CN108199259A - A kind of joint disturbance formula chaotic laser light signal generator and its application method - Google Patents
A kind of joint disturbance formula chaotic laser light signal generator and its application method Download PDFInfo
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- CN108199259A CN108199259A CN201711425251.4A CN201711425251A CN108199259A CN 108199259 A CN108199259 A CN 108199259A CN 201711425251 A CN201711425251 A CN 201711425251A CN 108199259 A CN108199259 A CN 108199259A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/12—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers
Abstract
The present invention relates to chaos laser technical fields, provide a kind of joint disturbance formula chaotic laser light signal generator and its application method.The output port of wherein left distributed semi conductor laser 1 is connect with the port a of fiber coupler 2, and the port b of fiber coupler 2 is connect with the port c of bidirectional optical amplifier 3, the first output port of the port g of fiber coupler 2 as signal generator；The port d of bidirectional optical amplifier 3 is connect with the port e of Er-doped fiber 4, the port f of Er-doped fiber or high back scattering fibre is connect with the port i of fiber coupler 5, second output terminal mouths of the end h of fiber coupler 5 as signal generator, the port j of fiber coupler 5 are connect with the output port of right distributed Feedback semiconductor laser 6.The present invention is being fed back under the synergy of light injection, exports chaotic laser light signal by h ports, the asymmetry of SOA in a link makes SOA only amplify left side light path, ensures that g and h ports generate the chaotic signal of different mode.
Description
【Technical field】
The present invention relates to chaos laser technical fields, occur more particularly to a kind of joint disturbance formula chaotic laser light signal
Device and its application method.
【Background technology】
In recent years, chaotic laser light is true in chaotic secret optic communication, chaotic laser light radar, chaos light time domain reflectometer, high speed
Random number generation, chaos ultrawide band signal generator and distributing optical fiber sensing etc. are widely applied, and become state
The research hotspot of inside and outside scholar.Chaotic laser light, wherein light feedback system can be generated by providing disturbance to semiconductor laser
It is simple in structure, can easily be accommodated and control as main chaotic laser light producing method.
But the chaotic laser light that light feedback system generates at present, output signal can carry the letter related with feedback cavity length
Breath, i.e., there are delay characteristics (Wu Y, et al.IEEE Journal of Quantum Electronics, 2012,48 (11):
1371-1379.).The presence of delay characteristics is harmful to application of the chaotic laser light in many fields, such as：Utilizing chaos
When laser generates high-speed physical true random number as physics entropy source, the stochastic behaviour of random number can be reduced；Lead in chaotic secret light
In letter, there is chaotic laser light delay characteristics information can lead to security breaches；In the application of chaotic radar and optical time domain reflectometer,
False-alarm and erroneous judgement can be introduced, it is therefore necessary to eliminate delay characteristics.Furthermore because semiconductor laser relaxation oscillation frequency occupies
The main energetic of chaotic laser light causes the chaotic signal bandwidth of output only to maintain 10GHz hereinafter, and chaotic spectrum unevenness.
Narrow bandwidth can limit the generating rate of the transmission rate of information in chaotic communication, data encryption rate, random sequence, chaotic spectrum
Unevenness can limit low-frequency component energy, and difficulty is brought for subsequent conditioning circuit acquisition and processing in practical application.Therefore, it is directed to light
Feedback system lead to the problem of chaotic laser light it is existing these, many researchers propose different solutions.
(Wang A, et al.IEEE is studied in the enhancing that sides of Wang An in 2008 et al. are directed to chaotic laser light bandwidth
Photonics Technology Letters,2008,20(19):1633-1635.), it is specially exported from laser continuous
A part of light by optical fiber circulator is fed back to from laser and generates disturbance by light, its is made to export chaotic laser light, and at the same time one
The continuous light that injection laser is output it is injected into from laser, it is found that the band of the chaotic laser light exported from laser is roomy
Three times when about being injected without continuous light, realize the enhancing of the bandwidth of chaotic laser light.
A kind of smooth feedback chaos laser has been invented (see patent by Institutes Of Technology Of Taiyuan in 2011：A kind of smooth feedback chaos swash
Light device, the patent No.：ZL201110198943.6), select suitable single continuous backscatterer or continuously backward dissipate is provided
Continuous feedback chamber of the scatterer penetrated and amplified as semiconductor laser, using continuous feedback chamber to single semiconductor laser
Random feedback disturbance, semiconductor laser is made to generate chaotic laser light, realized with this eliminate light feedback semiconductor laser when
Prolong the purpose of feature.
Dalian University of Technology in 2012 discloses a kind of smooth injection type chaos photonic integrated device and preparation method thereof (see specially
Profit：A kind of smooth injection type chaos photonic integrated device, the patent No.：ZL201210349951.0), the single-chip integration chaos laser
Including two distributed Feedback semiconductor laser DFB, a semiconductor optical amplifier and one section of passive optical waveguide, using unidirectional
Light injection method produces the chaotic laser light in broadband.Specific work process is：Main distributed feedback semiconductor laser generates continuous light,
Continuous light unidirectionally amplifies by semiconductor optical amplifier, and amplified continuous light is injected into through passive optical waveguide from distributed feed-back half
Conductor laser, herein passive optical waveguide only play a part of one transmission light.Swashed by adjusting master slave distribution FeedBack Semiconductor
The Injection Current of light device makes its centre wavelength detuning, while the amplification factor for adjusting semiconductor optical amplifier realizes injection intensity tune
Section, and then master slave distribution feedback semiconductor laser generates and claps phenomenon, can be generated from distributed feedback semiconductor laser at this time
Go out the chaotic laser light in broadband.
It is worth noting that, Wang Anbang et al. researchs find (Wang A B, et al.Optics Letters, 2009,34
(8):1144-1146.), single injection type structure is also easy to produce injection locking, and single injection is uneven, defeated there are chaotic laser light frequency spectrum
Go out the shortcomings that unstable, and usually contain the beat frequency information of two lasers, the frequency spectrum of chaotic laser light can be made to occur typically
Beat frequency oscillator composition can equally influence resolution ratio, the limitation chaotic optical communication of chaos light time domain reflectometer and chaotic laser light radar
Transmission rate and generate random number code check.
Institutes Of Technology Of Taiyuan in 2014, which has invented a kind of no time delay, spectral flatness, broadband photon and integrates chaos semiconductor, swashs
Light device is (see patent：No time delay, spectral flatness, broadband photon integrate chaos semiconductor laser, the patent No.：
ZL201410435033.9), which accurately controls the length of the passive optical waveguide of upside-down mounting paster technique precision and er-doped, a left side point
The length of cloth FeedBack Semiconductor laser chip, the length of right distributed Feedback semiconductor laser chip two-way are put without being isolated
The passive optical waveguide of er-doped is formed continuously distributed formula as continuous scatterer and fed back by the length of big semiconductor optical amplification chip
Chamber, and it is big using the luminous power that the left and right distributed Feedback semiconductor laser chip of semiconductor optical amplification chip controls mutually injects
Small and er-doped passive optical waveguide is to the feedback intensity of left distributed Feedback semiconductor laser chip, it is therefore an objective to it is special to generate no time delay
Sign, spectral flatness, broadband chaotic laser light.The rear orientation light that light generates when being propagated in Er-doped fiber is weaker, back scattering
During Guang Yuan roads are fed back, loss, portion are generated due to fault of construction in fiber lengths, fiber optic materials and optical waveguide etc.
Point feedback light may not enter semiconductor optical amplification chip also and just be lost completely.Therefore, portion pair in Er-doped fiber
Semiconductor laser generates feedback, and only left feedback light is amplified the disturbance of left distributed Feedback semiconductor laser.
2015, Chinese Academy of Sciences's semiconductor invented a kind of broadband chaos based on Integrated-External Cavity Semiconductor Laser
Optical generator is (see patent：Broadband chaos optical generator based on Integrated-External Cavity Semiconductor Laser, the patent No.：
201510028646.5), which utilizes an Integrated-External Cavity Semiconductor Laser chip and the optical feedback return circuit of an outside
It realizes broadband and stablizes large-scale chaos optical signal generation, specific work process is defeated for Integrated-External Cavity Semiconductor Laser chip
Light extraction is by optical fiber circulator, coupler, by coupler by Integrated-External Cavity Semiconductor Laser output light via optical circulator
Optical signal be sent into backfeed loop according to a preset power ratio part and form light feedback, so as to generate broadband stablize it is large-scale
Chaos optical signal.
【Invention content】
It is a kind of simple in structure, easy to operate and realize based on random distribution the technical problem to be solved by the present invention is to design
Formula light, which feeds back to combine light and mutually inject, combines disturbance, and generation has the mixed of the wide and flat chaotic laser light of weak delay characteristics, frequency spectrum
Ignorant semiconductor laser
The technical issues of further solving is that it is different how design structure so that different two port of laser generates
The chaotic signal of pattern.
The present invention adopts the following technical scheme that：
In a first aspect, the present invention provides a kind of joint disturbance formula chaotic laser light signal generator, including：It is left distributed anti-
Present semiconductor laser 1, fiber coupler 2, bidirectional optical amplifier 3, Er-doped fiber 4, fiber coupler 5 and right distributed Feedback
Semiconductor laser 6, wherein,
The output port of left distributed semi conductor laser 1 is connect with the port a of fiber coupler 2, fiber coupler 2
Port b is connect with the port c of bidirectional optical amplifier 3, the first output terminal of the port g of fiber coupler 2 as signal generator
Mouthful；The port d of bidirectional optical amplifier 3 is connect with the port e of Er-doped fiber 4, the port f of Er-doped fiber or high back scattering fibre with
The port i connections of fiber coupler 5, the end h of fiber coupler 5 can be as the second output terminal mouth of signal generator, optical fiber coupling
The port j of clutch 5 is connect with the output port of right distributed Feedback semiconductor laser 6.
Preferably, the distributed Feedback semiconductor laser 1 and distributed Feedback semiconductor laser 6 use 1550nm
± 20nm wavelength, the threshold current of two-laser differ range between ± 1mA.
Preferably, in the splitting ratio of fiber coupler 2, main optical path splitting ratio is 70%-90%, wherein, from left distribution
The optical signal of 70%-90% is put from the port b inputs bi-directional light of fiber coupler 2 in the optical signal that semiconductor laser 1 exports
The signal of the port c of big device 3, corresponding 30%-10% are exported from the port g of fiber coupler 2.
Preferably, Er-doped fiber length is more than or equal to 10-200m.
Preferably, the left distributed Feedback semiconductor laser 1 and right distributed Feedback semiconductor laser 6 are band temperature
Device is controlled, two-laser makes laser works near same temperature under temperature controlling device adjusting, and two-laser output is kept to swash
The centre wavelength of light is of substantially equal, and difference is in ± 0.1nm.
Second aspect, the present invention also provides a kind of application methods of joint disturbance formula chaotic laser light signal generator, lead to
The centre wavelength that temperature controller is adjusted between left distributed feedback semiconductor laser 1 and right distributed feedback semiconductor laser 6 is crossed to lose
It is humorous；
The driving current of left distributed feedback semiconductor laser 1 and right distributed feedback semiconductor laser 6 is adjusted, realizes light
Power setting；
Left semiconductor laser sends out continuous light through fiber coupler 2, bidirectional optical amplifier 3 and Er-doped fiber 4, formed with
Before machine right semiconductor is reached by 4 port f of Er-doped fiber and photo-coupler 5 to strong scattering light, the random forward direction strong scattering light
Laser generates random light injection to right semiconductor laser and acts on；Right semiconductor laser 6 sends out continuous light through photo-coupler
5, Er-doped fiber 4 forms random forward direction weak scattering, and the random forward direction weak scattering light passes through after the amplification of bidirectional optical amplifier 3
Fiber coupler 2 generates random light injection to left semiconductor laser and acts on.
Preferably, left distributed feedback semiconductor laser 1 and right distributed feedback semiconductor laser 6 are adjusted so that laser
Device operating current is adjusted to 1.1~2 times of laser threshold current, output light wavelength it is detuning for 0GHz-30GHz, output work
Rate deviation is less than 70%.
Preferably, left semiconductor laser sends out continuous light, and after the light splitting of fiber coupler 2,90% continuous light is from b
The port c of end input bidirectional optical amplifier 3,10% light export chaos optical signal as the first of signal generator；It partly leads on the right side
Body laser sends out continuous light, and after the light splitting of photo-coupler 5,90% continuous light reaches Er-doped fiber port j, 10% light conduct
Second output chaos optical signal of signal generator.
Preferably, bias current is determined according to the end h of the port g of fiber coupler 2 and fiber coupler 5 power exported
Adjustment amount；
The frequency of two-laser is determined according to the end h of the port g of fiber coupler 2 and fiber coupler 5 spectrum exported
Mismatching angle；
Wherein, fiber coupler 2 and fiber coupler 5 are 2 into 2 couplers gone out, then detect power from another input terminal
Become the size for bringing determining feedback intensity and injection intensity.
Compared with prior art, the beneficial effects of the present invention are：
Bidirectional optical amplifier is used for realizing mutual injection light and scattering light amplification, the gain control of SOA in primary link in the present invention
System plays direct and important function in systems.For relatively left semiconductor laser, under SOA amplification Er-doped fiber scattering processes
The strong scattering light of return, that is, amplify feedback intensity and right semiconductor laser fed back in by link and injection effect under generation
Chaos light (or qualitative sense influenced to generate by link for right semiconductor laser forward direction weak scattering), i.e. amplification injection is strong
Degree, the two is amplified to generate left semiconductor laser feedback and injection effect, and chaos laser signal is exported by g ports.
Relatively right semiconductor laser, SOA is without amplification, so right semiconductor laser generates backward through Er-doped fiber scattering process
Weak scattering, i.e. feedback intensity, the chaos light generated in the case where left semiconductor laser is fed back in by link and injection acts on (or it is qualitative
Understanding is the forward direction strong scattering that left semiconductor laser is influenced to generate by link, similarly hereinafter), under the synergy of light injection,
Chaotic laser light signal is exported by h ports.The asymmetry of SOA in a link makes SOA only amplify left side light path, so as to ensure g ends
Mouth generates the chaotic signal of different mode with h ports.
【Description of the drawings】
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of structure diagram of joint disturbance formula chaotic laser light signal generator provided in an embodiment of the present invention；
Fig. 2 is a kind of application method flow of joint disturbance formula chaotic laser light signal generator provided in an embodiment of the present invention
Figure；
Fig. 3 is the structural representation of another joint disturbance formula chaotic laser light signal generator provided in an embodiment of the present invention
Figure.
【Specific embodiment】
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In the description of the present invention, the fingers such as term " interior ", " outer ", " longitudinal direction ", " transverse direction ", " on ", " under ", " top ", " bottom "
The orientation or position relationship shown be based on orientation shown in the drawings or position relationship, be for only for ease of the description present invention rather than
It is required that the present invention must be with specific azimuth configuration and operation, therefore it is not construed as limitation of the present invention.
In various embodiments of the present invention, symbol "/" represents the meaning for having there are two types of function simultaneously, such as " the second entry/exit light
Mouthful " show that the port both can also light extraction with entering light.And symbol " A and/or B " is then shown before and after being connected by the symbol
Combination between object includes " A ", " B ", " A and B " three kinds of situations, such as " back-scattering light and/or reflected light ", then shows it
It can express individual " back-scattering light ", in individual " reflected light " and " back-scattering light and reflected light " three kinds of meanings
It is one of arbitrary.
In addition, as long as technical characteristic involved in the various embodiments of the present invention described below is each other not
Conflict is formed to can be combined with each other.
SOA is for controlling the size of feedback and injected optical power in link of the present invention, while ensures the scattering light in link
It will not being lost completely, increase injected optical power is conducive to chaos light and mutually injects, under the injection of both-end optical signal, principal and subordinate's laser
It is mutual it is pouring-in realize chaotic signal shaping and bandwidth enhancement, the chaotic laser light frequency spectrum generated from laser by power control
Bandwidth and flatness.Er-doped fiber or high back scattering fibre form feedback cavity as continuous backscatterer, provide two-way
Random rear orientation light makes main laser generate the random perturbation without delay characteristics, increases the random perturbation of left and right laser,
It acts on to achieve the purpose that generate chaos light, makes so as to which random feedback light noise spectra of semiconductor lasers be made to generate sufficiently large optical disturbance
Chaotic laser light signal is produced from distributed feedback semiconductor laser.
Embodiment 1:
The embodiment of the present invention 1 provides a kind of joint disturbance formula chaotic laser light signal generator, which is characterized in that including：
Left distributed Feedback semiconductor laser 1, fiber coupler 2, bidirectional optical amplifier 3, Er-doped fiber 4, fiber coupler 5 and the right side
Distributed Feedback semiconductor laser 6, wherein,
The output port of left distributed semi conductor laser 1 is connect with the port a of fiber coupler 2, fiber coupler 2
Port b is connect with the port c of bidirectional optical amplifier 3, the first output terminal of the port g of fiber coupler 2 as signal generator
Mouthful；The port d of bidirectional optical amplifier 3 is connect with the port e of Er-doped fiber 4, the port f of Er-doped fiber or high back scattering fibre with
The port i connections of fiber coupler 5, the end h of fiber coupler 5 can be as the second output terminal mouth of signal generator, optical fiber coupling
The port j of clutch 5 is connect with the output port of right distributed Feedback semiconductor laser 6.
Wherein, Er-doped fiber 4 can also be what is realized by high back scattering optical fiber.
In embodiments of the present invention, (Semiconductor Optical Amplifier, are abbreviated as bidirectional optical amplifier：
SOA) in the side of optical fiber, the scattering light of itself of the reception of left laser and the opposite laser injected are amplified by SOA
, the scattering that right laser receives without amplification, though and the injection light from left laser be amplified, after optical fiber substantially
Attenuation；The influence that laser is subject on the left of resulting in this way is strong, and corresponding chaos light effect is more preferable, and then injects the light on right side
Chaos state it is preferable, on the contrary, right side effect is slightly worse, left side is influenced corresponding smaller.The embodiment of the present invention is applicable to two
During a difference chaotic laser light, such as：It, can be respectively as common signal channel and the transmission signal of secret channel in secret communication；It is double
End interval very short time can realize target speed measuring function on the basis of chaos laser range-measurement.
Purpose of design is to generate the chaotic laser light of more preferable (amplitude is big, wide spectrum, spectral flatness etc.), solve the problems, such as be exactly
Chaos applications field can be preferably used for；Wherein, amplitude can preferably be used for greatly the high power laser output in ranging；It is wide
Spectrum and the flat random number (random code) that can generate higher speed, while can ensure in (10Gbps) secret communication at a high speed more
Loading well, hiding information.
With reference to well-behaved inventive embodiments, additionally provide and be suitable for the invention preferred distributed Feedback semiconductor laser
The apolegamy of wavelength, such as：The distributed Feedback semiconductor laser 1 and distributed Feedback semiconductor laser 6 use
1550nm ± 20nm wavelength, the threshold current of two-laser differ range between ± 1mA.The wavelength in addition to 1550nm ±
Outside 20nm ranges, it usually can also be what is chosen from a section, such as 1490-1600nm.
In embodiments of the present invention, in the splitting ratio of fiber coupler 2, main optical path splitting ratio is 70%-90%, wherein,
The port b of optical signal from the fiber coupler 2 of 70%-90% is defeated in the optical signal exported from left distributed semi conductor laser 1
Enter the port c of bidirectional optical amplifier 3, the signal of corresponding 30%-10% is exported from the port g of fiber coupler 2.
In embodiments of the present invention, Er-doped fiber length is more than or equal to 10-200m.Wherein, 10-50m scattered light intensities are small, frequency
Effect in spectrum is not very good, can be used for sensing ranging, 50-200m scattering strengths are big, chaos effect is more preferable, are more suitable for information
Encryption, secret communication etc..
In embodiments of the present invention, the left distributed Feedback semiconductor laser 1 and right distributed Feedback semiconductor swash
Light device 6 is with temperature controller, and two-laser makes laser works near same temperature under temperature controlling device adjusting, keeps two
The centre wavelength of laser output laser is of substantially equal, and difference is in ± 0.1nm.Chaos state is very sensitive, extraneous small sample perturbations
It will be impacted, the stabilization of temperature can make laser preferably be maintained at the working condition adjusted, and make it
The condition (SOA amplification factors, mutual injection intensity, laser works electric current etc.) that he generates chaos accordingly does not change
Become.
Embodiment 2：
The embodiment of the present invention additionally provides a kind of application method of joint disturbance formula chaotic laser light signal generator, such as Fig. 2
It is shown, include the following steps：
In step 201, left distributed feedback semiconductor laser 1 is adjusted by temperature controller and right distributed feedback semiconductor swashs
Centre wavelength between light device 6 is detuning.
Wherein, preferably bidirectional image intensifer 3 also gives configuration temperature control component, is more accurately controlled so as to reach.
In step 202, the drive of left distributed feedback semiconductor laser 1 and right distributed feedback semiconductor laser 6 is adjusted
Streaming current realizes luminous power setting.
In step 203, left semiconductor laser sends out continuous light through fiber coupler 2, bidirectional optical amplifier 3 and er-doped
Optical fiber 4, forms random forward direction strong scattering light, and the random forward direction strong scattering light passes through 4 port f of Er-doped fiber and photo-coupler 5
Right semiconductor laser is reached, generating random light injection to right semiconductor laser acts on；Right semiconductor laser 6 is sent out continuously
Light is through photo-coupler 5, and Er-doped fiber 4 forms random forward direction weak scattering, and the random forward direction weak scattering light is through bidirectional optical amplifier 3
After amplification, by fiber coupler 2, random light injection is generated to left semiconductor laser and is acted on.
In embodiments of the present invention, SOA is in the side of optical fiber, the scattering light of itself of the reception of left laser and opposite note
The laser entered is amplified by SOA, the scattering that right laser receives without amplification, though and from the injection light of left laser
It is amplified, but substantially decays after optical fiber；It is strong that the influence that left side laser is subject to is resulted in this way, corresponding chaos light efficiency
Fruit is more preferable, and then the chaos state for injecting the light on right side is preferable, on the contrary, right side effect is slightly worse, left side is influenced corresponding smaller.
In embodiments of the present invention, there are a kind of preferred implementation, wherein, adjust left distributed feedback semiconductor laser
Device 1 and right distributed feedback semiconductor laser 6 so that the 1.1~2 of laser works current regulation to laser threshold current
Times, the detuning of output light wavelength is 0GHz-30GHz, and output power deviation is less than 70%.
In certain experiment use-case, the initialization electric current of laser 1 takes 1.27 times of threshold current, and output power-
1.5dBm, laser 6 is to the injection intensity -4dB of laser 1, the feedback intensity -6.1dB that laser 1 receives, when 1 He of laser
During the optical wavelength mismatching angle about 9GHz of laser 6,16.9GHz can about be arrived by exporting the spectral bandwidth of chaotic laser light, and two swash at this time
The output power deviation general 40% of light device.Experimental result is：Feedback intensity be -9dB, injection intensity be 0.2 (i.e. -7dB), two
The wavelength mismatching angle 11GHz of laser, the general 20GHz of chaotic signal spectrum width of output.
In embodiments of the present invention, there are a kind of preferred implementation, wherein, left semiconductor laser is sent out continuously
Light, after the light splitting of fiber coupler 2,90% continuous light inputs the port c of bidirectional optical amplifier 3 from b ends, and 10% light is made
First for signal generator exports chaos optical signal；Wherein, output power can be solved by amplifier, therefore, the first output
The accounting of chaos optical signal can be also lower than 10%, can be realized in the laser structure that the embodiment of the present invention is proposed；
Right semiconductor laser sends out continuous light, after the light splitting of photo-coupler 5,90% continuous light arrival Er-doped fiber port j, and 10%
Light exports chaos optical signal as the second of signal generator.
In embodiments of the present invention, the power exported according to the end h of the port g of fiber coupler 2 and fiber coupler 5 is true
Determine bias current adjustment amount；
The frequency of two-laser is determined according to the end h of the port g of fiber coupler 2 and fiber coupler 5 spectrum exported
Mismatching angle；
Wherein, fiber coupler 2 and fiber coupler 5 are 2 into 2 couplers gone out, then detect power from another input terminal
Become the size for bringing determining feedback intensity and injection intensity.Adjust every time will by the sequential of the output signal for observing g, h end,
Frequency spectrum, spectrum are with determining chaos state at that time.As shown in figure 3, coupler is can to make 2*2 in embodiments of the present invention
, originally the coupler of 1*2 can not monitor the intensity that left laser is injected in a ports in the case of system worked well, use
The coupler of 2*2 can then converse a ports by monitoring power equal proportion and enter left laser in the port below a ports
Power, the monitoring and corrective action during system debug can be realized in this way.
SOA is used for realizing mutual injection light and scattering light amplification in primary link, and the gain control of SOA is played directly in systems
And important function.For relatively left semiconductor laser, SOA amplifies the strong scattering light returned under Er-doped fiber scattering process, i.e.,
Feedback intensity is amplified and right semiconductor laser is fed back in by link and the chaos light of generation under injection effect is (or qualitative
It is interpreted as the forward direction weak scattering that right semiconductor laser is influenced to generate by link), i.e., injection intensity is amplified, and two are amplified
Intensity generates left semiconductor laser feedback and injection acts on, and chaos laser signal is exported by g ports.Relatively right semiconductor
Laser, SOA is without amplification, so right semiconductor laser generates backward weak scattering through Er-doped fiber scattering process, i.e., instead
Feedback intensity is not amplified, feed back in by link with reference to left semiconductor laser and the chaos light of the lower generation of injection effect (or qualitative reason
Solution is left semiconductor laser is influenced the forward direction strong scattering generated by link, similarly hereinafter) injection synergy under, it is defeated by h ports
Go out chaotic laser light signal.The asymmetry of SOA in a link makes SOA only amplify left side light path, so as to ensure g ports and h ports
Generate the chaotic signal of different mode.When the embodiment of the present invention is applicable to two different chaotic laser lights, such as：Secret communication
In, it can be respectively as common signal channel and the transmission signal of secret channel；Both-end interval very short time can survey in chaotic laser light
Target speed measuring function is realized away from the basis of.
It is noted that g ports and h ports are as the delivery outlet of chaotic laser light in the present invention, but the output of two-port
Pattern is different.Left distributed Feedback semiconductor laser sends out continuous light by image intensifer and Er-doped fiber, in strong scattering and
Under weak scattering optical chaos injection effect, chaotic laser light is exported by g ports；Right distributed Feedback semiconductor laser sends out continuous light
By Er-doped fiber, in weak scattering and by under the chaos injection of strong scattering light, chaotic laser light is exported by h ports.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of joint disturbance formula chaotic laser light signal generator, which is characterized in that including：Left distributed Feedback semiconductor laser
Device 1, fiber coupler 2, bidirectional optical amplifier 3, Er-doped fiber 4, fiber coupler 5 and right distributed Feedback semiconductor laser
6, wherein,
The output port of left distributed semi conductor laser 1 is connect with the port a of fiber coupler 2, the port of fiber coupler 2
B is connect with the port c of bidirectional optical amplifier 3, the first output port of the port g of fiber coupler 2 as signal generator；It is double
It is connect to the port d of image intensifer 3 with the port e of Er-doped fiber 4, the port f and optical fiber of Er-doped fiber or high back scattering fibre
The port i connections of coupler 5, the end h of fiber coupler 5 can be as the second output terminal mouth of signal generator, fiber coupler 5
Port j connect with the output port of right distributed Feedback semiconductor laser 6.
2. joint disturbance formula chaotic laser light signal generator according to claim 1, which is characterized in that described distributed anti-
It presents semiconductor laser 1 and distributed Feedback semiconductor laser 6 uses 1550nm ± 20nm wavelength, the threshold value electricity of two-laser
Stream difference range is between ± 1mA.
3. joint disturbance formula chaotic laser light signal generator according to claim 1, which is characterized in that fiber coupler 2
Splitting ratio in, main optical path splitting ratio be 70%-90%, wherein, from left distributed semi conductor laser 1 export optical signal in
The optical signal of 70%-90% inputs the port c, corresponding 30%-10% of bidirectional optical amplifier 3 from the port b of fiber coupler 2
Signal exported from the port g of fiber coupler 2.
4. joint disturbance formula chaotic laser light signal generator according to claim 1, which is characterized in that Er-doped fiber length
More than or equal to 10-200m.
5. joint disturbance formula chaotic laser light signal generator according to claim 1, which is characterized in that the left distribution
Feedback semiconductor laser 1 and right distributed Feedback semiconductor laser 6 are with temperature controller, and two-laser is in temperature controlling device tune
Under section, make laser works near same temperature, the centre wavelength for keeping two-laser output laser is of substantially equal, and difference exists
±0.1nm。
6. a kind of application method of joint disturbance formula chaotic laser light signal generator, which is characterized in that
Center between left distributed feedback semiconductor laser 1 and right distributed feedback semiconductor laser 6 is adjusted by temperature controller
Wavelength is detuning；
The driving current of left distributed feedback semiconductor laser 1 and right distributed feedback semiconductor laser 6 is adjusted, realizes luminous power
Setting；
Left semiconductor laser sends out continuous light through fiber coupler 2, bidirectional optical amplifier 3 and Er-doped fiber 4, formed it is random before
To strong scattering light, the random forward direction strong scattering light reaches right semiconductor laser by 4 port f of Er-doped fiber and photo-coupler 5
Device generates random light injection to right semiconductor laser and acts on；Right semiconductor laser 6 sends out continuous light through photo-coupler 5, mixes
Erbium optical fiber 4 forms random forward direction weak scattering, and the random forward direction weak scattering light passes through optical fiber after the amplification of bidirectional optical amplifier 3
Coupler 2 generates random light injection to left semiconductor laser and acts on.
7. the application method of joint disturbance formula chaotic laser light signal generator according to claim 6, which is characterized in that
Adjust left distributed feedback semiconductor laser 1 and right distributed feedback semiconductor laser 6 so that laser works electric current tune
Save laser threshold current 1.1~2 times, the detuning of output light wavelength is 0GHz-30GHz, and output power deviation is less than
70%.
8. the application method of joint disturbance formula chaotic laser light signal generator according to claim 6, which is characterized in that left
Semiconductor laser sends out continuous light, and after the light splitting of fiber coupler 2,90% continuous light inputs two-way light amplification from b ends
The port c of device 3,10% light export chaos optical signal as the first of signal generator；Right semiconductor laser is sent out continuously
Light, after the light splitting of photo-coupler 5,90% continuous light reaches Er-doped fiber port j, 10% light as signal generator second
Export chaos optical signal.
9. the application method of joint disturbance formula chaotic laser light signal generator according to claim 6, which is characterized in that root
Bias current adjustment amount is determined according to the port g of fiber coupler 2 and the end h of fiber coupler 5 power exported；
The frequency detuning of two-laser is determined according to the end h of the port g of fiber coupler 2 and fiber coupler 5 spectrum exported
Amount；
Wherein, fiber coupler 2 and fiber coupler 5 are 2 into 2 couplers gone out, then detect power conversion from another input terminal
To determine the size of feedback intensity and injection intensity.
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