CN104954120A - Pure phase based optical encryption-decryption system - Google Patents
Pure phase based optical encryption-decryption system Download PDFInfo
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- CN104954120A CN104954120A CN201510243069.1A CN201510243069A CN104954120A CN 104954120 A CN104954120 A CN 104954120A CN 201510243069 A CN201510243069 A CN 201510243069A CN 104954120 A CN104954120 A CN 104954120A
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Abstract
A pure phase based optical encryption-decryption system comprises optical devices including optical devices such as a coherent light source. Light beams outputted by the coherent light source are split into two paths through a collimation system and a 3dB optical beam splitter; the light beam in one path passes through a first polarization rotator and a phase generator sequentially, and a phase generator control module connected with the phase generator applies a control program to the phase generator so as to complete pure-phase encryption of whole optical information; the light beam in the other path passes through a second polarization rotator, a phase recovery generator and a third polarization rotator; the light beam encrypted through the phase generator and the light beam transmitted by the third polarization rotator are combined on an optical beam combiner; the combined light beam enters a photoelectric detection module through a polarizer; the photoelectric detection module converts optical signals into electric signals which are sent to the phase recovery control module by means of servo, and the phase recovery control module realizes recovery of required wavefront information on the basis of certain evaluation functions and optimization algorithms. The pure phase based optical encryption-decryption system has the advantages of high safety, quickness and convenience in information encryption and decryption.
Description
Technical field
The invention belongs to optical Information Processing field, relate to one and realize pure phase bit-type optical encryption-decryption system.
Background technology
Along with the fast development of computer networking technology, it is an important subject under discussion that information security issue has highlighted, and obtains the extensive concern of domestic and international researcher.With tradition based on electronically information security technology compared with, the advantages such as information capacity is large, high-speed parallel that adopt optical information security technology to have.In addition, there is due to trimmed book body the multiple information such as amplitude, frequency, phase place, polarization, therefore, adopt optical information be encrypted-deciphering itself has the potentiality of high security.At present, be encrypted for employing optical information-decipher, domestic and international researcher has proposed the way of much information encrypt-decrypt, mainly comprises the encrypt-decrypt method based on Double random phase, the encrypt-decrypt method based on Fourier Transform of Fractional Order, the information encryption-decryption method based on Fresnel transform, the information encryption-decryption method based on joint transform principle and the information encryption-decryption method etc. based on Digital Holography.But, mainly there is following shortcoming in above-mentioned information encryption-decryption method: (1) is for above-mentioned most information encrypt-decrypt method, the coding result that its encryption obtains is generally complex amplitude form, both the coding of amplitude information had been comprised, also the coding of phase information is comprised, the inconvenience that this just must result in record, code information is conciliate in transmission; (2) for above-mentioned most information encrypt-decrypt method, whole encrypt-decrypt system is generally based on 4f system, and whole system is relatively complicated, and high to the exacting alignment requirements of each component locations; (3) flexibility of above-mentioned various its encrypt-decrypt system of encrypt-decrypt method is relatively poor.
Summary of the invention
For the deficiency that prior art exists, the object of this invention is to provide a kind of optical encryption-decryption system based on pure phase bit-type, to solve in conventional information encrypt-decrypt method deficiencies such as recording, transfer encoding information is inconvenient, encrypt-decrypt system flexibility is relatively poor, realize the high security of information encryption-deciphering, rapidity and convenience.
Technical scheme of the present invention is,
Based on optical encryption-decryption system of pure phase bit-type, comprise coherent source, colimated light system, 3dB optical beam-splitter, polarization rotator, phase generator, phase generator control module, phase retrieval maker, optics bundling device, the polarizer, photoelectric detection module and phase recovery control module;
First the light beam that coherent source exports is exported by colimated light system collimation, is injected into 3dB optical beam-splitter subsequently; The light beam that collimation exports is divided into two bundles according to the splitting ratio of 50:50 by 3dB optical beam-splitter; One road light beam incides phase generator through the first polarization rotator, phase generator is connected with phase generator control module, control program is applied to phase generator by phase generator control module, the optical information of to be encrypted-deciphering is converted to pure phase information according to certain coded system by phase generator control module on the one hand, is applied on phase generator; On the other hand, phase generator control module produces the pure phase position key be encrypted optical information, is applied on phase generator; Like this, the optical information hiding of to be encrypted-deciphering completes the pure phase bit encryption to whole optical information in the key of pure phase position; Another road light beam after 3dB optical beam-splitter incides phase retrieval maker after the second polarization rotator, reflexes to the 3rd polarization rotator subsequently; Light beam after phase generator encryption and the light beam of the 3rd polarization rotator transmission synthesize on optics bundling device; Light beam after synthesis incides photoelectric detection module after the polarizer; Light signal is converted to the signal of telecommunication by photoelectric detection module, and servo is to phase recovery control module subsequently; Phase recovery control module constantly adjusts the wavefront distribution on phase retrieval maker based on certain evaluation function and optimized algorithm, realize the recovery to required wavefront information; By the wavefront of recovery final on phase retrieval maker and the key of encryption system are subtracted each other, just can decipher and obtain real optical information.
Coherent source of the present invention is the laser seed source of a single-frequency, single polarization, and laser seed Source Type is not limit, and can be the dissimilar laser seed sources such as solid state laser, gas laser, fiber laser; The output wavelength of seed source is not limit;
Colimated light system implementation of the present invention is various, can be single collimating lens, also can be the colimated light system that poly-lens combines; In colimated light system, the selection of lens material is not limit, and can be quartz material, K9 material etc.;
Its kind of 3dB optical beam-splitter of the present invention is not limit, and can be the Amici prism of polarization insensitive, the beam splitter etc. of polarization insensitive; The Material selec-tion of 3dB optical beam-splitter is not limit, and can be Yttrium Orthovanadate, calcite, barium metaborate, quartz material, K9 material etc.;
Polarization rotator type of the present invention is not limit, can be half-wave plate or other there is the device of polarization state spinfunction; Described polarization rotator material is not limit, and can be quartz material, K9 material etc.;
Phase generator of the present invention is the device producing desired phase distribution, and its implementation is not limit, and can adopt pure phase bit-type LCD space light modulator, and other also can be adopted can to produce the device of desired phase distribution;
PHASE DISTRIBUTION needed for phase generator control module of the present invention is produced by fast procedure control module control phase maker; Its effect is mainly reflected in two aspects: the optical information of to be encrypted-deciphering is converted to pure phase information (coded system such as according to certain coded system by (1), if to be encrypted-decipher optics information is a sub-picture, its intensity value ranges is 0-255, then can be corresponding according to certain proportionate relationship with the size of phase place between 0 to π by the gray value size of image), be applied on phase generator; (2) produce the pure phase position key that optical information is encrypted, be applied on phase generator;
Phase retrieval maker implementation of the present invention is not limit, and can adopt pure phase bit-type LCD space light modulator, and other also can be adopted can to control to produce according to algorithm the device of particular phases distribution;
Optics bundling device kind of the present invention and implementation are not limit, and can be the conjunction bundle sheet of the beam cementing prism of polarization insensitive, polarization insensitive, can be also polarization coupling sheet, polarization coupling prism etc., it specifically selects to determine according to actual system of building; The Material selec-tion of optics bundling device is not limit, and can be Yttrium Orthovanadate, calcite, barium metaborate, quartz material, K9 material etc.;
Polarizer implementation of the present invention is not limit, and can be the combination etc. of the neutral polarizer, half-wave plate and polarization beam apparatus; Its Material selec-tion is not limit, and can be quartz material, K9 material etc.;
The light signal received is converted to the signal of telecommunication by photoelectric detection module of the present invention, and its kind and responsive materials have multiple choices, only needs optical maser wavelength in its corresponding wave band;
Phase recovery control module of the present invention, according to the signal of telecommunication after photoelectric detection module conversion, realizes the recovery to required wavefront information based on certain evaluation function and optimized algorithm; Its evaluation function is chosen various, can be the PV value, extreme value etc. of the signal of telecommunication after photoelectric detection module conversion; In phase recovery control module, optimized algorithm implementation is various, can be simulated annealing, random paralleling gradient descent algorithm etc.
Advantageous Effects of the present invention:
1, the invention provides a kind of optical encryption-decryption system based on pure phase bit-type; Compared with being complex amplitude form with coding result in traditional optical information encryption, this system is only encoded to phase information, avoids in conventional information encrypt-decrypt technology problems such as recording, transfer encoding information is difficult;
2, compared with traditional optical information encrypt-decrypt technology, pure phase bit-type optical encryption provided by the invention-decryption system adopts optics coherence tomography system, avoids the complexity of carrying out optical information encrypt-decrypt based on 4f system;
3, pure phase bit-type optical encryption-decryption system implementation provided by the invention is various; According to principle schematic of the present invention, in systems in practice, the optics coherence tomography system of Mach – Zehnder interferometer type both can have been adopted to complete the deciphering of optical information, cross polarization synthesis system also can be adopted to complete the deciphering of optical information;
4, its optical information of pure phase bit-type optical encryption-decryption system deciphering provided by the invention is based on adaptive optimization algorithm, avoids the deciphering error that human factor causes; In adaptive optimization process, choosing of evaluation function has diversity, and choosing of optimized algorithm has diversity;
5, pure phase bit-type optical encryption provided by the invention-decryption system key selects to have very high flexibility.
Accompanying drawing explanation
Fig. 1 is system configuration principle schematic of the present invention.
In figure: 1, coherent source; 2, colimated light system; 3,3dB optical beam-splitter; 4-1, the first polarization rotator; 4-2, the second polarization rotator; 4-3, the 3rd polarization rotator; 5, phase generator; 6, phase generator control module; 7, phase retrieval maker; 8, optics bundling device; 9, the polarizer; 10, photoelectric detection module; 11, phase recovery control module.
Can be obtained by Fig. 1: in systems in practice, if optics bundling device 8 is the beam cementing prism of polarization insensitive or the conjunction bundle sheet of polarization insensitive, then whole optical encryption-decryption system is based on the optics coherence tomography system of Mach – Zehnder interferometer type; If optics bundling device 8 is polarization coupling sheet or polarization coupling prism, then whole optical encryption-decryption system is based on cross polarization synthesis system.
Embodiment
With reference to accompanying drawing 1, for the structure principle chart of a kind of optical encryption-decryption system based on pure phase bit-type of the present invention, as shown in the figure, native system comprises coherent source 1, colimated light system 2,3dB optical beam-splitter 3, first polarization rotator 4-1, the second polarization rotator 4-2, the 3rd polarization rotator 4-3, phase generator 5, phase generator control module 6, phase retrieval maker 7, optics bundling device 8, the polarizer 9, photoelectric detection module 10 and phase recovery control module 11;
First the light beam that coherent source 1 exports collimates through colimated light system 2 and exports, and is injected into 3dB optical beam-splitter 3 subsequently.3dB optical beam-splitter 3 is divided into two bundles by the light beam equal proportion of collimation output; One road light beam incides phase generator 5 through the first polarization rotator 4-1.Due to for the phase generator 5 based on pure phase bit-type LCD space light modulator, generally, it carries out phase-modulation to a specific polarization direction, therefore, in practical operation, by rotating the first polarization rotator 4-1, make the polarization state of light beam after the first polarization rotator 4-1 consistent with the polarization state that phase generator 5 responds.Apply control program to phase generator 5 by phase generator control module 6, first the optical information of to be encrypted-deciphering is converted to pure phase information according to certain coded system, is applied on phase generator 5; And then phase generator control module 6 produces the pure phase position key be encrypted optical information, is applied on phase generator 5; The pure phase position key of optical information encryption both can be single random phase distribution, also can be to be undertaken combining the higher order aberratons produced by each rank Zernike aberration item to distribute; Both can be single corrugated, also can be the combination of multiple multi-form corrugated according to certain rule.Like this, the optical information of to be encrypted-deciphering is just hidden in the key of pure phase position, completes the pure phase bit encryption to whole optical information.
Another road light beam after 3dB optical beam-splitter 3 incides phase retrieval maker 7 after the second polarization rotator 4-2.By rotating the second polarization rotator 4-2, make the polarization state of light beam after the second polarization rotator 4-2 consistent with the polarization state that phase retrieval maker 7 responds.The light beam that phase retrieval maker 7 reflects is injected into optics bundling device 8 after the 3rd polarization rotator 4-3 transmission, synthesizes on optics bundling device 8 with the light beam after encrypting through phase generator 5.3rd polarization rotator 4-3, based on different optics coherence tomography systems, regulates the polarization state participating in the two-way light beam synthesized on optics bundling device 8.Specifically, if optics bundling device 8 is the beam cementing prism of polarization insensitive or the conjunction bundle sheet of polarization insensitive, namely whole optical encryption-decryption system is based on the optics coherence tomography system of Mach – Zehnder interferometer type, then by adjustment the 3rd polarization rotator 4-3, make the polarization state of the two-way light beam participating in synthesis consistent, realize best relevant effect; If optics bundling device 8 is polarization coupling sheet or polarization coupling prism, namely whole optical encryption-decryption system is based on cross polarization synthesis system, then by adjustment the 3rd polarization rotator 4-3, make the polarization state of the two-way light beam participating in synthesis orthogonal, realize follow-up cross polarization synthesis.Light beam after optics bundling device 8 synthesizes incides photoelectric detection module 10 after the polarizer 9.
If the link carrying out optical information encryption is light beam 1, the link carrying out phase retrieval is light beam 2, for the optics coherence tomography system based on Mach – Zehnder interferometer type, in systems in practice, the polarizer 9 can save, and now, the light intensity of closing after bundle can be expressed as:
Wherein: I
1(x, y, Z
1) and I
2(x, y, Z
2) be respectively participate in synthesis two-way light beam in the light distribution of sensing point, Z
1and Z
2be respectively light beam 1 and light beam 2 from coherent source 1 to the light path of sensing point,
with
be respectively the PHASE DISTRIBUTION of two-way light beam at sensing point of participation synthesis.
For the encrypt-decrypt system based on cross polarization synthesis system, if the larization rotation angle of the polarizer 9 is θ, then the light distribution after the polarizer 9 is expressed as:
Can be obtained by formula (1) and (2): between the light signal strength that photoelectric detection module 10 receives with the two-way light beam participating in synthesizing, the cosine value of phase difference becomes positive correlation.In real system is built, as long as ensure that phase generator 5 is equal to the distance of optical beam-splitter 8 with phase retrieval maker 7 to the distance of optics bundling device 8, then can be obtained by whole encrypt-decrypt system principle schematic diagram: when the PHASE DISTRIBUTION on phase retrieval maker 7 is equal with the PHASE DISTRIBUTION (comprising the to be encrypted-optical information of deciphering and encryption key) on phase generator 5, just can obtain best relevant effect.Therefore, the coherent signal that photoelectric detection module 10 receives just can as the evaluation function of phase recovery.
In systems in which, first the light signal of two-way beam interference is converted to voltage fluctuation by photoelectric detection module 10, subsequently by conversion after voltage signal servo to phase recovery control module 11; Phase recovery control module 11 based on certain evaluation criterion (such as, the PV value can choosing interference fluctuating signal is maximum as standard), continuous iteration performs the wavefront distribution on optimized algorithm adjustment phase retrieval maker 8, until reach optimal result.After phase retrieval algorithm is finished, by the encryption system key that the PHASE DISTRIBUTION of recovery final on phase retrieval maker 8 and phase generator 5 apply is subtracted each other, just can deciphers and obtain real optical information.
More than contain the explanation of the preferred embodiment of the present invention; this is to describe technical characteristic of the present invention in detail; be not want summary of the invention to be limited in the concrete form described by embodiment, other amendments carried out according to content purport of the present invention and modification are also protected by this patent.The purport of content of the present invention defined by claims, but not defined by the specific descriptions of embodiment.
Claims (10)
1. optical encryption-the decryption system based on pure phase bit-type, it is characterized in that, comprise coherent source, colimated light system, 3dB optical beam-splitter, polarization rotator, phase generator, phase generator control module, phase retrieval maker, optics bundling device, the polarizer, photoelectric detection module and phase recovery control module;
First the light beam that coherent source exports is exported by colimated light system collimation, is injected into 3dB optical beam-splitter subsequently; The light beam that collimation exports is divided into two bundles according to the splitting ratio of 50:50 by 3dB optical beam-splitter; One road light beam incides phase generator through the first polarization rotator, phase generator is connected with phase generator control module, control program is applied to phase generator by phase generator control module, the optical information of to be encrypted-deciphering is converted to pure phase information according to certain coded system by phase generator control module on the one hand, is applied on phase generator; On the other hand, phase generator control module produces the pure phase position key be encrypted optical information, is applied on phase generator; Like this, the optical information hiding of to be encrypted-deciphering completes the pure phase bit encryption to whole optical information in the key of pure phase position; Another road light beam after 3dB optical beam-splitter incides phase retrieval maker after the second polarization rotator, reflexes to the 3rd polarization rotator subsequently; Light beam after phase generator encryption and the light beam of the 3rd polarization rotator transmission synthesize on optics bundling device; Light beam after synthesis incides photoelectric detection module after the polarizer; Light signal is converted to the signal of telecommunication by photoelectric detection module, and servo is to phase recovery control module subsequently; Phase recovery control module constantly adjusts the wavefront distribution on phase retrieval maker based on certain evaluation function and optimized algorithm, realize the recovery to required wavefront information; By the wavefront of recovery final on phase retrieval maker and the key of encryption system are subtracted each other, just can decipher and obtain real optical information.
2. optical encryption-the decryption system based on pure phase bit-type according to claim 1, is characterized in that: coherent source is the laser seed source of a single-frequency, single polarization; Laser seed source is solid state laser, gas laser or fiber laser.
3. optical encryption-the decryption system based on pure phase bit-type according to claim 1, is characterized in that: colimated light system is the colimated light system that single collimating lens or poly-lens combine; In colimated light system, lens material is quartz material or K9 material.
4. optical encryption-the decryption system based on pure phase bit-type according to claim 1, is characterized in that: 3dB optical beam-splitter is the Amici prism of polarization insensitive or the beam splitter of polarization insensitive; The making material of 3dB optical beam-splitter is Yttrium Orthovanadate, calcite, barium metaborate, quartz material or K9 material.
5. optical encryption-the decryption system based on pure phase bit-type according to claim 1, is characterized in that: polarization rotator is half-wave plate.
6. optical encryption-the decryption system based on pure phase bit-type according to claim 1, is characterized in that: phase generator is the device producing desired phase distribution, and phase generator adopts pure phase bit-type LCD space light modulator.
7. optical encryption-the decryption system based on pure phase bit-type according to claim 1, it is characterized in that: phase retrieval maker is the device that can control to produce according to algorithm desired phase distribution, and phase generator adopts pure phase bit-type LCD space light modulator.
8. optical encryption-the decryption system based on pure phase bit-type according to claim 1, is characterized in that: optics bundling device is the beam cementing prism of polarization insensitive, the conjunction bundle sheet of polarization insensitive, polarization coupling sheet or polarization coupling prism; The material of optics bundling device is Yttrium Orthovanadate, calcite, barium metaborate, quartz material or K9 material.
9. optical encryption-the decryption system based on pure phase bit-type according to claim 1, is characterized in that: the polarizer is the combination of the neutral polarizer or half-wave plate and polarization beam apparatus; The material of the polarizer is quartz material or K9 material.
10. optical encryption-the decryption system based on pure phase bit-type according to claim 1, it is characterized in that: phase recovery control module, according to the signal of telecommunication after photoelectric detection module conversion, realizes the recovery to required wavefront information based on certain evaluation function and optimized algorithm; Its evaluation function is PV value or the extreme value of the signal of telecommunication after photoelectric detection module conversion; In phase recovery control module, optimized algorithm is simulated annealing or random paralleling gradient descent algorithm.
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| CN106411510A (en) * | 2016-10-28 | 2017-02-15 | 深圳大学 | Method and apparatus for obtaining equivalent key of random phase coding-based optical encryption system |
| CN106972921A (en) * | 2017-01-03 | 2017-07-21 | 北京理工大学 | The asymmetrical optical information safety system of double optical key is combined based on wavefront sensing |
| CN112166464A (en) * | 2018-05-29 | 2021-01-01 | 微软技术许可有限责任公司 | Cryptographic key creation using optical parameters |
| CN113644979A (en) * | 2021-06-25 | 2021-11-12 | 北京邮电大学 | Communication method and system based on phase rotation in overhead OPGW optical cable |
| CN113824509A (en) * | 2021-08-18 | 2021-12-21 | 北京邮电大学 | Ultra-long distance coherent optical communication method and system based on polarization state rotation |
| CN117055211A (en) * | 2023-08-30 | 2023-11-14 | 之江实验室 | Design method of optical encryption structure and near-far field multi-polarization optical encryption system |
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