CN106771689A - A kind of ultra wide band phase noise measuring system - Google Patents
A kind of ultra wide band phase noise measuring system Download PDFInfo
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- CN106771689A CN106771689A CN201710130665.8A CN201710130665A CN106771689A CN 106771689 A CN106771689 A CN 106771689A CN 201710130665 A CN201710130665 A CN 201710130665A CN 106771689 A CN106771689 A CN 106771689A
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- phase noise
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/26—Measuring noise figure; Measuring signal-to-noise ratio
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Abstract
The present invention relates to a kind of ultra wide band phase noise measuring system, mainly solve that current phase noise measuring system precision is low, error big, system architecture is complicated, high cost, is difficult to realize the problem of ultra-wide tape test and adaptive testing.The system includes modulation control module, the optical modulator module being connected with modulation control module, the photoelectric detection module being connected with optical modulator module, the low pass filter being connected with photoelectric detection module, the computer being connected with low pass filter.The present invention preferably resolves the problem using the design based on balance photodetector, can be used in the test of ultra-wide band radio-frequency microwave signal phase noise.
Description
Technical field
The present invention relates to test system field, be related specifically to it is a kind of for communicating, remote-control romote-sensing, instrument and meter, aviation
The ultra wide band phase noise measuring system in the fields such as Space Equipment, radar imagery, Medical Instruments.
Background technology
At present, the direct frequency spectrograph method realized to the main useful microwave device of measurement of microwave signal source phase noise,
Beat method, frequency-discrimination method and Phase Demodulation.Direct frequency spectrograph method method is simple, but by frequency spectrograph dynamic range and minimum resolution bandwidth
Limitation, the method is only suitable for the of a relatively high signal source of the measurement smaller, phase noise of drift.Beat method and Phase Demodulation are utilized locks phase
Method is converted to signal mutual phase fluctuation the change of corresponding latch voltage, then improves measurement with certain multiplication factor
Resolution ratio, but methods described must use the frequency synthesis of low noise as standard frequency so that be using methods described
System equipment is complicated, cost is high.Frequency-discrimination method solves the problems, such as big delay, but because frequency-discrimination method is using common electricity frequency mixer, mixes
The flatness of frequency device and frequency response influence very big on measurement result, and are difficult to be extended to the mixing bandwidth of common electric frequency mixer
More than 40GHz, it is therefore desirable to carry out the method for multiple frequency conversion to high-frequency microwave signal source to realize the measurement to its phase noise.
Therefore it provides one kind can realize that the rational high-frequency microwave signal source phase of ultra wide band, high accuracy, simple structure is made an uproar
Sounding test system is just necessary.
The content of the invention
The present invention is directed to low existing microwave signal source phase noise measuring system certainty of measurement, system composition complexity, cost
It is too high, the problems such as be difficult to ultra-wideband detection, propose a kind of ultra wide band phase noise measurement based on balance photodetector
System.
To solve the above problems, technical solution of the present invention includes：A kind of ultra wide band phase noise measuring system is provided, it is described
System includes modulation control module, the optical modulator module being connected with modulation control module, the light being connected with optical modulator module
Electric detecting module, the low pass filter 204 being connected with photoelectric detection module, the computer 205 being connected with low pass filter；
The modulation control module control optical modulator module operating point is all the time in the range of linear modulation；
The optical modulator module modulates onto light wave microwave signal to be measured and then output light carries radiofrequency signal；
The light that the photoelectric detection module exports optical modulator module carries radiofrequency signal and is converted into microwave signal to be measured
The direct current signal of phase noise information.
Further, the modulation control module includes modulating driver 105, the 1st light being connected with modulating driver
The photodetector 107 of electric explorer 103 and the 2nd.
Further, the optical modulator module includes narrow linewidth distributed feedback laser 101, distributed with narrow linewidth anti-
The polarization-maintaining fiber coupler 102 that feedback laser is connected, the intensity type optical modulator being connected with polarization-maintaining fiber coupler 102
104, the 1st single-mode optical-fibre coupler 108 being connected with intensity type optical modulator 104；
The modulating frequency of the intensity type optical modulator 104 is more than tested microwave signal frequency.
Further, the coupling ratio of the polarization-maintaining fiber coupler 102 is 1:99.
Further, the coupling ratio of the 1st single-mode optical-fibre coupler 108 is 1:99.
Further, the photoelectric detection module includes the 2nd single-mode optical-fibre coupler 109, with the 2nd single-mode optical-fibre coupler
109 the 1st fibre delay lines 201 and the 2nd fibre delay line 202 being connected, with the 1st fibre delay line and the 2nd fibre delay line
The adjustment of balance photodetector 203 being connected；
The coupling ratio of the 2nd single-mode optical-fibre coupler 109 is 50:50；
The three dB bandwidth frequency of the adjustment of balance photodetector 203 is more than tested microwave signal frequency.
Further, the 1st fibre delay line 201 includes photoswitch 1, the fiber optic loop 1 and optical fiber being connected with photoswitch 1
Ring 2, the photoswitch 2 being connected with fiber optic loop 1 and fiber optic loop 2.
Further, the length of the fiber optic loop 1 is 5 kms, and the length of fiber optic loop 2 is 300~500 meters.
Further, the 2nd fibre delay line 202 is automatically controlled fibre delay line, and its length is not more than 10 millimeters.
The present invention also provides a kind of application method for ultra wide band phase noise measuring system, it is characterised in that：It is described
Method includes：
(1) open system, sets microwave signal frequency parameter to be measured, range parameter, phase noise parameter.
(2) narrow linewidth distributed feedback laser 101 produces polarised light to enter intensity type light through polarization-maintaining fiber coupler 102
Modulator 104；
(3) modulator driver 105 is operated in linear work point by procedure auto-control intensity type optical modulator, accesses
Microwave signal to be measured；
(4) the 2nd fibre delay line is adjusted, adjustment of balance photodetector 203 is output as with microwave signal phase to be measured
The direct current signal of position noise information；
(5) data acquisition is carried out, algorithm process is carried out to institute's gathered data and the phase noise of microwave signal to be measured is obtained
As a result；
(6) power-off operation is performed.
The present invention, based on balance photodetector, is to be capable of achieving ultra wide band phase to make an uproar without multiple frequency conversion or segmentation frequency conversion
Sound test, the 1st fibre delay line of big retardation is used for providing prolong different to the phase noise measurement offer at different frequency deviations
Chi Liang, the 2nd fibre delay line is used for adjusting into balanced detector two paths of signals in orthogonal operating point.Have the beneficial effect that：
Effect one：Realize that ultra wide band phase noise is tested without multiple frequency conversion or segmentation frequency conversion, system constitute it is simple, into
This lower, measurement frequency band is wider；
Effect two：The error that multiple parts are introduced is reduced, test flatness and accuracy is improve；
Effect three：The optimal test mode of test system is calibrated and demarcated, the adaptive measuring ability of test system is improved.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Accompanying drawing 1 is the general frame of the invention.
Accompanying drawing 2 is detailed diagram of the invention.
Accompanying drawing 3 is software flow pattern of the invention.
In accompanying drawing 2, narrow linewidth belt distributed feedback laser -101, polarization-maintaining fiber coupler -102, photodetector 1-
103, intensity type optical modulator -104, modulating driver -105, microwave signal -106 to be measured, photodetector 2-107, single-mode optics
Fine coupler 1-108, single-mode optical-fibre coupler 2-109, fibre delay line 1-201, fibre delay line 2-202, adjustment of balance light
Electric explorer -203, LPF -204, computer -205.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Embodiment 1
As shown in figure 1, the present embodiment provides a kind of ultra wide band phase noise measuring system and application method, the test system
System includes modulation control module, the optical modulator module being connected with modulation control module, the photoelectricity being connected with optical modulator module
Detecting module, the low pass filter being connected with photoelectric detection module, the computer being connected with low pass filter.
As shown in Fig. 2 the modulation control module includes modulating driver 105, the be connected with modulating driver 105
1 photodetector 103 and the 2nd photodetector 107；
The modulation control module is by the 1st photodetector 103 and the 2nd photodetector 107 from polarization-maintaining fiber coupler
102 and the coupling of the 1st single-mode optical-fibre coupler 108 obtained by optical signal be transformed into electric signal and controlled by modulator driver 105
Optical modulator module operating point is all the time in the range of linear modulation.
The optical modulator module includes narrow linewidth distributed feedback laser 101, with narrow linewidth distributed feedback laser
101 polarization-maintaining fiber couplers 102 being connected, the intensity type optical modulator 104 being connected with polarization-maintaining fiber coupler 102, with
The 1st single-mode optical-fibre coupler 108 that intensity type optical modulator 104 is connected；
The optical modulator module is adjusted using the polarised light that narrow linewidth distributed feedback laser 101 is produced by intensity type light
Device processed 104 modulates onto light wave side microwave signal to be measured and then output light carries radiofrequency signal；
The modulating frequency of the intensity type optical modulator 104 is more than tested microwave signal frequency.
The coupling ratio of the polarization-maintaining fiber coupler 102 is 1:99, make what narrow linewidth distributed feedback laser 101 was produced
The centesimal signal of polarised light is coupled into the 1st photodetector 103, and percent ninety-nine signal is adjusted into intensity type light
Device processed 104.
The coupling ratio of the 1st single-mode optical-fibre coupler 108 is 1:99, make the output signal of intensity type optical modulator 104
1 percent are coupled into the 2nd photodetector 107, and percent ninety-nine signal enters photoelectric detection module.
The photoelectric detection module includes the 2nd single-mode optical-fibre coupler 109, is connected with the 2nd single-mode optical-fibre coupler 109
The 1st fibre delay line 201 and the 2nd fibre delay line 202, the height being connected with the 1st fibre delay line and the 2nd fibre delay line
Speed balance photodetector 203；
The light that the photoelectric detection module exports optical modulator module carries radiofrequency signal through the 2nd single-mode optical-fibre coupler 109
It is divided into two-way, leads up to the 1st fibre delay line 201 and enter adjustment of balance photodetector 203, separately leads up to the 2nd optical fiber
Delay line 202 enters adjustment of balance photodetector 203, and adjustment of balance photodetector 203 is converted to light load radiofrequency signal
Direct current signal with microwave signal phase noise information to be measured；
The coupling ratio of the 2nd single-mode optical-fibre coupler 109 is 50:50, make to enter the 2nd single-mode optical-fibre coupler 109
Light carries radiofrequency signal etc. point and enters the 1st fibre delay line 201 and the 2nd fibre delay line 202；
The three dB bandwidth frequency of the adjustment of balance photodetector 203 is more than tested microwave signal frequency, is ensured with this
Systematic survey bandwidth.
1st fibre delay line 201 includes photoswitch 1, the fiber optic loop 1 and fiber optic loop 2 being connected with photoswitch 1, with light
The photoswitch 2 that fine ring 1 is connected with fiber optic loop 2.
The length of the fiber optic loop 1 is 5 kms, and the length of fiber optic loop 2 is 300~500 meters.
2nd fibre delay line 202 is automatically controlled fibre delay line, and its length is not more than 10 millimeters.
1st fibre delay line 201 and the 2nd fibre delay line 202 are used for adjusting into balance photodetector two-way
Phase difference between signal.
The direct current signal with microwave signal phase noise information to be measured of the output of adjustment of balance photodetector 203 passes through
Final phase noise test result is obtained by computer acquisition treatment after low pass filter, signal processing flow is as follows：
(1) the input microwave signal to be measured is expressed as：V=Vocos(2πfot+2πΔfτ)；
Wherein, VoIt is microwave signal amplitude, Δ f shakes for microwave signal frequency, and 2 π Δ f τ shake for microwave signal frequency
Phase noise after one section of delay, τ.
(2) 109 points through the 2nd single-mode optical-fibre coupler of the light load radiofrequency signal that the optical modulator module is exported is two-way, warp
It is after the arrival adjustment of balance of 1st fibre delay line 201 photodetector 203：V=Vo cos(2πfot+2πΔfτd)；
Wherein, τdIt is the retardation of the 1st fibre delay line 201.
(3) 109 points through the 2nd single-mode optical-fibre coupler of the light load radiofrequency signal that the optical modulator module is exported is two-way, warp
It is after the arrival adjustment of balance of 2nd fibre delay line 202 photodetector 203:V=Vo cos(2πfot+2πΔfτo)；
Wherein, τoIt is the retardation of the 2nd fibre delay line 202.
(4) two paths of signals is after adjustment of balance photodetector 203：
(5) the 2nd fibre delay line 202 of regulation makes 2 π fot+πΔfτo-πΔfτd=(2m+1) pi/2s, now adjustment of balance light
Electric explorer 203 is output as：
(6) the retardation τ of the 2nd fibre delay line 202oIt is minimum with microwave signal frequency shake Δ f, adjustment of balance light
The output of electric explorer 203 is further represented as：
(7) by the formulaCarry out Fourier transformation and can obtain microwave signal phase to be measured to make an uproar
Sound.
The present embodiment also provides a kind of application method for ultra wide band phase noise measuring system, and methods described includes：
(1) open system, sets microwave signal frequency parameter to be measured, range parameter, phase noise parameter；
(2) narrow linewidth distributed feedback laser 101 produces polarised light to enter intensity type light through polarization-maintaining fiber coupler 102
Modulator 104；
(3) modulating driver 105 is operated in linear work point by procedure auto-control intensity type optical modulator, and access is treated
Survey microwave signal；
(4) the 2nd fibre delay line is adjusted, adjustment of balance photodetector 203 is output as direct current signal；
(5) data acquisition is carried out, algorithm process is carried out to institute's gathered data and the phase noise of microwave signal to be measured is obtained
As a result；
(6) power-off operation is performed.
Although being described to illustrative specific embodiment of the invention above, in order to the technology of the art
Personnel are it will be appreciated that the present invention, but the present invention is not limited only to the scope of specific embodiment, to the common skill of the art
For art personnel, as long as long as various change is in appended claim restriction and the spirit and scope of the invention for determining, one
The innovation and creation using present inventive concept are cut in the row of protection.
Claims (9)
1. a kind of ultra wide band phase noise measuring system, it is characterised in that：The system includes modulation control module, is controlled with modulation
The optical modulator module that molding block is connected, the photoelectric detection module being connected with optical modulator module, is connected with photoelectric detection module
The low pass filter (204) for connecing, the computer being connected with low pass filter (205)；
The modulation control module control optical modulator module operating point is all the time in the range of linear modulation；
The optical modulator module modulates onto light wave microwave signal to be measured and then output light carries radiofrequency signal；
The light that the photoelectric detection module exports optical modulator module carries radiofrequency signal and is converted into microwave signal phase to be measured
The direct current signal of noise information.
2. a kind of ultra wide band phase noise measuring system according to claim 1, it is characterised in that：The modulation control mould
Block includes modulating driver (105), the 1st photodetector (103) being connected with modulating driver and the 2nd photodetector
(107)。
3. a kind of ultra wide band phase noise measuring system according to claim 1, it is characterised in that：The optical modulator module
Including narrow linewidth distributed feedback laser (101), the polarization maintaining optical fibre being connected with narrow linewidth distributed feedback laser (101)
Coupler (102), the intensity type optical modulator (104) being connected with polarization-maintaining fiber coupler (102), with intensity type optical modulator
(104) the 1st single-mode optical-fibre coupler (108) being connected；
The modulating frequency of the intensity type optical modulator (104) is more than tested microwave signal frequency.
4. a kind of ultra wide band phase noise measuring system according to claim 3, it is characterised in that：The polarization maintaining optical fibre coupling
The coupling ratio of clutch (102) is 1:99.
5. a kind of ultra wide band phase noise measuring system according to claim 3, it is characterised in that：1st single-mode optics
The coupling ratio of fine coupler (108) is 1:99.
6. a kind of ultra wide band phase noise measuring system according to claim 1, it is characterised in that：The photodetection mould
Block includes the 2nd single-mode optical-fibre coupler (109), the 1st fibre delay line being connected with the 2nd single-mode optical-fibre coupler (109)
(201) and the 2nd fibre delay line (202), the height being connected with the 1st fibre delay line (201) and the 2nd fibre delay line (202)
Speed balance photodetector (203)；
The coupling ratio of the 2nd single-mode optical-fibre coupler (109) is 50:50；
The three dB bandwidth frequency of the adjustment of balance photodetector (203) is more than tested microwave signal frequency.
7. a kind of ultra wide band phase noise measuring system according to claim 6, it is characterised in that：1st optical fiber prolongs
Slow line (201) includes photoswitch 1, and the fiber optic loop 1 and fiber optic loop 2 being connected with photoswitch 1 are connected with fiber optic loop 1 and fiber optic loop 2
Photoswitch 2.
8. a kind of ultra wide band phase noise measuring system according to claim 7, it is characterised in that：The fiber optic loop 1
Length is 5 kms, and the length of fiber optic loop 2 is 300~500 meters.
9. a kind of ultra wide band phase noise measuring system according to claim 6, it is characterised in that：2nd optical fiber prolongs
Slow line (202) is automatically controlled fibre delay line, and its length is not more than 10 millimeters.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115801120A (en) * | 2022-11-15 | 2023-03-14 | 苏州大学 | Microwave source phase noise measuring device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115801120A (en) * | 2022-11-15 | 2023-03-14 | 苏州大学 | Microwave source phase noise measuring device and method |
| CN115801120B (en) * | 2022-11-15 | 2023-09-22 | 苏州大学 | Microwave source phase noise measuring device and method |
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