CN104459360B - Microwave source phase noise test method and device based on microwave photon mixing technology - Google Patents
Microwave source phase noise test method and device based on microwave photon mixing technology Download PDFInfo
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Abstract
The invention discloses a microwave source phase noise test method and device based on a microwave photon mixing technology. The device comprises a microwave source, a microwave power divider, a microwave phase shifter, a laser source, a first electro-optical modulator, an optical fiber, a second electro-optical modulator, an optical band pass filter, a photoelectric detector, an electric low pass filter and an FFT analyzer, wherein the laser source, the first electro-optical modulator, the optical fiber, the second electro-optical modulator, the optical band pass filter, the photoelectric detector, the electric low pass filter and the FFT analyzer are sequentially connected in the optical path direction. According to the method, a microwave signal to be tested generated by the microwave source is divided into two paths through the microwave power divider, one path of the signal is modulated through the first electro-optical modulator to generate an initial modulated optical signal, the other path of the signal enters the second electro-optical modulator after passing through the microwave phase shifter and conducts modulation on the initial modulated optical signal generated after the optical fiber is delayed, and the finally obtained modulated optical signal passes through the optical band pass filter, the photoelectric detector and the electric low pass filter sequentially; the signals output by the electric low pass filter are collected by the FFT analyzer, and the phase noise of the microwave signal to be tested is obtained through computing. The method and device have the advantages of being wide in operation bandwidth, high in test sensitivity, free of changing along with the frequency and the like.
Description
Technical field
The present invention relates to a kind of microwave source phase noise method of testing and device based on microwave photon mixing technology, belong to
The test of microwave source phase noise, Microwave photonics technical field.
Background technology
To meet all kinds of military project applications to the higher and higher requirement of microwave oscillator phase noise, domestic and international researcher with
Great enthusiasm constantly reduces the phase noise of high-frequency microwave oscillator.At present, the phase noise of X-band commercial microwave oscillator
It has been less than -160dBc/Hz (OEWaves companies, 10GHz centre frequencies) at 10kHz frequency deviations, and general commercialization is mutually made an uproar analyzer
Mutually making an uproar for -120dBc/Hz@10kHz magnitudes can only be measured in 10GHz frequencies.Especially, the domestic measurement criteria master of phase noise
To be there is provided by Agilent E5505A, the background at 10GHz centre frequencies is mutually made an uproar more than -123dBc/Hz@10kHz, with actual test
Demand has the gap more than three orders of magnitude.
At present, most widely used microwave source phase noise method of testing is heterodyne method.In this approach, source to be measured is with one
The high-quality reference source of individual same frequency is mixed in frequency mixer, the phase jitter of the output voltage of frequency mixer and microwave source to be measured into
Direct ratio, can calculate the phase noise in source to be measured accordingly.This method testing precision and test bandwidth are limited to reference source.When
When the phase noise of measured source is less than the phase noise of reference source, correct result can not be obtained using the test system.
In the existing phase noise testing scheme based on fiber delay time, a continuous light is treated in electrooptic modulator
Micrometer wave source is modulated, and the optical signals photo-coupler for obtaining is divided into two-way, wherein all the way through fiber delay time.Above two ways of optical signals
After being converted to microwave signal in photodetector respectively, it is mixed in frequency mixer after microwave amplification, phase shift, and then according to defeated
Go out the phase noise that electric signal calculates source to be measured.Due to having used the devices such as microwave mixer, microwave amplifier, above test side
The bandwidth of operation and measuring accuracy of case can be limited by electrical parts such as frequency mixer and amplifiers, and measuring accuracy all can be with frequency
The increase of rate and reduce.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention to provide a kind of based on microwave photon mixing
The microwave source phase noise method of testing and device of technology, improve the bandwidth of operation of microwave source phase noise measuring system, reduce
The bottom of making an uproar of microwave source phase noise measuring system, that is, improve the measuring accuracy of phase noise measuring system.
Technical scheme：To achieve the above object, the technical solution adopted by the present invention is：
Microwave source phase noise test device based on microwave photon mixing technology, including it is microwave source, microwave power distributor, micro-
Ripple phase shifter, lasing light emitter, the first electrooptic modulator 1, optical fiber, the second electrooptic modulator 2, optical band pass filter, photodetector,
Electric low pass filter and fft analysis instrument；The output end of the lasing light emitter connects the input of the first electrooptic modulator 1, the first electricity
The output end of optical modulator 1 connects the input of the second electrooptic modulator 2 by optical fiber；The output end and microwave of the microwave source
The input connection of power splitter；The microwave power distributor has two output ends：One of output end and the first electrooptic modulator 1
Driving signal input be connected, another output end and microwave phase shifter input are connected；The microwave phase shifter it is defeated
Go out end to be connected with the driving signal input of the second electrooptic modulator 2；Along the second electrooptic modulator 2 output signal direction successively
Connection optical band pass filter, photodetector, electric low pass filter and fft analysis instrument.
Further, the electrooptic modulator 2 of first electrooptic modulator 1 and second is broad band electrooptic modulator；It is described
Broad band electrooptic modulator uses phase electrooptic modulator or intensity modulator or light polarization modulator.
Further, the microwave power distributor is wide-band microwave power splitter.
Further, the microwave phase shifter is wide-band microwave phase shifter.
A kind of microwave source phase noise method of testing based on microwave photon mixing technology, it is characterised in that：Microwave source is defeated
Go out microwave signal to be measured, microwave signal to be measured is divided into the first microwave signal and the second microwave signal by microwave power distributor, wherein the
One microwave signal is modulated through the first electrooptic modulator 1, generates initial modulation optical signal；The initial modulation optical signal is by optical fiber
Enter the second electrooptic modulator 2 after time delay, the time delay is τ；Second microwave signal is by entering the second electricity after microwave phase shifter
Optical modulator 2, wherein regulation microwave phase shifter makesIt is the phase-shift phase that the second microwave signal is passed through, ω is to be measured
The angular frequency of microwave signal；Second electrooptic modulator 2 is to the initial modulation optical signal after fiber delay time and by microwave phase shifter
The second microwave signal afterwards is modulated, and the second electrooptic modulator 2 exports final modulated optical signal；Using optical band pass filter
Final modulated optical signal is filtered；Beat frequency is carried out to the optical signal that optical band pass filter is exported using photodetector；
Enter electric low pass filter by the signal after beat frequency to be filtered；Electric low-pass filter output signal is gathered by fft analysis instrument
Data processing is carried out, the phase noise of microwave signal to be measured can be calculated according to the data obtained.
Beneficial effect：Microwave source phase noise method of testing and dress based on microwave photon mixing technology that the present invention is provided
Put：
1) present invention realizes microwave photon mixing using electrooptic modulator 1 and electrooptic modulator 2, has after microwave mixer
With it is roomy, dynamic range is big the characteristics of, the bandwidth of operation of phase noise measuring system can be significantly increased；
2) present invention, avoiding the active microwave devices such as microwave amplifier are used, microwave source phase noise test system can be reduced
Measuring accuracy is improved at the bottom of making an uproar of system, and measuring accuracy does not change with frequency.
3) extra reference source is not needed using delay line technical testing phase noise, only needs microwave source to be measured to prolong with itself
When after signal mixing, wherein more long for the delay line of time delay, i.e., optical fiber is more long, and the measuring accuracy to phase noise is higher.
Optical fiber has the advantages such as low-loss, big bandwidth, is best time delay medium.
Brief description of the drawings
Fig. 1 is principle schematic diagram. of the invention；
Fig. 2 is the present invention to a microwave source phase noise test result of 10GHz and Agilent E4447A test results
Comparison diagram；
Fig. 3 for it is of the invention make an uproar bottom at 1kHz frequency deviations and 10kHz frequency deviations with frequency variation diagram.
Specific embodiment
The present invention is further described below in conjunction with the accompanying drawings.
Microwave source phase noise test device based on microwave photon mixing technology, as shown in figure 1, including microwave source, micro-
Ripple power splitter, microwave phase shifter, lasing light emitter, the first electrooptic modulator 1, optical fiber, the second electric light being sequentially connected along optical path direction
Modulator 2, optical band pass filter, photodetector, electric low pass filter and fft analysis instrument；The output end of the microwave source with
The input connection of microwave power distributor；Two output ends of the microwave power distributor：One of output end is adjusted with the first electric light
The driving signal input of device processed 1 is connected, and another output end and microwave phase shifter input are connected；The microwave phase shifter
Output end be connected with the driving signal input of the second electrooptic modulator 2.
Lasing light emitter is used as optical carrier, and microwave source produces microwave signal to be measured；Microwave power distributor exports microwave source
Microwave signal to be measured is divided into two-way；Two electrooptic modulators are used to realize the modulation of electricity and light.
As shown in figure 1, microwave signal to be measured is divided into the first microwave signal and the second microwave signal by microwave power distributor；This two
Road microwave signal is respectively as driving input the first electrooptic modulator 1 and the second electrooptic modulator 2；First electrooptic modulator 1 will
First microwave signal is modulated to the light carrier of lasing light emitter output and exported, and the modulated signal of the output of the first electrooptic modulator 1 is first
Beginning modulated optical signal, initial modulation optical signal is by entering the second electrooptic modulator 2 after fiber delay time；Second electrooptic modulator 2
To be modulated on the initial modulation optical signal to after through fiber delay time by the second microwave signal after microwave phase shifter, obtain final
Modulated optical signal, final modulated optical signal enters optical band pass filter；Due to the light letter exported from the second electrooptic modulator 2
There are multiple sidebands on number, so being filtered to final modulated optical signal using optical band pass filter in the present invention, obtain just
Single order or negative one rank sideband；Enter electric low pass after beat frequency is carried out to the optical signal that optical band pass filter is exported using photodetector
Filter filtering, photodetector is for optical signal is converted into electric signal；Due to by the output letter after photodetector
Higher hamonic wave and phase noise information are contained in number, higher hamonic wave is filtered using electric low pass filter, by electric LPF
The output phase noise signal of device is gathered by Fast Fourier Transform Analyzer, and can be calculated microwave signal to be measured through data processing
Phase noise.
In this embodiment, the preferred wide-band microwave power splitter of microwave power distributor；The preferred wide-band microwave phase shifter of microwave phase shifter；
First electrooptic modulator 1, the preferred phase electrooptic modulator of the second electrooptic modulator 2.
In order that public understanding technical solution of the present invention, the test philosophy to above-mentioned test device is adjusted with the first electric light below
Device processed 1, the second electrooptic modulator 2 are introduced as a example by being phase electrooptic modulator：
If the first microwave signal of microwave power distributor output is E1T (), the second microwave signal are E2(t), wherein The light carrier E of lasing light emitter outputc(t)=Ecexp(jωct)。E2T () is by microwave phase shifter phase shift
After obtainFirst phase electrooptic modulator is by E1T () drives, then first phase Electro-optical Modulation
The signal of device output end is：
Wherein, V is the amplitude of microwave signal to be measured；As t=0,It is the initial phase of microwave signal to be measured；It is the phase by the second microwave signal after phase shift；I is imaginary unit, Vπ1It is first phase electrooptic modulator
Half-wave voltage.ω is the angular frequency of microwave signal to be measured, ωcIt is the angular frequency of light carrier；
After optical fiber is to first signal lag τ of phase electrooptic modulator output end：
To be injected in second phase electrooptic modulator through the signal after time delay, the signal is in second phase Electro-optical Modulation
By E in device3T () carries out second modulation, then the signal of second phase electrooptic modulator output end is：
Wherein, Vπ2It is second half-wave voltage of phase electrooptic modulator.By optical band pass filter, photodetector,
After electric low pass filter, output current iPDT () is：
Regulation microwave phase shifter makesThen above formula is represented by：
Such as formula (5) it can be seen that the signal of electric low pass filter output is related to microwave signal phase noise to be measured.Formula
(5) signal is gathered by fft analysis instrument, you can be calculated the phase noise of tested microwave source.
Fig. 2 is microwave source phase noise test device of the present invention based on microwave photon mixing technology to a 10GHz
Microwave source phase noise test result and commercial apparatus (Agilent E4447A) test result comparison diagram.Wherein the first curve is to adopt
The result tested with Agilent E4447A, the second curve is using microwave source phase of the present invention based on microwave photon mixing technology
The result of noise-measuring system test.Found by contrasting, the microwave source based on microwave photon mixing technology proposed by the present invention
Phase noise test device is fine with what is coincide using commercial apparatus test results, indicates the feasibility of this invention and accurate
Property.
Fig. 3 be the bottom of making an uproar of microwave source phase noise test device of the present invention based on microwave photon mixing technology in 1kHz and
With frequency variation diagram at 10kHz frequency deviations.As can be seen from the figure the present invention in microwave source phase noise test device work band
Width reaches 40GHz；It can also be seen that microwave source phase noise test device makes an uproar bottom at 1kHz and 10kHz frequency deviations in the present invention
Respectively lower than -121dBc/Hz and -136dBc/Hz；Change with frequency, change difference of the bottom at 1kHz and 10kHz frequency deviations of making an uproar is small
In 3dB and 1dB.Because commercial phase noise measurement instrument 5052B bandwidth of operation is 7GHz, need to such as measure the micro- of higher frequency
The phase noise of wave source, then need to be by down-conversion device；And when the measuring instrument is operated in 7GHz, its bottom of making an uproar in 1kHz and
It is respectively -118dBc/Hz and -126dBc/Hz at 10kHz frequency deviations.It can be seen that of the invention based on microwave photon mixing
The microwave source phase noise test device of technology has bandwidth of operation big and certainty of measurement advantage high.
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (5)
1. the microwave source phase noise test device of microwave photon mixing technology is based on, it is characterised in that：Including microwave source, microwave
Power splitter, microwave phase shifter, lasing light emitter, the first electrooptic modulator (1), optical fiber, the second electrooptic modulator (2), light bandpass filtering
Device, photodetector, electric low pass filter and fft analysis instrument；The output end of the lasing light emitter connects the first electrooptic modulator (1)
Input, the output end of the first electrooptic modulator (1) passes through the input that optical fiber connects the second electrooptic modulator (2)；It is described
The output end of microwave source is connected with the input of microwave power distributor；The microwave power distributor has two output ends：One of them is defeated
Go out end to be connected with the driving signal input of the first electrooptic modulator (1), another output end and microwave phase shifter input
Connection；The output end of the microwave phase shifter is connected with the driving signal input of the second electrooptic modulator (2)；Along the second electric light
The output signal direction of modulator (2) is sequentially connected optical band pass filter, photodetector, electric low pass filter and fft analysis
Instrument.
2. the microwave source phase noise test device based on microwave photon mixing technology according to claim 1, its feature
It is：First electrooptic modulator (1) and the second electrooptic modulator (2) are broad band electrooptic modulator；The broad band electrooptic
Modulator uses phase electrooptic modulator or intensity modulator or light polarization modulator.
3. the microwave source phase noise test device of microwave photon mixing technology is based on according to claim 1, and its feature exists
In：The microwave power distributor is wide-band microwave power splitter.
4. the microwave source phase noise test device of microwave photon mixing technology is based on according to claim 1, and its feature exists
In：The microwave phase shifter is wide-band microwave phase shifter.
5. a kind of microwave source phase noise method of testing based on microwave photon mixing technology, it is characterised in that：Microwave source is exported
Microwave signal to be measured, microwave signal to be measured is divided into the first microwave signal and the second microwave signal by microwave power distributor；Lasing light emitter is produced
Raw optical carrier sends into the first electrooptic modulator (1), and the first microwave signal loads on the first electrooptic modulator (1) simultaneously,
The optical carrier that lasing light emitter is produced is modulated, initial modulation optical signal is generated；The initial modulation optical signal is by light
Enter the second electrooptic modulator (2) after fine time delay, the time delay is τ；Second microwave signal after microwave phase shifter by loading on
Second electrooptic modulator (2), wherein regulation microwave phase shifter makes It is the phase-shift phase that the second microwave signal is passed through,
ω is the angular frequency of microwave signal to be measured；Second electrooptic modulator (2) is to the initial modulation optical signal and process after fiber delay time
The second microwave signal after microwave phase shifter is modulated, and the second electrooptic modulator (2) exports final modulated optical signal；Utilize
Optical band pass filter is filtered to final modulated optical signal；The light exported to optical band pass filter using photodetector is believed
Number carry out beat frequency；Enter electric low pass filter by the signal after beat frequency to be filtered；Electric low-pass filter output signal is by FFT
Analyzer collection carries out data processing, and the phase noise of microwave signal to be measured can be calculated according to the data obtained.
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