CN104459360A - 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 PDF

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Publication number
CN104459360A
CN104459360A CN201410796588.6A CN201410796588A CN104459360A CN 104459360 A CN104459360 A CN 104459360A CN 201410796588 A CN201410796588 A CN 201410796588A CN 104459360 A CN104459360 A CN 104459360A
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microwave
signal
electrooptic modulator
pass filter
optical
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CN104459360B (en
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张方正
朱登建
潘时龙
周沛
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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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

Based on microwave source phase noise method of testing and the device of microwave photon mixing technology
Technical field
The present invention relates to a kind of microwave source phase noise method of testing based on microwave photon mixing technology and device, belong to the test of microwave source phase noise, Microwave photonics technical field.
Background technology
For meeting all kinds of military project application requirement more and more higher to microwave oscillator phase noise, domestic and international researchist constantly reduces the phase noise of high-frequency microwave oscillator with great enthusiasm.At present, the phase noise of X-band commercial microwave oscillator at 10kHz frequency deviation place lower than-160dBc/Hz (OEWaves company, 10GHz centre frequency), and general commercial analyser of making an uproar mutually can only measure making an uproar mutually of-120dBc/Hz@10kHz magnitude in 10GHz frequency.Especially, the domestic measurement standard of phase noise provides primarily of Agilent E5505A, and the background at 10GHz centre frequency place is made an uproar mutually and is greater than-123dBc/Hz 10kHz, has the gap of more than three orders of magnitude with actual testing requirement.
At present, most widely used microwave source phase noise method of testing is process of heterodyning.In this approach, source to be measured is with high-quality reference source mixing in frequency mixer of a same frequency, and the output voltage of frequency mixer is directly proportional to the phase jitter of microwave source to be measured, can calculate the phase noise in source to be measured accordingly.This method testing precision and test bandwidth are limited to reference source.When phase noise lower than reference source of the phase noise of measured source, this test macro is used not obtain correct result.
Based in the phase noise testing scheme of fiber delay time, a continuous light is modulated by microwave source to be measured in electrooptic modulator existing, and the optical signals photo-coupler obtained is divided into two-way, and wherein a road is through fiber delay time.After above two ways of optical signals is converted to microwave signal respectively in photodetector, mixing in frequency mixer after microwave amplification, phase shift, and then the phase noise calculating source to be measured according to output electric signal.Owing to employing the device such as microwave mixer, microwave amplifier, the bandwidth of operation of above testing scheme and measuring accuracy can be subject to the restriction of the electrical part such as frequency mixer and amplifier, and measuring accuracy all can reduce with the increase of frequency.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of microwave source phase noise method of testing based on microwave photon mixing technology and device, improve the bandwidth of operation of microwave source phase noise measuring system, reduce making an uproar at the end of microwave source phase noise measuring system, namely improve the measuring accuracy of phase noise measuring system.
Technical scheme: for achieving the above object, the technical solution used in the present invention is:
Based on the microwave source phase noise proving installation of microwave photon mixing technology, comprise microwave source, microwave power distributor, microwave 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 terminal of described lasing light emitter connects the input end of the first electrooptic modulator 1, and the output terminal of the first electrooptic modulator 1 passes through the input end of Fiber connection second electrooptic modulator 2; The output terminal of described microwave source is connected with the input end of microwave power distributor; Described microwave power distributor has two output terminals: one of them output terminal is connected with the driving signal input of the first electrooptic modulator 1, and another output terminal is connected with microwave phase shifter input end; The output terminal of described microwave phase shifter is connected with the driving signal input of the second electrooptic modulator 2; Output signal direction along the second electrooptic modulator 2 connects optical band pass filter, photodetector, electric low-pass filter and fft analysis instrument successively.
Further, described first electrooptic modulator 1 and the second electrooptic modulator 2 are broad band electrooptic modulator; Described broad band electrooptic modulator adopts phase place electrooptic modulator or intensity modulator or light polarization modulator.
Further, described microwave power distributor is wide-band microwave power splitter.
Further, described 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 characterized in that: microwave source exports 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 first microwave signal is modulated through the first electrooptic modulator 1, generates initial modulation light signal; Described initial modulation light signal enters the second electrooptic modulator 2 after fiber delay time, and described time delay is τ; Second microwave signal enters the second electrooptic modulator 2 after microwave phase shifter, wherein regulates microwave phase shifter to make be the phase-shift phase of the second microwave signal process, ω is the angular frequency of microwave signal to be measured; Initial modulation light signal after second electrooptic modulator 2 pairs fiber delay time and the second microwave signal after microwave phase shifter are modulated, and the second electrooptic modulator 2 exports final modulated light signal; Optical band pass filter is utilized to carry out filtering to final modulated light signal; Photodetector is utilized to carry out beat frequency to the light signal that optical band pass filter exports; Signal after beat frequency enters electric low-pass filter and carries out filtering; Electricity low-pass filter output signal carries out data processing by the collection of fft analysis instrument, can calculate the phase noise of microwave signal to be measured according to the data obtained.
Beneficial effect: the microwave source phase noise method of testing based on microwave photon mixing technology provided by the invention and device:
1) the present invention adopts electrooptic modulator 1 and electrooptic modulator 2 to realize microwave photon mixing, has the feature that band is roomy, dynamic range is large, can enlarge markedly the bandwidth of operation of phase noise measuring system after microwave mixer;
2) present invention, avoiding active microwave devices such as using microwave amplifier, measuring accuracy is improved in the end of making an uproar that can reduce microwave source phase noise measuring system namely, and measuring accuracy is not with frequency change.
3) utilize delay line technical testing phase noise not need extra reference source, only need the signal mixing after microwave source to be measured and self time delay, the delay line wherein for time delay is longer, and namely optical fiber is longer, higher to the measuring accuracy of phase noise.Optical fiber has the advantage such as low-loss, large bandwidth, is best time delay medium.
Accompanying drawing explanation
Fig. 1 is structural principle schematic diagram of the present invention;
Fig. 2 is that the present invention is to the microwave source phase noise test result of a 10GHz and Agilent E4447A test result comparison diagram;
Fig. 3 be the end of making an uproar of the present invention at 1kHz frequency deviation and 10kHz frequency deviation place with frequency change figure.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
Based on the microwave source phase noise proving installation of microwave photon mixing technology, as shown in Figure 1, microwave source, microwave power distributor, microwave phase shifter, the 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 the fft analysis instrument that connect successively along optical path direction is comprised; The output terminal of described microwave source is connected with the input end of microwave power distributor; Two output terminals of described microwave power distributor: one of them output terminal is connected with the driving signal input of the first electrooptic modulator 1, and another output terminal is connected with microwave phase shifter input end; The output terminal of described microwave phase shifter is 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; The microwave signal to be measured that microwave source exports by microwave power distributor is divided into two-way; Two electrooptic modulators are for realizing 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 way microwave signals is respectively as driving input first electrooptic modulator 1 and the second electrooptic modulator 2; First electrooptic modulator 1 first microwave signal is modulated to lasing light emitter export light carrier on export, first electrooptic modulator 1 export modulation signal be initial modulation light signal, initial modulation light signal enters the second electrooptic modulator 2 after fiber delay time; The second microwave signal after microwave phase shifter is modulated on the initial modulation light signal after fiber delay time by the second electrooptic modulator 2, obtains final modulated light signal, and final modulated light signal enters optical band pass filter; Because the light signal exported from the second electrooptic modulator 2 has multiple sideband, so utilize optical band pass filter to carry out filtering to final modulated light signal in the present invention, obtain positive single order or negative single order sideband; Enter electric low-pass filter filtering after utilizing photodetector to carry out beat frequency to the light signal that optical band pass filter exports, photodetector is used to light signal to convert electric signal to; Owing to containing higher hamonic wave and phase noise information in the output signal after photodetector, utilize electric low-pass filter filtering higher hamonic wave, output phase noise signal through electric low-pass filter is gathered by Fast Fourier Transform Analyzer, and can calculate the phase noise of microwave signal to be measured through data processing.
In this enforcement, 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, second electrooptic modulator 2 is phase place electrooptic modulator preferably.
In order to make public understanding technical solution of the present invention, for the first electrooptic modulator 1, second electrooptic modulator 2, phase place electrooptic modulator being to the test philosophy of above-mentioned proving installation below and being introduced:
If the first microwave signal that microwave power distributor exports is E 1t (), the second microwave signal are E 2(t), wherein the light carrier E that lasing light emitter exports c(t)=E cexp (j ω ct).E 2t () obtains after microwave phase shifter phase shift first phase place electrooptic modulator is by E 1t () drives, then the signal of first phase place electrooptic modulator output terminal is:
E o 1 ( t ) = E c expi [ ω c t + π E 1 ( t ) V π 1 ] - - - ( 1 )
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; be through the phase place of the second microwave signal after phase shift; I is imaginary unit, V π 1it is the half-wave voltage of first phase place electrooptic modulator.ω is angular frequency, the ω of microwave signal to be measured cfor the angular frequency of light carrier;
By optical fiber to after the signal lag τ of first phase place electrooptic modulator output terminal:
E o 2 ( t ) = E c expi [ ω c ( t - τ ) + π E 1 ( t ) V π 1 ] - - - ( 2 )
By in second the phase place electrooptic modulator of the signal injection after time delay, this signal in second phase place electrooptic modulator by E 3t () carries out second time modulation, then the signal of second phase place electrooptic modulator output terminal is:
E o 3 ( t ) = E c expi [ ω c ( t - τ ) + π E 1 ( t - τ ) V π 1 + π E 3 ( t ) V π 2 ] - - - ( 3 )
Wherein, V π 2it is the half-wave voltage of second phase place electrooptic modulator.After optical band pass filter, photodetector, electric low-pass filter, output current i pD(t) be:
Adjustment microwave phase shifter makes then above formula can be expressed as:
Can find out that the signal that this electric low-pass filter exports is relevant to microwave signal phase noise to be measured such as formula (5).Formula (5) signal gathers through fft analysis instrument, can calculate the phase noise of tested microwave source.
Fig. 2 be the present invention is based on microwave photon mixing technology microwave source phase noise proving installation to the microwave source phase noise test result of a 10GHz and commercial apparatus (Agilent E4447A) test result comparison diagram.Wherein the first curve is the result adopting Agilent E4447A test, and the second curve is the result adopting the microwave source phase noise proving installation test that the present invention is based on microwave photon mixing technology.Found by contrast, the microwave source phase noise proving installation based on microwave photon mixing technology that the present invention proposes is fine with what adopt commercial apparatus test result to coincide, indicates feasibility and the accuracy of this invention.
Fig. 3 be the end of making an uproar of the microwave source phase noise proving installation that the present invention is based on microwave photon mixing technology at 1kHz and 10kHz frequency deviation place with frequency change figure.As can be seen from the figure in the present invention, the bandwidth of operation of microwave source phase noise proving installation reaches 40GHz; It can also be seen that the end of making an uproar of microwave source phase noise proving installation in the present invention at 1kHz and 10kHz frequency deviation place respectively lower than-121dBc/Hz and-136dBc/Hz; With frequency change, the end of making an uproar, is less than 3dB and 1dB respectively in the change at 1kHz and 10kHz frequency deviation place.Due to, commercial phase noise measurement instrument 5052B bandwidth of operation is 7GHz, as the phase noise of the microwave source of higher frequency need be measured, then and need by down-conversion device; And when this surveying instrument is operated in 7GHz, its end of making an uproar is-118dBc/Hz and-126dBc/Hz respectively at 1kHz and 10kHz frequency deviation place.This shows that the microwave source phase noise proving installation based on microwave photon mixing technology of the present invention has the advantage that work strip is roomy and measuring accuracy is high.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (5)

1. based on the microwave source phase noise proving installation of microwave photon mixing technology, it is characterized in that: comprise microwave source, microwave power distributor, microwave 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 terminal of described lasing light emitter connects the input end of the first electrooptic modulator (1), and the output terminal of the first electrooptic modulator (1) passes through the input end of Fiber connection second electrooptic modulator (2); The output terminal of described microwave source is connected with the input end of microwave power distributor; Described microwave power distributor has two output terminals: one of them output terminal is connected with the driving signal input of the first electrooptic modulator (1), and another output terminal is connected with microwave phase shifter input end; The output terminal of described microwave phase shifter is connected with the driving signal input of the second electrooptic modulator (2); Output signal direction along the second electrooptic modulator (2) connects optical band pass filter, photodetector, electric low-pass filter and fft analysis instrument successively.
2. a kind of microwave source phase noise proving installation based on microwave photon mixing technology according to claim 1, is characterized in that: described first electrooptic modulator (1) and the second electrooptic modulator (2) are broad band electrooptic modulator; Described broad band electrooptic modulator adopts phase place electrooptic modulator or intensity modulator or light polarization modulator.
3., according to claim 1 based on the microwave source phase noise proving installation of microwave photon mixing technology, it is characterized in that: described microwave power distributor is wide-band microwave power splitter.
4., according to claim 1 based on the microwave source phase noise proving installation of microwave photon mixing technology, it is characterized in that: described microwave phase shifter is wide-band microwave phase shifter.
5. the microwave source phase noise method of testing based on microwave photon mixing technology, it is characterized in that: microwave source exports 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 first microwave signal is through the first electrooptic modulator (1) modulation, generates initial modulation light signal; Described initial modulation light signal enters the second electrooptic modulator (2) after fiber delay time, and described time delay is τ; Second microwave signal enters the second electrooptic modulator (2) after microwave phase shifter, wherein regulates microwave phase shifter to make be the phase-shift phase of the second microwave signal process, ω is the angular frequency of microwave signal to be measured; Second electrooptic modulator (2) is modulated the initial modulation light signal after fiber delay time and the second microwave signal after microwave phase shifter, and the second electrooptic modulator (2) exports final modulated light signal; Optical band pass filter is utilized to carry out filtering to final modulated light signal; Photodetector is utilized to carry out beat frequency to the light signal that optical band pass filter exports; Signal after beat frequency enters electric low-pass filter and carries out filtering; Electricity low-pass filter output signal carries out data processing by the collection of fft analysis instrument, can calculate the phase noise of microwave signal to be measured according to the data obtained.
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