CN103401130A - Chirped fiber grating-based optical feedback chaotic laser - Google Patents
Chirped fiber grating-based optical feedback chaotic laser Download PDFInfo
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- CN103401130A CN103401130A CN2013103248659A CN201310324865A CN103401130A CN 103401130 A CN103401130 A CN 103401130A CN 2013103248659 A CN2013103248659 A CN 2013103248659A CN 201310324865 A CN201310324865 A CN 201310324865A CN 103401130 A CN103401130 A CN 103401130A
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Abstract
The invention discloses a chirped fiber grating-based optical feedback chaotic laser. Continuous light is output by the laser and is injected into a chirped fiber grating through a polarization controller, a fiber coupler and an optical attenuator in sequence; the reflected light which is obtained by reflecting the light through the chirped fiber grating and has the delay time corresponding to optical frequency is returned to the laser through the optical attenuator, the fiber coupler and the polarization controller along the same way to cause disturbance to the laser; and chaotic laser without time delay characteristics is generated through repetitive cycles. According to the laser, the time delay characteristics of the optical feedback chaotic laser are completely eliminated, and the privacy of chaotic communication, the accuracy of chaotic laser ranging and the randomness of a random number are improved; and the laser can be applied to the fields such as communication, remote sensing and sensing.
Description
Technical field
The present invention is relevant with the light feedback chaos laser, utilizes chaotic signal that chirped fiber grating produces as the light feedback element without the time delay characteristic information.This chaotic signal can improve the confidentiality of chaotic communication, and 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, light time territory transmitter, optical coherence tomography, quick randomizer etc.
Chaotic laser light can be by obtaining the laser external disturbance.The method that tradition produces has the specular light feedback, and light injects, photoelectricity modulation etc.Wherein the specular light feedback chaos laser enjoys favor because it is simple in structure, be easy to the advantages such as regulation and control in application.But traditional mirror light feedback chaos laser is the application of chaotic laser light when offering convenience, and also has unfavorable factor-delay character.So-called delay character refers to that the chaotic laser light of laser output can carry and the long relevant information of feedback cavity, presents weak periodicity on time domain, occurs secondary lobe on autocorrelator trace.The existence of this delay character has a strong impact on the application quality of chaotic laser light.For example, reduce the certainty of measurement of chaos laser range-measurement, the confidentiality of threat chaotic communication, the randomness of the quick randomizer of destruction chaotic laser light etc.
For above problem, many scholars have proposed the method for multiple improvement mirror feedback and have optimized the specular light feedback chaos laser, to reach the effect that suppresses or hide its delay character.For example, the D.Rontani of the georgia ,u.s.a Institute of Technology proposes for single chamber feedback semiconductor laser, and near the laser relaxation oscillation during cycle, the time delay feature can be hidden (Optics Letters, Vol.32, p.2960-2962,2007) when feedback delay; Summer light fine jade seminar of Southwestern China university proposes, for two exocoel feedback semiconductor lasers, when the feedback delay of two exocoels and relaxation oscillation cycle meet particular kind of relationship, the time delay feature is with suppressed (Optics Express, Vol.17, p.20124-20133,2009).Be subjected to the impact of bias current and feedback intensity due to the laser relaxation oscillation, the two kinds of methods of climbing the tree need strict parameter matching, have limited the generation scope of chaos.In addition, the Shore of British Wales university professor numerical value has been studied the modulation time delay feedback method, but it is polymorphic that the method need to be carried out time delay, and Stochastic Modulation could be hidden the time delay feature fast, and this needs high-speed modulator and random signal source, complex structure, be difficult to realize (Optics communications,, vol.282, p.3568-3572,2009).I.Fischer professor and professor Pan Wei in succession propose polarization and rotate feedback inhibition time delay feature, and this method need to be added polarization rotator in feedback cavity, make complex structure (Optics Letters, Vol.36, p.4632
-4634，2011；Optics?Communications，Vol.284，p.5758-5765，2011）。
Before this, the inventor proposed to utilize single continuous backward scattered scattering object is provided or continuous back scattering is provided and the scattering object that amplifies as feedback cavity, thoroughly eliminated the delay character of light feedback semiconductor laser, wherein the continuous backward scattered scattering object of single generation is a kind of of optical fiber, thin-film waveguide and flat waveguide, and the continuous back scattering of single generation and the scattering object that amplifies are the combinations of doped fiber and pump laser.The pretty proposition of the old bodyguard of City University of Hong Kong utilized without chirped fiber grating as light feedback element (IEEE Photonics Journal, Vol.4, p.1930-1935), from tradition provide the mirror feedback method of local light feedback different to be the method utilization provide minute lighting feedback in the grating length scope without chirped fiber grating, thereby make near auto-correlation of feedback delay time obtain broadening and inhibition.And due to the enhancing of uniting without the chirped fiber grating dispersion, delay character reduces along with the reduction without the chirped fiber grating bandwidth, but in the method, the feedback delay time of different frequency light is identical, be feedback delay and frequency-independent, the effect that reaches is to suppress and can not eliminate fully light feedback delay characteristic.For this problem, the inventor has proposed to utilize chirped fiber grating as the light feedback element, providing on minute basis of lighting feedback, the light of different frequency has the different feedback delay time after the chirped fiber grating feedback, and namely the feedback delay Time And Frequency is relevant.Can thoroughly eliminate light feedback delay characteristic in chirped fiber grating actual parameter scope.
Summary of the invention
What the present invention will solve is the technical problem of light feedback chaos laser delay character, and a kind of feedback chaos laser of light based on chirped fiber grating is provided.
The present invention is achieved by the following technical solutions.
A kind of feedback chaos laser of light based on chirped fiber grating, comprise laser, Polarization Controller, fiber coupler, optical attenuator and chirped fiber grating; It is characterized in that:
Laser output continuous light injects chirped fiber grating through Polarization Controller, fiber coupler and optical attenuator successively; The time of delay that obtains after chirped fiber grating reflection, the reverberation corresponding with optical frequency be again through the former road of optical attenuator, fiber coupler and Polarization Controller return laser light device, and laser is caused disturbance, 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, three dB bandwidth is: 0.4-0.6nm, centre wavelength is: 1550nm, reflectivity is: 85%-92%, side mode suppression ratio is: 30-40dB, modulation depth is: 10
-5-10
-3
Wherein, described laser is the Distributed Feedback Laser of output continuous light; The chirp coefficient of described chirped fiber grating is linear.
The above-mentioned a kind of feedback chaos laser of light based on chirped fiber grating that provides of the present invention is provided, compared with prior art, its that directly bring and advantage that certainly lead to and good effect are: this laser has thoroughly been eliminated the delay character of light feedback chaos laser, improve the confidentiality of chaotic communication, the accuracy of chaos laser range-measurement and the randomness of random number, can be applicable to the fields such as communication, remote sensing, sensing.
Description of drawings
Fig. 1 is based on the structural representation of the light feedback chaos laser of chirped fiber grating.
Fig. 2 is the structural representation of the light feedback chaos laser of the embodiment of the present invention.
Fig. 3 is the chaotic laser light output autocorrelogram of specular light reponse system,
Fig. 4 is the chaotic laser light output that utilizes linear chirp optical fiber grating to obtain as reflection end
Autocorrelogram.
Embodiment
Below the specific embodiment of the present invention is further illustrated.
As described in Figure 2, implement a kind of feedback chaos laser of light 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 forms: Distributed Feedback Laser 1 output continuous light injects chirped fiber grating 5 through Polarization Controller 2, fiber coupler 3 and optical attenuator 4 successively; The reverberation corresponding with optical frequency time of delay that obtains after chirped fiber grating 5 reflections returns to Distributed Feedback Laser 1 through optical attenuator 4, fiber coupler 3 and the former road of Polarization Controller 2 again, Distributed Feedback Laser 1 is caused disturbance, move in circles, produce the chaotic laser light without delay character
The basic reason that traditional mirror light feedback device can not effectively be eliminated delay character is the identical time delay of each frequency content experience that the linear reflective of minute surface makes feedback light, form consistent exocoel mode of resonance, and rely on the increase mirror surface to form a plurality of exocoels feedbacks, be difficult to the basic delay character of eliminating.the old bodyguard person of outstanding talent of City University of Hong Kong has analyzed the time delay delay characteristics that even Fiber Bragg Grating FBG feedback semiconductor laser produces, compare with traditional mirror light feedback, delay character decreases but fails and eliminates, the even Fiber Bragg Grating FBG reflectance spectrum that uses can be referring to T. Erdogan, J. Lightwave Technol., 15 (8), 1277-1294, 1997, what be worth that we note is near centre wavelength, be identical reflection of light time of delay of different wave length and we know that the dispersion of uniform fiber grating is almost nil, thereby can produce obvious exocoel mode of resonance.
Adopt chirped fiber grating as the external feedback element in the present invention, the reflectance spectrum of linearly chirped fiber Bragg grating and group delay spectrum can be referring to T. Erdogan, J. Lightwave Technol., 15 (8), 1277-1294,1997, can find out that time of delay and wavelength meet linear relationship, the chirped fiber grating dispersion measure is very strong, thereby utilizes the group delay of its generation can eliminate consistent exocoel mode of resonance with strong dispersion, thereby produce chaotic laser light, no longer has delay character.
Because light source is the dfb semiconductor laser, use for reference the Lang-Kobayashi rate equation 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:
What formula (1) was described is the variation of semiconductor laser light field complex amplitude E under the disturbance of chirped fiber grating reverberation, what formula (2) was described is the variation of the catoptrical light field complex amplitude of chirped fiber grating F, and what formula (3) was described is the variation 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 are 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 3d B 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
In the above-mentioned parameter scope, the light field complex amplitude corresponding with frequency time of delay that obtains after the reflection of formula (2) expression industry chirped fiber grating, and then carrier density in semiconductor laser complex amplitude in formula (1) and formula (3) is produced direct and indirect disturbance, because each frequency content of feedback light is different time of delay, the disturbance that noise spectra of semiconductor lasers produces is not identical yet, thereby can not form consistent exocoel mode of resonance, the final chaotic laser light that produces without delay character.
Fig. 3,4 is the chaotic laser light autocorrelogram, wherein Fig. 3 is the chaotic laser light output autocorrelogram of specular light reponse system, the autocorrelogram that the chaotic laser light that the old bodyguard person of outstanding talent of City University of Hong Kong utilizes uniform fiber grating to obtain as reflection end is exported can be referring to IEEE Photonics Journal, 4(5), the autocorrelogram that 2012, Fig. 4 exports for the chaotic laser light that the applicant utilizes linear chirp optical fiber grating to obtain as reflection end.Can see clearly that from Fig. 3 the main peak both sides have a plurality of sharp keen spikes to occur, illustrate that there is delay character in traditional specular light reponse system.The autocorrelogram that the chaotic laser light that the old bodyguard person of outstanding talent of port City University utilizes uniform fiber grating to obtain as reflection end is exported is compared delay character and is decreased but fail elimination with traditional mirror light reponse system.As can be seen from Figure 4, with traditional mirror light reponse system, with uniform fiber grating, as the light reponse system of reflection end, compare, delay character is eliminated fully.
What need here to indicate is can obtain effect shown in Figure 4 must meet the above-mentioned parameter scope.
Claims (3)
1. the feedback chaos laser of the light based on chirped fiber grating, comprise laser, Polarization Controller, fiber coupler, optical attenuator and chirped fiber grating; It is characterized in that:
Laser (1) output continuous light passes through successively Polarization Controller (2), fiber coupler (3) and optical attenuator (4) and injects chirped fiber grating (5); The time of delay that obtains after chirped fiber grating (5) reflection, the reverberation corresponding with optical frequency was again through optical attenuator (4), fiber coupler (3) and Polarization Controller (2) former road return laser light device (1), laser (1) is caused disturbance, move in circles, produce the chaotic laser light without delay character;
The chirp value of described chirped fiber grating (5) is: 2*10
-4-8*10
-4Nm/cm, dispersion measure is: 1650-2100ps/nm, three dB bandwidth is: 0.4-0.6nm; Centre wavelength is: 1550nm, reflectivity is: 85%-92%, side mode suppression ratio is: 30-40dB, modulation depth is: 10
-5-10
-3
2. the feedback chaos laser of the light based on chirped fiber grating as claimed in claim 1 is characterized in that: described laser (1) is the Distributed Feedback Laser of output continuous light.
3. the feedback chaos laser of the light based on chirped fiber grating as claimed in claim 1, it is characterized in that: the chirp coefficient of described chirped fiber grating (5) is linear.
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| CN107086904A (en) * | 2017-05-23 | 2017-08-22 | 西南大学 | The Chaotic Wideband Signal generating means that centre wavelength is tunable |
| CN107565372A (en) * | 2017-09-20 | 2018-01-09 | 太原理工大学 | Chaotic laser light generation device without delay characteristics |
| CN107658693A (en) * | 2017-11-16 | 2018-02-02 | 太原理工大学 | A kind of single-chip integration chaos laser chip based on directional scatter feedback |
| CN107682091A (en) * | 2017-09-14 | 2018-02-09 | 电子科技大学 | A kind of latency hiding and spread spectrum system based on laser chaos automodulation |
| CN110797745A (en) * | 2019-11-12 | 2020-02-14 | 太原理工大学 | Broadband chaos generating device without time delay characteristic |
| CN111638529A (en) * | 2020-05-27 | 2020-09-08 | 太原理工大学 | Vehicle-mounted radar system based on true random number generator |
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| CN112332208A (en) * | 2020-10-30 | 2021-02-05 | 武汉理工大学 | Low-delay characteristic chaotic laser signal generating device and method |
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| CN107086904A (en) * | 2017-05-23 | 2017-08-22 | 西南大学 | The Chaotic Wideband Signal generating means that centre wavelength is tunable |
| CN107682091A (en) * | 2017-09-14 | 2018-02-09 | 电子科技大学 | A kind of latency hiding and spread spectrum system based on laser chaos automodulation |
| CN107682091B (en) * | 2017-09-14 | 2020-07-24 | 电子科技大学 | Time delay hiding and spread spectrum system and method for generating signal by using same |
| CN107565372A (en) * | 2017-09-20 | 2018-01-09 | 太原理工大学 | Chaotic laser light generation device without delay characteristics |
| CN107565372B (en) * | 2017-09-20 | 2019-09-20 | 太原理工大学 | Chaotic laser light generation device without delay characteristics |
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