CN109687259A - Chaos optical-electronic oscillator and its chaotic signal producing method - Google Patents
Chaos optical-electronic oscillator and its chaotic signal producing method Download PDFInfo
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- CN109687259A CN109687259A CN201910144561.1A CN201910144561A CN109687259A CN 109687259 A CN109687259 A CN 109687259A CN 201910144561 A CN201910144561 A CN 201910144561A CN 109687259 A CN109687259 A CN 109687259A
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
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Abstract
The present invention provides the chaos optical-electronic oscillators and its chaotic signal producing method of a kind of variation of high speed, belong to Microwave photonics technical field.The chaos optical-electronic oscillator includes: frequency swept laser, phase-modulator, circulator, linearly chirped fiber Bragg grating, photodetector, electric amplifier and beam splitter；Straight line is interconnected to form between frequency swept laser, phase-modulator, circulator and photodetector；Linearly chirped fiber Bragg grating is connected on the circulator；A loop is interconnected to form between photodetector, electric amplifier, beam splitter and phase-modulator, pass through the conditions such as the power of signal in control route and polarization state, route can be made to enter chaos state to export chaotic signal, in conjunction with the periodically variable optical signal that frequency swept laser exports, the chaos optical-electronic oscillator is allowed to export the chaotic signal of high speed variation.
Description
Technical field
The present invention relates to Microwave photonics technical fields more particularly to a kind of chaos optical-electronic oscillator and its chaotic signal to produce
Generation method.
Background technique
Chaos is to be prevalent in one of natural society phenomenon, describe occur in a determining system not really
Fixed class random behavior is the entity of certainty and randomness.Really qualitative performance is generated by the system that determines at it chaos,
And it can be described with determining differential or difference equation；The randomness of chaos shows that its motion profile is unpredictable,
With noise like.
Common chaotic laser light producing method has very much, most typically generates chaos in turn based on semiconductor laser
Laser.Main guiding theory is to increase one degree of freedom, and then generate chaotic laser light.Main common methods include: outer
Light Semiconductor Lasers, the method for light feedback semiconductor laser and optical-electronic oscillator.Side about optical-electronic oscillator
Case, after related researcher is to the branch feathers research of Delay Feedback system, a variety of delay models are tested and Numerical-Mode
Quasi- research, the most typical one, that is, optical-electronic oscillator.Mainly divide about the direction studied at present using optical-electronic oscillator scheme
For two classes: 1, with optical-electronic oscillator generate the microwave signal of high-frequency and low phase noise, 2, be that generate chaos etc. non-linear
Dynamic behaviour.Many relevant researchers have carried out relevant research for the scheme for generating chaos using optical-electronic oscillator.
Someone uses nonlinear device of the MZ Mach-Zehnder as optical-electronic oscillator within 2004, is published within 05 year " Nature " report
It is applied optical-electronic oscillator as chaotic laser light generating device in the chaos light security network communication of extra long distance in road；
Four optical-electronic oscillators have accomplished synchronism output etc. in networks in 2013.
But chaotic laser light caused by existing optical-electronic oscillator is typically all the laser of fixed simple signal, with
The progress of science and technology, the fixation simple signal that existing optical-electronic oscillator generates and the application for being no longer satisfied reality, therefore,
In order to meet practical application, need to manufacture a kind of multi-frequency, the optical-electronic oscillator in broadband.
Summary of the invention
(1) technical problems to be solved
The present invention, which opens, provides a kind of chaos optical-electronic oscillator and its chaotic signal producing method, at least partly solve with
The technical issues of upper proposed.
(2) technical solution
According to an aspect of the invention, there is provided a kind of chaos optical-electronic oscillator characterized by comprising frequency sweep swashs
Light device (1), phase-modulator (2), circulator (4), linearly chirped fiber Bragg grating (5), photodetector (7), electricity are put
Big device (8) and beam splitter (9)；
Between the frequency swept laser (1), phase-modulator (2), circulator (4) and photodetector (7) mutually according to
Secondary connection, the linearly chirped fiber Bragg grating (5) are connected on the circulator (4)；, the photodetector (7),
Mutually successively simultaneously head and the tail connection forms loop between electric amplifier (8), beam splitter (9) and phase-modulator (2).
In some embodiments, the frequency swept laser (1), phase-modulator (2), circulator (4), photodetector
(7) it is connect by optical fiber between and between the linearly chirped fiber Bragg grating (5) and circulator (4)；, wherein institute
Stating the optical fiber connected between circulator (4) and the photodetector (7) is time delay optical fiber, and length is several meters or thousands of rice.
In some embodiments, the photodetector (7), electric amplifier (8), beam splitter (9) and phase-modulator
(2) pass through cable connection between.
In some embodiments, the frequency swept laser (1) is the frequency sweep semiconductor laser of electric current driving or is based on
The frequency swept laser of single sideband modulation；The emission wavelength of the frequency swept laser (1) is in cyclically-varying.
In some embodiments, the frequency swept laser (1), phase-modulator (2), linearly chirped fiber Bragg grating
(5), circulator (4) and photodetector (7) collectively constitute a microwave photon filter；The microwave photon filter
Passband is determined by the frequency swept laser (1) and the difference of linearly chirped fiber Bragg grating (5) reflectance spectrum.
In some embodiments, the period of change of the microwave photon filter and signal the photodetector (7),
The delay transmitted one week in the loop that electric amplifier (8), beam splitter (9) and phase-modulator (2) are formed matches, and meets Fu
In leaf domain 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 signal in the photodetection
Delay in one week is transmitted in the loop that device (7), electric amplifier (8), beam splitter (9) and phase-modulator (2) are formed.
In some embodiments, the photodetector (7), electric amplifier (8), beam splitter (9) and phase-modulator
(2) Dispersion managed of the loop formed is to zero, so that the delay having the same in the loop of the signal of different frequency.
In some embodiments, the chaos optical-electronic oscillator further includes optoisolator；The optoisolator is connected to institute
It states between phase regulator (2) and the circulator (4), for preventing optical signal from the circulator to the phase regulator
Direction transmission.
In some embodiments, the chaos optical-electronic oscillator further includes Polarization Controller；The Polarization Controller connection
Between the phase regulator (2) and the optoisolator or be connected to the optoisolator and the circulator (4) it
Between, for adjusting the polarization state of the chaos optical-electronic oscillator.
According to another aspect of the present invention, it provides a kind of using chaos optical-electronic oscillator provided by above-described embodiment
The method for generating chaotic signal, which comprises
Frequency swept laser (1) issues optical signal transmission to phase-modulator (2)；
After the phase-modulator (2) carries out phase-modulation to the optical signal, by Polarization Controller adjustment route
Polarization state, then linearly chirped fiber Bragg grating (5) are transmitted to through optoisolator；
The linearly chirped fiber Bragg grating (5) converts the optical signal of the phase-modulation to the light of intensity modulated
Signal is transmitted to photodetector (7) through time delay optical fiber by circulator (4)；
The optical signal of the intensity modulated is converted to electric signal by the photodetector (7), is transmitted to electric amplifier
(8)；
The electric amplifier (8) amplifies the electric signal, exports through beam splitter (9), and feed back to phase-modulator
(2)；
When feeding back to the intensity of electric signal of phase-modulator (2) and reaching preset threshold, photodetector (7), electricity are put
Chaotic signal is generated in the loop formed between device (8), beam splitter (9) and phase-modulator (2) greatly.
(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) chaos optical-electronic oscillator and its chaotic signal producing method provided by the invention, use phase-modulator and line
Property chirp light Bragg grating can control wide-band microwave photon filter in area of light, without further changing chaos light
Other assemblies in electrical oscillator route can adjust broadband chaotic dynamics state, effectively extend the bandwidth of chaotic laser light；
(2) chaos optical-electronic oscillator and its chaotic signal producing method provided by the invention, by controlling frequency swept laser
Laser power and polarization state controller control the polarization state of the chaos optical-electronic oscillator and carry out control chaotic optical-electronic oscillator line
The intensity of road feedback signal, in conjunction with the periodically variable emission wavelength that frequency swept laser issues, so that high speed variation is generated,
The chaotic laser light signal of different frequency；
(3) chaos optical-electronic oscillator and its chaotic signal producing method provided by the invention, by generating high speed variation,
The chaotic laser light signal of different frequency so that the chaotic signal of each frequency can carry information, and then increases chaos photoelectricity
The information saturation of oscillator circuit.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of chaos optical-electronic oscillator provided in an embodiment of the present invention；
Fig. 2 is the original of the microwave photon filter provided in an embodiment of the present invention based on linearly chirped fiber Bragg grating
Reason figure；
Fig. 3 is the flow chart of the chaotic signal producing method of chaos optical-electronic oscillator provided in an embodiment of the present invention.
In above-mentioned attached drawing, appended drawing reference meaning is specific as follows:
1- laser；2- phase-modulator；3- optoisolator；4- circulator；5- linearly chirped fiber Bragg grating；6-
Time delay optical fiber；7- photodetector；8- electric amplifier；9- beam splitter.
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 chaos optical-electronic oscillator, as shown in FIG. 1, FIG. 1 is of the invention real
The structural schematic diagram of the chaos optical-electronic oscillator of example offer is applied, which includes: frequency swept laser 1, phase tune
Device 2, circulator 4, linearly chirped fiber Bragg grating 5, photodetector 7, electric amplifier 8 and beam splitter 9 processed.Wherein:
Frequency swept laser 1, phase-modulator 2, circulator 4 and photodetector 7 are sequentially connected, linearly chirped fiber cloth
Glug grating 5 is connected on circulator 4, and photodetector 7, electric amplifier 8, beam splitter 9 and phase-modulator 2 are successively and first
Tail connects to form loop.
In the present embodiment, frequency swept laser 1, phase-modulator 2, circulator 4, between photodetector 7 and described
It is connected by optical fiber between linearly chirped fiber Bragg grating 5 and circulator 4；The wherein circulator 4 and the photoelectricity
Optical fiber between detector 7 is time delay optical fiber, and length is several meters or thousands of rice；Photodetector 7, electric amplifier 8, beam splitter
Pass through cable connection between 9 and phase-modulator 2.
In the present embodiment, frequency swept laser 1, phase-modulator 2, linearly chirped fiber Bragg grating 5, circulator 4
And photodetector 7 collectively constitutes a microwave photon filter；The passband of microwave photon filter is swashed by the frequency sweep
The difference of light device 1 and 5 reflectance spectrum of linearly chirped fiber Bragg grating determines.
As shown in Fig. 2, Fig. 2 is the microwave photon provided in an embodiment of the present invention based on linearly chirped fiber Bragg grating
The schematic diagram of filter.Model is filtered when the optical wavelength of the signal light of frequency swept laser 1 is in linear chrip light Bragg grating 5
When enclosing interior, if positive (or negative) the rank sideband of signal light is in except 5 filter range of linear chrip Bragg grating at this time, at this time
Sideband except 5 filter range of linear chrip Bragg grating is filtered out, thus the signal for the polygon band being phase-modulated
Light is realized by the conversion of phase-modulation to intensity modulated.After being passed into photodetector 7 by the optical signal after intensity modulated
Both required obtained electric signal had been obtained, the function of microwave photon filter is realized.
In the present embodiment, the period of change of microwave photon filter and signal are in the photodetector 7, electrically amplified
The delay transmitted one week in the loop that device, 8 beam splitters 9 and phase-modulator 2 are formed matches, and meets Fourier mode locking item
Part:
NT=Tr
Wherein n is positive integer, and T is the period of change of the microwave photon filter, and Tr is signal in the photodetection
Delay in one week is transmitted in the loop that device 7, electric amplifier 8, beam splitter 9 and phase-modulator 2 are formed.It is driven when with sawtooth wave
When microwave photon filter, the output of Fourier mode locking optical-electronic oscillator is periodic wideband correlation, signal
Frequency and there are periodic corresponding relationships the time.
Chaos optical-electronic oscillator provided by the invention, can be with using phase-modulator and linear chrip light Bragg grating
Broadband can be adjusted without further changing the other assemblies in route in area of light control wide-band microwave photon filter
Chaotic dynamics state effectively extends the bandwidth of chaotic laser light.
In the present embodiment, the loop that photodetector 7, electric amplifier 8, beam splitter 9 and phase-modulator 2 are formed
Dispersion managed is to zero, so that the delay having the same in the loop of the signal of different frequency.
In the present embodiment, which further includes optoisolator 3；Optoisolator 3 is connected to the phase
Between adjuster 2 and the circulator 4, for preventing optical signal from transmitting from circulator to the phase regulator direction, in turn
Further protection is provided to chaos optical-electronic oscillator route.
In the present embodiment, chaos optical-electronic oscillator further includes Polarization Controller；Polarization Controller is connected to the phase
It between adjuster 2 and the optoisolator or is connected between the optoisolator and the circulator 4, for adjusting chaos
The polarization state of optical-electronic oscillator route.
Chaos optical-electronic oscillator provided by the invention is controlled by the laser power and polarization state that control frequency swept laser
The polarization state that device controls the chaos optical-electronic oscillator route carrys out the intensity of control chaotic optical-electronic oscillator route feedback signal, in conjunction with
The periodically variable emission wavelength that frequency swept laser issues, so that high speed variation is generated, the chaotic laser light letter of different frequency
Number；By generating high speed variation, the chaotic laser light signal of different frequency, so that the chaotic signal of each frequency can carry letter
Breath, and then increase the information saturation of the chaos optical-electronic oscillator route.
According to another aspect of the present invention, a kind of chaotic signal producing method of chaos optical-electronic oscillator is provided, such as
Shown in Fig. 3, Fig. 3 is the chaotic signal producing method of chaos optical-electronic oscillator provided in an embodiment of the present invention, this method comprises:
Step S101, frequency swept laser issue optical signal transmission to phase-modulator.
Wherein, frequency swept laser is that the frequency sweep semiconductor laser of electric current driving or the frequency sweep based on single sideband modulation swash
Light device, and the emission wavelength of the frequency swept laser is in cyclically-varying.
Step S102, after phase-modulator carries out phase-modulation to optical signal, by the inclined of Polarization Controller adjustment route
Polarization state, then linearly chirped fiber Bragg grating is transmitted to through optoisolator.
Wherein, optoisolator is used to prevent optical signal from transmitting from circulator to the phase regulator direction, and then to line
Road provides further protection.
The chaotic signal producing method of chaos optical-electronic oscillator provided by the invention, by the laser for controlling frequency swept laser
The polarization state that power and polarization state controller control the optical-electronic oscillator carrys out control chaotic optical-electronic oscillator route feedback signal
Intensity, in conjunction with frequency swept laser issue periodically variable emission wavelength, thus generate high speed variation, different frequency
Chaotic laser light signal.
Step S103, linearly chirped fiber Bragg grating believe the light that the optical signal of phase-modulation is converted into intensity modulated
Number, photodetector is transmitted to through time delay optical fiber by circulator.
As shown in Fig. 2, Fig. 2 is the microwave photon provided in an embodiment of the present invention based on linearly chirped fiber Bragg grating
The schematic diagram of filter.When the optical wavelength of the signal light of frequency swept laser is in linear chrip light Bragg grating filter range
When interior, if positive (or negative) the rank sideband of signal light is in except linear chrip Bragg grating filter range, locates at this time at this time
Sideband except linear chrip Bragg grating filter range is filtered out, so that the signal light for the polygon band being phase-modulated is real
Show by the conversion of phase-modulation to intensity modulated.It had both been obtained after being passed into photodetector by the optical signal after intensity modulated
Required obtained electric signal, realizes the function of microwave photon filter.
The chaotic signal producing method of chaos optical-electronic oscillator provided by the invention, uses phase-modulator and linear chrip
Light Bragg grating can control wide-band microwave photon filter in area of light, without further changing chaos optical-electronic oscillator
Other assemblies in modified line road can adjust broadband chaotic dynamics state, effectively extend the bandwidth of chaotic laser light.
The optical signal of intensity modulated is converted to electric signal, is transmitted to electric amplifier by step S104, photodetector.
Step S105, electric amplifier amplify electric signal, export through beam splitter, and feed back to phase-modulator.
Wherein, beam splitter is used to for the electric signal that electric amplifier issues being divided into the identical electric signal of two beams, a branch of for defeated
Out, a branch of for feeding back to phase-modulator.
Step S106, when feeding back to the intensity of electric signal of phase-modulator and reaching preset threshold, photodetector, electricity
Chaotic signal is generated in the loop formed between amplifier, beam splitter and phase-modulator.
The chaotic signal producing method of chaos optical-electronic oscillator provided by the invention, it is different by generating high speed variation
The chaotic laser light signal of frequency so that the chaotic signal of each frequency can carry information, and then increases chaos optoelectronic oscillation
The information saturation of device route.
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 chaos optical-electronic oscillator characterized by comprising frequency swept laser (1), phase-modulator (2), circulator
(4), linearly chirped fiber Bragg grating (5), photodetector (7), electric amplifier (8) and beam splitter (9)；
The frequency swept laser (1), phase-modulator (2), circulator (4) and photodetector (7) are sequentially connected, the line
Property chirped fiber Bragg grating (5) be connected on the circulator (4), the photodetector (7), electric amplifier (8), point
Successively simultaneously head and the tail connection forms loop for beam device (9) and phase-modulator (2).
2. chaos optical-electronic oscillator according to claim 1, which is characterized in that the frequency swept laser (1), phase-modulation
Device (2), circulator (4), between photodetector (7) and the linearly chirped fiber Bragg grating (5) and circulator (4)
Between connected by optical fiber, wherein optical fiber between the circulator (4) and the photodetector (7) is time delay optical fiber,
Length is several meters or thousands of rice.
3. chaos optical-electronic oscillator according to claim 1, which is characterized in that the photodetector (7), electric amplifier
(8), pass through cable connection between beam splitter (9) and phase-modulator (2).
4. chaos optical-electronic oscillator according to claim 1, which is characterized in that the frequency swept laser (1) is electric current drive
Dynamic frequency sweep semiconductor laser or the frequency swept laser based on single sideband modulation；The luminous wave of the frequency swept laser (1)
Long is in cyclically-varying.
5. chaos optical-electronic oscillator according to claim 1, which is characterized in that the frequency swept laser (1), phase-modulation
Device (2), linearly chirped fiber Bragg grating (5), circulator (4) and photodetector (7) collectively constitute a microwave light
Subfilter；The passband of the microwave photon filter is by the frequency swept laser (1) and linearly chirped fiber Prague light
The difference of grid (5) reflectance spectrum determines.
6. chaos optical-electronic oscillator according to claim 5, which is characterized in that the variation week of the microwave photon filter
The loop that phase and signal are formed in the photodetector (7), electric amplifier (8), beam splitter (9) and phase-modulator (2)
The delay of middle transmission one week 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 signal in the photodetector
(7), delay in one week is transmitted in the loop that electric amplifier (8), beam splitter (9) and phase-modulator (2) are formed.
7. chaos optical-electronic oscillator according to claim 1, which is characterized in that the photodetector (7), electric amplifier
(8), the Dispersion managed for the loop that beam splitter (9) and phase-modulator (2) are formed is to zero, so that the signal of different frequency is in institute
State delay having the same in loop.
8. chaos optical-electronic oscillator according to claim 1, which is characterized in that the chaos optical-electronic oscillator further includes light
Isolator；The optoisolator is connected between the phase regulator (2) and the circulator (4), for preventing optical signal
It is transmitted from the circulator to the phase regulator direction.
9. chaos optical-electronic oscillator according to claim 8, which is characterized in that the chaos optical-electronic oscillator further includes inclined
Shake controller；The Polarization Controller is connected between the phase regulator (2) and the optoisolator or is connected to institute
It states between optoisolator and the circulator (4), for adjusting the polarization state of the chaos optical-electronic oscillator.
10. a kind of method that chaotic signal is generated using chaos optical-electronic oscillator described in any one of claims 1 to 9,
It is characterized in that, which comprises
Frequency swept laser (1) issues optical signal transmission to phase-modulator (2)；
After the phase-modulator (2) carries out phase-modulation to the optical signal, by the polarization of Polarization Controller adjustment route
State, then linearly chirped fiber Bragg grating (5) are transmitted to through optoisolator；
The linearly chirped fiber Bragg grating (5) believes the light that the optical signal of the phase-modulation is converted into intensity modulated
Number, photodetector (7) are transmitted to through time delay optical fiber by circulator (4)；
The optical signal of the intensity modulated is converted to electric signal by the photodetector (7), is transmitted to electric amplifier (8)；
The electric amplifier (8) amplifies the electric signal, exports through beam splitter (9), and feed back to phase-modulator (2)；
When feeding back to the intensity of electric signal of phase-modulator (2) and reaching preset threshold, photodetector (7), electric amplifier
(8), chaotic signal is generated in the loop formed between beam splitter (9) and phase-modulator (2).
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