CN106936511B - It is a kind of to realize that microwave signal mirror image inhibits the device of mixing using Photonics Technology - Google Patents
It is a kind of to realize that microwave signal mirror image inhibits the device of mixing using Photonics Technology Download PDFInfo
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- CN106936511B CN106936511B CN201710120650.3A CN201710120650A CN106936511B CN 106936511 B CN106936511 B CN 106936511B CN 201710120650 A CN201710120650 A CN 201710120650A CN 106936511 B CN106936511 B CN 106936511B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/614—Coherent receivers comprising one or more polarization beam splitters, e.g. polarization multiplexed [PolMux] X-PSK coherent receivers, polarization diversity heterodyne coherent receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/615—Arrangements affecting the optical part of the receiver
- H04B10/6151—Arrangements affecting the optical part of the receiver comprising a polarization controller at the receiver's input stage
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6162—Compensation of polarization related effects, e.g., PMD, PDL
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6166—Polarisation demultiplexing, tracking or alignment of orthogonal polarisation components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
- H04B10/6971—Arrangements for reducing noise and distortion using equalisation
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- Engineering & Computer Science (AREA)
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
Realize that microwave signal mirror image inhibits the device of mixing using Photonics Technology the invention discloses a kind of, which is related to microwave technical field and technical field of photo communication.The method is as shown in the picture, including laser, palarization multiplexing horse once 90 degree of modulator (PDM-MZM), erbium-doped fiber amplifier (EDFA), optical band pass filter, optical splitter, Polarization Controller, polarization beam apparatus, photoelectricity balanced detector and low frequency couplers.The present invention is modulated using PDM-MZM to wide-band microwave radiofrequency signal and microwave local signal and palarization multiplexing, power etc. divides two-way after light filtering, every road is utilized respectively Polarization Controller and the polarizer adjusts the phase and amplitude relationship of palarization multiplexing light, by respectively obtaining the road I and the road Q intermediate-freuqncy signal after photodetection, signal is coupled finally by 90 degree of couplers of low frequency.The present invention realizes that the mirror image of wide-band microwave signal inhibits mixing in area of light, overcomes the rate limit of traditional electrical domain processing technique, has many advantages, such as that big bandwidth, high inhibition be simpler than, structure, electromagnetism interference.
Description
Technical field
The present invention relates to microwave technical fields and technical field of photo communication, more particularly to one kind to pass through Photonics Technology and realize
Microwave signal mirror image inhibits the device of mixing.
Background technique
In existing microwave signal receiver, frequency mixer is essential component part, it can be received by antenna
High frequency radio signals down-convert to the intermediate-freuqncy signal of low frequency, recycle existing microwave device, handle intermediate-freuqncy signal.But
In complicated Electronic Warfare Environment, often there is image signal, and the signal after image signal down coversion and need
Intermediate-freuqncy signal has identical frequency, therefore the presence of image signal may result in receiver can not be successfully received needs
Intermediate-freuqncy signal.
Image-reject mixer can solve this problem very well, complete while it can inhibit image signal
At the mixing of microwave signal.To which unsuccessful demodulation goes out intermediate-freuqncy signal.But the current general bandwidth of electrical domain image-reject mixer
Smaller, image rejection ratio is low, it is difficult to meet the needs of Future broadband communication.
With the development of microwave photon technology, more and more researchers take up to realize using microwave photon technology
The mirror image of microwave signal inhibits mixing, and the microwave mirror compared to electrical domain inhibits mixing device, the frequency mixer based on microwave photon
There are higher bandwidth, smaller weight and volume, meanwhile, electromagnetism interference performance is good.
Summary of the invention
Based on microwave photon technology, realize that microwave signal mirror image inhibits mixed using Photonics Technology the invention proposes a kind of
The device of frequency.High-frequency microwave radiofrequency signal direct orthogonalization can be down-converted to the orthogonal intermediate-freuqncy signal of two-way by the present apparatus, then be tied
90 degree of couplers of low frequency of electrical domain are closed, it can be achieved that the down coversion that the mirror image of microwave signal inhibits.This method only includes an electrical domain
90 degree of couplers of low frequency, the electric power splitter and electric phase shifter, system bandwidth for not needing high frequency be no longer limited by the device of electrical domain,
Therefore it has very high bandwidth of operation.Further, since the modulation system of the suppressed carrier used, it is suppressed that occupy most of light function
Rate does not carry the light carrier of any information but, and the gain of system is higher.In combination with balanced detector, the gain of system is available
It further increases.It is a series of excellent that the device also possesses the distinctive big bandwidth of Photonics Technology, electromagnetism interference, light and flexible etc.
Point.
The technical scheme adopted by the invention is that: described device include laser, palarization multiplexing modulator (PDM-MZM),
Erbium-doped fiber amplifier (EDFA), optical band pass filter, optical splitter, Polarization Controller, polarization beam apparatus, photoelectricity balance detection
90 degree of couplers of device and low frequency.The input terminal of the delivery outlet connection PDM-MZM of laser；The output end of PDM-MZM connects EDFA
Input terminal；The output end of EDFA is connected with optical band pass filter input terminal；The output end and optical splitter of optical band pass filter
It is connected；Optical signal is divided into two-way up and down by optical splitter, and every road is separately connected Polarization Controller, polarization beam apparatus and photoelectricity balance
Detector；The output of upper and lower photoelectricity balanced detector is separately connected two input terminals of 90 degree of couplers.
The PDM-MZM increases modulator (MZM) by two horses of a Y type optical splitter, parallel connection up and down and one inclined
Vibration bundling device (PBC) is constituted.
The present invention at work the following steps are included:
(1) the continuous light carrier that wavelength is λ is issued from laser to be injected into PDM-MZM；
(2) the one of horse of wide-band microwave radiofrequency signal connection PDM-MZM increases the rf inputs of modulator, microwave local oscillation
Signal connects the rf inputs that another horse increases modulator, and upper and lower two sub- modulators work in smallest point, radio frequency and
Local oscillation signal carries out carrier-suppressed double sideband modulation to light carrier respectively.
(3) the modulated optical signal of upper and lower two-way is complex as palarization multiplexing light, output modulation by the PBC inside PDM-MZM
Device.
(4) palarization multiplexing optical signal enters EDFA progress power amplification.
(5) amplified optical signal enters optical band pass filter, filters out an optical sideband of radiofrequency signal and local oscillation signal,
Leave behind their another optical sideband.
(6) filtered optical signal enters optical splitter and is divided into the equal two-way up and down of power, and every road is respectively by polarization
Controller and polarization beam apparatus.Modulator main shaft and polarization beam apparatus main shaft is set there are 45 degree of angles by adjusting Polarization Controller,
Simultaneously Polarization Controller also in adjustable each palarization multiplexing optical signal two polarization states phase difference, polarization beam apparatus it is defeated
Outlet connects the input terminal of photoelectricity balanced detector, optical signal middle width strip radio frequency signal component and the mutual beat frequency of local oscillator component, obtains
To two-way intermediate-freuqncy signal.
(7) phase relation of radio frequency signal component Yu local oscillator component is adjusted by adjusting Polarization Controller: upper Lu Xiangwei
Difference is 0 degree, and lower road phase difference is 90 degree, obtains orthogonal intermediate-freuqncy signal.
(8) orthogonal intermediate-freuqncy signal is coupled again by 90 degree of couplers, obtains intermediate frequency only comprising useful signal
Signal.
It realizes that microwave signal mirror image inhibits the device of mixing by photonics method the invention proposes one, utilizes PDM-
MZM realizes the carrier-suppressed double sideband modulation of broadband rf signal and local oscillation signal and palarization multiplexing, optical band pass filter filter
Function divides two-way after a sideband out, by adjusting the Polarization Controller and polarization beam apparatus on every road, will wherein all the way in radio frequency letter
Number and the adjusting offset of local oscillation signal be 0 degree, another way radiofrequency signal and local oscillation signal phase difference are adjusted to 90 degree, Photoelectric Detection
The orthogonal intermediate-freuqncy signal of IQ two-way is respectively obtained after device beat frequency, then intermediate-freuqncy signal is coupled by 90 degree of couplers of electrical domain.
After 90 degree of couplers, image signal can cancel out each other, and the signal needed can be overlapped mutually.The configuration of the present invention is simple, tool
There is very strong operability.
Broadband rf signal is once down-converted to intermediate frequency by this programme, avoids multistage frequency conversion and filtering, and structure is simple, nothing
The interference of image frequency component, while also reducing the requirement to the bandwidth and sample rate of analog-digital converter.
Since the phase difference of radiofrequency signal and local oscillation signal can be continuously adjusted by Polarization Controller in the program, every road
The power of optical signal also can conveniently adjust, unrelated with signal bandwidth, carrier wave, so solving the problems, such as that IQ two-way is unbalanced.
Detailed description of the invention
Fig. 1 is the schematic diagram that the present invention realizes the inhibition mixing of microwave signal mirror image using Photonics Technology.Fig. 2 is light filtering
The frequency response chart of front and back spectrogram and optical band pass filter.Fig. 3 is the image rejection ratio and useful signal and mirror of system
As the waveform of signal.
Embodiment and specific operating process
Elaborate with reference to the accompanying drawing to the embodiment of the present invention: the present embodiment before being with technical solution of the present invention
It puts and is implemented, give the detailed schematic diagram for inhibiting mixing with radiofrequency signal mirror image, but protection scope of the present invention is not
It is limited to following embodiments.Wherein PDM-MZM or more two-way respectively has a horse to increase modulator, respectively to radiofrequency signal and microwave sheet
Vibration carries out carrier-suppressed double sideband modulation, then by the polarization beam combiner of the rear end PDM-MZM by two-beam palarization multiplexing.By
After EDFA amplification, bandpass filter filters out a sideband of modulated signal.After function divides two-way, one polarization is set on every road respectively
Controller, polarization beam apparatus and photoelectricity balanced detector.Polarization Controller combination polarization beam apparatus, adjustable palarization multiplexing light
The phase and amplitude relationship of two polarization states to just obtain I/Q signal after photoelectric detector beat frequency, then passes through electrical domain low frequency
90 degree of couplers couple orthogonal intermediate-freuqncy signal.
As shown in Figure 1, in this example, device includes: that laser, two radio-frequency signal sources, PDM-MZM, EDFA, light belt are logical
Filter, optical splitter, two Polarization Controllers, two polarization beam apparatus and two photoelectricity balanced detectors and electrical domain
90 degree of couplers of low frequency.The delivery outlet of laser is connected with the optical input of palarization multiplexing modulator, and two radio-frequency signal sources are defeated
Outlet is connected with two rf input ports of modulator respectively, and modulator is followed by EDFA, optical band pass filter and optical splitter, so
Each optical path is sequentially connected Polarization Controller, polarization beam apparatus and photoelectricity balanced detector respectively afterwards, finally connects 90 degree of low frequency
Coupler.
In this example, the specific implementation step of method is:
Step 1: laser generate operation wavelength be 1552nm, the continuous light wave that power is 15dBm, be injected into PDM-
MZM.The radiofrequency signal that one radio frequency source generates centre frequency 40GHz, power is -5dBm, another radio frequency source generate centre frequency
39.5GHz, the local oscillation signal that power is 10dBm are respectively intended to two horses that driving half-wave voltage is 3.5V and increase modulator.
Step 2: modulator Dc bias is controlled by substrate bias controller (MBC), so that two sub- modulators work
Smallest point.
Step 3: EDFA Output optical power is 18dBm, and optical signal passes through optical band pass filter after being amplified, filters out modulated
The positive single order sideband (or negative one rank sideband) of signal.
Step 4: optical band pass filter output signal two-way is divided by an optical splitter power, often all the way according to
Secondary connection Polarization Controller, polarization beam apparatus and photoelectricity balanced detector.As seen from Figure 2, after optical band pass filter,
Remaining spectral components are mainly positive 1 rank optical sideband, and other components are relatively low.Step 5: road polarization state makes to modulate in adjusting
Device and polarization beam apparatus main shaft angle are 45 degree, and two polarized component phase differences are 0 degree, by obtaining after photoelectricity balanced detector
The road I intermediate-freuqncy signal.Adjusting lower road polarization state makes 45 degree of modulator and polarization beam apparatus main shaft angle, two polarized component phases
Difference is 90 degree, by obtaining the road Q intermediate-freuqncy signal after photoelectricity balanced detector.
Step 6: the road I intermediate-freuqncy signal is sent into oscillography after 90 degree of coupler couplings of low frequency that the road Q intermediate-freuqncy signal passes through electrical domain
Device and frequency spectrograph are observed.As seen from Figure 3, after 90 degree of couplers of low frequency, image signal has obtained effective suppression
System, image rejection ratio are up to 50dB.The intermediate-freuqncy signal needed can maintain biggish amplitude, and the amplitude of image signal is almost
Zero.
In this example, the power and phase balance of IQ intermediate-freuqncy signal can be by adjusting the Polarization Controller in two-way
It is calibrated.
To sum up, the present invention inhibits mixing using the mirror image that PDM-MZM realizes wide-band microwave radiofrequency signal, and structure is simply easy
It in realization, is not influenced by electronic bottleneck, not by electromagnetic interference, system performance is good and stablizes.
In short, embodiments described above is only the embodiment of the present invention, not it is only used for limiting guarantor of the invention
Protect range, it is noted that for those skilled in the art, can be in present disclosure
Several equivalent variations and replacement are made, radiofrequency signal centre frequency, character rate are all changeable.These equivalent variations and replacement with
And the adjustment of frequency range also should be regarded as the scope of protection of the invention.
Claims (1)
1. a kind of realize that microwave signal mirror image inhibits the device of mixing, including laser, palarization multiplexing tune using Photonics Technology
Device PDM-MZM processed, erbium-doped optical fiber amplifier EDFA, optical band pass filter, optical splitter, Polarization Controller, polarization beam apparatus, light
90 degree of couplers of electric equilibrium detector and low frequency；It is characterized by: the laser output connects PDM-MZM, the PDM-
MZM output end connects EDFA input terminal, and the EDFA output end connects optical band pass filter input terminal, the optical band pass filter
Output end connects optical splitter, and the two-way up and down of optical splitter is separately connected Polarization Controller, polarization beam apparatus and photoelectricity balance
Detector, the photoelectricity balance detector output end of upper and lower two-way are separately connected two input terminals of 90 degree of couplers of low frequency；
The PDM-MZM is by a Y type splitter, parallel two horses increase modulator X-Pol MZM, Y-Pol MZM up and down, and one
A polarization beam combiner is constituted；The light carrier of input PDM-MZM is divided into the equal two-way of power after Y type splitter, wherein on
Road input, which starts, increases modulator X-Pol MZM to microwave radio signal RF progress carrier-suppressed double sideband modulation, under lower road input
Horse increases modulator Y-Pol MZM and carries out carrier-suppressed double sideband modulation to local oscillation signal LO, is then formed by polarization beam combiner
One palarization multiplexing light, the optical signal include the vertical radio frequency signal component and local oscillation signal component of polarization state；
The optical band pass filter is used to filter out one of optical sideband of palarization multiplexing light microwave radio signal and local oscillation signal；
The splitter is used to the optical sideband filtered out being divided into the equal two-way up and down of power；
The Polarization Controller be used to adjust after polarization beam apparatus in optical signal radiofrequency signal and the phase of local oscillation signal component and
Amplitude relation, there are one 90 degree of phase differences for the intermediate-freuqncy signal after making upper and lower two-way photoelectricity balanced detector；
90 degree of couplers of the low frequency couple the intermediate-freuqncy signal of upper and lower two-way；
Described realizes that microwave signal mirror image inhibits the device of mixing that can realize that microwave is believed by adjusting PC using Photonics Technology
Number mixing while inhibit image signal interference.
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| CN107231160B (en) * | 2017-07-10 | 2019-06-07 | 南京航空航天大学 | Microwave photon image frequency inhibits frequency mixing method and device |
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| CN110808787B (en) * | 2019-10-14 | 2022-04-05 | 华东师范大学 | All-optical image frequency suppression frequency mixing device and method |
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| CN110912614B (en) * | 2019-11-29 | 2022-10-11 | 中国电子科技集团公司第四十四研究所 | Microwave photon mixer with image frequency suppression function |
| CN111555813B (en) * | 2020-05-21 | 2022-03-08 | 西南石油大学 | Device and method for realizing transmitting frequency diversity array based on microwave photon frequency conversion |
| CN111614405A (en) * | 2020-05-25 | 2020-09-01 | 济南浪潮高新科技投资发展有限公司 | Image rejection mixer based on double parallel phase modulators |
| CN111982167B (en) * | 2020-07-22 | 2021-06-22 | 北京邮电大学 | Device and method for inhibiting nonlinear damage in RoF system |
| CN114826428B (en) * | 2022-03-03 | 2023-11-21 | 北京邮电大学 | Image-suppressed down-conversion linearization microwave photon link system |
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