CN107528638A - Wide-band microwave Direction-of-arrival method based on microwave photon filtering - Google Patents
Wide-band microwave Direction-of-arrival method based on microwave photon filtering Download PDFInfo
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- CN107528638A CN107528638A CN201710655401.4A CN201710655401A CN107528638A CN 107528638 A CN107528638 A CN 107528638A CN 201710655401 A CN201710655401 A CN 201710655401A CN 107528638 A CN107528638 A CN 107528638A
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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
- H04B10/70—Photonic quantum communication
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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
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/67—Optical arrangements in the receiver
- H04B10/671—Optical arrangements in the receiver for controlling the input optical signal
- H04B10/675—Optical arrangements in the receiver for controlling the input optical signal for controlling the optical bandwidth of the input signal, e.g. spectral filtering
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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
- H04B10/691—Arrangements for optimizing the photodetector in the receiver
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Abstract
The invention discloses a kind of method of the wide-band microwave Direction-of-arrival based on microwave photon filtering, the invention is related to microwave technical field and technical field of photo communication, is mainly used in microwave photon signal transacting.Methods described as shown in drawings, including lasing light emitter, palarization multiplexing MZ Mach-Zehnder, polarization beam combiner, Polarization Controller, polarization beam apparatus, optical delay line and photodetector.The program utilizes palarization multiplexing MZ Mach-Zehnder, with reference to differential group delay module, constructs two-tap microwave photon filter, carries out notch filter to input electrical signal and observes result, so as to estimate wide-band microwave direction of arrival.The method of estimation is simple in construction simultaneously is easily achieved, cheap, is not influenceed by electronic bottleneck, can be worked under the conditions of incoherent, have the advantages that strong robustness.
Description
Technical field
The present invention relates to technical field of photo communication and microwave technical field, relates generally to be based on microwave light in optical communication technique
The method of the wide-band microwave Direction-of-arrival of son filtering.
Background technology
In the field such as radar system and electronic warfare, there is extensive demand to DOA estimate.However, by electronic bottleneck
Limitation, realize that the angle of arrival measurement to high band, big instant bandwidth microwave signal faces larger challenge using existing electronic technology.
In order to overcome the limitation of electronic bottleneck, electronic technology and photon technology are combined by Microwave photonics, are realized in area of light to micro-
Generation, transmission and the processing of ripple signal, it has the advantages that big bandwidth, electromagnetism interference, thus is increasingly becoming various countries' research heat
One of point.Wherein, the wide-band microwave signal measurement technique based on microwave photon have it is simple in construction be easily achieved, not by electronics bottle
The advantages that neck influences, and then paid attention to by research institution of various countries.
The general principle for being currently based on the microwave signal angle-of- arrival estimation of microwave photon is two single antenna lists of measurement
Phase shift or relative time-delay between the radiofrequency signal received at member.According to the difference of implementation, three are can be largely classified into
Kind：(1) microwave signal and its phase delay component received two antennas is loaded into two electrooptic modulators, by measuring light
The phase shift that carrier power obtains, so as to obtain angle of arrival；(2) double parallel Mach-increasing Dare modulator (DP-MZM) or double is used
The parallel light delay structure for driving MZM to form, by suppressing light carrier, optical sideband power is measured to obtain phase delay, so as to
Obtain angle of arrival；(3) a pair of microwave photon down conversion devices are based on, are prolonged by measuring the time between corresponding intermediate frequency (IF) signal
Time delay between belated acquisition microwave signal, obtain angle of arrival.
Method based on phase-detection is only used for pure tone signal, and during the method based on down coversion needs further
Frequency is handled.Therefore, this several method is limited to the disposal ability of big instant bandwidth signal.Burnt based on spectrum in spatial spectral material
Although the method for the effect of holes can handle broadband signal, need to run at low temperature.Arrival based on photon microwave filtering
Angular estimation system can obtain the time delay of broadband signal by measuring transmission trap.But its needs is worked with different wave length
Two lasing light emitters and a pair of intensity modulators, this will increase system complexity.
The content of the invention
In order to solve the technical problem in the presence of background technology, the present invention proposes a kind of based on microwave photon filtering
The method of wide-band microwave Direction-of-arrival.
The technical solution adopted in the present invention is：Described device includes lasing light emitter, palarization multiplexing Mach-Zehnder is modulated
Device, polarization beam combiner, Polarization Controller, polarization beam apparatus, optical delay line, adjustable optical attenuator, photodetector and electric signal
Analyzer；The output port of lasing light emitter is connected with palarization multiplexing Mach-Zehnder modulators input, the output end of the modulator
It is connected with Polarization Controller input port；The output port of Polarization Controller is connected with the input port of polarization beam apparatus；Polarization
Input port of the output port of beam splitter respectively with optical delay line and adjustable optical attenuator is connected；Optical delay line and adjustable light decay
The output port for subtracting device is connected with polarization beam combiner input port；The input of polarization beam combiner output port and photodetector
Mouth is connected, and the output port connection electric signal analyzer of photodetector carries out observation test.
The palarization multiplexing Mach-Zehnder modulators are modulated by the parallel Mach of Y shunts, upper and lower two-way-increasing Dare
Device X-MZM and Y-MZM and 90 ° of polarization rotator, polarization beam combiner are formed.
The present invention comprises the following steps at work：
(1) light wave sent from narrow linewidth laser is injected into palarization multiplexing Mach-Zehnder modulators；
(2) optical signal for inciding polarization point multiplexing Mach-Zehnder modulators respectively enters X-MZM and Y-MZM through shunt
In.The signal that antenna receives is separately input to X-MZM and Y-MZM prevention at radio-frequency port after electric amplifier.The letter of Y-MZM outputs
Number after 90 ° of polarization rotators, being input to polarization beam combiner with X-MZM output signal, to retrodeviate polarization state orthogonal, realizes polarization
State is multiplexed；
(3) output signal of palarization multiplexing Mach-Zehnder modulators is injected into polarization beam apparatus through Polarization Controller.Pass through tune
Whole Polarization Controller, palarization multiplexing optical signal can be by accurately polarization demultiplexings.Light is passed through in polarization beam apparatus output all the way
Delay line introduces relative time-delay；Another way passes through variable optical attenuator to minimize the difference power between Liang Ge branches；
(4) two ways of optical signals is input to photodetector through polarization beam combiner and carries out opto-electronic conversion, and the electric signal frequency spectrum of output leads to
Cross electric signal analyzer and carry out observation test；
The present invention proposes a kind of method of the wide-band microwave Direction-of-arrival based on microwave photon filtering, the program
Using polarization point multiplexing Mach-Zehnder modulators, with reference to optical delay line and light adjustable attenuator, two-tap microwave light is constructed
Subfilter.For the incoming wave of different angle, the response of wave filter changes with the difference that two-way is delayed, by input electricity
Signal carries out notch filter, observation and record notch location measurement result, so as to calculate arrival bearing, to wide-band microwave signal
Angle of arrival is estimated.
The constructed two-tap microwave photon filter of this programme, the limit of laser source coherency is eliminated by cross-polarization
System.The scheme proposed only needs a lasing light emitter and a modulator, can improve the stability of system, reduce system into
This.
The microwave photon filtering of the present invention is directly carried out in area of light, reaches microwave signal by the processing to optical signal
The purpose of filtering, bandwidth limitation and the electromagnetic interference of traditional microwave phase shift are overcome, therefore the performance of system has obtained very
Big raising.
Brief description of the drawings
Fig. 1 is the schematic diagram of the method for wide-band microwave Direction-of-arrival of the present invention based on microwave photon filtering；Figure
2nd, Fig. 3, Fig. 4 are experimental results figure, and Fig. 2 (a) is the spectrum of non-filtered broadband signal, and Fig. 2 (b) is broadband after filtering
The spectrum of signal, Fig. 3 are delay of the frequency offseting value of measurement for relative time, and Fig. 4 is the relative time-delay of measurement
(point) and corresponding measurement error (vertical bar).
Embodiment
Embodiments of the invention are elaborated below in conjunction with the accompanying drawings：The present embodiment using technical solution of the present invention before
Put and implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to down
The embodiment stated：
Fig. 1 is the schematic diagram of the method for wide-band microwave Direction-of-arrival of the present invention based on microwave photon filtering.It is wherein inclined
The multiplexing Mach-Zehnder modulators that shake are modulated to microwave signal, generate a polarisation-multiplexed signal；Palarization multiplexing Mach-
Zeng Deer modulators increase Dare modulator X-MZM and Y-MZM and 90 ° of polarization rotation by the parallel Mach of Y shunts, upper and lower two-way
Turn device, polarization beam combiner is formed；Polarization Controller is controlled, polarisation-multiplexed signal is demultiplexing as by two-way by polarization beam apparatus,
Relative time-delay is introduced using optical delay line, another way is using variable optical attenuator to minimize between Liang Ge branches all the way
Difference power；Two paths of signals is merged using polarization beam combiner, is output to photodetector；It can be obtained after photodetector beat frequency
To the microwave signal after after filtering.The output port of lasing light emitter is connected with palarization multiplexing Mach-Zehnder modulators input,
The output end of the modulator is connected with Polarization Controller input port；The output port of Polarization Controller and polarization beam apparatus it is defeated
Inbound port is connected；Input port of the output port of polarization beam apparatus respectively with optical delay line and adjustable optical attenuator is connected；Light
The output port of delay line and adjustable optical attenuator is connected with polarization beam combiner input port；Polarization beam combiner output port and light
The input port of electric explorer is connected；Photodetector exports electric signal.
In this example, the specific implementation step of method is：
Step 1：Lasing light emitter generation wavelength is 1552nm, the continuous light wave that power is 12dBm, and continuous light wave is input to half-wave electricity
Press for 3.5V, insertion loss 6dB palarization multiplexing Mach-Zehnder modulators in.1.6Gbps caused by random waveform maker
Non-return-to-zero signal and microwave signal maker caused by 18GHz local oscillators be mixed, as shown in Fig. 2 (a).Signal after mixing is divided into
Two-way is separately input to X-MZM and Y-MZM prevention at radio-frequency port.
Step 2：Polarisation-multiplexed signal after Polarization Controller and polarization beam apparatus demultiplexing by being divided into two-way, wherein defeated all the way
Enter to optical delay line, the change of angle of arrival is simulated by changing the time delay introduced by optical delay line.Meanwhile record with not
With trap frequency corresponding to relative time-delay, two groups of measurements have been carried out.In order to determine that the initial time between two-way branch prolongs
Late, measurement result is first used to calibrate.The frequency shift (FS) of measurement and corresponding time delay are fixed as shown in figure 3, slope is bigger
Frequency error measurement will cause bigger time delay measurement error, and the slope of theoretical curve is calculated as -21.2ps/GHz.
Step 3：By frequency offset after the measurement filtering of electric signal analyzer after calibration, relative time-delay is calculated.Fig. 4 shows
Measurement result is shown, its corresponding measurement error is less than ± 0.35ps.Assuming that antenna spacing is λ/2, then the measurement of angle of arrival misses
Difference is less than 0.72 °.Time delay scope be -14ps to 16ps, it is corresponding arrival angular region be -30.26 ° to 35.17 °.
To sum up, the present invention is based on microwave using realizations such as palarization multiplexing Mach-Zehnder modulators, differential group delay modules
The wide-band microwave Direction-of-arrival of photon filtering, it is simple in construction to be easily achieved, it is cheap, do not influenceed by electronic bottleneck,
It can be worked under the conditions of incoherent, this causes system to have more preferable robustness.
In a word, embodiments described above is only embodiments of the invention, is not only used for limiting the guarantor of the present invention
Protect scope, it is noted that for those skilled in the art, can be with present disclosure
Some equivalent variations and replacement are made, if the microwave photon filter, using different differential group delay values, measurement capability is not
Together, these equivalent variations and replacement and the adjustment of frequency range also should be regarded as the scope of protection of the invention.
Claims (4)
1. a kind of wide-band microwave Direction-of-arrival method based on microwave photon filtering, including lasing light emitter, palarization multiplexing horse
Conspicuous-Zeng Deer modulators, polarization beam combiner, Polarization Controller, polarization beam apparatus, optical delay line and photodetector, its feature
It is：The output port of lasing light emitter is connected with palarization multiplexing Mach-Zehnder modulators input, the output end of the modulator with
Polarization Controller input port is connected；The output port of Polarization Controller is connected with the input port of polarization beam apparatus；Polarization point
Input port of the output port of beam device respectively with optical delay line and adjustable optical attenuator is connected；Optical delay line and variable optical attenuation
The output port of device is connected with polarization beam combiner input port；The input port of polarization beam combiner output port and photodetector
It is connected, the output port connection electric signal analyzer of photodetector carries out observation test.
The palarization multiplexing Mach-Zehnder modulators are by the parallel Mach of Y shunts, upper and lower two-way-increasing Dare modulator X-
MZM and Y-MZM and polarization rotator, polarization beam combiner are formed.Incident optical signal is divided into two-way power phase by the Y shunts
Deng optical signal, respectively enter in X-MZM and Y-MZM.Radiofrequency signal is separately input to X-MZM and Y-MZM prevention at radio-frequency port.Y-
The signal of MZM outputs is input to polarization beam combiner after 90 ° of polarization rotators, with X-MZM output signal, and to retrodeviate polarization state orthogonal,
Realize polarization state multiplexing.
A differential group delay module is connected after the palarization multiplexing Mach-Zehnder modulators.The module is to two polarization states
Relative time-delay is introduced, after photodetector, whole system can be equivalent to the microwave photon filtering of two taps
Device.
The change of arrival bearing will produce tuning effect to above-mentioned microwave photon filter, by the trap frequency for measuring microwave signal
Rate, it is estimated that the arrival bearing of microwave signal.
2. the wide-band microwave Direction-of-arrival method according to claim 1 based on microwave photon filtering, its feature
It is：Polarization point multiplexing Mach-Zehnder modulators combination differential group delay module can realize that two-tap microwave photon trap is filtered
Ripple device.
3. the wide-band microwave Direction-of-arrival method according to claim 1 based on microwave photon filtering, its feature
It is：Pass through the relative time for measuring transmission trap to obtain between two signals received at the antenna element of two separation
Delay, is calculated time delay so as to obtain the estimation to wide-band microwave direction of arrival.
4. the wide-band microwave Direction-of-arrival method according to claim 1 based on microwave photon filtering, its feature
It is：Measurement range can be further improved by selecting larger differential group delay value.
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