CN103401130B - Based on the light feedback chaos laser of chirped fiber grating - Google Patents
Based on the light feedback chaos laser of chirped fiber grating Download PDFInfo
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- CN103401130B CN103401130B CN201310324865.9A CN201310324865A CN103401130B CN 103401130 B CN103401130 B CN 103401130B CN 201310324865 A CN201310324865 A CN 201310324865A CN 103401130 B CN103401130 B CN 103401130B
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Abstract
A kind of light feedback chaos laser based on chirped fiber grating is that laser exports continuous light successively through Polarization Controller, fiber coupler and optical attenuator injection chirped fiber grating; The reverberation that time of delay of obtaining is corresponding with optical frequency after chirped fiber grating reflection, again through optical attenuator, fiber coupler and Polarization Controller former road return laser light device, causes disturbance to laser, moves in circles, and generation is without the chaotic laser light of delay character; This laser completely eliminates the delay character of light feedback chaos laser, improves the randomness of the confidentiality of chaotic communication, the accuracy of chaos laser range-measurement and random number, can be applicable to the fields such as communication, remote sensing, sensing.
Description
Technical field
The present invention is relevant with light feedback chaos laser, utilizes chaotic signal that chirped fiber grating produces as light feedback element without delay characteristics information.This chaotic signal can improve the confidentiality of chaotic communication, the accuracy of range finding and the randomness of random number, can be applicable to communication, sensing, the fields such as remote sensing.
Background technology
Chaotic laser light has high bandwidth and noise like characteristic, is widely used in secure communication, laser radar, optical time domain transmitter, optical coherence tomography, fast randomizer etc.
Chaotic laser light is by obtaining laser external disturbance.The method that tradition produces has specular light to feed back, and light injects, photoelectricity modulation etc.Wherein specular light feedback chaos laser enjoys favor in the application because its structure is simple, be easy to the advantages such as regulation and control.But traditional mirror light feedback chaos laser is, while the application of chaotic laser light offers convenience, also have unfavorable factor-delay character.So-called delay character refers to that the chaotic laser light that laser exports can carry relevant information long with feedback cavity, time domain presents weak periodicity, secondary lobe appears in autocorrelator trace.The existence of this delay character has a strong impact on the application quality of chaotic laser light.Such as, the randomness etc. of the certainty of measurement reducing chaos laser range-measurement, the confidentiality threatening chaotic communication, the quick randomizer of destruction chaotic laser light.
For above problem, many scholars propose the method for multiple improvement mirror feedback to optimize specular light feedback chaos laser, to reach the effect suppressing or hide its delay character.Such as, georgia ,u.s.a Institute of Technology D.Rontani proposes for single chamber feedback semiconductor laser, when feedback delay is close to the laser relaxation oscillation cycle, delay characteristics can be hidden (OpticsLetters, Vol.32, p.2960-2962,2007); Southwestern China university Xia Guang fine jade seminar proposes, for two external cavity feedback semiconductor laser, when the feedback delay of two exocoels and relaxation oscillation cycle meet particular kind of relationship, delay characteristics is by suppressed (OpticsExpress, Vol.17, p.20124-20133,2009).Because laser relaxation oscillation is subject to the impact of bias current and feedback intensity, two kinds of methods of climbing the tree need strict parameter matching, limit chaotic dynamical model scope.In addition, British Wales university Shore teaches numerically modeling modulation time delay feedback method, but the method needs to carry out polymorphic to time delay, and quick Stochastic Modulation could hide delay characteristics, and this needs high-speed modulator and random signal source, complex structure, be difficult to realize (Opticscommunications, vol.282, p.3568-3572,2009).I.Fischer professor and professor Pan Wei in succession propose polarization rotation feedback suppress delay characteristics, and this method needs in feedback cavity, add polarization rotator, make complex structure (OpticsLetters, Vol.36, p.4632
-4634，2011；OpticsCommunications，Vol.284，p.5758-5765，2011）。
Before this, inventors herein propose and utilize the single scattering object providing continuous backward scattered scattering object or provide continuous back scattering also to amplify as feedback cavity, completely eliminate the delay character of light feedback semiconductor laser, wherein the continuous backward scattered scattering object of single generation is the one of optical fiber, thin-film waveguide and flat waveguide, and the scattering object that the continuous back scattering of single generation is also amplified is the combination of doped fiber and pump laser.The old bodyguard person of outstanding talent of City University of Hong Kong proposes to utilize without chirped fiber grating as light feedback element (IEEEPhotonicsJournal, Vol.4, p.1930-1935), the mirror feedback method providing local light to feed back with tradition utilizes point lighting provided within the scope of grating length without chirped fiber grating to feed back unlike the method, thus makes the auto-correlation near feedback delay time obtain broadening and suppression.And owing to combining enhancing without chirped fiber grating dispersion, delay character reduces along with the reduction without chirped fiber grating bandwidth, but the feedback delay time of different frequency light is identical in the method, namely feedback delay and frequency have nothing to do, and the effect reached to suppress light feedback delay characteristic and can not eliminate completely.For this problem, inventors herein propose and utilize chirped fiber grating as light feedback element, thering is provided on point basis of lighting feedback, the light of different frequency has different feedback delay time after chirped fiber grating feedback, and namely feedback delay time is relevant with frequency.Light feedback delay characteristic thoroughly can be eliminated within the scope of chirped fiber grating actual parameter.
Summary of the invention
The present invention is to solve the technical problem of light feedback chaos laser delay character, and provide a kind of light feedback chaos laser based on chirped fiber grating.
The present invention is achieved by the following technical solutions.
Based on a light feedback chaos laser for chirped fiber grating, comprise laser, Polarization Controller, fiber coupler, optical attenuator and chirped fiber grating; It is characterized in that:
Laser exports continuous light and injects chirped fiber grating through Polarization Controller, fiber coupler and optical attenuator successively; The reverberation that time of delay of obtaining is corresponding with optical frequency after chirped fiber grating reflection, again through optical attenuator, fiber coupler and Polarization Controller former road return laser light device, causes disturbance to laser, moves in circles, and generation is without the chaotic laser light of delay character;
The chirp value of described chirped fiber grating is: 2*10
-4-8*10
-4nm/cm, dispersion measure is: 1650-2100ps/nm, and three dB bandwidth is: 0.4-0.6nm, and centre wavelength is: 1550nm, and reflectivity is: 85%-92%, and side mode suppression ratio is: 30-40dB, and modulation depth is: 10
-5-10
-3.
Wherein, described laser is the Distributed Feedback Laser exporting continuous light; The chirp coefficient of described chirped fiber grating is linear.
Realize a kind of light feedback chaos laser based on chirped fiber grating that the present invention is above-mentioned provided, compared with prior art, that it directly brings and advantage that is that certainly lead to and good effect are: this laser completely eliminates the delay character of light feedback chaos laser, improve the randomness of the confidentiality of chaotic communication, the accuracy of chaos laser range-measurement and random number, can be applicable to the fields such as communication, remote sensing, sensing.
Accompanying drawing explanation
Fig. 1 is the structural representation of the light feedback chaos laser based on chirped fiber grating.
Fig. 2 is the structural representation of the light feedback chaos laser of the embodiment of the present invention.
Fig. 3 be the chaotic laser light of specular light reponse system output from correlation diagram,
Fig. 4 is that the chaotic laser light utilizing linear chirp optical fiber grating to obtain as reflection end exports
Autocorrelogram.
Embodiment
Below the specific embodiment of the present invention is further illustrated.
As described in Figure 2, implement a kind of light feedback chaos laser based on chirped fiber grating provided by the present invention, comprise Distributed Feedback Laser, Polarization Controller, fiber coupler, optical attenuator and chirped fiber grating; Its structure composition is: Distributed Feedback Laser 1 exports continuous light and injects chirped fiber grating 5 through Polarization Controller 2, fiber coupler 3 and optical attenuator 4 successively; The reverberation that time of delay of obtaining is corresponding with optical frequency after chirped fiber grating 5 reflects returns Distributed Feedback Laser 1 through optical attenuator 4, fiber coupler 3 and the former road of Polarization Controller 2 again, disturbance is caused to Distributed Feedback Laser 1, move in circles, produce the chaotic laser light without delay character
The basic reason that traditional mirror light feedback device effectively can not eliminate delay character is that the linear reflective of minute surface makes each frequency content of feedback light experience identical time delay, form consistent exocoel mode of resonance, and rely on increase mirror surface to form multiple external cavity feedback, be difficult to eliminate delay character at all.City University of Hong Kong old bodyguard person of outstanding talent analyzes the time delay delay characteristics that even Fiber Bragg Grating FBG feedback semiconductor laser produces, compared with feeding back with traditional mirror light, delay character decreases but fails to eliminate, the even Fiber Bragg Grating FBG reflectance spectrum used can see T.Erdogan, J.LightwaveTechnol., 15 (8), 1277-1294, 1997, be worth us it is to be noted that near centre wavelength, the reflection delay time of the light of different wave length is identical and we know that the dispersion of uniform fiber grating is almost nil, thus obvious exocoel mode of resonance can be produced.
Adopt chirped fiber grating as external feedback element in the present invention, the reflectance spectrum of linearly chirped fiber Bragg grating and group delay spectrum can see T.Erdogan, J.LightwaveTechnol., 15 (8), 1277-1294,1997, can find out that time of delay and wavelength meet linear relationship, chirped fiber grating dispersion measure is very strong, thus the group delay utilizing it to produce and strong dispersion can eliminate consistent exocoel mode of resonance, thus generation chaotic laser light no longer has delay character.
Because light source is DFB semiconductor laser, use for reference the Lang-Kobayashi rate equations model of traditional light feedback semiconductor laser, can set up the kinetic theory model of chirped fiber grating feedback laser, its model is as follows:
The change of what formula (1) described is semiconductor laser light field complex amplitude E under the disturbance of chirped fiber grating reverberation, the change of what formula (2) described the is light field complex amplitude F of chirped fiber grating reverberation, what formula (3) described is the change of the inner carrier density N of semiconductor laser under the disturbance of chirped fiber grating reverberation.In formula the physical meaning of each parameter and numerical value as follows: linewidth enhancement factor α=2, light field restriction factor Г=0.24, transparent carrier density
n 0=0.455*10
24m
-3, photon lifetime τ
p=1.17ps, carrier lifetime τ
n=2.5ns, reflectivity
γ=11.18*10
9s
-1, fiber grating three dB bandwidth Λ=0.4-0.6nm, exocoel τ=3ns two-way time, bias current
i=1.75ith, threshold current ith=0.022A, unit charge amount e=1.6*10
-9c, the active volume
v=3.24*10
-16m
3, differential gain coefficient
g=1.414*10
-3um
3ns
-1, gain saturation coefficient ε=5*10
-5um
3, frequency detuning Δ ε=-2.05GHz.The parameter of chirped fiber grating: chirp value: 2*10
-4-8*10
-4nm/cm, dispersion measure: 1650-2100ps/nm, centre wavelength: 1550nm, reflectivity: 85%-92%, side mode suppression ratio: 30-40dB, modulation depth: 10
-5-10
-3.
Within the scope of above-mentioned parameter, the light field complex amplitude that the time of delay that formula (2) obtains after representing the reflection of industry chirped fiber grating is corresponding with frequency, and then direct and indirect disturbance is produced to carrier density in semiconductor laser complex amplitude in formula (1) and formula (3), because each frequency content of feedback light is different for time of delay, the disturbance that noise spectra of semiconductor lasers produces is not identical yet, thus consistent exocoel mode of resonance can not be formed, the final chaotic laser light produced without delay character.
Fig. 3,4 is chaotic laser light autocorrelogram, wherein Fig. 3 is that the chaotic laser light of specular light reponse system is output from correlation diagram, the autocorrelogram of the chaotic laser light output that the old bodyguard person of outstanding talent of City University of Hong Kong utilizes uniform fiber grating to obtain as reflection end can see IEEEPhotonicsJournal, 4(5), 2012, Fig. 4 is the autocorrelogram of the chaotic laser light output that applicant utilizes linear chirp optical fiber grating to obtain as reflection end.Clearly can see that main peak both sides have multiple sharp keen spike to occur from Fig. 3, illustrate that traditional specular light reponse system exists delay character.Autocorrelogram delay character compared with traditional mirror light reponse system that the old bodyguard person of outstanding talent of port City University utilizes uniform fiber grating to export as the chaotic laser light that reflection end obtains decreases but fails to eliminate.As can be seen from Figure 4, compare with the light reponse system of uniform fiber grating as reflection end with traditional mirror light reponse system, delay character is eliminated completely.
Here need it is noted that the effect shown in Fig. 4 can be obtained must meet above-mentioned parameter scope.
Claims (1)
1., based on a light feedback chaos laser for chirped fiber grating, comprise laser, Polarization Controller, fiber coupler, optical attenuator and chirped fiber grating; It is characterized in that:
Laser (1) exports continuous light and injects chirped fiber grating (5) through Polarization Controller (2), fiber coupler (3) and optical attenuator (4) successively; The reverberation that time of delay of obtaining is corresponding with optical frequency after chirped fiber grating (5) reflection is again through optical attenuator (4), fiber coupler (3) and Polarization Controller (2) former road return laser light device (1), disturbance is caused to laser (1), move in circles, produce the chaotic laser light without delay character;
The chirp value of described chirped fiber grating (5): 2*10
-4-8*10
-4nm/cm, dispersion measure: 1650-2100ps/nm, three dB bandwidth: 0.4-0.6nm, centre wavelength: 1550nm, reflectivity: 85%-92%, side mode suppression ratio: 30-40dB, modulation depth: 10
-5-10
-3;
Described laser (1) is the Distributed Feedback Laser exporting continuous light;
The chirp coefficient of described chirped fiber grating (5) is linear.
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| CN112332208B (en) * | 2020-10-30 | 2021-09-03 | 武汉理工大学 | Low-delay characteristic chaotic laser signal generating device and method |
| CN112713505B (en) * | 2021-01-29 | 2022-03-15 | 太原理工大学 | Device and method for restraining chaotic laser delay characteristics by utilizing differential group delay |
| CN116774468B (en) * | 2023-08-17 | 2023-11-10 | 上海频准激光科技有限公司 | Control device and control method for optical pulse output sequence |
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| CN102280815A (en) * | 2011-07-16 | 2011-12-14 | 太原理工大学 | Optical feedback chaos laser |
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