CN106959388A - A kind of microwave frequency measuring method and device based on optical frequency com - Google Patents
A kind of microwave frequency measuring method and device based on optical frequency com Download PDFInfo
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- CN106959388A CN106959388A CN201710169669.7A CN201710169669A CN106959388A CN 106959388 A CN106959388 A CN 106959388A CN 201710169669 A CN201710169669 A CN 201710169669A CN 106959388 A CN106959388 A CN 106959388A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
- G01R23/14—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by heterodyning; by beat-frequency comparison
- G01R23/145—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by heterodyning; by beat-frequency comparison by heterodyning or by beat-frequency comparison with the harmonic of an oscillator
Abstract
The invention provides a kind of microwave frequency measuring method and device based on optical frequency com, belong to microwave frequency measuring method and engineering device technique field.The method of the present invention, it is f to produce frequency by lasercLaser signal be divided into two parts, a portion is f by frequencyRFUnknown RF signals Double Sideband Suppressed Carrier modulation is carried out to it；Double Sideband Suppressed Carrier modulated signal carries out beat frequency with off resonance frequency comb on an arrowband photodetector；The frequency spectrum of beat signal is analyzed, the frequency information and power information of the two goods to auction signals is obtained；According to fixed i, f1, f2, and formula (7) is the frequency that can determine that incident RF signal.The inventive system comprises laser, the first coupler, intensity modulator, programmable filter, erbium-doped fiber amplifier, double-parallel modulator, signal generator, electrical couplers, phase-shifter, photodetector, frequency spectrograph, the second coupler, the 3rd coupler and the 4th coupler.
Description
Technical field
The present invention relates to a kind of microwave frequency measuring method and device based on optical frequency com, belong to microwave frequency measurement
Method and device technical field.
Background technology
It is how at present in a great problem of photonic propulsion microwave frequency fields of measurement in the range of big frequency measurement to micro-
Ripple signal frequency carries out high-acruracy survey.The frequency range that conventional microwave power reflection method is generally possible within 20GHz is entered
Line frequency is measured, but it can only be measured to the frequency of simple signal, and measurement accuracy is uneven；Channel method frequency is surveyed
Amount can be realized carries out frequency measurement in the larger context, but its measurement accuracy is only in GHz magnitudes；Scanning method can compared with
The High Precision Frequency of large-scale multi-frequency microwave signal, but its poor real, it is impossible to carry out the measurement of instantaneous frequency.
The content of the invention
The invention aims to solve the problem of above-mentioned prior art is present, and then provide a kind of based on optical frequency
The microwave frequency measuring method and device of comb.
The purpose of the present invention is achieved through the following technical solutions：
A kind of microwave frequency measuring method based on optical frequency com, step is as follows：
Step 1: it is f to produce frequency by lasercLaser signal be divided into two parts, a portion is f by frequencyRF
Unknown RF signals Double Sideband Suppressed Carrier modulation is carried out to it, the signal light field approximate representation after modulation is
Eu(t)=E0sin[βcos(2πfRFt)]≈A+1cos[2π(fc+fRF)t]+A-1cos[2π(fc-fRF)t] (1)
Wherein A±1=J1(β) is the amplitude of Double Sideband Suppressed Carrier modulated signal light field, β=π/VπAnd Jn() is respectively phase
Modulation rate and first kind n rank Bessel functions, VπIt is the half-wave voltage of Mach-Zehnder modulators, another part is used to produce
Off resonance optical frequency com, making every broach of optical frequency com has different appropriate power, and its light field is expressed as
Wherein n is the number of broach in off resonance optical frequency com, BiIt is the light field of i-th of broach in off resonance optical frequency com
Amplitude,It is the frequency of first broach in the relative phase difference between i-th of broach and first broach, off resonance optical frequency com
It is identical with the frequency of carrier wave in Double Sideband Suppressed Carrier modulated signal；
Step 2: Double Sideband Suppressed Carrier modulated signal is clapped with off resonance frequency comb on an arrowband photodetector
Frequently, the upper side band of Double Sideband Suppressed Carrier signal is expressed as with i-th of broach beat signal light intensity in off-resonance frequency comb
If the difference on the frequency of the upper side band of Double Sideband Suppressed Carrier signal and i-th of broach is in the bandwidth of photodetector
It is interior, i.e., 0≤| fRF-(i-1)f0|≤f0When, the exchange of photodetector is output as
WhereinFor the responsiveness of photodetector, this beat signal contains frequency and is | fRF-(i-1)f0| letter
Number, otherwise, photodetector will be not responding to due to finite bandwidth, therefore, between upper side band and its left and right most adjacent fingers
Beat signal frequency is within photodetector respective range, and the frequency of produced microwave frequency component is respectively f1、f2, and
Beat signal frequency between upper side band and its non-left and right most adjacent fingers is not in the respective range of photodetector, by photoelectricity
Detector is filtered, and the frequency of the beat signal between each broach of off resonance optical frequency com is optical frequency com frequency f0Integer
Times, therefore, in the case where single-frequency RF signals are incident, only frequency is f in the respective range of photodetector1、f2Two bat
Frequency signal；
Step 3: analyzing the frequency spectrum of beat signal, the frequency information and power letter of the two goods to auction signals are obtained
Breath, is found out by formula (4), and the power ratio between the upper side band of unknown RF signals and its most adjacent left and right broach is expressed as
Wherein PiFor the power of i-th of broach in off resonance optical frequency com, it is notable that if upper side band is located at the
Between 1 and the 2nd broach, then the bat between the upper side band and lower sideband of Double Sideband Suppressed Carrier signal and the 1st broach
The frequency of frequency signal is equal, and this will cause the power of beat signal between upper side band and the 1st broach to turn into original 4
Times.Therefore, formula (5) is written as
Found out by formula (6), power ratios of the power ratio R only between adjacent fingers in off-resonance frequency comb is relevant, presses down with carrier wave
The upper side band of double-sideband signal processed is unrelated with the amplitude of lower sideband, and also the power with incident RF signal is unrelated, so, by clapping
Power in the power information obtained in frequency signal spectral analysis and the off resonance optical frequency com determined between each adjacent fingers
Than can determine that i；
Step 4: according to fixed i, f1, f2, and formula (7) is the frequency that can determine that incident RF signal
fRF=(i-1) f0+f1=if0-f2 (7)
The frequency measurement of multiple-frequency signal is realized using this method, in multifrequency measurement process, in analysis beat signal
After frequency spectrum, the frequency of the frequency interval comprising two microwave frequency components and their frequency and for off resonance optical frequency com is picked out
Rate pair, then, the frequency of each RF signal frequency component are obtained according to the frequency information of corresponding frequencies pair with power information.
A kind of microwave frequency measurement apparatus based on optical frequency com, including：Laser, the first coupler, intensity modulated
Device, programmable filter, erbium-doped fiber amplifier, double-parallel modulator, signal generator, electrical couplers, phase-shifter, photoelectricity
Detector, frequency spectrograph, the second coupler, the 3rd coupler and the 4th coupler, one end of the laser and the first coupler
One end be connected, the 3rd coupler and the 4th coupler are connected in series, the other end of the first coupler respectively with intensity modulated
One end of device, one end of the 3rd coupler are connected, and the other end of intensity modulator is connected with one end of the second coupler, the
Programmable filter, the other end of the second coupler and the one of photodetector are serially connected between two couplers and the 4th coupler
End is connected, and the other end of photodetector is connected with frequency spectrograph, one end of the 3rd coupler and erbium-doped fiber amplifier
One end is connected, and the other end of erbium-doped fiber amplifier is connected with the first end of double-parallel modulator, double-parallel modulator
Second end is connected with one end of the 4th coupler, and the 3rd end of double-parallel modulator is connected with one end of phase-shifter, double flat
4th end of row modulator and the other end of phase-shifter are connected with one end of electrical couplers, the other end of electrical couplers
It is connected with signal generator.
Beneficial effects of the present invention：
1st, the frequency measurement of high-frequency microwave signal can be realized using narrowband optical, electricity, optoelectronics device.
2nd, compared with based on microwave frequency measuring methods such as channel method, power monitoring methods, the frequency error measurement of this method
Small, Measurement Resolution is high.
Brief description of the drawings
Fig. 1 is the microwave frequency measuring method schematic diagram based on optical frequency com.
Fig. 2 is the structural representation of the microwave frequency measurement apparatus of the invention based on optical frequency com.
Reference in Fig. 2,1 is laser, and 2 be the first coupler, and 3 be intensity modulator, and 4 be programmable filter
Device, 5 be erbium-doped fiber amplifier, and 6 be double-parallel modulator, and 7 be signal generator, and 8 be electrical couplers, and 9 be phase-shifter, 10
It is frequency spectrograph for photodetector, 11,12 be the second coupler, and 13 be the 3rd coupler, and 14 be the 4th coupler.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail：The present embodiment using technical solution of the present invention as
Under the premise of implemented, give detailed embodiment, but protection scope of the present invention is not limited to following embodiments.
As shown in figure 1, a kind of microwave frequency measuring method based on optical frequency com involved by the present embodiment, step is such as
Under：
Step 1: it is f to produce frequency by lasercLaser signal be divided into two parts, a portion is f by frequencyRF
Unknown RF signals Double Sideband Suppressed Carrier modulation is carried out to it, the signal light field approximate representation after modulation is：
Eu(t)=E0sin[βcos(2πfRFt)]≈A+1cos[2π(fc+fRF)t]+A-1cos[2π(fc-fRF)t] (1)
Wherein A±1=J1(β) is the amplitude of Double Sideband Suppressed Carrier modulated signal light field, β=π/VπAnd Jn() is respectively
Phase-modulation rate and first kind n rank Bessel functions, VπIt is the half-wave voltage of Mach-Zehnder modulators.Another part is used for
Produce off resonance optical frequency com, make optical frequency com every broach have different appropriate power (adjacent two broach it
Between power ratio it is different, and determined finish), its light field is expressed as
Wherein n is the number of broach in off resonance optical frequency com, BiIt is the light field of i-th of broach in off resonance optical frequency com
Amplitude,It is i-th of broach and first broachBetween relative phase difference.First comb in off resonance optical frequency com
The frequency of tooth is identical with the frequency of carrier wave in Double Sideband Suppressed Carrier modulated signal.
Step 2: Double Sideband Suppressed Carrier modulated signal with off resonance frequency comb in an arrowband photodetector (with a width of
DC-f0) on carry out beat frequency.The upper side band of Double Sideband Suppressed Carrier signal and i-th of broach beat signal light in off-resonance frequency comb
It is represented by by force
If the difference on the frequency of the upper side band of Double Sideband Suppressed Carrier signal and i-th of broach is in the bandwidth of photodetector
It is interior, i.e., 0≤| fRF-(i-1)f0|≤f0When, the exchange of photodetector is output as
WhereinFor the responsiveness of photodetector.This beat signal contains frequency | fRF-(i-1)f0| letter
Number.Otherwise, photodetector will be not responding to due to finite bandwidth.Therefore, between upper side band and its left and right most adjacent fingers
Beat signal frequency is within photodetector respective range, and the frequency of produced microwave frequency component is respectively f1、f2.And
Beat signal frequency between upper side band and its non-left and right most adjacent fingers is not in the respective range of photodetector, by photoelectricity
Detector is filtered.The frequency of beat signal between each broach of off resonance optical frequency com is optical frequency com frequency f0Integer
Times.Therefore, in the case where single-frequency RF signals are incident, only frequency is f in the respective range of photodetector1、f2Two bat
Frequency signal (the two beat signals claim frequency pair, its frequency and the frequency interval for off resonance optical frequency com).
Step 3: analyzing the frequency spectrum of beat signal, the frequency information and power letter of the two goods to auction signals are obtained
Breath.Power ratio between the upper side band of unknown RF signals it can be seen from formula (4) and its most adjacent left and right broach can be represented
For
Wherein PiFor the power of i-th of broach in off resonance optical frequency com.If it is worth noting that, upper side band is located at the
(i.e. 0≤f between 1 and the 2nd broachRF≤f0), then the upper side band and lower sideband of Double Sideband Suppressed Carrier signal and the 1st
The frequency of beat signal between broach is equal, and this will cause the power of beat signal between upper side band and the 1st broach
As original 4 times.Therefore, formula (5) should be rewritten as
It is relevant by power ratios of the power ratio R it can be seen from formula (6) only between adjacent fingers in off-resonance frequency comb, with load
The upper side band that ripple suppresses double-sideband signal is unrelated with the amplitude of lower sideband, and the power also with incident RF signal is unrelated.So, pass through
To between each adjacent fingers in the power information obtained in beat signal spectrum analysis and the off resonance optical frequency com determined
Power ratio is that can determine that i.
Step 4: according to fixed i, f1, f2, and formula (7) is the frequency that can determine that incident RF signal
fRF=(i-1) f0+f1=if0-f2 (7)
The frequency measurement of multiple-frequency signal can use this method to realize.In multifrequency measurement process, in analysis beat frequency letter
Number frequency spectrum after, pick out comprising two microwave frequency components and their frequency and for off resonance optical frequency com frequency interval
Frequency pair.Then, the frequency of each RF signal frequency component can be according to the frequency information and power of corresponding frequencies pair
Information acquisition.
It should be noted that in frequency measuring process, if there is frequency in incident RF signal in 0-f0/ 2 component,
The beat signal frequency of its lower sideband is within the respective range of photodetector；In multiple-frequency signal frequency measuring process,
Issuable beat signal is also in the corresponding model of photodetector between the upper side band of each frequency component of incident RF signal
Within enclosing, but these beat signals individually occur, and can not find corresponding signal and constitute frequency pair, therefore this therewith
A little signals do not interfere with frequency measurement.
As shown in Fig. 2 a kind of microwave frequency measurement apparatus based on optical frequency com involved by the present embodiment, including：
Laser 1, the first coupler 2, intensity modulator 3, programmable filter 4, erbium-doped fiber amplifier 5, double-parallel modulator 6,
Signal generator 7, electrical couplers 8, phase-shifter 9, photodetector 10, frequency spectrograph 11, the second coupler 12, the 3rd coupler
13 and the 4th coupler 14, one end of the laser 1 is connected with one end of the first coupler 2, the 3rd coupler 13 and
Four couplers 14 are connected in series, the other end of the first coupler 2 one end respectively with intensity modulator 3, the 3rd coupler 13
One end is connected, and the other end of intensity modulator 3 is connected with one end of the second coupler 12, the second coupler 12 and the 4th coupling
Programmable filter 4 is serially connected between clutch 14, the other end of the second coupler 12 is connected with one end of photodetector 10,
The other end of photodetector 10 is connected with frequency spectrograph 11, one end of the 3rd coupler 13 and the one of erbium-doped fiber amplifier 5
End is connected, and the other end of erbium-doped fiber amplifier 5 is connected with the first end of double-parallel modulator 6, double-parallel modulator 6
Second end is connected with one end of the 4th coupler 14, and the 3rd end of double-parallel modulator 6 is connected with one end of phase-shifter 9,
The one end of 4th end of double-parallel modulator 6 and the other end of phase-shifter 9 with electrical couplers 8 is connected, electrical couplers 8
The other end be connected with signal generator 7.
The function of laser 1：Produce narrow linewidth continuous laser signal.
First coupler 2, the second coupler 12, the function of the 3rd coupler 13 and the 4th coupler 14：Light beam is believed
Number it is divided into two-beam signal, or two-beam signal is synthesized into a branch of optical signal.
The function of intensity modulator 3：Carrier-suppressed SSB modulation is carried out to optical signal.
The function of programmable filter 4：The power of every broach in the optical frequency com of generation is adjusted.
The function of erbium-doped fiber amplifier 5：Optical signal is amplified.
The function of double-parallel modulator 6：Carrier-suppressed SSB modulation is carried out to optical signal, the frequency to optical signal is realized
Move.
The function of signal generator 7：Produce the microwave signal of fixed frequency.
The function of electrical couplers 8：One electric signal is divided into two electric signals.
The function of phase-shifter 9：Realize relative phase delay of the electric signal with respect to another electric signal.
The function of photodetector 10：Double Sideband Suppressed Carrier signal is combed in the detector upper beat frequency with off-resonance frequency, will
Optical signal is converted to electric signal.
The function of frequency spectrograph 11：The frequency spectrum of beat signal is analyzed.
The foregoing is intended to be a preferred embodiment of the present invention, and these embodiments are all based on the present invention
Different implementations under general idea, and protection scope of the present invention is not limited thereto, it is any to be familiar with the art
Technical staff the invention discloses technical scope in, the change or replacement that can be readily occurred in, should all cover the present invention
Within protection domain.Therefore, protection scope of the present invention should be defined by the protection domain of claims.
Claims (2)
1. a kind of microwave frequency measuring method based on optical frequency com, it is characterised in that
Step 1: it is f to produce frequency by lasercLaser signal be divided into two parts, a portion is f by frequencyRFNot
Know that RF signals carry out Double Sideband Suppressed Carrier modulation to it, the signal light field approximate representation after modulation is
Eu(t)=E0sin[βcos(2πfRFt)]≈A+1cos[2π(fc+fRF)t]+A-1cos[2π(fc-fRF)t] (1)
Wherein A±1=J1(β) is the amplitude of Double Sideband Suppressed Carrier modulated signal light field, β=π/VπAnd Jn() is respectively that phase is adjusted
Rate and the first kind n rank Bessel functions processed, VπIt is the half-wave voltage of Mach-Zehnder modulators, another part is used to produce mistake
Humorous optical frequency com, making every broach of optical frequency com has different appropriate power, and its light field is expressed as
Wherein n is the number of broach in off resonance optical frequency com, BiIt is the light field amplitude of i-th of broach in off resonance optical frequency com,It is the frequency and load of first broach in the relative phase difference between i-th of broach and first broach, off resonance optical frequency com
The frequency that ripple suppresses carrier wave in double sideband modulation signal is identical；
Step 2: Double Sideband Suppressed Carrier modulated signal carries out beat frequency with off resonance frequency comb on an arrowband photodetector,
I-th of broach beat signal light intensity is expressed as during the upper side band of Double Sideband Suppressed Carrier signal is combed with off-resonance frequency
If the difference on the frequency of the upper side band of Double Sideband Suppressed Carrier signal and i-th of broach is in the bandwidth of photodetector, i.e., 0
≤|fRF-(i-1)f0|≤f0When, the exchange of photodetector is output as
WhereinFor the responsiveness of photodetector, this beat signal contains frequency and is | fRF-(i-1)f0| signal, it is no
Then, photodetector will be not responding to due to finite bandwidth, therefore, and the beat frequency between upper side band and its left and right most adjacent fingers is believed
Number frequency is within photodetector respective range, and the frequency of produced microwave frequency component is respectively f1、f2, and upper side band
Beat signal frequency between its non-left and right most adjacent fingers is not in the respective range of photodetector, by photodetector
Filter, the frequency of the beat signal between each broach of off resonance optical frequency com is optical frequency com frequency f0Integral multiple, because
This, in the case where single-frequency RF signals are incident, only frequency is f in the respective range of photodetector1、f2Two beat frequencies letter
Number；
Step 3: analyzing the frequency spectrum of beat signal, the frequency information and power information of the two goods to auction signals are obtained, by
Formula (4) finds out, the power ratio between the upper side band of unknown RF signals and its most adjacent left and right broach is expressed as
Wherein PiFor the power of i-th of broach in off resonance optical frequency com, it is notable that if upper side band be located at the 1st with
Between 2nd broach, then the beat signal between the upper side band and lower sideband of Double Sideband Suppressed Carrier signal and the 1st broach
Frequency be equal, this will cause the power of beat signal between upper side band and the 1st broach to turn into original 4 times, therefore,
Formula (5) is written as
Found out by formula (6), power ratios of the power ratio R only between adjacent fingers in off-resonance frequency comb is relevant, suppress double with carrier wave
The upper side band of sideband signals is unrelated with the amplitude of lower sideband, and also the power with incident RF signal is unrelated, so, by believing beat frequency
Power ratio in number spectrum analysis in the power information obtained and the off resonance optical frequency com determined between each adjacent fingers is i.e.
It can determine that i；
Step 4: according to fixed i, f1, f2, and formula (7) is the frequency that can determine that incident RF signal
fRF=(i-1) f0+f1=if0-f2 (7)
The frequency measurement of multiple-frequency signal is realized using this method, in multifrequency measurement process, in the frequency spectrum of analysis beat signal
Afterwards, the frequency of the frequency interval comprising two microwave frequency components and their frequency and for off resonance optical frequency com is picked out
Right, then, the frequency of each RF signal frequency component is obtained according to the frequency information of corresponding frequencies pair with power information.
2. the device that a kind of microwave frequency measuring method of claim 1 based on optical frequency com is used, it is characterised in that bag
Include：It is laser (1), the first coupler (2), intensity modulator (3), programmable filter (4), erbium-doped fiber amplifier (5), double
Parallel modulator (6), signal generator (7), electrical couplers (8), phase-shifter (9), photodetector (10), frequency spectrograph
(11), the second coupler (12), the 3rd coupler (13) and the 4th coupler (14), one end and first of the laser (1)
One end of coupler (2) is connected, and the 3rd coupler (13) and the 4th coupler (14) are connected in series, the first coupler (2)
Other end one end respectively with intensity modulator (3), one end of the 3rd coupler (13) are connected, intensity modulator (3) it is another
One end is connected with the one end of the second coupler (12), is serially connected with and can compile between the second coupler (12) and the 4th coupler (14)
Range filter (4), the other end of the second coupler (12) is connected with one end of photodetector (10), photodetector (10)
The other end be connected with frequency spectrograph (11), one end of the 3rd coupler (13) is connected with one end of erbium-doped fiber amplifier (5)
Connect, the other end of erbium-doped fiber amplifier (5) is connected with the first end of double-parallel modulator (6), double-parallel modulator (6)
Second end is connected with one end of the 4th coupler (14), the 3rd end of double-parallel modulator (6) and one end phase of phase-shifter (9)
Connection, the one end of the 4th end of double-parallel modulator (6) and the other end of phase-shifter (9) with electrical couplers (8) is connected,
The other end of electrical couplers (8) is connected with signal generator (7).
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| CN110702985B (en) * | 2018-07-09 | 2020-07-07 | 中国科学院半导体研究所 | Beat frequency type frequency spectrum detecting system |
| CN110943777A (en) * | 2019-12-05 | 2020-03-31 | 中国科学院半导体研究所 | Frequency measurement equipment based on frequency conversion technology |
| CN110943777B (en) * | 2019-12-05 | 2021-04-06 | 中国科学院半导体研究所 | Frequency measurement equipment based on frequency conversion technology |
| CN111175574A (en) * | 2020-01-02 | 2020-05-19 | 中国科学院半导体研究所 | Measuring system and measuring method |
| CN113483878A (en) * | 2021-06-18 | 2021-10-08 | 中国科学院上海技术物理研究所 | Micro Doppler vibration measurement system and method based on bidirectional acousto-optic frequency comb |
| CN113483878B (en) * | 2021-06-18 | 2022-03-29 | 中国科学院上海技术物理研究所 | Micro Doppler vibration measurement system and method based on bidirectional acousto-optic frequency comb |
| CN113759172A (en) * | 2021-08-26 | 2021-12-07 | 上海交通大学 | Broadband and real-time microwave photon frequency measuring device and method based on microwave frequency comb |
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