
Homologous dual wavelength module, for generating homologous dual-wavelength laser and shunting it to the first photoelectricity mixing loop and
Two photoelectricity mixing loops；The homologous dual wavelength module includes broadband spectral source, fiber grating and solution wavelength division multiplexer, the width
Band spectrum source provides broadband optical signal source, and the fiber grating has bimodal narrow-band filtering, double for carrying out to broadband spectral
Frequency range cutting generates homologous dual-wavelength laser, and the solution wavelength division multiplexer connects the first photoelectricity mixing loop and the second photoelectricity is mixed
The homologous dual-wavelength laser is simultaneously branched to the first photoelectricity mixing loop and the second photoelectricity mixing loop by cyclization road；
First photoelectricity mixing loop and the second photoelectricity mixing loop realize expansion for composing to laser, generate discrete equidistant
Spectrum cluster；The first photoelectricity mixing loop includes electro-optic intensity modulator 1, photo-coupler 1, light delay unit 1, photodetection
Device 1, electric narrow band filter 1 and electric amplifier 1；The second photoelectricity mixing loop includes electro-optic intensity modulator 2, photoelectric coupling
Device 2, light delay unit 2, photodetector 2, electric narrow band filter 2 and electric amplifier 2, the electricity narrow band filter 1 and electricity are narrow
2 corresponding matching light delay unit 1 of band filter and light delay unit 2 are used for frequency-selecting, and the electro-optic intensity modulator 1 and electric light are strong
Modulator 2 is spent for realizing electro-optic conversion, and the photodetector 1 and photodetector 2 are for realizing photoelectric conversion, the light
Coupler 1 and photo-coupler 2 are shunted for optical signal, and the electric amplifier 1 and electric amplifier 2 are for the electric light in compensation loop
Transmission and transition loss, noise in the first photoelectricity mixing loop and the second photoelectricity mixing loop continuous reality inside loop
Existing photoelectricity/electro-optic conversion and circulation, the electric signal for meeting Barkhausen criterion finally realize oscillation, and defeated at photo-coupler end
Out, the intensity modulated to light carrier is completed, realizes the discrete equidistant expansion centered on carrier wave；
Optical narrow pass band filters 1 and optical narrow pass band filters 2, are respectively used to the first photoelectricity mixing loop and the second photoelectricity
The discrete equidistant spectrum cluster for mixing loop carries out frequency-selecting；
Photo-coupler 3, for discrete etc. to what is chosen from the first photoelectricity mixing loop and the second photoelectricity mixing loop
Multiplex is carried out away from spectrum cluster；
Photodetector 3, for carrying out quadratic detection to the optical signal of input, completing photo-beat frequency and exporting microwave millimeter
Wave signal；
Electric narrow band filter 3 is used for frequency-selecting, inhibits to clutter, final to obtain target microwave and millimeter wave single-frequency point letter
Number.
As another aspect of the present invention, a method of generating high stability microwave and millimeter wave source, comprising the following steps:
Step 1 generates homologous dual-wavelength laser；
Step 2, separation dual-wavelength laser；
Step 3 composes laser and realizes expansion, generates the discrete equidistant spectrum cluster of two branches；
Step 4, the discrete equidistant spectrum cluster based on two branches are chosen to the equidistant component of beat frequency；
Step 5 realizes spectrum beat frequency based on quadratic detection, and output is realized after filtering.
Wherein, two-band cutting is carried out using the broadband spectral in mode transmission fiber grating pair broadband spectral source in step 1, from
And obtain homologous dual-wavelength laser.
Wherein, homologous dual wavelength single laser is separated using solution wavelength division multiplexer in step 2.
Wherein, amplitude modulation is first carried out to isolated light carrier noise using electro-optic intensity modulator in step 3, so
Enter light delay unit after shunting afterwards by photo-coupler and realize delay, optical signal passes through photodetector progress square after delay
Detection to be restrained, electric signal is restored, electric signal carries out frequency-selecting by narrow band filter again, and realizes loss balancing by electric amplifier,
It is finally-transmitted to the electrical input of electro-optic intensity modulator, light carrier is modulated again and is recycled next time, finally
Stable oscillator signal is generated, oscillator signal is increasing to cause the non-linear of loop to be more and more obvious, and divided ring gain is realized
Compression, when gain is compressed into 1, oscillation signal power is not further added by, and final realize stablizes output.
Wherein, narrowband frequency-selecting is carried out to the discrete equidistant spectrum cluster of two branches respectively using optical narrow pass band filters in step 4,
And multiplex is carried out by photo-coupler.
Wherein, quadratic detection is carried out to input optical signal using photodetector in step 5, restores electric signal, finally
The output of microwave and millimeter wave signal is realized by narrow band filter.
There are following advantages: (1) Low phase noise in the microwave and millimeter wave source that the above method and device generate.Due to two optical carrier sources
In same light source, optical carrier phase noise can cancel out each other after being exported by beat frequency, overcome light carrier and mutually make an uproar and believe output
Number negative effect mutually made an uproar；And spectrum is expanded and is based on photoelectricity mixing loop, introduces extremely low phase while expanding spectrum and makes an uproar
Sound ensure that microwave and millimeter wave output signal is mutually made an uproar with extremely low；(2) full frequency band is adjustable.It, can based on structure involved by the present invention
To realize that area of light is adjusted to output signal by the dual wavelength interval for adjusting fiber grating；It can also be by adjusting photoelectricity mixing
The centre frequency of narrow band filter passband built in loop and the amount of delay size of built in light delay unit to realize output signal
Electrical domain is adjusted, and the dual regulation based on area of light and electrical domain is, it can be achieved that the full frequency band of microwave and millimeter wave, even terahertz wave band covers
With adjusting.
Detailed description of the invention
Fig. 1 is the involved implementation steps figure for generating high stability microwave and millimeter wave source method of the present invention；
Fig. 2 is the involved basic block diagram for generating high stability microwave and millimeter wave source device of the present invention；
Fig. 3 is present invention output microwave signal power spectrum density figure；
Fig. 4 is photoelectricity mixing loop oscillation electric signal and exports the actual measurement of microwave and millimeter wave signal and mutually make an uproar datagram.
Specific embodiment
For the ease of the understanding of those skilled in the art, the present invention is made further below with reference to embodiment and attached drawing
Bright, the content that embodiment refers to not is limitation of the invention.
It needs to illustrate in advance, in the description of the present invention, term " homologous " refers to that two different wave length laser are derived from
Same light source, that is to say, that two laser phases almost synchronize, and are easy to implement cancelling out each other for two phase place parasitic noise after beat frequency,
To avoid light carrier from mutually making an uproar the influence mutually made an uproar to microwave and millimeter wave signal.In addition, term " first ", " second " etc. are only used for retouching
Purpose is stated, relative importance is not understood to indicate or imply or implicitly indicates the quantity of indicated technical characteristic.
Present invention is primarily based on following designs: carrying out area of light using fiber grating pair broadband spectral source signal and cuts to obtain together
Source dual-wavelength laser；Then frequency spectrum expansion is carried out to two laser signals respectively using photoelectricity mixing loop, realization is with light carrier
The discrete equidistant spectrum cluster at center；Finally choose again target discrete spectrum cluster carry out quadratic detection, carry out beat frequency after through narrow
Band filtering, the final output for realizing Low phase noise microwave and millimeter wave single frequency point signal.
New equipment main structure according to the present invention is as shown in Figure 2, comprising:
One, broadband spectral source, fiber grating and solution wavelength division multiplexer, above three device realize " homologous dual wavelength " mould
Block, and send two branch photoelectricity mixing loops up and down to.Specifically, broadband spectral source provides broadband optical signal source；Optical fiber light
Grid have bimodal narrow-band filtering, for generating " homologous dual wavelength " laser after the carry out two-band cutting to broadband spectral；Solution
Wavelength division multiplexer is used to realize the double-wavelength light source and shunt, and is separately connected two branch photoelectricity mixing loops up and down.
Two, electro-optic intensity modulator 1, photo-coupler 1, light delay unit 1, photodetector 1, electric narrow band filter 1 with
The first photoelectricity mixing loop that electric amplifier 1 is constituted；Electro-optic intensity modulator 2, photoelectrical coupler 2, light delay unit 2, photoelectricity
The second photoelectricity mixing loop that detector 2, electric narrow band filter 2 are constituted with electric amplifier 2.Specifically, mixed in the first photoelectricity
In cyclization road and the second photoelectricity mixing loop, electric narrow band filter is used for frequency-selecting, electro-optic intensity modulator with light combination delay unit
For realizing electro-optic conversion, photodetector is shunted for realizing photoelectric conversion, photo-coupler for optical signal, and electric amplifier is used
In in compensation loop electro-optical transfer and transition loss.Noise (including active optical component and electrical part in photoelectricity mixing loop
The overall noise of generation) photoelectricity/electro-optic conversion and circulation are constantly realized inside loop, meet " Barkhausen " condition (corresponding frequency
Point open-loop gain is greater than 1, and phase shift is the integral multiple of 2 π) electric signal finally realize oscillation, and exported at photo-coupler end, completion
To the intensity modulated of light carrier, the discrete equidistant expansion centered on carrier wave is realized.
Three, optical narrow pass band filters 1, optical narrow pass band filters 2, photo-coupler 3, electric narrow band filter 3；Optical narrow pass band filters 1
The discrete equidistant spectrum exported to the first photoelectricity mixing loop with the second photoelectricity mixing loop is respectively used to optical narrow pass band filters 2
Cluster carries out frequency-selecting；Photo-coupler 3 is used to carry out multiplex to the light wave of two branches；Photodetector 3 be used for input optical signal into
Row " square-law " detection completes photo-beat frequency and exports microwave and millimeter wave signal；Electric narrow band filter 3 be used for frequency-selecting, to clutter into
Row inhibits, final to obtain target microwave and millimeter wave single frequency point signal.
New method according to the present invention is as shown in Figure 1, comprising the following steps:
Step 1 generates homologous dual-wavelength laser.
" seed source " of the broadband spectral source as dual-wavelength laser can be used in above-mentioned steps, using with bimodal narrowband
Its broadband spectral of the fiber grating pair of filtering performance carries out two-band cutting, finally obtains dual-wavelength laser.
Step 2, separation dual-wavelength laser, provide light source for two photoelectricity mixing loops.
Branch is carried out to dual wavelength single laser using solution wavelength division multiplexer, is respectively transmitted and is mixed to upper and lower two branches photoelectricity
Loop.
Step 3 composes laser using photoelectricity mixing loop and realizes expansion, and discrete equidistant spectrum cluster is generated.
Light carrier carries out amplitude modulation to noise by photoelectricity intensity modulator, prolongs after being shunted by photo-coupler into light
Shi Danyuan realizes delay, and optical signal carries out " square-law " detection by photodetector after delay, restores electric signal, and electric signal is logical
It crosses narrow band filter and carries out frequency-selecting, and loss balancing is realized by electric amplifier, be finally-transmitted to the electricity of electro-optic intensity modulator
Input terminal is again modulated light carrier and is recycled next time.For certain special frequency points, if the delay pair of its loop
The phase-shift phase answered is the integral multiple of 2 π and open-loop gain is greater than 1, then the frequency signal is after repeatedly recycling in output port
Realize cophase stacking, signal is increasing, can finally generate stable oscillator signal.Oscillator signal is increasing to be will cause
The non-linear of loop is more and more obvious, and compression is realized in divided ring gain, and when gain is compressed into 1, oscillation signal power no longer increases
Add, final realize stablizes output.
If the Output optical power of electro-optic intensity modulator is
α is the Insertion Loss coefficient of electro-optic intensity modulator, and π is pi constant, and η decides the delustring of electro-optic intensity modulator
Than ξ=(1+ η)/(1- η), VDCFor electro-optic intensity modulator bias voltage, VπFor the half-wave voltage of electro-optic intensity modulator, VinFor
Input electrical signal, PinWith PoutRespectively input, Output optical power.Detector output electric signal by filtering, amplification, into
Expression formula is before entering electro-optic intensity modulator
ρ is the responsiveness of detector in above formula, and R is the matching impedance of detector output end, and τ is the delay of loop, GAFor
The amplitude gain of electric amplifier.Defining open-loop gain is
Its value must be greater than 1 cycle signal could starting of oscillation.Enabling η is 1, input signal Vin=V0Sin ω t, by above formula Taylor
Expansion, reservation to quadravalence are
When loop gain is 1, system reaches stable, generates and stablizes output signal, at this time
|G(V0) |=1
Solving output signal amplitude is
Hunting power PoscFor
In summary two formulas can be obtained the stabilization output power of electric oscillation signal and be
G(V0) it is not only V0Function and frequency function.It introduces phase factor F (ω), ssystem transfer function is repaired
Just it is
Vout=F (ω) G (V0)Vin
The corresponding final output signal of frequency point ω is after repeatedly recycling
For the additional phase shift of loop, for different resonance frequency points, value is different, is the function of frequency.
Above formula is converted into power expression
From the above equation, we can see that when resonance signal frequency meets
Corresponding frequency point emergent power peak value, the i.e. resonance peak of oscillator signal, two peak value sound intervals, that is, so-called free spectral limit
(Free Spectrum Range, FSR)
It is delayed for long optical fibers, generally hasThen output power single sideband phase noise is
ρNFor the power spectral density of noise, the Gaussian noise in ring mainly include thermal noise, laser relative intensity make an uproar
The Johnson noise of sound and detector, PoscFor hunting power.
Step 4 is based on the discrete equidistant spectrum cluster of two branches, chooses to the equidistant component of beat frequency.
The first photoelectricity mixing loop is mixed with the second photoelectricity respectively with optical narrow pass band filters 2 using optical narrow pass band filters 1
Two equidistant spectrum clusters of loop output carry out narrowband frequency-selecting, and carry out multiplex by photo-coupler 3.
If the laser signal for being input to two photoelectricity mixing loops is respectivelyWithWherein A1With A2Respectively two branch optical signal magnitude values, Ω1With Ω2For two branch optical signal frequencies,WithFor the corresponding phase of two branch optical signals.If adjusting photoelectricity mixing in-loop filter and amount of delay, so that circulation electricity
Signal is single-frequency point oscillator signal, respectivelyWithWherein a1With a2Respectively two follow
Ring electrical signal amplitude value, ω1With ω2For two circulation signal frequencies, θ1With θ2It is corresponding for two circulation electric signals
Phase.After spectrum is by expanding, it is based on amplitude modulation theory, upper and lower branch can be expressed asWithWhereinWithPoint
Coefficient Wei not be expanded, is not difficult to find out by above-mentioned two formula, after being expanded by spectrum, upper and lower two branch is showed with optical carrier frequency
Centered on discrete equidistant spectrum cluster.
Step 5 realizes spectrum beat frequency based on " square-law " detection, and output is realized after filtering.
Quadratic detection is carried out to input optical signal using photodetector, electric signal is restored, eventually by narrow-band filtering
Device realizes the output of microwave and millimeter wave signal.Specifically, quadratic detection is a kind of non-linear process, geophone output signal with
The instantaneous value of the oscillation envelope of input signal it is square approximate directly proportional.
Embodiment 1:
Involved method generates 20GHz microwave source referring to Fig.1, and measures to its phase noise.It is built based on Fig. 2 involved
Device basic structure.Use EM4 company model for the distributed feedback semiconductor of EM650-193500-100-PM900-FCA-NA
Laser (output power 100mW), the considerations of corresponding to low relative intensity noise in view of the high-power output of laser, experiment
In allow laser works under saturation output power, be followed by an adjustable optical attenuator change injection modulator end light function
Rate；Using Mach-increasing Dare type intensity modulator of the model IM-1550-12-PM of Optilab company；Using Optilab
The photodetector of the model PD-30 of company (highest corresponding frequencies are 30GHz)；Use Hittite company model for
The reactatron of HMC406；Use 6km SMF-28 telecommunication optical fiber as delay line；Other passive devices are all made of
Domestics.The double narrow band center wavelength of fiber grating are respectively that 1552.52nm and 1552.62nm (are divided into 0.1nm, lead in light
Letter C-band respective frequencies are 12.5GHz).
Step 1 generates homologous dual-wavelength laser.
" seed source " using broadband spectral source as dual-wavelength laser, using fiber grating pair, its broadband spectral is cut
It cuts, the central wavelength of dual-passband is respectively 1552.52nm and 1552.62nm, i.e., the dual wavelength finally realized after slice swashs
Radiant corresponding wavelength is respectively 1552.52nm and 1552.62nm.
Step 2, separation dual-wavelength laser, provide light source for two photoelectricity mixing loops.
Using meet ITU-T G.692 standard solution wavelength division multiplexer to dual wavelength single laser carry out branch, pass respectively
Give two branch photoelectricity mixing loops up and down.
Step 3 composes laser using photoelectricity mixing loop and realizes expansion, and discrete equidistant spectrum cluster is generated.
After light carrier passes through electro-optic intensity modulator, it is expanded by photoelectricity mixing loop rear class spectrum discrete etc.
Away from spectrum cluster, branch can be expressed as up and down as described aboveWithWherein two light carriers (corresponding central wavelength be 1552.52nm with
1552.62nm) corresponding spectral frequency is respectively Ω1=193.1THz and Ω2=193.0875THz.In two photoelectricity mixing loops
Setting narrow band filter central wavelength is 7.5GHz, if electric signal single-frequency in ring vibrates, ω1=ω2=7.5GHz.It is comprehensive
It is upper described, it after upper branch is expanded by spectrum, is formed centered on 193.1THz frequency, frequency spectrum spacing is discrete etc. for 7.5GHz's
Away from spectrum cluster；It after lower branch is expanded by spectrum, is formed centered on 193.0875THz frequency, frequency spectrum spacing is 7.5GHz's
Discrete equidistant spectrum cluster.
Step 4 is based on the discrete equidistant spectrum cluster of two branches, chooses to the equidistant component of beat frequency.
Using optical narrow pass band filters can constituency wait for the equidistant component of beat frequency.Scheme is expanded due to above-mentioned spectrum and is based on intensity tune
It makes, electrooptic modulator is in orthogonal working condition in implementation process, and power is largely focused on light carrier and first order signal component,
So being chosen when beat frequency spectrum using optical narrow pass band filters, as being selected object, the upper alternative frequency point spectral components of branch
IncludingWith(wherein Ω1=
193.1THz, ω1=7.5GHz)；Lower branch includes With(wherein Ω2=193.0875THz, ω2=7.5GHz).
Step 5 realizes spectrum beat frequency based on " square-law " detection, and output is realized after filtering.
" square-law " detection is carried out to input optical signal using photodetector, restores electric signal.
Further, it selects two single-frequency point spectrum to carry out beat frequency, is such as to beat signalWithAccording to " square-law " detection principle, output light electric current is directly proportional to light intensity, as
Abbreviation obtains:
Solution can obtain: Y ∝ { 1+cos [(Ω1-Ω2-ω2)t+(φ1-φ2-θ2)] (respective frequencies 5.0GHz).
Similarly, such as it is to beat signalWithSolution can obtain: Y ∝ { 1+cos [(Ω1-
Ω2)t+(φ1-φ2)] (respective frequencies 12.5GHz).
Similarly, such as it is to beat signalWithSolution can obtain:
Y∝{1+cos[(Ω1-Ω2+ω2)t+(φ1-φ2+θ2)] (respective frequencies 20.0GHz).
Similarly, such as it is to beat signalWithSolution can obtain:
Y∝{1+cos[(Ω1-Ω2+ω1)t+(φ1-φ2+θ1)] (respective frequencies 20.0GHz).
Similarly, such as it is to beat signalWithIt asks
Solution can obtain:
Y∝{1+cos[(Ω1-Ω2+ω1-ω2)t+(φ1-φ2+θ1-θ2)] (respective frequencies 12.5GHz).
Similarly, such as it is to beat signalWithSolution can
:
Y∝{1+cos[(Ω1-Ω2+ω1+ω2)t+(φ1-φ2+θ1+θ2)] (respective frequencies 27.5GHz).
Similarly, such as it is to beat signalWithSolution can obtain:
Y∝{1+cos[(Ω1-Ω2-ω1)t+(φ1-φ2-θ1)] (respective frequencies 5.0GHz).
Similarly, such as it is to beat signalWithIt asks
Solution can obtain:
Y∝{1+cos[(Ω1-Ω2-ω1-ω2)t+(φ1-φ2-θ1-θ2)] (respective frequencies 2.5GHz).
Similarly, such as it is to beat signalWithIt solves
It can obtain:
Y∝{1+cos[(Ω1-Ω2-ω1+ω2)t+(φ1-φ2-θ1+θ2)] (respective frequencies 12.5GHz).
Further, as described above, sharing nine if respectively selecting any one single-frequency point spectral components to carry out beat frequency from upper inferior division
A combination respectively obtains 2.5GHz, 5.0GHz, 12.5GHz, 20.0GHz and 27.5GHz and amounts to five single-frequency point telecommunications
Number.Embodiment is intended to generate 20.0GHz microwave signal, therefore optinal plan isWithOr selectionWithBeat frequency is carried out,
This experimental selectionWithCarry out beat frequency, the output microwave signal finally obtained
It is expressed as Y=2cos [(Ω1-Ω2+ω1)t/2+(φ1-φ2+θ1)/2]。
First, above formula fully demonstrates " Low phase noise " property that scheme involved by the present invention generates microwave and millimeter wave signal.By above formula
It is found that the phase of output signal is (φ1-φ2+θ1)/2, since the optical carrier source of upper and lower branch is in same light source, upper branch is road-load
Wave signal phase φ1With lower branch carrier signal phase φ2" disturbance " it is almost the same, therefore φ1-φ2Close to a fixed value, no
It can cause the power spectrum widening for exporting microwave signal phase；Photoelectricity mixing loop belongs to typical delay of feedback type oscillator, base
There is extremely low phase noise, θ in long optical fibers delay1Derived from circulation electrical signal phase, therefore final output microwave signal has pole
Low phase noise is (by θ1It determines).
Second, above formula fully demonstrates " full frequency-domain is tunable " property that scheme involved by the present invention generates microwave and millimeter wave signal.
From the above equation, we can see that the frequency of output signal is (Ω1-Ω2+ω1)/2, Ω1With Ω2Difference can pass through the light carrier of upper and lower branch
Wavelength be tuned, ω1Value is the frequency of photoelectricity mixing loop oscillation electric signal, can pass through narrow band filter in ring and delay
Amount size is tuned, and " the full frequency-domain of microwave and millimeter wave signal can be realized by the way of " area of light " and " electrical domain " collocation tuning
It is tunable " property.
Fig. 3 gives the power spectral density of microwave and millimeter wave output signal produced by the present embodiment, and it is micro- to realize 20.0GHz
The output of wave millimeter-wave signal, it was confirmed that the validity of the present embodiment.
The actual measurement that Fig. 4 gives microwave and millimeter wave output signal produced by the present embodiment is mutually made an uproar data, to embody the present invention
The advance of involved scheme, while the actual measurement for giving branch photoelectricity mixing loop oscillation electric signal (7.5GHz) is mutually made an uproar number
According to.It is not difficult to find out based on data in figure, the frequency of oscillator signal is not only increased to 20.0GHz from 7.5GHz by this programme, but also
It preferably reduces and mutually makes an uproar, close to 10dB is reduced near 10Hz, 20dB is reduced near 100Hz and 1kHz, so that defeated
Out signal mutually make an uproar index be improved significantly, i.e., the present invention involved by scheme generate microwave and millimeter wave signal source have high stable
Property.
In order to allow those of ordinary skill in the art more easily to understand the improvements of the present invention compared with the existing technology, this
Some attached drawings of invention and description have been simplified, and for the sake of clarity, present specification is omitted some other members
Element, the element that those of ordinary skill in the art should be aware that these are omitted also may make up the contents of the present invention.
Claims (5)
1. a kind of device for generating high stability microwave and millimeter wave source characterized by comprising
Homologous dual wavelength module, for generating homologous dual-wavelength laser and shunting it to the first photoelectricity mixing loop and the second light
Electricity mixing loop；The homologous dual wavelength module includes broadband spectral source, fiber grating and solution wavelength division multiplexer, the broadband light
Spectrum source provides broadband optical signal source, and the fiber grating has bimodal narrow-band filtering, for carrying out two-band to broadband spectral
Cutting, generates homologous dual-wavelength laser, and the solution wavelength division multiplexer connects the first photoelectricity mixing loop and the second photoelectricity mixing ring
The homologous dual-wavelength laser is simultaneously branched to the first photoelectricity mixing loop and the second photoelectricity mixing loop by road；
First photoelectricity mixing loop and the second photoelectricity mixing loop realize expansion for composing to laser, generate discrete equidistant spectrum
Cluster；The first photoelectricity mixing loop include electro-optic intensity modulator 1, photo-coupler 1, light delay unit 1, photodetector 1,
Electric narrow band filter 1 and electric amplifier 1；The second photoelectricity mixing loop include electro-optic intensity modulator 2, photoelectrical coupler 2,
Light delay unit 2, photodetector 2, electric narrow band filter 2 and electric amplifier 2, the electricity narrow band filter 1 and electric narrowband filter
2 corresponding matching light delay unit 1 of wave device and light delay unit 2 are used for frequency-selecting, the electro-optic intensity modulator 1 and electro-optic intensity tune
Device 2 processed is for realizing electro-optic conversion, and the photodetector 1 and photodetector 2 are for realizing photoelectric conversion, the optical coupling
Device 1 and photo-coupler 2 are shunted for optical signal, and the electric amplifier 1 and electric amplifier 2 are for the electro-optical transfer in compensation loop
With transition loss, the noise in the first photoelectricity mixing loop and the second photoelectricity mixing loop constantly realizes light inside loop
Electricity/electro-optic conversion and circulation, the electric signal for meeting Barkhausen criterion finally realizes oscillation, and exports at photo-coupler end, complete
The intensity modulated of pairs of light carrier, realizes the discrete equidistant expansion centered on carrier wave；
Optical narrow pass band filters 1 and optical narrow pass band filters 2 are respectively used to mix the first photoelectricity mixing loop and the second photoelectricity
The discrete equidistant spectrum cluster of loop carries out frequency-selecting；
Photo-coupler 3, for the discrete equidistant light chosen from the first photoelectricity mixing loop and the second photoelectricity mixing loop
It composes cluster and carries out multiplex；
Photodetector 3, for carrying out quadratic detection to the optical signal of input, completing photo-beat frequency and exporting microwave and millimeter wave letter
Number；
Electric narrow band filter 3 is used for frequency-selecting, inhibits to clutter, final to obtain target microwave and millimeter wave single frequency point signal；
Dual wavelength interval by adjusting the fiber grating can realize that area of light is adjusted to output signal, narrow by adjusting the electricity
Band filter 1 and the centre frequency and light delay unit 1 of 2 passband of electric narrow band filter and the amount of delay of light delay unit 2 are big
It is small to realize that electrical domain is adjusted to output signal, by the dual regulation of above-mentioned area of light and electrical domain, it can be achieved that the full range of output signal
Section covering and adjusting.
2. a kind of method for generating high stability microwave and millimeter wave source, which comprises the following steps:
Step 1 generates homologous dual-wavelength laser: using the mode transmission fiber grating pair broadband spectral with bimodal narrow-band filtering
The broadband spectral in source is cut, to obtain homologous dual-wavelength laser；
Step 2, separation dual-wavelength laser；
Step 3 composes laser and realizes expansion, generates the discrete equidistant spectrum cluster of Liang Ge branch: first using electro-optic intensity modulator
Amplitude modulation is carried out to isolated light carrier noise, the realization of light delay unit is entered after then shunting by photo-coupler and is prolonged
When, optical signal carries out quadratic detection by photodetector after delay, restores electric signal, and electric signal passes through electric narrow-band filtering again
Device carries out frequency-selecting, and realizes loss balancing by electric amplifier, is finally-transmitted to the electrical input of electro-optic intensity modulator, again
Light carrier is modulated and is recycled next time, stable oscillator signal is finally generated, oscillator signal is increasing to be caused
The non-linear of loop is more and more obvious, and compression is realized in divided ring gain, and when gain is compressed into 1, oscillation signal power no longer increases
Add, final realize stablizes output；
Step 4, the discrete equidistant spectrum cluster based on Liang Ge branch are chosen to the equidistant component of beat frequency；
Step 5 realizes spectrum beat frequency based on quadratic detection, and output is realized after filtering；
It can realize that area of light is adjusted to output signal by the dual wavelength interval of fiber grating described in regulating step 1, pass through adjusting
The centre frequency of the passband of electricity narrow band filter described in step 3 and the amount of delay size of light delay unit can be to output signal realities
Existing electrical domain is adjusted, by the dual regulation of above-mentioned area of light and electrical domain, it can be achieved that the full frequency band covering and adjusting of output signal.
3. the method according to claim 2 for generating high stability microwave and millimeter wave source, it is characterised in that:
Homologous dual wavelength single laser is separated using solution wavelength division multiplexer in step 2.
4. the method according to claim 2 for generating high stability microwave and millimeter wave source, it is characterised in that:
Narrowband frequency-selecting is carried out to the discrete equidistant spectrum cluster of two branches respectively using optical narrow pass band filters in step 4, and passes through light
Coupler carries out multiplex.
5. the method according to claim 2 for generating high stability microwave and millimeter wave source, it is characterised in that:
Quadratic detection is carried out to input optical signal using photodetector in step 5, electric signal is restored, is filtered eventually by narrowband
Wave device realizes the output of microwave and millimeter wave signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611030152.1A CN106356700B (en) | 2016-11-15 | 2016-11-15 | A kind of method and apparatus generating high stability microwave and millimeter wave source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611030152.1A CN106356700B (en) | 2016-11-15 | 2016-11-15 | A kind of method and apparatus generating high stability microwave and millimeter wave source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106356700A CN106356700A (en) | 2017-01-25 |
| CN106356700B true CN106356700B (en) | 2019-01-04 |
Family
ID=57863236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611030152.1A Expired - Fee Related CN106356700B (en) | 2016-11-15 | 2016-11-15 | A kind of method and apparatus generating high stability microwave and millimeter wave source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106356700B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429452B (en) * | 2019-07-25 | 2020-10-02 | 东南大学 | Double-ring broadband tunable optoelectronic oscillator |
| CN111147150B (en) * | 2019-12-18 | 2023-02-07 | 上海交通大学 | Distributed optical frequency transmission device and transmission method based on passive phase compensation |
| CN111427172A (en) * | 2020-04-09 | 2020-07-17 | 大连理工大学 | Microwave photon filter based on spectrum segmentation light source |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101188342A (en) * | 2007-11-08 | 2008-05-28 | 北京交通大学 | Transmission device generating micro-wave and mm wave by using linear cavity dual-wave optical fiber laser |
| CN101540469A (en) * | 2009-04-20 | 2009-09-23 | 浙江大学 | Optical generation method and devices of tunable high-frequency microwave signals |
| CN101572375A (en) * | 2009-04-30 | 2009-11-04 | 天津理工大学 | Device utilizing single longitudinal mode dual wavelength fibre laser to generate microwave and millimeter wave |
| CN102163795A (en) * | 2011-03-15 | 2011-08-24 | 中国科学院半导体研究所 | Optoelectronic oscillator with tunable broadband frequency |
| CN103460526A (en) * | 2010-11-29 | 2013-12-18 | Imra美国公司 | Frequency comb source with large comb spacing |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9905999B2 (en) * | 2015-02-26 | 2018-02-27 | California Institute Of Technology | Optical frequency divider based on an electro-optical-modulator frequency comb |
| CN104767102B (en) * | 2015-04-29 | 2018-02-27 | 湖南工学院 | Optical-electronic oscillator |
| CN105141373B (en) * | 2015-08-07 | 2017-11-14 | 南京邮电大学 | A kind of production method of ultra wideband multi-band section microwave signal |
| CN105629520B (en) * | 2016-01-18 | 2018-03-06 | 南京邮电大学 | A kind of wide and flat tunable optical frequency comb generation method |
-
2016
- 2016-11-15 CN CN201611030152.1A patent/CN106356700B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101188342A (en) * | 2007-11-08 | 2008-05-28 | 北京交通大学 | Transmission device generating micro-wave and mm wave by using linear cavity dual-wave optical fiber laser |
| CN101540469A (en) * | 2009-04-20 | 2009-09-23 | 浙江大学 | Optical generation method and devices of tunable high-frequency microwave signals |
| CN101572375A (en) * | 2009-04-30 | 2009-11-04 | 天津理工大学 | Device utilizing single longitudinal mode dual wavelength fibre laser to generate microwave and millimeter wave |
| CN103460526A (en) * | 2010-11-29 | 2013-12-18 | Imra美国公司 | Frequency comb source with large comb spacing |
| CN102163795A (en) * | 2011-03-15 | 2011-08-24 | 中国科学院半导体研究所 | Optoelectronic oscillator with tunable broadband frequency |
Non-Patent Citations (1)
| Title |
|---|
| Broadband-Frequency-Tunable Sub-Terahertz Wave Generation Using an Optical Comb，AWGs，Optical Switches，and a Uni-Traveling Carrier Photodiode for Spectroscopic Applications;Ho-Jin Song;《JOURNAL OF LIGHTWAVE TECHNOLOGY》;20080831;第26卷(第15期);第1-2节，图3-7 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106356700A (en) | 2017-01-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10659162B2 (en) | Photonic microwave down-conversion system and method | |
| Qi et al. | Optical generation and distribution of continuously tunable millimeter-wave signals using an optical phase modulator | |
| CN104022830B (en) | Device for generating eight frequency multiplication millimeter waves by utilizing Mach-Zehnder modulator | |
| Zhu et al. | Tunable frequency-quadrupling dual-loop optoelectronic oscillator | |
| CN108712213B (en) | Microwave three/two divided-frequency method and device based on optoelectronic oscillation loop | |
| CN103166706A (en) | Tunable-frequency photoelectric oscillation device based on wide spectrum light source | |
| CN106356700B (en) | A kind of method and apparatus generating high stability microwave and millimeter wave source | |
| CN108964779B (en) | Channelized receiving method and device based on the vibration of frequency spectrum intertexture trimmed book | |
| CN113055093B (en) | Tunable microwave photon filter with ultrahigh Q value | |
| CN111082872B (en) | Fourier domain mode-locked photoelectric oscillator based on electronic control frequency sweep and implementation method | |
| CN107123919B (en) | Optical signal processing method and the optical-electronic oscillator directly demodulated based on phase-modulation- | |
| Járó et al. | A new high-efficiency optical-microwave mixing approach | |
| Shams et al. | Optical frequency tuning for coherent THz wireless signals | |
| Malacarne et al. | Reconfigurable low phase noise RF carrier generation up to W-band in silicon photonics technology | |
| CN112448771A (en) | Microwave photon broadband receiver | |
| CN116054951B (en) | Oscillator based on intermediate frequency mode selection and optical signal modulation and oscillating method | |
| CN105896236B (en) | Double long ring structure reactive filter wideband adjustable optical-electronic oscillators | |
| CN113900282B (en) | Silicon-based integrated broadband high-speed tunable microwave photon phase shifter chip | |
| CN102324983B (en) | Michelson interferometer-based optical domain multi-wavelength signal generation system | |
| CN104051934A (en) | Optoelectronic oscillator and method based on electrical loop filtering | |
| CN104051933B (en) | Tunable optoelectronic oscillator and method based on electric self-oscillation loop | |
| JP2008228206A (en) | Optical angle modulator | |
| CN105490135B (en) | A kind of millimeter-wave frequency generation device | |
| Tseng et al. | All-optical sub-THz signal generation using two mutually coupled semiconductor lasers | |
| CN110912537B (en) | OEO-based frequency-adjustable ultralow-time-jitter arbitrary waveform generator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190104 |