CN109244823A - A kind of chaotic laser light production method and system that high bandwidth is hiding with time delay label - Google Patents
A kind of chaotic laser light production method and system that high bandwidth is hiding with time delay label Download PDFInfo
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- CN109244823A CN109244823A CN201811305714.8A CN201811305714A CN109244823A CN 109244823 A CN109244823 A CN 109244823A CN 201811305714 A CN201811305714 A CN 201811305714A CN 109244823 A CN109244823 A CN 109244823A
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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
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0085—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for modulating the output, i.e. the laser beam is modulated outside the laser cavity
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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
-
- 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
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The chaotic laser light production method and system hidden the invention proposes a kind of high bandwidth and time delay label.In the feedback cavity of traditional external cavity semiconductor laser, phase modulation module and time delay optical fiber interferometer are sequentially added.Radio frequency of the chaotic laser light of output after photoelectric conversion and amplification as phase-modulator is inputted, is formed from CHAOTIC PHASE MODULATED structure.The beneficial effects of the invention are as follows realize the generation of broadband chaotic laser light, the hiding and symmetrical amplitude distribution of time delay label simultaneously.
Description
Technical field
The present invention relates to a kind of generation schemes of broadband chaotic laser light, and in particular to a kind of high bandwidth and time delay label are hidden
Chaotic laser light production method and system.
Background technique
Chaotic laser light is in fields such as secret communication, the generation of high-speed physical random number and the detections of high-resolution unjammable radar
With important application.Using broadband, significantly chaotic laser light recycles Chaotic Synchronous to carry out letter as the carrier wave for hiding information
Breath demodulation, may be implemented the coded communication of high speed information；Chaotic laser light because of its high bandwidth, significantly noise like characteristic, by with
Make physics entropy source of new generation to solve the problems, such as that the real-time generating rate of physical random number is insufficient；Using broadband chaotic laser light as letter
Number source constructs radar system, can effectively improve the distance resolution of target acquisition.
The advantages that external cavity semiconductor laser is simple and convenient to operate, is easily integrated due to structure becomes chaotic laser light generation
With the most common light source of application.However, scholars have found that the chaos that external cavity semiconductor laser generates swashs after further investigation
There are some defects for light: (1) external cavity semiconductor laser has apparent relaxation oscillation, from power spectrum, chaotic laser light
Main energetic concentrate near relaxation oscillation frequency, therefore limit the effective bandwidth and flatness of power spectrum；(2) due to outer
The presence of chamber resonance causes the chaotic signal autocorrelator trace generated to occur apparent relevant peaks, this spy at the exocoel period
Sign is referred to as time delay label；(3) the chaotic laser light amplitude oscillation that external cavity semiconductor laser generates is unbalanced, and amplitude distribution is presented
It is apparent asymmetric.The presence of these defects limits actual application.In secret communication, relaxation oscillation leads to chaotic laser light
Bandwidth is only number GHz, and this limited bandwidth will limit the transmission rate of chaotic optical communication；Delay characteristics have revealed exocoel simultaneously
Length, this key structure signal reconstruct chaotic carrier signal can be utilized by causing to intercept and capture, and then crack the information of transmission, be weakened
The safety of communication system.In physical random number generation, limited entropy source bandwidth limits the physical random number of generation
Rate；Delay characteristics and asymmetric amplitude distribution be degrading respectively 0,1 bit randomness and balanced ratio, need to utilize complexity
Subsequent processing optimizes.In terms of radar detection, limited bandwidth limits the promotion of chaotic laser light detection range resolution ratio；
Delay characteristics also reduce safety and the anti-interference ability of radar system.
Summary of the invention
In view of the above problems, the present invention proposes a kind of production method of broadband chaotic laser light.The chaos letter that this method generates
Power spectrum and symmetrical amplitude distribution number with high broadband, and can effectively inhibit time delay label.
For achieving the above object, the present invention proposes a kind of chaotic laser light generation side that high bandwidth is hidden with time delay label
Method, specifically, sequentially adding phase modulation module and delay in the feedback loop of traditional external cavity semiconductor laser (ECSL)
Interferometer；The output light of the time delay interferometer is divided into two-way: laser is injected back after attenuator as feedback light all the way
Device；Another way is further classified as Liang Zilu: one sub- road and is converted to electrical domain chaotic signal by photodetector, and the electrical domain is mixed
Ignorant signal inputs after amplifier amplifies as the radio frequency of the phase modulation module, is formed from CHAOTIC PHASE MODULATED；It is another
Sub- road is as the broadband chaotic laser light finally generated.
Preferably, the output light of Distributed Feedback Laser, which is input in phase modulation module after an optical circulator, carries out electricity
Light phase modulation, the output light of phase modulation module are input to the time delay interferometer being made of two sections of different length optical fiber.
Preferably, the output of time delay interferometer is divided into two parts through photo-coupler.
Preferably, attenuator is passed through in the output of time delay interferometer all the way and optical circulator is then injected into back laser, as
Light signal fed back.
Preferably, phase modulation module is common electro-optic phase modulator.
Preferably, phase modulation module can use Mach-Zehnder modulators (MZM) or electro-optic phase modulator.
Preferably, the time delay interferometer can use Mach-Zender interferometer (MZI), polarized interferometer, Sagnac
Interferometer, Michelson (Michelson) interferometer or Fabry-Perot (Fabry-Perot) interferometer.
Meanwhile the present invention also proposes a kind of chaotic laser light generation system that high bandwidth is hidden with time delay label, the system
Including the first signal circuit and second signal circuit: the first signal circuit include Distributed Feedback Laser, optical circulator, phase-modulator,
Time delay interferometer and optical attenuator；Second signal circuit is that the radiofrequency signal being made of photodetector and electron-amplifier is returned
Road；
The output light of Distributed Feedback Laser is input to progress electric light phase tune in phase-modulator after an optical circulator
System, the output light of phase-modulator are input to the time delay interferometer being made of two sections of different length optical fiber, delay interference
The output of instrument is divided into two parts through photo-coupler；A portion successively passes through attenuator and optical circulator is then injected into back laser
Device, as light signal fed back；Another part again passes by photo-coupler and is divided into two sub- road optical signals: wherein a sub- road is as final
The broadband chaotic laser light of generation, another sub- road are converted to electric signal by photodetector, then amplify by electron-amplifier
It is inputted afterwards as the radio frequency of phase-modulator.
Detailed description of the invention
Fig. 1 the structural representation of present invention.
The common ECSL of Fig. 2 generates the power spectrum of chaotic signal.
Fig. 3 present invention, which proposes a plan, generates the power spectrum of chaotic signal.
The common ECSL of Fig. 4 generates the amplitude distribution of chaotic signal.
Fig. 5 present invention, which proposes a plan, generates the amplitude distribution of chaotic signal.
The common ECSL of Fig. 6 generates the auto-correlation function of chaotic signal.
The common ECSL of Fig. 7 generates the delay mutual information of chaotic signal.
The common ECSL of Fig. 8 generates the arrangement entropy of chaotic signal.
Fig. 9 present invention, which proposes a plan, generates the auto-correlation function of chaotic signal.
Figure 10 present invention, which proposes a plan, generates the delay mutual information of chaotic signal.
Figure 11 present invention, which proposes a plan, generates the arrangement entropy of chaotic signal.
In figure: DFB:DFB laser；PM: phase-modulator；OC: optical circulator；PC, Polarization Controller；FC: optical fiber coupling
Clutch；PD: photodetector；Amp: electron-amplifier；DL: fiber delay line；VOA: adjustable optical attenuator.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, with reference to the accompanying drawing, the solution of the present invention is made
Further it is described in detail.
As shown in Figure 1, scheme proposed by the present invention includes the first signal circuit and second signal circuit: the first signal circuit
It is by Distributed Feedback Laser, optical circulator, phase-modulator and time delay interferometer MZI；Second signal circuit be by photodetector and
The radiofrequency signal circuit that electron-amplifier is constituted.
The output light of Distributed Feedback Laser is input to progress electric light phase tune in phase-modulator after an optical circulator
System, the output light of phase-modulator are input to the time delay interferometer being made of two sections of different length optical fiber, delay interference
The output of instrument is divided into two parts through photo-coupler.A portion successively passes through attenuator and optical circulator is then injected into back laser
Device, as light signal fed back；Another part again passes by photo-coupler and is divided into two ways of optical signals: wherein generating all the way as final
Broadband chaotic laser light, another way is converted to electric signal by photodetector, the then conduct after electron-amplifier amplifies
The radio frequency of phase-modulator inputs.
Broadband chaotic laser light proposed by the invention, which generates scheme, following benefit: (1) possessing high bandwidth, frequency spectrum flatness
It is high；(2) external cavity semiconductor laser delay characteristics as caused by external cavity feedback are eliminated；(3) symmetry of amplitude distribution is obvious
Improved.Therefore, it is applied in secret communication, the safety of transmission rate and chaotic carrier can be improved.By the broadband
Chaos applications are in random number, as the physics entropy source of randomizer, can promote the rate for generating random number, and be not required to
The post-processing approach of complexity is wanted to eliminate the influence of delay characteristics.In addition radar detection can be promoted using the Chaotic Wideband Signal
Distance resolution, while the elimination of delay characteristics improves safety and the anti-interference ability of radar system.
Embodiment
The realization that Fig. 2-5 illustrates chaotic laser light bandwidth enhancement and amplitude distribution improves.We are using power spectral energies
80% is used as effective bandwidth.As shown in Fig. 2, the chaotic signal that general ECSL is generated, since main frequency content concentrates on relaxing
Near the oscillation frequency of Henan, usually only several GHz of effective bandwidth.As shown in figure 3, the scheme proposed through the invention, power spectrum are bright
Aobvious to be broadened, effective bandwidth is promoted to 26GHz.In addition, the effective bandwidth in result is primarily limited to electronics device in experiment here
The bandwidth of part (photodetector and cable).Therefore, when the use higher electronic device of bandwidth, the bandwidth meeting of practical chaotic signal
It is wider.In addition, as shown in figure 4, apparent asymmetry is presented in the chaotic signal of general ECSL output, amplitude distribution function,
This asymmetry is embodied in oscillation amplitude and to be not in relation to mean value symmetrical.As shown in figure 5, generated by the scheme that invention proposes
Chaotic signal, amplitude distribution be improved significantly, show the symmetrical of class Gaussian Profile.
Fig. 6-11 illustrates the realization of time delay label elimination, we are using auto-correlation function (ACF), delay mutual information
(DMI) and entropy (PE) is arranged to compare the result of elimination.As shown in figs 6-8, the chaotic signal generated for general ECSL, anti-
There are apparent relevant peaks at feedback delay.As shown in figs. 9-11, the time delay of the scheme proposed through the invention, external cavity feedback is special
Sign is effectively eliminated.
In conclusion broadband chaotic laser light proposed by the invention, which generates scheme, following benefit: (1) possess high bandwidth,
Frequency spectrum flatness is high；(2) external cavity semiconductor laser delay characteristics as caused by external cavity feedback are eliminated；(3) amplitude distribution
Symmetry is obviously improved.Therefore, it is applied in secret communication, the safety of transmission rate and chaotic carrier can be improved
Property.By the broadband chaos applications in random number, as the physics entropy source of randomizer, the speed for generating random number can be promoted
Rate, and complicated post-processing approach is not needed to eliminate the influence of delay characteristics.In addition it can be mentioned using the Chaotic Wideband Signal
The distance resolution of radar detection is risen, while the elimination of delay characteristics improves safety and the anti-interference ability of radar system.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein " or/and " it include one or more phases
Any and all combinations of the listed item of pass.
Only several embodiments of the present invention are expressed for above embodiments, and the description thereof is more specific and detailed, but can not
Therefore limitations on the scope of the patent of the present invention are interpreted as.It should be pointed out that for those of ordinary skill in the art,
Without departing from the inventive concept of the premise, multiple modification and improvement can also be made, these belong to protection model of the invention
It encloses.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (8)
1. the chaotic laser light production method that a kind of high bandwidth and time delay label are hidden, which is characterized in that in traditional cavity semiconductor
In the feedback loop of laser (ECSL), phase modulation module and time delay interferometer are sequentially added；The time delay interferometer it is defeated
Light is divided into two-way out: laser is injected back after attenuator as feedback light all the way；Another way is further classified as two sons
Road: a sub- road is converted to electrical domain chaotic signal by photodetector, and the electrical domain chaotic signal is made after amplifier amplifies
It inputs, is formed from CHAOTIC PHASE MODULATED for the radio frequency of the phase modulation module；Another sub- road is mixed as the broadband finally generated
Ignorant laser.
2. the chaotic laser light production method that a kind of high bandwidth according to claim 1 and time delay label are hidden, feature exist
In, it is described in the feedback loop of traditional external cavity semiconductor laser (ECSL), it sequentially adds phase modulation module and delay is dry
Interferometer includes:
The output light of Distributed Feedback Laser is input to progress electric light phase tune in the phase-modulator after an optical circulator
System, the output light of the phase-modulator are input to the time delay interferometer being made of two sections of different length optical fiber.
3. the chaotic laser light production method that a kind of high bandwidth according to claim 1 and time delay label are hidden, feature exist
In the output light of the time delay interferometer is divided into the output that two-way includes: interferometer and is divided into two parts through photo-coupler.
4. the chaotic laser light production method that a kind of high bandwidth according to claim 1 and time delay label are hidden, feature exist
In attenuator is passed through in the output of the time delay interferometer all the way and optical circulator is then injected into back laser, believes as feedback light
Number.
5. the chaotic laser light production method that a kind of high bandwidth according to claim 1 and time delay label are hidden, feature exist
In the phase modulation module is common electro-optic phase modulator.
6. the chaotic laser light production method that a kind of high bandwidth according to claim 1 and time delay label are hidden, feature exist
In the phase modulation module can use Mach-Zehnder modulators (MZM) or electro-optic phase modulator.
7. the chaotic laser light production method that a kind of high bandwidth according to claim 1 and time delay label are hidden, feature exist
In the time delay interferometer can use Mach-Zender interferometer (MZI), polarized interferometer, Sagnac interferometer, mikey
Er Xun (Michelson) interferometer or Fabry-Perot (Fabry-Perot) interferometer.
8. the chaotic laser light generation system that a kind of high bandwidth and time delay label are hidden, which is characterized in that the system comprises first
Signal circuit and second signal circuit: the first signal circuit includes Distributed Feedback Laser, optical circulator, phase-modulator, delay interference
Instrument and optical attenuator；Second signal circuit is the radiofrequency signal circuit being made of photodetector and electron-amplifier；
The output light of Distributed Feedback Laser is input to progress electric light phase-modulation, phase in phase-modulator after an optical circulator
The output light of position modulator is input to the time delay interferometer being made of two sections of different length optical fiber, the time delay interferometer it is defeated
It is divided into two parts through photo-coupler out；A portion successively passes through attenuator and optical circulator is then injected into back laser, makees
For light signal fed back；Another part again passes by photo-coupler and is divided into two sub- road optical signals: wherein a sub- road is generated as final
Broadband chaotic laser light, another sub- road is converted to electric signal by photodetector, then makees after electron-amplifier amplifies
It is inputted for the radio frequency of phase-modulator.
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Cited By (6)
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| CN110112646A (en) * | 2019-04-17 | 2019-08-09 | 电子科技大学 | A kind of chaotic laser light signal generating method and system that time delay label is hiding |
| CN110571641A (en) * | 2019-08-27 | 2019-12-13 | 太原理工大学 | method and device for suppressing chaotic time delay by using broadband spontaneous emission quantum noise |
| CN111653932A (en) * | 2020-05-14 | 2020-09-11 | 太原理工大学 | Chaotic laser device based on light injection amplified spontaneous emission suppression time delay |
| CN113595729A (en) * | 2021-04-21 | 2021-11-02 | 电子科技大学 | Multi-path physical random number generation method and system based on broadband laser chaotic source |
| CN115037374A (en) * | 2022-04-28 | 2022-09-09 | 苏州大学 | Broadband double-path polarization chaotic laser generation method and device |
| CN117199991A (en) * | 2023-06-30 | 2023-12-08 | 无锡芯光互连技术研究院有限公司 | Chaotic laser, multi-optical path introducing assembly and integrated chip thereof |
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