CN105930131A - Ultrafast real-time optical true random pattern generator - Google Patents
Ultrafast real-time optical true random pattern generator Download PDFInfo
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Abstract
The invention discloses an ultrafast real-time optical true random pattern generator, which loads an ultrashort optical pulse sequence output by a mode-locking pulse laser to a control signal input end of an all-optical switch; meanwhile, a continuous chaos optical signal output by a laser chaos entropy source is input by a detection signal end of the all-optical switch, the all-optical switch finishes the downsampling of the chaos optical signal, and the optical pulse sequence is output; after sampling is carried out and a chaos optical pulse sequence is obtained to filter idle noise, the chaos optical pulse sequence is converted into a chaos electrical pulse sequence via a photoelectric detector, and the chaos electrical pulse sequence is loaded to the positive terminal of a differential comparator; a voltage signal output by a tunable constant voltage source serves as the negative terminal of the differential comparator; when the peak voltage of the chaos electrical pulse is greater than comparison voltage, the differential comparator outputs a high level "1" code, and otherwise, a low level "0" code is output, and the continuous and random high and low level forms a high-speed real-time optical true random code sequence. The real-time code rate is as high as 10 Gb/S order, and a current high-speed secret communication requirement is greatly met.
Description
Technical field
Present invention pattern generator truly random with one is relevant, a kind of truly random pattern generator of ultrafast real-time optical for information security and secret communication field.
Background technology
Random code has a wide range of applications in secret communication field.The generation of safe and reliable random code is related to numerous aspects such as national defense safety, financial stability, trade secret and individual privacy.
In secret communication, random code is typically utilized to be encrypted as double secret key cleartext information, to ensure the safe and reliable of transmitted information.The communication being kept absolutely secret must rely on " one-time pad " technology proposed by Shannon.Its basic thought is to utilize indecisive random cipher that cleartext information carries out " one to one " the even encryption of " many-one ", it is desirable to this password is only only used once and length is not shorter than length of the plaintext.In other words, the realization of the secret communication mode that is perfectly safe, it is desirable to code check be not less than the real random code of traffic rate a large amount of, produce in real time.
Utilize algorithm can produce quick random code, but it has periodically, can crack, and is pseudo noise code, it is impossible to being perfectly safe of guarantee information.Utilize physical accidental process as entropy source, the real random code that cannot be cracked can be produced, can fundamentally stop the generation of information leakage event.But, existing real random code product many employings thermal noise, as entropy source, is limited to the bandwidth bottleneck of conventional physical entropy source, and its code check is in Mb/s magnitude, huge with Modern High-Speed rate of information throughput gap.
In recent years, the appearance of this Wideband physics entropy source of chaotic laser light so that real random code generator obtains breakthrough development in terms of producing speed.2008, Nei Tianchun husband seminar of Japan utilized laser chaos entropy source on international well-known periodical Nature Photonics first, it is achieved that the generation online, real-time of 1.7 Gb/s real random codes [Nat. Photon., vol. 2,
pp. 728-732, 2008].2013, applicant place seminar utilize chaos laser successfully construct the fastest code check reach 4.5 Gb/s real random code generator [Opt. Express, 21 (17):
20452-20462, 2013]。
But, with regard to known to inventor, except above-mentioned two is in addition to the real-time random code of first technology report produces, and major part research is more theoretic discussion, and its method is all to realize by the time series of the physical process that experiment collects is carried out off-line process.Strictly, this processed offline method can only obtain and " counts " at random, and can not produce the random code of real-time continuous output.And the output in real time of random code generator is its necessary condition in communication encryption is applied.So far, inventor place seminar utilizes the real random code generator constructed by laser chaos still to remain the fastest record of real time rate of current real random code generation device in the world, i.e. 4.5 Gb/s.
Limit the essential technique reason that its real-time code rate promotes further to be: " the electronic jitter rate limit " that electricity ADC faces.Signal is sampled and during quantification treatment by specifically electronics ADC, is required to the driving of external electrical clock.And the most most advanced electric clock is when working in the range of MHz frequency, there is the significantly Aperture Jitter of more than ps magnitude；And along with the rising of operating frequency, this time jitter exponentially type deteriorates.The real-time response speed which results in current electricity ADC is in 5 below Gb/s more.
Present communications speed has reached 10 Gb/s, it is desirable to the generation of High-Speed True Random Bit that speed is matched real-time, produce online, to guarantee that what information transmitted is perfectly safe.Current real random code produces technology still has suitable distance away from this code check, is not enough to thoroughly ensure being perfectly safe of modern communications.Therefore, high speed, real-time truly random pattern generator that development and current demand match are extremely the most urgent, and it is to limit the main difficulty that the secret communication that is currently perfectly safe realizes.
Summary of the invention
It is an object of the invention to provide a kind of truly random pattern generator of ultrafast real-time optical, in order to solve the real-time code rate deficiency problem generally existed in above-mentioned existing real random code generation technology.
In order to solve the problems referred to above and realize above-mentioned purpose, the measure that the present invention is taked is as follows.
A kind of truly random pattern generator of ultrafast real-time optical, including Mode-locked laser device, laser chaos entropy source, all-optical switch, optical band pass filter, photodetector, tunable source of stable pressure and differential comparator；It is characterized in that: Mode-locked laser device output Gao Zhongyingf, time jitter be in the ultrashort light pulse sequence of fs magnitude, be loaded into the control signal input of all-optical switch, control the break-make of all-optical switch；The detectable signal end input of the continuous chaos optical signals all-optical switch of laser chaos entropy source output simultaneously, under the effect of control signal ultrashort light pulse sequence, all-optical switch completes the down-sampling to chaos optical signal, output repetition rate and ultrashort pulse sequence frequencyfThe light pulse sequence that consistent but peak power chaos rises and falls；After sampling, acquisition chaos light pulse sequence is after optical band pass filter filters unused noise, is converted to corresponding chaos electrical pulse sequence through photodetector, is loaded into the positive terminal of differential comparator；The voltage signal of tunable source of stable pressure output is as comparing the voltage-drop loading negative pole end to differential comparator；When chaos electric pulse crest voltage is more than when comparing voltage, and differential comparator is output as high level ' 1 ' code；Otherwise output low level ' 0 ' code, this is continuously and the random high and low level occurred constitutes real random code sequence the most in real time.
Based on technique scheme, further technical characteristic is as follows.
The Gao Zhongying of described Mode-locked laser device outputf, time jitter is in the ultrashort light pulse sequence of fs magnitudefIt is taken as 10 GHz.
The comparison voltage of described tunable source of stable pressure output is equal to the intermediate value of the crest voltage of chaos electrical pulse sequence.
The repetition rate of the ultrashort light pulse sequence that the code check of described high speed real-time real random code sequence is exported by Mode-locked laser devicefDetermine, equal to 10 Gb/s.
Realize the technical scheme of the truly random pattern generator of a kind of ultrafast real-time optical that the invention described above is provided, produce technology with in first random code compared with, its advantage with have the active effect that
First, do not exist periodically, it is possible to provide an infinite number of real random code, overcome pseudo-noise code generator natural period property and limit.
Second, the real-time code rate of existing real random code generator, up to 10 Gb/s magnitudes, has been turned over some by real-time code rate, greatly meets the needs of current high speed secret communication.
3rd, signal processing no longer needs the participation of electricity clock, has broken the speed of response bottleneck of the electric ADC that electric clock Aperture Jitter causes.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention truly random pattern generator of a kind of ultrafast real-time optical.
In figure: 1: Mode-locked laser device；2: laser chaos entropy source；3: all-optical switch；4: optical band pass filter；5: photodetector；6: tunable source of stable pressure；7: differential comparator.
Fig. 2 is the continuous chaotic signal sequential chart of laser chaos entropy source of the present invention output.
Fig. 3 is the ultrashort pulse sequence timing diagram of Mode-locked laser device of the present invention output.
Fig. 4 is the chaos pulse sequence sequential chart after the sampling of all-optical switch of the present invention output.
Fig. 5 is the ultrafast real-time real random code sequence waveform figure that the present invention produces.
Detailed description of the invention
Below the detailed description of the invention of the present invention is further illustrated.
The present invention above-mentioned the provided one truly random pattern generator of ultrafast real-time optical is provided, it is on the basis of existing technology, utilize Gao Zhongying that mode-locked laser produces, the ultrashort light pulse sequence of ultralow shake (fs magnitude) to replace the electric clock of Aperture Jitter greatly (more than ps magnitude), utilize all-optical switch 3 to complete the ultralow shake sampling to chaos optical signal in the optical domain；Then, utilize electronic differential comparator to replace 1 electronics ADC, as quantizer, it is carried out quantization encoding, it is not necessary to the driving of electricity clock, the real random code sequence with ultrafast real-time code rate can be produced.
In traditional sense or usual manner, the technology path that the technical staff in truly random password field uses is all to utilize photodetector directly continuous print laser chaos signal to be converted to the signal of telecommunication, then utilize electricity clock as triggering or inducement signal, utilize electricity ADC to complete it is sampled in the electrical domain, quantify and all processes such as subsequent treatment.This results in whole signal processing, all need electricity clock participation, the existence of the ps even ns above Aperture Jitter of magnitude seriously limits the speed of response of electronics ADC, causes the current the highest real time rate of real random code generator less than 5Gb/s.
The present invention breaks this area researcher and uses electronics ADC and electricity clock, the most in the electrical domain chaotic signal is carried out all of signal processing (i.e. to sample, quantify and subsequent treatment) thinking inertia and fixed pattern, sampling and quantizing process are peeled away, all-optical switch is used to complete the direct sampling to chaos optical signal in the optical domain, then use electronic differential comparator that it is carried out quantification treatment etc. in electrical domain, without the participation of electricity clock in whole processing procedure, thus effectively overcome electronic clock to shake the electron velocity bottleneck arranged to real random code generation technology.The real-time code rate of existing real random code generator has at least been turned over some by the present invention, does not expects and also could not predict the most significantly effect, is fully able to meet the security needs of Modern High-Speed secret communication, has greatly widened the range of application of random code generator.
The present inventor place seminar since two thousand eight, pays close attention to the latest Progress of real random code generator research direction for a long time.So far, any related researcher not yet it is found to have in view of by all-optical switch and the generation being applied to random pattern without electric clock-driven electronic differential comparator.
The truly random pattern generator of the ultrafast real-time optical of one disclosed in this invention, is to be made up of Mode-locked laser device 1, laser chaos entropy source 2, all-optical switch 3, optical band pass filter 4, photodetector 5, tunable source of stable pressure 6 and differential comparator 7；Mode-locked laser device 1 exports Gao Zhongyingf, time jitter be in the ultrashort light pulse sequence of fs magnitude, be loaded into the control signal input of all-optical switch 3, thus control the break-make of all-optical switch 3；The detectable signal end input of the continuous chaos optical signals all-optical switch 3 of laser chaos entropy source 2 output, under the effect of control signal (ultrashort light pulse sequence), all-optical switch 3 completes the down-sampling to chaos optical signal, output repetition rate and ultrashort pulse sequence frequencyfThe light pulse sequence (chaos light pulse sequence) that consistent but peak power chaos rises and falls；After sampling obtain chaos light pulse sequence after optical band pass filter 4 filters unused noise, be converted to corresponding chaos electrical pulse sequence through photodetector 5, be loaded into differential comparator 7 just (+) end；The voltage signal of tunable source of stable pressure 6 output is as comparing the voltage-drop loading negative (-) end to differential comparator 7；When chaos electric pulse crest voltage is more than when comparing voltage, and differential comparator 7 is output as high level (' 1 ' code), otherwise, output low level (' 0 ' code), these are continuously and the random high and low level occurred constitutes real random code sequence the most in real time.The Gao Zhongying of wherein said Mode-locked laser device 1 outputf, time jitter is in the ultrashort light pulse sequence of fs magnitudefIt is taken as 10 GHz；The comparison voltage of described tunable source of stable pressure 6 output is equal to the intermediate value of the crest voltage of chaos electrical pulse sequence；The repetition rate of the ultrashort light pulse sequence that the code check of described high speed real-time real random code sequence is exported by Mode-locked laser device 1fDetermine, equal to 10 Gb/s.
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is explained in detail.
As shown in Figure 1, the ultrashort light pulse sequence (as shown in Figure 2) that Mode-locked laser device 1 exports repetition rate 10 GHz, wavelength is 1550 nm, enter in all-optical switch 3 as control signal.Meanwhile, the continuous chaos optical signal (as shown in Figure 3) that wavelength is 1560 nm that laser chaos entropy source 2 is launched is inputted by the detectable signal end of all-optical switch 3.Under the effect of control signal (ultrashort light pulse sequence), in the moment of corresponding ultrashort pulse, all-optical switch 3 opens, and the chaotic signal of corresponding time is exportable；Otherwise, when not having moment of ultrashort pulse, all-optical switch 3 is closed, then export without chaotic signal.So, all-optical switch 3 just completes the down-sampling to chaos optical signal, output repetition rate and ultrashort pulse sequence frequencyf=10 GHz consistent but peak power chaos rise and fall light pulse sequence (as shown in Figure 4).
After sampling obtain chaos light pulse sequence after optical band pass filter 4 filters unused noise, be converted to corresponding chaos electrical pulse sequence through photodetector 5, be loaded into differential comparator 7 just (+) end.The voltage signal of tunable source of stable pressure 6 output is as comparing the voltage-drop loading negative (-) end to differential comparator 7.Regulate the comparison voltage swing of tunable source of stable pressure 6, it is allowed to the intermediate value of crest voltage equal to chaos electrical pulse sequence, then: when chaos electric pulse crest voltage is more than when comparing voltage, differential comparator 7 is output as high level (' 1 ' code), otherwise, output low level (' 0 ' code), these are continuously and the random high and low level occurred constitutes the real-time truly random pattern sequence of high speed.Fig. 5 is obtained truly random pattern figure: the repetition rate of the ultrashort light pulse sequence that the code check of this high speed real random code sequence in real time is exported by Mode-locked laser device 1fDetermine completely, equal to 10 Gb/s.
In order to check the random quality of real random code produced by the present invention, the random number sequence generated is tested by the Special Publication 800 22 random number testing standard that inventor uses American National Standard and technical research institute (NIST) to provide.NIST random number testing standard is general international standard, comprises 15 tests altogether, and each test result is usedPValue represents.IfPValue is more than level of signifiance valueαWhen=0.01, then show that surveyed random number sequence has passed through corresponding test.Further, the percent of pass calculating each test verifies validity and the correctness of sequence stochastic behaviour further.When each percent of pass tested is more thanTime, it is believed that surveyed random number has good randomness.Here,p= 1- α。
Specifically, inventor acquires the real random code sequence that 1000 pool-sizes are 1 Mbit respectively and carries out NIST test.At this moment, it is desirable to the percent of pass of each test is more than 0.9806.The test result of inventor shows that the full light true random number under various speed produced by the present invention is respectively provided with high-quality stochastic behaviour, all can successfully pass NIST random number testing standard.Subordinate list 1 gives the worst test result that true random number produced to the present invention carries out NIST test, but every testPValue is still all higher than 0.01, and every test percent of pass is all higher than 0.9806, has reached random number testing standard, it was demonstrated that the real random code randomness that the present invention produces is good.
By discussed above it will be seen that the high speed of the present invention real-time real random code generator is in whole signal transacting, it be not required to electronic clock and the participation of electronics ADC, thus effectively prevent and shaken, by electronic clock, the electronics ADC rate limit problem caused.The present invention uses all-optical switch to utilize the ultrashort light pulse of ultralow shake that chaotic signal carries out in full area of light ultralow shake sampling, utilize, without electric clock-driven differential comparator, Chaotic-Pulse is carried out quantification treatment, produce the real random code sequence of 10 Gb/s magnitudes, the code check of prior art has at least been turned over some.
In addition, it is necessary to it is emphasized that the code check of true random number produced by the present invention is determined by the repetition rate of Mode-locked laser device completely, and keep consistent therewith.Therefore, easily true random number code check can be carried out the tuning on a large scale of 0 ~ 10 real-time Gb/s by controlling this parameter, facilitate the efficient utilization of different size communication network.
Claims (4)
1. the truly random pattern generator of ultrafast real-time optical, including Mode-locked laser device, laser chaos entropy source, all-optical switch, optical band pass filter, photodetector, tunable source of stable pressure and differential comparator；It is characterized in that: Mode-locked laser device (1) output Gao Zhongyingf, time jitter be in the ultrashort light pulse sequence of fs magnitude, be loaded into the control signal input of all-optical switch (3), control the break-make of all-optical switch (3)；The detectable signal end input of continuous chaos optical signals all-optical switch (3) that laser chaos entropy source (2) exports simultaneously, under the effect of control signal ultrashort light pulse sequence, all-optical switch (3) completes the down-sampling to chaos optical signal, output repetition rate and ultrashort pulse sequence frequencyfThe light pulse sequence that consistent but peak power chaos rises and falls；After sampling, acquisition chaos light pulse sequence is after optical band pass filter (4) filters unused noise, is converted to corresponding chaos electrical pulse sequence through photodetector (5), is loaded into the positive terminal of differential comparator (7)；The voltage signal that tunable source of stable pressure (6) exports is as comparing the voltage-drop loading negative pole end to differential comparator (7)；When chaos electric pulse crest voltage is more than when comparing voltage, and differential comparator (7) is output as high level ' 1 ' code；Otherwise output low level ' 0 ' code, this is continuously and the random high and low level occurred constitutes real random code sequence the most in real time.
The truly random pattern generator of ultrafast real-time optical the most as claimed in claim 1, it is characterised in that: the Gao Zhongying that described Mode-locked laser device (1) exportsf, time jitter is in the ultrashort light pulse sequence of fs magnitudefIt is taken as 10 GHz.
The truly random pattern generator of ultrafast real-time optical the most as claimed in claim 1, it is characterised in that: the comparison voltage that described tunable source of stable pressure (6) exports is equal to the intermediate value of the crest voltage of chaos electrical pulse sequence.
4. the truly random pattern generator of ultrafast real-time optical described in claim 1, it is characterised in that: the repetition rate of the ultrashort light pulse sequence that the code check of described high speed real-time real random code sequence is exported by Mode-locked laser device (1)fDetermine, equal to 10 Gb/s.
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