CN109842444A - Infant laser signal detection amplification system and method based on optical-electronic oscillator - Google Patents
Infant laser signal detection amplification system and method based on optical-electronic oscillator Download PDFInfo
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- CN109842444A CN109842444A CN201910181961.XA CN201910181961A CN109842444A CN 109842444 A CN109842444 A CN 109842444A CN 201910181961 A CN201910181961 A CN 201910181961A CN 109842444 A CN109842444 A CN 109842444A
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Abstract
The present invention provides a kind of infant laser signal detection amplification system and its detection amplification method based on optical-electronic oscillator, belong to Microwave photonics technical field.The infant laser signal detection amplification system based on optical-electronic oscillator, comprising: laser, beam splitter, phase-modulator, highly nonlinear optical fiber, circulator, photodetector, power splitter, coupler, electric amplifier, intensity modulator, adjustable optical attenuator and radio frequency source；Laser is connect with beam splitter, and beam splitter is connect with phase-modulator and intensity modulator respectively again, phase-modulator, circulator, photodetector, power splitter, coupler and electric amplifier be sequentially connected from head to tail to form loop；Intensity modulator, adjustable optical attenuator and circulator are sequentially connected, and radio frequency source is connected in intensity modulator, and phase-modulator and circulator are connected by highly nonlinear optical fiber.Quick, high-precision infant laser signal detection amplification may be implemented by adjusting radio frequency source and adjustable optical attenuator in the present invention.
Description
Technical field
The present invention relates to Microwave photonics technical fields more particularly to a kind of infant laser signal detection based on optical-electronic oscillator to put
Big system and method.
Background technique
Fast frequency measuring plays increasing effect in the systems such as radar and electronic station, but fast frequency is surveyed
The premise of amount is that system can tell the signal received, especially to the detection of weak signal, therefore, can to weak signal into
The high-power detection amplification of line width frequency band is particularly important.It is directed to detection and the scale-up problem of weak signal, the electronics at it solves
In scheme, very narrow filter and amplifier are used, but because the noise that technology development and electric amplifier introduce makes
The realization for obtaining this scheme is particularly difficult.Microwave photonics method, because its big bandwidth for having, low-loss are anti-interference etc. excellent
Point, and used by more people.But in existing method, the OEO based on injection locking process is intracavitary without electric bandpass filter
Multimode photodetector carry out weak signal scheme, can only to the signal in 1~6GHz frequency range amplify 8dB, detection spirit
Sensitivity has reached -83dBm, there is a problem of that the frequency range of detection is smaller and amplification effect is also not apparent；Based on Bradley
The tunable photoelectric sensor system of lattice grating carries out the scheme of radiofrequency signal detection amplification, can be to 1.5~5GHz frequency model
Signal amplification 10dB in enclosing, detectivity have reached -91dBm, and the measurement error of look-in frequency has reached 100MHz, but
Being that the frequency range that this method can detect is limited by grating only has 5.5GHz, and this method uses and loses phase tune
Scheme of the single order sideband of system to realize the conversion from phase-modulation to intensity modulated to realize the amplification to weak signal,
Theoretically there is amplification bottlenecks.
In addition to this, often complicated and changeable in specific environment, the weak signal received is frequently not single-frequency
The signal of narrowband, often there are also the signal even multiple-frequency signals of wide bandwidth, how also effectively to be detected simultaneously to these
And amplification is also an extremely important problem.
Summary of the invention
(1) technical problems to be solved
The present invention, which opens, provides a kind of infant laser signal detection amplification system and method based on optical-electronic oscillator, at least partly
Solve technical problem set forth above.
(2) technical solution
According to an aspect of the invention, there is provided a kind of infant laser signal detection amplification system based on optical-electronic oscillator, packet
Include: laser (1), beam splitter (2), phase-modulator (3), highly nonlinear optical fiber (4), circulator (5), photodetector (7),
Power splitter (8), coupler (9), electric amplifier (10), intensity modulator (11), adjustable optical attenuator (12) and radio frequency source
(13)；
The laser (1) connect with the beam splitter (2), the beam splitter (2) again respectively with the phase-modulator
(3) with intensity modulator (11) connect, the phase-modulator (3), circulator (5), photodetector (7), power splitter (8),
Coupler (9) and electric amplifier (10) are sequentially connected from head to tail to form loop, the intensity modulator (11), adjustable optical attenuator
(12) and circulator (5) is sequentially connected, and the radio frequency source (13) is connected on the intensity modulator (11), and the height is non-thread
Property optical fiber (4) is connected between the phase-modulator (3) and circulator (5).
In some embodiments, the beam splitter (2) is used to the optical signal that the laser (1) issues being divided into two
Point, a part of optical signal and received weak signal pass through the positive single order sideband and negative one rank side that the phase-modulator (3) obtain
Band, the microwave signal issued with another part optical signal and the radio frequency source (13) obtain bilateral by intensity modulator (11)
With pump light when the loss spectra and gain spectral of the stimulated Brillouin scattering that highly nonlinear optical fiber (4) generates are overlapped, the reception
Weak signal i.e. be resumed.
In some embodiments, connected between the laser (1), beam splitter (2) and phase-modulator (3) by optical fiber
It connects；It is connect between the circulator (5) and photodetector (8) by optical fiber；The beam splitter (2), intensity modulator (11),
It is connected between adjustable optical attenuator (12), circulator (5) by optical fiber.
In some embodiments, the photodetector (7), power splitter (8), coupler (9), electric amplifier (10), phase
Pass through cable connection between position modulator (3) and between the radio frequency source (13) and intensity modulator (11).
In some embodiments, the laser (1) is narrow linewidth single wavelength laser.
In some embodiments, the laser (1), beam splitter (2), phase-modulator (3), highly nonlinear optical fiber (4),
Circulator (5), photodetector (7), intensity modulator (11) and radio frequency source (13) collectively constitute a microwave photon filtering
Device；The passband of the microwave photon filter is determined by the laser (1) and gain spectral or the wavelength difference of loss spectra.
In some embodiments, the period of change of the microwave photon filter and signal the phase-modulator (3),
Highly nonlinear optical fiber (4), circulator (5), photodetector (7), power splitter (8), coupler (9) and electric amplifier (10) shape
At loop in the delay transmitted one week match, meet Fourier mode locking condition:
NT=Tr
Wherein n is positive integer, and T is the period of change of the microwave photon filter, and Tr is that signal passes in the loop
Defeated delay in one week.
In some embodiments, the phase-modulator (3), highly nonlinear optical fiber (4), circulator (5), photodetector
(7), the dispersion for the loop that power splitter (8), coupler (9) and electric amplifier (10) are formed is zero, so that the letter of different frequency
Number delay having the same in the loop.
In some embodiments, the system also includes erbium-doped fiber amplifiers；The erbium-doped fiber amplifier is connected to
Between the circulator (5) and the photodetector (7), the optical signal for exporting to the circulator (5) is amplified.
According to another aspect of the present invention, it provides a kind of provided based on optical-electronic oscillator using above-described embodiment
Infant laser signal detection amplification system infant laser signal detection amplification method, which comprises
Laser (1) issues optical signal and is divided into two parts through beam splitter (2), and a part is transmitted to phase-modulator (3), separately
A part is transmitted to intensity modulator (11)；
Radio frequency source (13) issues microwave signal transmission to intensity modulator (11)；
The optical signal carries out carrier suppressed modulation by the microwave source signal in intensity modulator (11), generates two
Single order sideband is transmitted to adjustable optical attenuator (12) as pump light；
Adjustable optical attenuator (12) is adjusted the power of the pump light and passes through circulator (5) for the pump light
Be transmitted to highly nonlinear optical fiber (4) generate stimulated Brillouin scattering and the loss spectra that is distributed at left and right sides of the pump light and
Gain spectral；
Weak signal is transmitted to phase-modulator (3) by coupler (8) electric amplifier (10)；
Phase-modulation is carried out by the weak signal in the phase-modulator (3) optical signal, positive single order is generated and bears
Two sidebands of single order enter the highly nonlinear optical fiber (4)；
Negative one rank sideband described in the gain spectral gain that the pump light described in the highly nonlinear optical fiber (4) generates, loss
The positive single order sideband is lost in spectrum, and the optical signals phase-modulation is made to be converted into intensity modulated, after obtaining gain and loss
New optical signal is transmitted to photodetector (7) beat frequency by circulator (5)；
The new optical signal is converted to electric signal by the photodetector (7), sends power splitter (8) to；
The power splitter (8) feeds back to phase-modulator after coupling electric signal output with the weak signal received and penetrates
Frequency port；
Frequency by analyzing the power of the electric signal of power splitter (8) output, after obtaining the small signals amplification.
(3) beneficial effect
It can be seen from the above technical proposal that the present invention at least has the advantages that one of them or in which one
Point:
(1) the infant laser signal detection amplification system and method provided by the invention based on optical-electronic oscillator, by using frequency
Can quickly continuous tuning radio frequency source, issue periodically variable microwave signal so that this system may be implemented single-frequency microwave letter
Number, the high speed detection of wide-band microwave signal and multiple-frequency signal keeps the investigative range of the system bigger；
(2) the infant laser signal detection amplification system and method provided by the invention based on optical-electronic oscillator is dissipated by Brillouin
The optical signal that the microwave signal and laser that the gain characteristic having and radio frequency source for penetrating gain spectral issue issue is by intensity
Two single order sidebands that modulators modulate generates can more effectively improve optical-electronic oscillator pair as pump light, double-side band pumping
The gain effect of weak signal；
(3) the infant laser signal detection amplification system and method provided by the invention based on optical-electronic oscillator is dissipated by Brillouin
The selection characteristic that gain spectral (loss spectra) has is penetrated, realizes and detects weak signal in more complicated detection environment；
(4) the infant laser signal detection amplification system and method provided by the invention based on optical-electronic oscillator, using sideband conduct
Pump light, so that it is only for avoiding signal light and pump light all there is fixed phase relation between signal light and pump light
Vertical light source and the case where cause the wave length shift of pump light to generate error, the detection of available weak signal degree of precision.
Detailed description of the invention
Fig. 1 is the structural representation of the infant laser signal detection amplification system provided in an embodiment of the present invention based on optical-electronic oscillator
Figure；
Fig. 2 is the flow chart of the infant laser signal detection amplification method provided in an embodiment of the present invention based on optical-electronic oscillator；
Fig. 3 A is the result schematic diagram of phase-modulator phase-modulation provided in an embodiment of the present invention；
Fig. 3 B is the result schematic diagram of intensity modulator carrier suppressed modulation provided in an embodiment of the present invention；
Fig. 3 C is the schematic diagram of the microwave photon filter provided in an embodiment of the present invention based on stimulated Brillouin scattering.
In above-mentioned attached drawing, appended drawing reference meaning is specific as follows:
1- laser；2- beam splitter；3- phase-modulator；4- highly nonlinear optical fiber；5- circulator；6- Erbium-doped fiber amplifier
Device；7- photodetector；8- power splitter；9- coupler；10- electric amplifier；11- intensity modulator；12- adjustable optical attenuator；
13- radio frequency source.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in further detail.
According to an aspect of the invention, there is provided a kind of infant laser signal detection amplification system based on optical-electronic oscillator, such as
Shown in Fig. 1, Fig. 1 is the structural representation of the infant laser signal detection amplification system provided in an embodiment of the present invention based on optical-electronic oscillator
Figure, being somebody's turn to do the infant laser signal detection amplification system based on optical-electronic oscillator includes:
Laser 1, beam splitter 2, phase-modulator 3, highly nonlinear optical fiber 4, circulator 5, photodetector 7, power splitter
8, coupler 9, electric amplifier 10, intensity modulator 11, adjustable optical attenuator 12 and radio frequency source 13, in which:
Laser 1 is connect with beam splitter 2, and a port of beam splitter 2 is connect with phase-modulator 3, beam splitter 2 it is another
A port is connect with intensity modulator 11, phase-modulator 3, circulator 5, photodetector 7, power splitter 8, coupler 9 and
Electric amplifier 10 is sequentially connected from head to tail to form loop；Intensity modulator 11, adjustable optical attenuator 12 and circulator 5 successively connect
It connects；Radio frequency source 13 is connected in the intensity modulator 11；Highly nonlinear optical fiber 4 be connected to phase-modulator 3 and circulator 5 it
Between.
In the present embodiment, between laser 1, beam splitter 2 and phase-modulator 3 by optical fiber connect, circulator 5 with
Connected between photodetector 8 by optical fiber, beam splitter 2, intensity modulator 11, adjustable optical attenuator 12, between circulator 5
It is connected by optical fiber；Photodetector 7, power splitter 8, coupler 9, electric amplifier 10, between phase-modulator 3 and radio frequency source
Pass through cable connection between 13 and intensity modulator 10.
In the present embodiment, weak signal is often referred to the signal that power is lower than 0dB.
In the present embodiment, beam splitter 2 is used to the optical signal that laser 1 issues being divided into two parts, a part of optical signal
Pass through the positive single order sideband and negative one rank sideband that the phase-modulator 3 obtains with received weak signal, believes with another part light
Number and the double-side band pump light that obtains by intensity modulator 11 of the microwave signal that issues of the radio frequency source 13 in high non-linearity light
When the loss spectra and gain spectral of the stimulated Brillouin scattering that fibre 4 generates are overlapped, received weak signal is resumed.
Specifically, the positive single order that a part of optical signal obtains after the weak signal modulation that phase-modulator 3 is received
Sideband and negative one rank sideband, another part optical signal are carried out by the microwave signal that intensity modulator is issued by the radio frequency source 13
After carrier suppressed modulation, two obtained single order sidebands enter the generation excited Brillouin of highly nonlinear optical fiber 4 as pump light and dissipate
Penetrate, in highly nonlinear optical fiber 4, when two pump lights generate stimulated Brillouin scattering loss spectra and gain spectral just with phase
When single order sideband obtained in the modulator of position is overlapped, then conversion of the light carrier from phase-modulation to intensity modulated is realized, is connect
The weak signal received is resumed.Wherein, laser 1 is narrow linewidth single wavelength laser；Radio frequency source 13 is that frequency can quickly connect
Continuous to adjust radio frequency source, highly nonlinear optical fiber 4 is the high-Q microwave energy-storage travelling wave tube with optical nonlinearity, and the length is several meters to number
Ten kms.
In the present embodiment, adjustable optical attenuator 12 is big to the gain of sideband by the optical power control of control pump light
It is small, so that weak signal be made to obtain detection and amplification.Adjustable optical attenuator 12 is also connected to highly nonlinear optical fiber 4 and circulator
Between 5.
Infant laser signal detection amplification system provided by the invention based on optical-electronic oscillator, can be quickly continuous by using frequency
The radio frequency source of tuning, the microwave signal of sending can be with cyclically-varyings, so wide-band microwave signal and more may be implemented in this system
The high speed of frequency signal detects, so that the investigative range of the system is bigger；It is special by the gain being had by Brillouin scattering gain spectral
Property and the optical signal that issues of laser the double-side band pumping that carrier suppressed modulation obtains is carried out by microwave signal that radio frequency source issues,
Optical-electronic oscillator can more effectively be improved to the gain effect of weak signal；By being had by Brillouin scattering gain spectral (loss spectra)
Some selection characteristics realize and detect weak signal in more complicated detection environment.
In the present embodiment, laser 1, beam splitter 2, phase-modulator 3, highly nonlinear optical fiber 4, circulator 5, photoelectricity are visited
It surveys device 7, intensity modulator 11 and radio frequency source 13 and collectively constitutes a microwave photon filter；The passband of microwave photon filter
Band is determined by the wavelength difference of frequency swept laser 1 and gain spectral or loss spectra.Wherein:
The period of change and signal of microwave photon filter are in phase-modulator 3, highly nonlinear optical fiber 4, circulator 5, light
The delay transmitted one week in the loop that electric explorer 7, power splitter 8, coupler 9 and electric amplifier 10 are formed matches, and meets
Fourier mode locking condition:
NT=Tr
Wherein n is positive integer, and T is the period of change of the microwave photon filter, and Tr is that signal passes in the loop
Defeated delay in one week.
In the present embodiment, phase-modulator 3, highly nonlinear optical fiber 4, circulator 5, photodetector 7, power splitter 8, coupling
The Dispersion managed for the loop that clutch 9 and electric amplifier 10 are formed is to zero, so that the signal of different frequency has in the loop
Identical delay.
In the present embodiment, being somebody's turn to do the infant laser signal detection amplification system based on optical-electronic oscillator can also include with Er-doped fiber
Amplifier 5 is connected between circulator 4 and photodetector 6, and the optical signal for exporting to circulator 4 amplifies.
In the present embodiment, power splitter 8 is used to photodetector 7 being divided into two by the electric signal that optical signal converts to beat
Point, for a part for exporting, another part, which is transmitted to coupler 9 and couples with weak signal, is transmitted to electric amplifier 10.
Infant laser signal detection amplification system provided by the invention based on optical-electronic oscillator is made using sideband as pump light
Between signal light and pump light there is fixed phase relation, to avoid signal light and pump light all be independent and is caused
The wave length shift of pump light generates the case where error, the detection of available weak signal degree of precision.
According to another aspect of the present invention, a kind of infant laser signal detection amplification method based on optical-electronic oscillator is proposed,
As shown in Fig. 2, the weak signal that Fig. 2 is the infant laser signal detection amplification system provided in an embodiment of the present invention based on optical-electronic oscillator is visited
Amplification method is surveyed, this method comprises the following steps:
Step S101, laser issue optical signals beam splitter and are divided into two parts, and a part is transmitted to phase-modulator, separately
A part is transmitted to intensity modulator.
Before step S101, this method further include: optical-electronic oscillator is adjusted to threshold status.
Step S102, radio frequency source issue microwave signal transmission to intensity modulator.
Preferably, the radio frequency source that radio frequency source can be continuously adjusted quickly for frequency, therefore the microwave signal of radio frequency source sending
Frequency is in cyclically-varying.
Step S103, optical signal carry out carrier suppressed modulation by microwave signal in intensity modulator, generate two single orders
Sideband is transmitted to adjustable optical attenuator as pump light.As shown in Fig. 3 B figure, Fig. 3 B is the carrier suppressed modulation of intensity modulator
Result schematic diagram.
The pump light of double-side band can preferably improve optical-electronic oscillator to the gain effect of weak signal.
Step S104, adjustable optical attenuator are adjusted the power of pump light and pass through circulator and be transmitted to pump light
Highly nonlinear optical fiber generates stimulated Brillouin scattering and obtains being distributed in loss spectra and gain spectral at left and right sides of pump light.
Specifically, pump light generates stimulated Brillouin scattering after exciting in highly nonlinear optical fiber, while distribution can be generated
Loss spectra and the gain spectral that bandwidth is about tens megahertzs at left and right sides of pump light.Wherein, pump light and excited Brillouin dissipate
Penetrate the gain spectral and the corresponding frequency phase-difference of loss spectra about 10GHz in area.
Step S105, weak signal are transmitted to phase-modulator prevention at radio-frequency port by coupler and electric amplifier.
Step S106, optical signal carries out phase-modulation by weak signal in phase-modulator, generates positive single order and negative one rank
Two sidebands enter highly nonlinear optical fiber.As shown in Figure 3A, Fig. 3 A is the modulation result schematic diagram of phase-modulator.
Step S107, the gain spectral gain negative one rank sideband that pump light generates in highly nonlinear optical fiber, loss spectra loss
Positive single order sideband, makes optical signals phase-modulation be converted into intensity modulated, and the new optical signal after gain and loss is passed through ring
Shape device is transmitted to photodetector beat frequency.The weak signal received at this time is resumed out.
Specifically, being made in optical-electronic oscillator by the centre frequency for the microwave that periodically quickly tuned radio frequency source issues
The delay that the period of change and signal of microwave photon filter transmit one week in optical-electronic oscillator loop matches, and meets in Fu
Leaf domain mode locking condition:
NT=Tr
Wherein, n is positive integer, and T is the period of change of microwave photon filter, and Tr is signal in optical-electronic oscillator loop
The delay of transmission one week.To realize Fourier mode locking optical-electronic oscillator, frequency sweep microwave signal can produce.In the process of frequency sweep
In when the gain spectral loss spectra by Brillouin scattering just be received weak signal phase-modulation after optical signal negative and positive
When single order sideband is overlapped, the gain spectral loss spectra of stimulated Brillouin scattering can the negative and positive that generates of gain loss phase modulator modulation
Single order sideband, the modulated signal after the spectrum loss of the gain spectral gain loss of stimulated Brillouin scattering are as shown in Figure 3 C.Positive and negative one
The size of rank sideband is no longer equal, the gain loss effect for controlling gain spectral loss spectra to sideband by adjusting adjustable optical attenuator
Fruit, therefore phase-modulation is converted to intensity modulated.
Infant laser signal detection amplification method provided by the invention based on optical-electronic oscillator, passes through Brillouin scattering gain spectral
The gain characteristic and double-side band having pump the gain effect that can more effectively improve optical-electronic oscillator to weak signal；It is logical
The selection characteristic that Brillouin scattering loss spectra has is crossed, realizes and detects weak signal in more complicated detection environment.
New optical signal is converted to electric signal, sends power splitter to by step S108, photodetector.
Step S109, power splitter export electric signal, and feed back to after being coupled by coupler with the weak signal received
Phase-modulator prevention at radio-frequency port.
Step S1010, the frequency by the power of the electric signal of analysis power splitter output, after obtaining small signals amplification.
Specifically, it is whether abnormal by the changed power of the swept-frequency signal of real-time monitoring system generation, when weak signal enters
Detected and amplified by system after system, at this time at this because have new signal generate and power ascension, by RF source frequencies and when
Between corresponding relationship can quickly obtain frequency size f, f '=f-f of corresponding radio frequency source at this time0Be we receive it is weak
The frequency of signal, wherein f0It is the size of Brillouin shift, usually 10GHz or so.
Infant laser signal detection amplification method provided by the invention based on optical-electronic oscillator can be quickly continuous by using frequency
The single-frequency received, multifrequency, broadband weak signal can be resumed and be amplified by the radio frequency source of tuning, so that the system
Investigative range is bigger；And because avoiding signal light and pump there is fixed phase relation between signal light and pump light
Pu light is all the case where wave length shift that is independent and leading to pump light generates error, the detection knot of available degree of precision
Fruit.
Further, due to not needing electric filter, microwave caused by loop in the optical-electronic oscillator loop of proposition
The frequency of signal is only dependent upon the emission wavelength of tunable laser and the difference of stimulated Brillouin scattering corresponding wavelength, therefore can
Realize the wide-band tuning of microwave signal.
In addition, the above-mentioned definition to each element and method be not limited in the various specific structures mentioned in embodiment,
Shape or mode, those skilled in the art can replace with simply being known to its structure, such as: can pump two
What light generated does not filter out the two other gain spectral loss spectra of filtering generation effect, only with a line band as pumping
Light, electric amplifier, which changes, provides gain to entire loop for fiber amplifier；Also it is directly added into image intensifer in the optical path to letter
It number amplifies, increases an optoisolator between phase-modulator and high non-linearity light.Also, appended attached drawing is letter
Changed and was used as illustrating.Number of devices, shape and size shown in the drawings can modify according to actual conditions, and device
The configuration of part is likely more complexity.
It should be noted that ordinal number such as " first ", " second ", " third " etc. used in specification and claim
Word, to modify corresponding element, itself simultaneously unexpectedly contains and represents the element and have any ordinal number, does not also represent certain unitary
The sequence or the sequence in manufacturing method of part and another element, the use of those ordinal numbers are only used to make one with certain name
Element is able to that clear differentiation can be made with another element with identical name.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe 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 protection of the invention
Within the scope of.
Claims (10)
1. a kind of infant laser signal detection amplification system based on optical-electronic oscillator characterized by comprising
Laser (1), beam splitter (2), phase-modulator (3), highly nonlinear optical fiber (4), circulator (5), photodetector
(7), power splitter (8), coupler (9), electric amplifier (10), intensity modulator (11), adjustable optical attenuator (12) and radio frequency
Source (13)；
The laser (1) connect with the beam splitter (2), the beam splitter (2) again respectively with the phase-modulator (3) and
Intensity modulator (11) connection, the phase-modulator (3), circulator (5), photodetector (7), power splitter (8), coupler
(9) and electric amplifier (10) is sequentially connected from head to tail to form loop, the intensity modulator (11), adjustable optical attenuator (12) with
And circulator (5) is sequentially connected, the radio frequency source (13) is connected on the intensity modulator (11), the highly nonlinear optical fiber
(4) it is connected between the phase-modulator (3) and circulator (5).
2. the infant laser signal detection amplification system according to claim 1 based on optical-electronic oscillator, which is characterized in that described point
The optical signal that the laser (1) issues is divided into two parts by beam device (2), and a part of optical signal and received weak signal pass through institute
The positive single order sideband and negative one rank sideband that phase-modulator (3) obtains are stated, with another part optical signal and the radio frequency source (13)
The double-side band pump light that the microwave signal of sending is obtained by intensity modulator (11) generated in highly nonlinear optical fiber (4) by
When the loss spectra and gain spectral for swashing Brillouin scattering are overlapped, the received weak signal is resumed.
3. the infant laser signal detection amplification system according to claim 1 based on optical-electronic oscillator, which is characterized in that described to swash
It is connected between light device (1), beam splitter (2) and phase-modulator (3) by optical fiber；The circulator (5) and photodetector
(8) it is connected between by optical fiber；The beam splitter (2), intensity modulator (11), adjustable optical attenuator (12), circulator (5) it
Between pass through optical fiber connect.
4. the infant laser signal detection amplification system according to claim 1 based on optical-electronic oscillator, which is characterized in that the light
Electric explorer (7), power splitter (8), coupler (9), electric amplifier (10), between phase-modulator (3) and the radio frequency source
(13) pass through cable connection between intensity modulator (11).
5. the infant laser signal detection amplification system according to claim 1 based on optical-electronic oscillator, which is characterized in that described to swash
Light device (1) is narrow linewidth single wavelength laser.
6. the infant laser signal detection amplification system according to claim 1 based on optical-electronic oscillator, which is characterized in that described to swash
Light device (1), beam splitter (2), phase-modulator (3), highly nonlinear optical fiber (4), circulator (5), photodetector (7), intensity
Modulator (11) and radio frequency source (13) collectively constitute a microwave photon filter；The passband of the microwave photon filter
It is determined by the laser (1) and gain spectral or the wavelength difference of loss spectra.
7. the infant laser signal detection amplification system according to claim 6 based on optical-electronic oscillator, which is characterized in that described micro-
The period of change and signal of glistening light of waves subfilter are in the phase-modulator (3), highly nonlinear optical fiber (4), circulator (5), light
One week delay phase is transmitted in the loop that electric explorer (7), power splitter (8), coupler (9) and electric amplifier (10) are formed
Match, meet Fourier mode locking condition:
NT=Tr
Wherein n is positive integer, and T is the period of change of the microwave photon filter, and Tr is that signal transmits one in the loop
The delay in week.
8. the infant laser signal detection amplification system according to claim 1 based on optical-electronic oscillator, which is characterized in that the phase
Position modulator (3), highly nonlinear optical fiber (4), circulator (5), photodetector (7), power splitter (8), coupler (9) and electricity
The dispersion for the loop that amplifier (10) is formed is zero, so that the delay having the same in the loop of the signal of different frequency.
9. the infant laser signal detection amplification system according to claim 1 based on optical-electronic oscillator, which is characterized in that the system
System further includes erbium-doped fiber amplifier；The erbium-doped fiber amplifier is connected to the circulator (5) and the photodetector
(7) between, the optical signal for exporting to the circulator (5) is amplified.
10. a kind of infant laser signal detection amplification system using described in any one of claims 1 to 9 based on optical-electronic oscillator
Infant laser signal detection amplification method, which is characterized in that the described method includes:
Laser (1) issues optical signal and is divided into two parts through beam splitter (2), and a part is transmitted to phase-modulator (3), another portion
Divide and is transmitted to intensity modulator (11)；
Radio frequency source (13) issues microwave signal transmission to intensity modulator (11)；
The optical signal carries out carrier suppressed modulation by the microwave source signal in intensity modulator (11), generates two single orders
Sideband is transmitted to adjustable optical attenuator (12) as pump light；
Adjustable optical attenuator (12) is adjusted the power of the pump light and passes through circulator (5) for the pumping optical transport
Stimulated Brillouin scattering is generated to highly nonlinear optical fiber (4) to obtain being distributed in the loss spectra at left and right sides of the pump light and gain
Spectrum；
Weak signal is transmitted to phase-modulator (3) by coupler (8) electric amplifier (10)；
Phase-modulation is carried out by the weak signal in the phase-modulator (3) optical signal, generates positive single order and negative one rank
Two sidebands enter the highly nonlinear optical fiber (4)；
Negative one rank sideband described in the gain spectral gain that the pump light described in the highly nonlinear optical fiber (4) generates, loss spectra damage
The positive single order sideband is consumed, the optical signals phase-modulation is made to be converted into intensity modulated, it is new after obtaining gain and loss
Optical signal is transmitted to photodetector (7) beat frequency by circulator (5)；
The new optical signal is converted to electric signal by the photodetector (7), sends power splitter (8) to；
The power splitter (8) feeds back to phase-modulator radio-frequency head after coupling electric signal output with the weak signal received
Mouthful；
Frequency by analyzing the power of the electric signal of power splitter (8) output, after obtaining the small signals amplification.
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