CN109039476A - Vector microwave signal generation system based on optical-electronic oscillator - Google Patents
Vector microwave signal generation system based on optical-electronic oscillator Download PDFInfo
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- CN109039476A CN109039476A CN201810834778.0A CN201810834778A CN109039476A CN 109039476 A CN109039476 A CN 109039476A CN 201810834778 A CN201810834778 A CN 201810834778A CN 109039476 A CN109039476 A CN 109039476A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/70—Photonic quantum communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
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Abstract
The present invention provides a kind of vector microwave signal generation system and method based on optical-electronic oscillator, it include: tunable laser, first phase modulator, second phase modulator, light notch filter, optical fiber, photodetector, electric amplifier, power splitter and pattern generator, the delay that the time cycle of the pseudo-random binary sequence of input and microwave signal are transmitted one week in optical-electronic oscillator loop matches, so that the pseudo-random binary sequence in a cycle is stored in optical-electronic oscillator ring cavity simultaneously, realize mode locking optoelectronic oscillation, simultaneously, when pseudo-random binary sequence level translation moment, the phase of light carrier after first phase modulators modulatenThe phase of the microwave signal generated with optical-electronic oscillatorMeet conditionWhen, optical sideband relative to light notch filter recess without offset, meet the continual and steady oscillating condition of optical-electronic oscillator, to generate stable, the vector microwave signal of frequency-tunable.
Description
Technical field
The present invention relates to Microwave photonics field more particularly to a kind of vector microwave signal generations based on optical-electronic oscillator
System.
Background technique
Radiofrequency signal optical transport is a kind of technology that wireless signal is transmitted using optical fiber, given full play to fiber optic communication and
The advantage of wireless communication.Because it has many advantages, such as low transmission loss, big available bandwidth, avoids frequency congestion, electromagnetism interference,
A kind of new solution is provided for Future Broadband Access Network.In optical-fiber wireless network, many effective Vector Modulation formats,
Including amplitude-shift keying, phase-shift keying (PSK), frequency shift keying and quadrature amplitude modulation etc., these modulation can effectively improve spectrum utilization
Efficiency transmits more information under finite bandwidth to realize, effectively raises the message capacity of communication system, therefore vector
Modulation format obtains greatly concern and extensive research in recent years.
How to generate stable, high-frequency vector microwave signal is a great problem urgently to be resolved always.Due to electronics
The bandwidth bottleneck of component limits, and can not generate high-frequency signal based on electronic device using traditional,.In addition, just existing at present
Vector signal source for, by the inner with the limitation of modulator, so the frequency generated generally will not be too high, general 6GHz is left
It is right.
Optical-electronic oscillator is considered as the effective ways that high-quality microwave signal generates, and this method is mainly using fusion light
The composite resonant cavity principle of signal and electric signal generates the microwave signal of low phase noise, can effectively reduce phase noise and obtain
Obtain the microwave letter of better quality.
Stable in order to generate, the vector microwave signal of high frequency, the invention proposes a kind of arrows based on optical-electronic oscillator
Microwave signal generation system is measured, pseudo-random binary sequence is modulated on light carrier, then passes through optical-electronic oscillator stable oscillation stationary vibration
Phase-modulated information of the pseudo-random binary sequence to light carrier is passed to optoelectronic oscillation through looped cycle oscillation by condition limitation
The microwave signal that device generates, realizes the generation of stable, frequency-tunable vector microwave signal.
Summary of the invention
(1) technical problems to be solved
Problem in view of the prior art, the present invention provide a kind of vector microwave signal generation system based on optical-electronic oscillator
And method, the wavelength using the modulating characteristic of phase-modulator, the filtering characteristic of light notch filter, tunable laser are quick
Performance occurs for the microwave of tunable characteristic and optical-electronic oscillator, generates stable, the vector microwave signal of frequency-tunable, solves
It has determined due to the limitation with modulator in the limitation of electronic component bandwidth bottleneck and existing vector signal source and high frequency can not be generated
The problem of signal.
(2) technical solution
The present invention provides a kind of vector microwave signal generation system based on optical-electronic oscillator, comprising: tunable laser
1, first phase modulator 2, second phase modulator 3, light notch filter 4, optical fiber 5, photodetector 6, electric amplifier 7,
Power splitter 8 and pattern generator 9.
Its course of work are as follows: tunable laser 1 exports light carrier to first phase modulator 2, modulates through first phase
The output of device 2 is to second phase modulator 3, and power splitter 8 exports electric signal to second phase modulator 3, and second phase modulator 3 is right
The signal that first phase modulator 2 and power splitter 8 input is modulated and exports light carrier and positive and negative single order sideband to light trap
Filter 4, light notch filter 4 filter out a single order sideband in the positive and negative single order sideband, light notch filter 4 are filtered out
Optical signal afterwards is input to photodetector 6 by optical fiber 5, and it is micro- that the optical signal of 6 pairs of photodetector inputs carries out processing generation
Wave signal, and microwave signal is exported to electric amplifier 7 and is amplified, the amplified signal of electric amplifier 7 is exported to function point
Device 8, the signal of input is divided into two-way by power splitter 8, and will wherein be input to second phase modulator 3 all the way, through second phase
The modulated signal of modulator 3 successively passes through light notch filter 4, optical fiber 5, photodetector 6, electric amplifier 7, power splitter 8,
Second phase modulator 3 forms looped cycle oscillation, and by constantly recycling, finally tend towards stability oscillation, and photodetector 6 generates
Stability microwave signal.
At this point, pattern generator 9 exports pseudo-random binary sequence to first phase modulator 2, first phase modulator 2
Pseudo-random binary sequence is modulated on the light carrier that tunable laser 1 exports and the phase of the light carrier is adjusted
System exports the optical signal after first phase modulator 2 is adjusted to second phase modulator 3, and second phase modulator 3 exports
Light carrier and positive and negative single order sideband are to light notch filter 4, when light notch filter 4 filters out a single order of the positive and negative single order in
Band, and the optical phase information that pseudo-random binary sequence is modulated is passed into remaining single order sideband, through looped cycle, will be left
Single order sideband and light carrier be transmitted to photodetector 6, photodetector 6 effect under, light carrier and single order sideband beat frequency
To generate vector microwave signal, vector microwave signal is exported after being stated electric amplifier 7 by power splitter 8.
Optionally, tunable laser 1, second phase modulator 3, light notch filter 4, optical fiber 5, photodetector 6,
Electric amplifier 7 and power splitter 8 constitute the optical-electronic oscillator for generating microwave signal.
Optionally, the microwave signal that the period of time T of pseudo-random binary sequence and optical-electronic oscillator generate is shaken in photoelectricity
Swing the delay Tr transmitted one week in device loop and meet optical-electronic oscillator stable oscillation stationary vibration condition: nT=Tr, n are positive integer.
Optionally, the phase through the modulated light carrier of first phase modulator 2nThe microwave generated with optical-electronic oscillator
The phase of signalMeet condition
Optionally, pattern generator 9 has the pseudo-random binary sequence of different coding properties to be modulated on light carrier,
To generate the vector microwave signal of different coding.
Optionally, tunable laser 1 is the laser of tunable wave length.
The present invention provides a kind of production method of vector microwave signal, comprising: tunable laser 1 exports light carrier to the
One phase-modulator 2, through the output of first phase modulator 2 to second phase modulator 3, power splitter 8 exports electric signal to second
Phase-modulator 3, the signal that second phase modulator 3 inputs first phase modulator 2 and power splitter 8 are modulated, export
To light notch filter 4, light notch filter 4 filters out one in the positive and negative single order sideband for light carrier and positive and negative single order sideband
Single order sideband, the optical signal after light notch filter 4 is filtered out are input to photodetector 6, photodetector 6 by optical fiber 5
Processing is carried out to the optical signal of input and generates microwave signal, and microwave signal is exported to electric amplifier 7 and is amplified, electricity is put
The big amplified signal of device 7 is exported to power splitter 8, and the signal of input is divided into two-way by power splitter 8, and will be wherein input to all the way
Second phase modulator 3 successively passes through light notch filter 4, optical fiber 5, photoelectricity through the modulated signal of second phase modulator 3
Detector 6, electric amplifier 7, power splitter 8, second phase modulator 3 form looped cycle oscillation, it is final constantly to be recycled oscillation
Tend towards stability oscillation, and photodetector 6 generates stable microwave signal；At this point, pattern generator 9 exports pseudo-random binary sequence
To first phase modulator 2, pseudo-random binary sequence is modulated at tunable laser 1 and exported column by first phase modulator 2
Light carrier on and the phase of the light carrier is modulated, by the optical signal after first phase modulator 2 is adjusted to export to
Second phase modulator 3, second phase modulator 3 export light carrier and positive and negative single order sideband to light notch filter 4, light trap
Filter 4 filters out one of single order sideband and the optical phase information that pseudo-random binary sequence is modulated is passed to remaining one
Single order sideband and light carrier are transmitted to photodetector 6 through looped cycle by rank sideband, under the effect of photodetector 6, light
To generate vector microwave signal, vector microwave signal is defeated by power splitter 8 after being stated electric amplifier 7 for carrier wave and single order sideband beat frequency
Out.
Optionally, tunable laser 1, second phase modulator 3, light notch filter 4, optical fiber 5, photodetector 3,
Electric amplifier 7 and power splitter 8 constitute optical-electronic oscillator, generate microwave signal.
Optionally, pattern generator 9 exports pseudo-random binary sequence to first phase modulator 2, comprising: passes through adjusting
Pattern generator 9, so that the microwave signal that the period of time T of pseudo-random binary sequence and optical-electronic oscillator generate is in the light
The delay Tr transmitted one week in electrical oscillator loop meets the optical-electronic oscillator stable oscillation stationary vibration condition: nT=Tr, n are positive whole
Number.
Optionally, the phase through the modulated light carrier of the first phase modulator 2nIt is produced with the optical-electronic oscillator
The phase of raw microwave signalCondition need to be met
(3) beneficial effect
The present invention provides a kind of vector microwave signal generation system based on optical-electronic oscillator and method, pattern generator are defeated
The time cycle of the pseudo-random binary sequence entered transmits one week delay phase with microwave signal in optical-electronic oscillator loop
Match, so that the pseudo-random binary sequence in a cycle is stored in optical-electronic oscillator ring cavity simultaneously, therefore, the same period
Interior pseudo-random binary code does not need to realize mode locking optical-electronic oscillator by noise starting of oscillation again, guarantees optical-electronic oscillator oscillation
Stability, meanwhile, the phase of the modulated light carrier of first phase modulator 2nBelieve with the microwave that optical-electronic oscillator generates
Number phaseMeet conditionIn the moment of pseudo noise code level translation, optical sideband is with respect to light notch filter
Recess is without offset, so that optical-electronic oscillator systems stay stable oscillation stationary vibration, to generate stable vector microwave signal.
In addition, wavelength of the frequency for the microwave signal that optical-electronic oscillator generates by tunable laser and light notch filter
Difference determines, therefore can realize that the vector microwave signal of any centre frequency generates.In addition, the coding of generated vector signal is special
Property can be controlled by pattern generator, therefore can produce the vector microwave signal of different coding properties.
Detailed description of the invention
Fig. 1 is a kind of structural representation of vector microwave signal generation system based on optical-electronic oscillator provided by the invention
Figure.
Appended drawing reference:
1- tunable laser；2- first phase modulator；
3- second phase modulator；4- light notch filter；
5- optical fiber；6- photodetector；
7- electric amplifier；8- power splitter；
9- pattern generator
Fig. 2 is generation vector microwave signal schematic diagram provided by the invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and referring to attached
Figure, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit the disclosure
Range.In the following detailed description, for convenient for explain, elaborate many concrete details to provide to the embodiment of the present disclosure
Comprehensive understanding.It may be evident, however, that one or more embodiments can also be carried out without these specific details.
In addition, in the following description, descriptions of well-known structures and technologies are omitted, to avoid the general of the disclosure is unnecessarily obscured
It reads.
Term as used herein is not intended to limit the disclosure just for the sake of description specific embodiment.It uses herein
The terms "include", "comprise" etc. show the presence of the feature, step, operation and/or component, but it is not excluded that in the presence of
Or add other one or more features, step, operation or component.
The present invention provides a kind of vector microwave signal generation system based on optical-electronic oscillator, as shown in Figure 1, specific packet
It includes: tunable laser 1, first phase modulator 2, second phase modulator 3, light notch filter 4, optical fiber 5, photodetection
Device 6, electric amplifier 7, power splitter 8 and pattern generator 9, the course of work can be regarded as:
When pattern generator 9 does not go out output signal, the light carrier that tunable laser 1 exports passes through first phase tune
Phase change does not occur for device 2 processed, and first phase-modulator 2 is equivalent to optical transmission medium at this time.In this case, tunable
Laser 1, phase-modulator 3, light notch filter 4, optical fiber 5, photodetector 6, electric amplifier 7 and power splitter 8 constitute
One adjustable optical-electronic oscillator system of output microwave signal frequency.
The light carrier that tunable laser 1 exports enters second phase tune through optical transmission medium first phase modulator 2
Device 3 processed, meanwhile, the electric signal that loop self-oscillation generates is input to second phase modulator 3, second phase modulation through power splitter 8
Device 3 export it is modulated after optical signal, which includes light carrier and positive and negative single order sideband, and two single order side band phases are poor
180 degree, according to the square filtering characteristic of photodetector 6, the optical signal that second phase modulator 3 exports at this time passes through optical fiber 5
Stable microwave signal cannot then be generated by being directly inputted to photodetector 6, i.e. optical-electronic oscillator is unable to stable oscillation stationary vibration, therefore,
Light notch filter 4 is added, between second phase modulator 3 and optical fiber 5 to filter out the light of second phase-modulator 3 output
A single order sideband in signal then can use the generation that photodetector 6 realizes microwave signal.
When optical-electronic oscillator is recycled and vibrated, pattern generator 9 exports pseudo-random binary sequence to first phase and modulates
Device 2, through first phase modulator 2, the light carrier after first phase modulator 2 exists the light carrier that tunable laser 1 exports
Pseudo-random binary sequence level change moment generates phase change, shows as optical frequency offset, optical signal is input to second
After phase-modulator 3, the single order sideband of the optical signal of output will deviate from the notch location of light notch filter 4 spectrally, this
When, the positive and negative single order sideband of light carrier and two phase phase difference 180 degrees exists simultaneously, when through loop transfer band photodetector 6
Required microwave signal cannot be generated, i.e. optical-electronic oscillator loop is unable to steady operation.
And when the phase of the microwave signal of optical-electronic oscillator self-oscillation generation and first phase modulator 2 are exported to the second phase
When the optical signal phase of position modulator 3 is opposite, two signals export after the modulation of second phase modulator 3, then can guarantee defeated
One single order sideband of optical signal out is still within the notch location of light notch filter 4, and optical-electronic oscillator system can at this time
To guarantee continual and steady oscillation, therefore, in the case where pattern generator 9 exports pseudo-random binary sequence, first is utilized
Phase-modulator 2 modulates the phase for the light carrier that tunable laser 1 exports, and makes modulated by first phase modulator 2
The phase for the microwave signal that the phase of light carrier and optical-electronic oscillator self-oscillation generate meets conditionSo, it is pseudo- with
Machine binary sequence low and high level converts moment, the recess of a single order sideband of the optical signal of output with respect to light notch filter
Place is without offset, so that optical-electronic oscillator systems stay stable oscillation stationary vibration, principle is as shown in Fig. 2, at this point, light notch filter 4 filters out
A single order sideband in the positive and negative single order sideband of second phase modulator input, and the light that pseudo-random binary sequence is modulated
Phase information, which passes to, filters out rear remaining single order sideband, and through looped cycle, remaining single order sideband and light carrier are transmitted to
The photodetector 6, under the photodetector 6 effect, light carrier and single order sideband beat frequency are to generate vector microwave
Signal.
Wherein, tunable laser 1, phase-modulator 2, phase-modulator 3, light notch filter 4, optical fiber 5, photoelectricity are visited
It surveys between device 6 and is connected by optical patchcord, such data are propagated in the form of non-electrical signal in optical patchcord by optical signal, institute
The influence such as external electromagnetic field, pulse noise or cross-talk is not will receive with system.Photodetector 6, electric amplifier 7, power splitter 8,
By cable connection between phase-modulator 3, pass through cable connection between phase-modulator 2 and pattern generator 9.
Wherein, optical fiber 5 is high-Q microwave energy-storage travelling wave tube, and the length is several meters to arrive tens of kms.
Wherein, tunable laser 1 is the semiconductor laser device of tunable wave length, by adjusting tunable laser 1
With the wavelength difference of light notch filter 4, the frequency for the microwave signal that optical-electronic oscillator generates is adjusted, to realize any center frequency
The generation of the vector microwave signal of rate.
Wherein, the time cycle of the pseudo-random binary sequence generated by pattern generator 9 and optical-electronic oscillator generate
The delay transmitted one week in optical-electronic oscillator loop of microwave signal match, that is, meet optical-electronic oscillator stable oscillation stationary vibration item
Part: (n is positive integer to nT=Tr, and T is the time cycle of pseudo-random binary sequence, and Tr is microwave signal in optical-electronic oscillator ring
Delay in one week is transmitted in road), by this adjusting, the pseudo-random binary sequence in a cycle is stored in photoelectricity vibration simultaneously
It swings in device ring cavity, therefore, the pseudo-random binary code in the same period does not need then again by noise starting of oscillation, to realize lock
Mould optical-electronic oscillator, vibrates optical-electronic oscillator continually and steadily, ensure that the generation of stable vector microwave signal.
In addition, the encoding characteristics of generated vector signal can be controlled by pattern generator 9, therefore it can produce different coding
The vector microwave signal of characteristic
Based on a kind of vector microwave signal generation system based on optical-electronic oscillator for above stating description, another party of the present invention
Face proposes a kind of production method of vector microwave signal, tunable laser 1, second phase modulator 3, light notch filter
4, optical fiber 5, photodetector 6, electric amplifier 7 and power splitter 8 constitute optical-electronic oscillator, generate microwave signal, method particularly includes:
S101, the output light carrier of tunable laser 1 to first phase modulator 2 are straight through the first phase modulator 2
Output is connect to second phase modulator 3, power splitter 8 exports electric signal to the second phase modulator 3, the second phase tune
The signal that device 3 processed inputs the first phase modulator 2 and the power splitter 8 is modulated output light carrier and positive and negative single order
Sideband is to light notch filter 4；
S102, the smooth notch filter 4 filter out a single order sideband in the positive and negative single order sideband, the light are fallen into
Treated the optical signal of wave filter 4 is input to photodetector 6, the light letter of 6 pairs of photodetector inputs by optical fiber 5
It number carries out processing and generates microwave signal, and the microwave signal is exported to electric amplifier 7 and is amplified, by the electric amplifier
7 amplified signals are exported to power splitter 8, and the signal of input is divided into two-way by the power splitter 8, and will be wherein input to all the way
The second phase modulator 3 successively passes through the smooth notch filter through the modulated signal of the second phase modulator 3
4, the optical fiber 5, the photodetector 6, the electric amplifier 7, the power splitter 8, the formation of second phase modulator 3
Looped cycle oscillation, the photodetector 6 generate required microwave signal；
S103, at this point, pattern generator 9 exports pseudo-random binary sequence to the first phase modulator 2, described the
The pseudo-random binary sequence is modulated on the light carrier that the tunable laser 1 exports and should by one phase-modulator 2
The phase of light carrier is modulated, and the optical signal after the first phase modulator 2 is adjusted to is exported to the second phase
Modulator 3, the signal that second phase modulator 3 inputs first phase modulator 2 and power splitter 8 is modulated and output light carries
To the smooth notch filter 4, light notch filter 4 filters out one in the positive and negative single order sideband of the puppet for wave and positive and negative single order sideband
The optical phase information that pseudo-random binary sequence is modulated simultaneously is passed to remaining single order sideband by a single order sideband, is followed through loop
Remaining single order sideband and the light carrier are transmitted to the photodetector 6 by ring, under the photodetector 6 effect,
To generate vector microwave signal, the vector microwave signal is amplified through the electric amplifier 7 for light carrier and single order sideband beat frequency
It is exported afterwards by the power splitter 8.
It should be understood that the above-mentioned definition to each element and method is not limited in the various tools mentioned in embodiment
Body structure, shape or mode, those skilled in the art can replace with simply being known to its structure, such as: can incite somebody to action
Electric amplifier replaces with image intensifer in system, and with photodetector transposition, amplifying conversion to microwave signal
To amplify to light carrier；It can be by the location swap of power splitter and electric amplifier；Light notch filter can be replaced with to other can be real
Existing equivalent function element；Optical-electronic oscillator can be used commonly uses twin nuclei to improve the stability of system.Also, appended is attached
Figure is to simplify and used as illustrating.Number of devices, shape and size shown in the drawings can be repaired according to actual conditions
Change, and the configuration of device is likely more complexity.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (10)
1. a kind of vector microwave signal generation system, comprising:
Tunable laser (1), first phase modulator (2), second phase modulator (3), light notch filter (4), optical fiber
(5), photodetector (6), electric amplifier (7), power splitter (8) and pattern generator (9)；
Tunable laser (1) the output light carrier is to the first phase modulator (2), through the first phase modulator
(2) it is directly output to the second phase modulator (3), power splitter (8) output electric signal to the second phase is modulated
Device (3), the signal that the second phase modulator (3) inputs the first phase modulator (2) and the power splitter (8) into
Row is modulated and exports light carrier and positive and negative single order sideband to the smooth notch filter (4), and the smooth notch filter (4) filters out
A single order sideband in the positive and negative single order sideband, the optical signal after the smooth notch filter (4) is filtered out pass through described
Optical fiber (5) is input to the photodetector (6), and it is micro- that the photodetector (6) carries out processing generation to the optical signal of input
Wave signal, and the microwave signal is exported to the electric amplifier (7) and is amplified, after the electric amplifier (7) amplification
Signal export to the power splitter (8) and be divided into two-way, the power splitter (8) will wherein be input to the second phase tune all the way
Device (3) processed successively passes through the smooth notch filter (4), the light through the modulated signal of the second phase modulator (3)
Fine (5), the photodetector (6), the electric amplifier (7), the power splitter (8), second phase modulator (3) shape
It is vibrated at looped cycle；
At this point, the pattern generator (9) exports pseudo-random binary sequence to the first phase modulator (2), described the
The pseudo-random binary sequence is modulated on the light carrier of the tunable laser (1) output by one phase-modulator (2)
And the phase of the light carrier is modulated, it will export through the modulated optical signal of the first phase modulator (2) to described
Second phase modulator (3), the second phase modulator (3) is to the first phase modulator (2) and the power splitter (8)
The signal of input is modulated and exports light carrier and positive and negative single order sideband to the smooth notch filter (4), the smooth trap
Filter (4) filters out a single order sideband in the positive and negative single order sideband, and the pseudo-random binary sequence is modulated
Optical phase information passes to remaining single order sideband, and through looped cycle, remaining single order sideband and the light carrier are transmitted to
The photodetector (6), under the photodetector (6) effect, the light carrier and the single order sideband beat frequency to
Vector microwave signal is generated, the vector microwave signal is exported after the electric amplifier (7) by the power splitter (8).
2. system according to claim 1, which is characterized in that tunable laser (1), second phase modulator (3), light
Notch filter (4), optical fiber (5), photodetector (6), electric amplifier (7) and power splitter (8), which are constituted, generates microwave signal
Optical-electronic oscillator.
3. system according to claim 2, which is characterized in that the period of time T of the pseudo-random binary sequence and institute
The microwave signal for stating optical-electronic oscillator generation transmits one week delay T in the optical-electronic oscillator looprMeet the photoelectricity
Oscillator stabilization oscillating condition: nT=Tr, n is positive integer.
4. system according to claim 2, which is characterized in that carried through the modulated light of the first phase modulator (2)
The phase of wavenThe phase of the microwave signal generated with the optical-electronic oscillatorMeet condition
5. system according to claim 1, which is characterized in that the pattern generator (9) generates different coding properties
Pseudo-random binary sequence is modulated on light carrier, to generate the vector microwave signal of different coding.
6. system according to claim 1, which is characterized in that the tunable laser (1) is swashing for tunable wave length
Light device.
7. a kind of production method of vector microwave signal, comprising:
S1, tunable laser (1) output light carrier to first phase modulator (2) are straight through the first phase modulator (2)
Output is connect to second phase modulator (3), power splitter 8 exports electric signal to the second phase modulator (3), second phase
The signal that position modulator (3) inputs the first phase modulator (2) and the power splitter (8) is modulated and output light carries
Wave and positive and negative single order sideband are to light notch filter (4)；
S2, the smooth notch filter (4) filter out a single order sideband in the positive and negative single order sideband, and the smooth trap is filtered
Wave device (4) treated optical signal is input to photodetector (6) by optical fiber (5), and the photodetector (6) is to input
Optical signal carries out processing and generates microwave signal, and the microwave signal is exported to electric amplifier (7) and is amplified, by the electricity
Amplifier (7) amplified signal, which is exported to power splitter (8), is divided into two-way, and the power splitter (8) will wherein be input to institute all the way
Second phase modulator (3) are stated, successively pass through the smooth notch filter through the modulated signal of the second phase modulator (3)
Device (4), the optical fiber (5), the photodetector (6), the electric amplifier (7), the power splitter (8), second phase
Position modulator (3) forms looped cycle oscillation；
S3, pattern generator (9) export pseudo-random binary sequence to the first phase modulator (2), the first phase
The pseudo-random binary sequence is modulated on the light carrier of the tunable laser (1) output and to light by modulator (2)
The phase of carrier wave is modulated, and will be exported through the modulated optical signal of the first phase modulator (2) to the second phase
Modulator (3), the second phase modulator (3) output light carrier and positive and negative single order sideband to the smooth notch filter (4),
The smooth notch filter (4) filters out a single order sideband in the positive and negative single order side, and by the pseudo-random binary sequence
The optical phase information of column modulation passes to remaining single order sideband, through looped cycle, by the single order sideband and the light carrier
The photodetector (6) are transmitted to, under the photodetector (6) effect, the light carrier and the single order sideband are clapped
Frequency is to generate vector microwave signal, and the vector microwave signal is after the electric amplifier (7) amplify by the power splitter (8)
Output.
8. according to the method described in claim 8, it is characterized in that, utilizing tunable laser (1), second phase modulator
(3), the photoelectricity vibration that light notch filter (4), optical fiber (5), photodetector (6), electric amplifier (7) and power splitter (8) are constituted
It swings device and generates microwave signal.
9. according to the method described in claim 8, it is characterized in that, in the operation S3, pattern generator (9) output it is pseudo- with
Machine binary sequence is to the first phase modulator (2), comprising: the period of time T of the pseudo-random binary sequence and institute
The microwave signal for stating optical-electronic oscillator generation transmits one week delay T in the optical-electronic oscillator looprMeet the photoelectricity
Oscillator stabilization oscillating condition: nT=Tr, n is positive integer.
10. according to the method described in claim 8, it is characterized in that, being carried through the modulated light of the first phase modulator (2)
The phase of wavenThe phase of the microwave signal generated with the optical-electronic oscillatorMeet condition
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| CN111077519A (en) * | 2020-01-15 | 2020-04-28 | 中国人民解放军空军预警学院 | Microwave photon radar implementation method and system |
| CN111834864A (en) * | 2020-07-07 | 2020-10-27 | 电子科技大学 | Phase modulation and optical filtering-based photoelectric oscillator |
| CN113965271A (en) * | 2021-11-02 | 2022-01-21 | 中国人民解放军空军预警学院 | Oscillator implementation system based on microwave photon technology |
| CN114460562A (en) * | 2022-01-21 | 2022-05-10 | 杭州光预科技有限公司 | Radar signal generation system based on injection locking Fourier mode locking optoelectronic oscillator |
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