CN108459422A - A kind of dual-passband tunable microwave photon filter - Google Patents
A kind of dual-passband tunable microwave photon filter Download PDFInfo
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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Abstract
The present invention proposes a kind of dual-passband tunable microwave photon filter, including the first tunable laser, the first Polarization Controller, the second tunable laser, the second Polarization Controller, the first photo-coupler, third Polarization Controller, electrooptic modulator, optical circulator, fabry perot laser and photodetector.Using two main lasers and one from laser, a double-passband filter is realized by injection locking principle, it is simple and compact for structure；Using two tunable laser as two main lasers, fabry perot laser is used as from laser, the centre frequency of MPF can be adjusted by adjusting the injecting power of two main lasers, also the centre frequency of MPF can be adjusted by adjusting the off-resonance frequency between principal and subordinate's laser, also the centre frequency of MPF can be adjusted by adjusting the bias current from laser, the tunability of MPF proposed by the present invention is good.
Description
Technical field
The invention belongs to microwave photon filter technical field, especially a kind of dual-passband narrow-band tunable microwave photon filter
Wave device.
Background technology
Microwave is filtered in area of light and frequency-selecting processing is one of important research field therein, becomes heat in recent years
Point studies a question.Photonic device integrated system for being filtered to microwave signal and frequency-selecting is handled is referred to as microwave photon filter
Wave device (MPF), basic skills is to first pass through electro-optic conversion (E/O) microwave signal is converted into light load microwave signal, then in light
The photonic devices such as domain optical-fibre delay line, fiber grating, image intensifer carry microwave signal to light and handle, finally by photoelectricity
It converts (O/E) and directly exports target microwave signal.Relative to the electronic circuit processing method that tradition is realized with circuit board, MPF
In addition to have the advantages that small fibre loss, light-weight, wide bandwidth and electromagnetism interference it is natural other than, also have restructural and broadband can
Tuning capability, this be conditional electronic method it is incomparable.Therefore, MPF has a wide range of applications in various fields, such as can
To realize ring cavity frequency-selecting in OEO, channel selection and channel filtering are realized in RoF systems, wave is realized in celestial radio
Section selection realizes that clutter is eliminated in the radar system of mobile target identification.
Initial MPF is all based on the realization of multi-tap time delay cable architecture, and wherein light source can be multiple single wavelength light sources,
It can also be single multi wave length illuminating source.Line of time delay can be single mode optical fiber, dispersion compensating fiber, fiber grating, Waveguide array etc..
The mathematical model of this filter can be expressed as
Wherein k is integer, and x (t) is input signal, and y (t) is output signal, akFor tap coefficient, T is two neighboring pumping
Delay inequality between head.Its frequency-domain expression, which can be obtained, to (1) formula progress Fourier transformation is：
Band logical MPF in order to obtain, researcher propose various schemes and realize negative tap coefficient, such as Differential Detection method, profit
With the method for the cross-gain modulation characteristic of semiconductor optical amplifier, the method based on Injection Locking Semiconductor Lasers utilizes
The method of two modulation of polarization direction complementations of light polarization modulator, utilizes the method etc. of the reverse phase modulating characteristic of intensity modulator.This
A little schemes realize the bandpass characteristics of filter, but tuning performance is poor, can also cause the spectral aliasing in each channel, re-configurability
Also poor.
Invention content
The purpose of the present invention is to propose to a kind of good dual-passband microwave photon filters of tuning performance.
The specific technical solution that the present invention uses is as follows：A kind of dual-passband tunable microwave photon filter, including first
Tunable laser, the first Polarization Controller, the second tunable laser, the second Polarization Controller, the first photo-coupler, third
Polarization Controller, electrooptic modulator, optical circulator, fabry-Perot type laser and photodetector；
The output end of first tunable laser connects the input terminal of the first Polarization Controller, the first Polarization Controller it is defeated
Outlet connects the input terminal of the first photo-coupler, and the output end of the second tunable laser connects the input of the second Polarization Controller
End, the output end of the second Polarization Controller connect the input terminal of the first photo-coupler, the output end connection of the first photo-coupler the
The input terminal of three Polarization Controllers, the input terminal of the output end connection electrooptic modulator of third Polarization Controller, electrooptic modulator
Output end connection optical circulator first port, the second port of optical circulator connects fabry-Perot type laser, ring of light row
The third port of device connects photodetector.
As a further improvement on the present invention, the optical wavelength of the first tunable laser transmitting is more than Fabry-Perot
The optical wavelength of the center dominant wavelength of laser, the transmitting of the second tunable laser is less than the center of fabry-Perot type laser
Dominant wavelength.
As a further improvement on the present invention, the optical wavelength with Fabry-Perot of the first tunable laser transmitting swash
The difference of the center dominant wavelength of light device is less than the center dominant wavelength of fabry-Perot type laser and the second tunable laser emits
Optical wavelength difference.
As a further improvement on the present invention, the center dominant wavelength of fabry-Perot type laser is 1561.5nm, method cloth
In-the threshold current I of Perot LaserbValue is 25.14mA, and R is compared in the first injection1Value is 18.09, and R is compared in the second injection2It takes
Value is 34.38, the optical wavelength λ of the first tunable laser transmitting1Value is 1562.704nm, the second tunable laser hair
The optical wavelength λ penetrated2Value is 1549.272nm, the first longitudinal-mode wavelength λ of fabry-Perot type laser1' value is
1562.856nm the second longitudinal-mode wavelength λ of fabry-Perot type laser2' value be 1549.372nm.
Beneficial effects of the present invention：The present invention, from laser, original is locked by injecting using two main lasers and one
Reason realizes a double-passband filter, and the steady-state light that two main lasers generate is coupled by coupler, then passes through photoelectricity tune
The upper microwave signal of device load processed, is injected into from laser by optical circulator, restores optical signal using photodetector
At electric signal, filtered microwave signal is exported, it is simple and compact for structure；Using two tunable laser as two main lasers
Device, Fabry-Perot (F-P) laser are used as from laser, can be adjusted by adjusting the injecting power of two main lasers
The centre frequency of MPF also can adjust the centre frequency of MPF by adjusting the off-resonance frequency between principal and subordinate's laser, can also pass through
The bias current from laser is adjusted to adjust the centre frequency of MPF, the tunability of MPF is good.
Description of the drawings
Fig. 1 is the structural schematic diagram of dual-passband tunable microwave photon filter proposed by the present invention.
Fig. 2 is the spectrogram of the dual-passband tunable microwave photon filter obtained using spectroanalysis instrument measurement.
Fig. 3 is the spectral composition figure of the first passband in Fig. 2.
Fig. 4 is the spectral composition figure of the second passband in Fig. 2.
Fig. 5 is the filtering characteristic of the dual-passband tunable microwave photon filter obtained using vector network analyzer measurement
Curve graph.
Fig. 6 is the filtering curve figure of the first passband in Fig. 5.
Fig. 7 is the filtering curve figure of the second passband in Fig. 5.
Fig. 8 is the filtering curve for adjusting the dual-passband tunable microwave photon filter that the first off-resonance frequency obtains.
Fig. 9 is the filtering curve for adjusting the dual-passband tunable microwave photon filter that the second off-resonance frequency obtains.
Figure 10 is to adjust filtering curve of first injection than the dual-passband tunable microwave photon filter of acquisition.
Figure 11 is to adjust filtering curve of second injection than the dual-passband tunable microwave photon filter of acquisition.
Figure 12 is the dual-passband tunable microwave photon filter for adjusting the threshold current of fabry-Perot type laser and obtaining
Filtering curve.
Figure 13 is the filtering characteristic of the dual-passband tunable microwave photon filter under the centre frequency of different first passbands
Curve.
Figure 14 is that the centre frequency of the first passband and amplitude change over time figure.
Figure 15 is that the centre frequency of the second passband and amplitude change over time figure.
Specific implementation mode
With reference to specific embodiment, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate the present invention
Rather than limit the scope of the invention, after having read the present invention, various equivalences of the those skilled in the art to the present invention
The modification of form falls within the application range as defined in the appended claims.
The embodiment of the present invention provides a kind of dual-passband tunable microwave photon filter, as shown in Figure 1, adjustable including first
Humorous laser TLS1, the first Polarization Controller PC1, the second tunable laser TLS2, the second Polarization Controller PC2, the first light
Coupler OC, third Polarization Controller PC3, electrooptic modulator PM, optical circulator Circulator, fabry-Perot type laser
F-P and photoelectric detector PD.
The output end of first tunable laser TLS1 connects the input terminal of the first Polarization Controller PC1, the first polarization control
The output end of device PC1 processed connects the input terminal of the first photo-coupler OC, the output end connection of the second tunable laser TLS2 the
The input terminal of two Polarization Controller PC2, the output end of the second Polarization Controller PC2 connect the input terminal of the first photo-coupler OC,
The input terminal of the output end connection third Polarization Controller PC3 of first photo-coupler OC, the output end of third Polarization Controller PC3
Connect the input terminal of electrooptic modulator PM, the first end of the output end connection optical circulator Circulator of electrooptic modulator PM
Mouthful, the second port of optical circulator Circulator connects fabry-Perot type laser F-P, optical circulator Circulator's
Third port connects photoelectric detector PD.
Wherein input terminal of the electrooptic modulator as filter, for inputting microwave signal to be filtered, photodetector
As the output end of filter, filtered microwave signal is exported.It is tunable micro- using dual-passband provided in an embodiment of the present invention
When glistening light of waves subfilter is filtered, the first tunable laser and the second tunable laser respectively generate optical signal all the way, and two
The optical signal of road different wave length inputs electrooptic modulator after the coupling of the first photo-coupler, and electrooptic modulator modulates microwave signal
Into optical signal, modulated optical signal is inputted from the first port of optical circulator, and Fabry-Perot is input to through second port
In laser, the optical signal through fabry-Perot type laser reflection is inputted from the second port of optical circulator, then from optical circulator
Third port output, to input photodetector, photodetector converts optical signals into electric signal, and output is filtered
Microwave signal.Wherein the first Polarization Controller, the second Polarization Controller and third Polarization Controller, being respectively used to adjustment first can
Between tuned laser and the first photo-coupler, between the second tunable laser and the first photo-coupler and the first optical coupling
Polarization state relationship between device and electrooptic modulator.
Dual-passband tunable microwave photon filter provided in an embodiment of the present invention, using two main lasers and one from
Laser realizes a double-passband filter by injection locking principle.
Wherein the first main laser uses the first tunable laser, the second main laser to use the second tunable laser
Injection is adjusted from the optical wavelength of laser, injecting power and injected frequency in device.
Fabry-Perot (F-P) laser, F-P laser is used to there are many longitudinal modes, more longitudinal mode effects from laser
So that the light not instead of single wavelength of laser output, one group of wavelength, each group of wavelength have certain width, and adjacent wavelength
Between interval it is identical, by change F-P laser bias current can change distribution of the energy between different longitudinal modes, because
This F-P laser has restructural characteristic.The light of two main lasers injects F-P laser, can be locked to F-P laser respectively
On two longitudinal modes of device.It is reflected simultaneously in order to ensure to inject luminous energy, F-P laser is without isolator.
By taking a tunable laser as an example, tranmitting frequency ft, light source that electrooptic modulator emits the main laser
Signal carries out double-side band intensity modulated, in ftBoth sides generate symmetrical sideband (f respectively0, f1, f-1), that is, include one strong light carrier with
Two weak two level sidebands.When these sidebands are with ftWhen being injected into the intracavitary of F-P laser together, fall in gain spectral limit
Sideband f-1It will be amplified, obtained gain size is determined by the relative position of sideband and longitudinal mode.When -1 grade of sideband is amplified to one
After determining degree, F-P laser is locked, and longitudinal mode disappears.If the direct tune of data base-band signal is carried out to F-P laser at this time
System, then -1 grade of sideband of only locking longitudinal mode can be modulated, and carrier wave and+1 grade of sideband due to far from gain region and hardly by
It influences, to realize single sideband modulation.The power distribution and the gain at longitudinal mode of each frequency point after photodetector detects
Spectrum is unanimously to get to the single-pass of class gaussian-shape band MPF.
First tunable laser and the optical wavelength of the second tunable laser transmitting are respectively in F-P laser
The both sides of heart dominant wavelength, therefore it can be respectively formed single-pass band MPF in corresponding position, synthesize a dual-passband MPF.The present invention is implemented
In example, the center dominant wavelength of F-P laser is 1561.5nm, longitudinal mode spacing 1.34nm, but dominant wavelength both sides are not stringent right
Claim, short wavelength side power with wavelength reduce and reduce trend it is slower, long wavelength side power with wavelength increase and reduce become
Gesture is more rapidly.Therefore, it to keep the luminous power that two main lasers inject F-P laser essentially identical, needs to emit short-wavelength light
The wavelength value of the main laser of wave differs bigger, the i.e. optical wavelength and method of the first tunable laser transmitting with center dominant wavelength
The difference of the center dominant wavelength of Fabry-Perot-type laser is adjustable less than the center dominant wavelength of fabry-Perot type laser and second
The difference of the optical wavelength of humorous laser transmitting.Before injecting F-P laser, it can be carried out by light power meter or spectrometer rough
It measures, the optical signal power to ensure the injection of two-way main laser is suitable.
For the performance of observation filter device, the second photo-coupler is connected between optical circulator and photodetector, specifically
, the third port of optical circulator connects the input terminal of the second photo-coupler, the output end connection spectrum point of the second photo-coupler
Analyzer, the waveform of the optical signal for monitoring F-P laser output, the output end of the second photo-coupler connect photodetector,
The output end connected vector Network Analyzer of photodetector, the frequency response for detecting MPF.
Dual-passband MPF spectrograms as shown in Figure 2 can be obtained by spectroanalysis instrument, the first passband is located at the second passband
The right, Fig. 3 be Fig. 2 in the first passband spectral composition figure, it can be seen from the figure that the first main laser wavelength is
1564.19nm, power are -5.17dB, are 1564.30nm from the first longitudinal-mode wavelength of laser, and power is -4.82dB.Fig. 4 is figure
The spectral composition figure of second passband in 2, as can be seen from the figure the second main laser wavelength is 1549.35nm, power is-
4.33dB, is 1549.46nm from the second longitudinal-mode wavelength of laser, and power is -5.25dB.
Two main laser transmitting optical signals are injected into from laser, are generated respectively at two longitudinal modes from laser
The gain spectral of class Gaussian, the shape (shape of passband) of gain spectral is by the first off-resonance frequency Δ f1=ft1-fFP1, it is second detuning
Frequency Δ f2=ft2-fFP2, first injection ratioWith the second injection ratioIt codetermines, wherein ft1
For the tranmitting frequency of the first tunable laser, ft2For the tranmitting frequency of the second tunable laser, fFP1For F-P laser
The output frequency of first longitudinal mode, fFP2For the output frequency of the second longitudinal mode of F-P laser, P1It is noted for the first tunable laser
Enter the luminous power to F-P laser intra resonant cavity, P2It is injected into F-P laser intra resonant cavity for the second tunable laser
Luminous power, PFPFor F-P laser free oscillation when emergent power.
By the threshold current I for adjusting Polarization Controller, F-P laserb, the first off-resonance frequency Δ f1, the second off-resonance frequency
Δf2(or the optical wavelength λ of the first tunable laser transmitting1, the second tunable laser transmitting optical wavelength λ2、F-P
First longitudinal-mode wavelength λ of laser1' and the second longitudinal-mode wavelength λ2'), first injection compare R1And second injection compare R2, obtain not
With the dual-passband narrow band filter of performance.In the preferred embodiment of the present invention, work as Ib=25.14mA, R1=18.09, R2=34.38,
λ1=1562.704nm, λ2=1549.272nm, λ1'=1562.856nm, λ2When '=1549.372nm, dual-passband narrow-band filtering
Device can get superperformance, as shown in figure 5, for the dual-passband MPF filtering curve figures that vector network analyzer measurement obtains,
First passband is located at the right of the second passband, it can be seen from the figure that the Out-of-band rejection ratio of MPF is 23.8dB, as shown in fig. 6,
The three dB bandwidth of first passband is 615MHz, as shown in fig. 7, the three dB bandwidth of the second passband is 500MHz.
It can be by adjusting the first off-resonance frequency Δ f1, to adjust the centre frequency f of double-passband filterc1, as Δ f1Point
Other value 17.873GHz, 21.122GHz, 21.872GHz, 22.497GHz, 22.747GHz, 23.122GHz, 23.372GHz
When, the rule of presentation is as shown in figure 8, with Δ f1Increase, the three dB bandwidth of the first passband is gradually reduced, centre frequency fc1Gradually
Reduce, the frequency response curve of the second passband is basically unchanged.
It equally, can be by adjusting the second off-resonance frequency Δ f2, to adjust the centre frequency f of double-passband filterc2, work as Δ
f2Respectively value 11.792GHz, 16.214GHz, 16.706GHz, 17.197GHz, 18.671GHz, 19.162GHz,
When 20.145GHz, the rule of presentation is as shown in Figure 9：With Δ f2Increase, the three dB bandwidth of the second passband is gradually reduced, center frequency
Rate fc2It is gradually reduced, the frequency response curve of the first passband is basically unchanged.
Also it can compare R by adjusting the first injection1, to adjust double-passband filter the first passband centre frequency fc1,
Work as R1Value 33.44dB, 32.27dB, 32.07dB, 31.09dB, 30.42dB, 29.60dB, 28.89dB, 28.15dB respectively
When, the rule of presentation is as shown in Figure 10, with R1Reduce, the three dB bandwidth of the first passband is gradually reduced, centre frequency fc1Gradually increase
Greatly, the frequency response curve of the second passband is basically unchanged.
Equally, also it can compare R by adjusting the second injection2, to adjust double-passband filter the second passband center frequency
Rate fc2, work as R2Respectively value 28.26dB, 27.27dB, 26.27dB, 25.50dB, 24.58dB, 23.45dB, 22.82dB,
When 22.22dB, the rule of presentation is as shown in figure 11, with R2Reduce, the three dB bandwidth of the second passband is gradually reduced, centre frequency
fc2Gradually increase, the frequency response curve of the first passband is basically unchanged.
As the threshold current I of F-P laserbWhen changing to 28mA from 22mA, the rule of presentation is as shown in figure 12, and first is logical
The centre frequency f of bandc1With the centre frequency f of the second passbandc2It becomes larger, frequency response amplitude first increases and then decreases, compares
One passband and the second passband, with IbIncrease, the first passband response amplitude is first less than the second passband, then equal, finally
First passband response amplitude is more than the second passband response amplitude.
When adjusting other parameters make the centre frequency f of the first passbandc1When (2GHz) changes at equal intervals, as shown in figure 13,
The frequency response amplitude of first passband slightly declines, and tunable range 18GHz, the frequency response curve of the second passband is substantially not
Become.
The steadiness of the centre frequency and amplitude of MPF frequency response curves is measured, at interval of 5 minutes in 1 hour
It surveys once, as shown in figure 14, centre frequency and the amplitude variable quantity of the first passband are respectively 190MHz and 0.57dB, such as Figure 15 institutes
Show, centre frequency and the amplitude variable quantity of the second passband are respectively 57MHz and 0.29dB.
The dual-passband tunable microwave photon filter that the embodiment of the present invention proposes, using two main lasers and one from
Laser realizes a double-passband filter by injection locking principle, and the steady-state light that two main lasers generate passes through coupling
Clutch couples, then loads upper microwave signal by electrooptic modulator, is injected into from laser by optical circulator, using light
Optical signal is reduced into electric signal by electric explorer, exports filtered microwave signal, simple and compact for structure；It is tunable using two
As two main lasers, Fabry-Perot (F-P) laser is used as from laser laser, can be swashed by adjusting two masters
The injecting power of light device adjusts the centre frequency of MPF, also can adjust MPF by adjusting the off-resonance frequency between principal and subordinate laser
Centre frequency, can also adjust the centre frequency of MPF, MPF proposed by the present invention by adjusting bias current from laser
Tunability it is good.
Claims (4)
1. a kind of dual-passband tunable microwave photon filter, which is characterized in that including the first tunable laser, the first polarization
Controller, the second tunable laser, the second Polarization Controller, the first photo-coupler, third Polarization Controller, electro-optical modulation
Device, optical circulator, fabry-Perot type laser and photodetector；
The output end of first tunable laser connects the input terminal of the first Polarization Controller, the output end of the first Polarization Controller
The input terminal of the first photo-coupler is connected, the output end of the second tunable laser connects the input terminal of the second Polarization Controller,
The output end of second Polarization Controller connects the input terminal of the first photo-coupler, and the output end connection third of the first photo-coupler is inclined
Shake the input terminal of controller, the input terminal of the output end connection electrooptic modulator of third Polarization Controller, electrooptic modulator it is defeated
Outlet connects the first port of optical circulator, and the second port of optical circulator connects fabry-Perot type laser, optical circulator
Third port connects photodetector.
2. dual-passband tunable microwave photon filter according to claim 1, which is characterized in that the first tunable laser
The optical wavelength of device transmitting is more than the center dominant wavelength of fabry-Perot type laser, the light wave of the second tunable laser transmitting
Wavelength is less than the center dominant wavelength of fabry-Perot type laser.
3. dual-passband tunable microwave photon filter according to claim 2, which is characterized in that the first tunable laser
The difference of the optical wavelength of device transmitting and the center dominant wavelength of fabry-Perot type laser is less than fabry-Perot type laser
The difference of center dominant wavelength and the optical wavelength of the second tunable laser transmitting.
4. dual-passband tunable microwave photon filter according to claim 3, which is characterized in that Fabry-Perot swashs
The center dominant wavelength of light device is 1561.5nm, the threshold current I of fabry-Perot type laserbValue is 25.14mA, the first note
Enter to compare R1Value is 18.09, and R is compared in the second injection2Value is 34.38, the optical wavelength λ of the first tunable laser transmitting1Value
For 1562.704nm, the optical wavelength λ of the second tunable laser transmitting2Value is 1549.272nm, Fabry-Perot lasor
First longitudinal-mode wavelength λ of device1' value be 1562.856nm, the second longitudinal-mode wavelength λ of fabry-Perot type laser2' value is
1549.372nm。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110708123A (en) * | 2019-10-12 | 2020-01-17 | 苏州大学 | Semiconductor laser-based double-chirp microwave signal generation device and method |
| CN114614902A (en) * | 2022-03-08 | 2022-06-10 | 南京航空航天大学 | All-optical reconfigurable microwave signal generation method and device |
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