CN104461455A - Ultrafast full-optical true random number generating method - Google Patents
Ultrafast full-optical true random number generating method Download PDFInfo
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- CN104461455A CN104461455A CN201410829731.7A CN201410829731A CN104461455A CN 104461455 A CN104461455 A CN 104461455A CN 201410829731 A CN201410829731 A CN 201410829731A CN 104461455 A CN104461455 A CN 104461455A
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Abstract
The invention provides an ultrafast full-optical true random number generating method. An optical device is utilized for generating ultra-short pulse sequences, spectrum cutting is performed so that narrowband ultra-short pulse sequences can be obtained, then, power adjustment is performed so that the average powers of the paths of sequences can be the same, the sequences are converted into different pulse states, next, equal-difference delay is performed on N paths of parallel true random codes so that equal delay amount exists between every two adjacent paths of true random pulse sequences, and finally the time-division multiplexing is performed on ultrafast full-optical true random number sequences with the code generating rate being N*f. According to the method, high-speed true random numbers are generated through a time-division multiplexing technology, the requirement for entropy source bandwidth is lowered, the speed of the time-division multiplexing technology can reach the Tbps magnitude, the speed of the time-division multiplexing technology is increased by three magnitude orders compared with that of an existing true random number generating technology, and the requirement for modern high-speed secret communication safety is met.
Description
Technical field
The present invention relates to a kind of full light true random-number generating method, belong to areas of information technology, it is a kind of method producing superelevation code check true random number sequence, is mainly used in secret communication and Large-scale parallel computing, is used for producing safe and reliable true random number or key fast.
Background technology
In secret communication field, produce safe and reliable random number (being also called key) fast, be related to numerous aspects such as national defense safety, financial stability, trade secret, individual privacy.
In secret communication, general random number is encrypted as double secret key cleartext information, as long as key is not cracked, just ensure that the safety of transmitted information.Theoretical according to " one-time pad " of Shannon, the secret communication be perfectly safe need meet the following conditions: (1) key length is not shorter than length of the plaintext; (2) key is completely random; (3) key can not be reused.This just requires to produce the true random number that a large amount of code check is not less than traffic rate.
Existing true random-number generating method generally adopts broadband light component as physical entropy source, and the random signal of being launched by photodetector is converted to electric signal, after electronic analogue-to-digital converter quantizes, finally produces generation of High-Speed True Random Bit.Conventional broadband light component comprises: single photon, ASE spontaneous emission noise, vacuum state and chaotic laser light etc.But so far, the flank speed that current true random-number generating method in the world can realize is 4.5 Gbps [Opt. Express, 21 (17): 20452-20462,2013] only---the method is realized by inventor place seminar.Will obtain the true random number of higher rate further, superfast electric ADC need be selected to carry out quantization encoding, and this certainly will face the restriction of " electron velocity bottleneck ".The electric ADC that current responsive bandwidth is the highest surely belongs to the CHAIS ADC of Fujitsu, and its bandwidth can reach 15 GHz, almost close to electronic bandwidth theoretical limit.Also just mean, the true random number generation device utilizing above-mentioned conventional art to build and method thereof, technically attainable most rapid rate can only be in ten Gbps magnitudes.
But Modern high-speed communications has developed into the dense wave division multipurpose stage.The application of dense wavelength division multiplexing system makes current demand signal transfer rate can reach 1 Tbps, is in the true random number generation device of Tbps magnitude, to guarantee being perfectly safe of information transmission in the urgent need to developing the code check matched with it.Current true random number produces technology and still has suitable distance apart from this code check, is far not enough to ensure being perfectly safe of modern communications.
Summary of the invention
Object of the present invention provides a kind of ultrafast full light true random-number generating method, to solve the problems such as ubiquitous code check in above-mentioned prior art is not enough, is suitable for modern secret communication and Large-scale parallel computing.
Above-mentioned purpose is achieved by following technical solution.
A kind of ultrafast full light true random-number generating method, method described in it follows these steps to carry out:
(1) utilize active mode pulsed laser, pulsed light amplifier, high nonlinear dispersion shifted fiber and the abnormal dispersion fiber be connected successively to produce and there is ultra-wide spectrum F, repetition frequency
fthe ultrashort pulse sequence that fixing, peak power significantly rises and falls;
(2) utilize array waveguide grating to carry out spectrum cutting to the ultrashort pulse sequence that step one obtains, thus obtain
nroad is irrelevant, repetition frequency independently
fthe arrowband ultrashort pulse sequence that fixing, peak power significantly rises and falls;
(3) utilize
nindividual light intensity regulating equipment is to producing in step 2
nultrashort pulse sequence in arrowband, road carries out the adjustment on power, and the average power of Shi Mei road sequence is equal;
(4) utilize
nindividual full pumped FIR laser equipment will produce in step 3
nthe peak power of arrowband, road short pulse sequence rises and falls and converts different pulse condition to: peak power is greater than average power, has pulse to export, is encoded to 1; Peak power is lower than average power, and no pulse exports, be encoded to 0.So just achieving repetition frequency is
f's
nroad walks abreast the generation of full light real random code, warp
nindividual light belt pass filter element leaches.
(5) utilize
nduan Yanchi optical fiber is to above-mentioned
nthe road real random code that walks abreast implements equal difference time delay, makes to there is equal-delay amount 1/ between the true random pulse sequence of adjacent two-way
fN, the most laggard time division multiplex forms code check and is
n×
fultrafast full light true random number sequence.
Further additional technical feature is as follows.
The span of described F is 1300 nm ~ 2000nm.
Described
fvalue be 10 GHz.
Described
nvalue be 100.
Realize the ultrafast full light true random-number generating method of above-mentioned the provided one of the present invention, with compared with first true random-number generating method, its advantage and good effect are:
First, the present invention adopts time-division multiplex technology to produce high-speed, true random-number first, and reduce the requirement to entropy source bandwidth, its speed can reach Tbps magnitude, produce the speed height of technology 3 orders of magnitude than existing true random number, meet the security needs of Modern High-Speed secret communication.
The second, do not comprise sampling module in true random-number generating method of the present invention, overcome the additional structure problem that prior art is brought because of distorted signals that sampling process causes.
3rd, the signal processing of true random number generation device of the present invention carries out all in the optical domain, without any need for photoelectric conversion device and electronic die analog/digital converter, breaches the restriction of " electronic bottleneck ".
4th, true random number generation device of the present invention can be directly compatible with optical-fiber network, without the need to any external modulator, overcomes technology limitation when existing randomizer is applied to optical communication network.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the ultrafast full light true random-number generating method of the present invention.
Fig. 2 is the structural representation of full optical quantizer in specific embodiment.
Fig. 3 is the structural representation of the ultrafast full light true random number generation device of the present invention.
In figure: 1: active mode pulsed laser; 2: pulsed light amplifier; 2a:3dB coupling mechanism I; 2b: optoisolator I; 2c: optoisolator II; 2d: coupling mechanism I; 2e: coupling mechanism II; 2
f: wavelength division multiplexer; 2g: high non-linear photon crystal optical fiber; 2h:3dB coupling mechanism II.3: high nonlinear dispersion shifted fiber; 4: abnormal dispersion fiber; 5: array waveguide grating; 6: light attenuator array; 7: full optical comparator array; 8: continuous light laser instrument; 9: optical filter array; 10: optical delay line array; 11:
n× 1 photo-coupler.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further illustrated, but this embodiment should not be construed as limitation of the present invention.
Implement the ultrafast full light true random-number generating method of the above-mentioned one provided of the present invention, method described in it follows these steps to carry out:
The pulsewidth that step one, active mode pulsed laser export is about 1.7ps, repetition frequency
f=10 GHz, wavelength are the ultrashort light pulse sequence of 1550 nm, and after the effect of pulsed light amplifier, its peak power can increase to 2 kW.Enter into segment length 5 m using this ultrashort pulse signal as pumping source through polarization maintaining optical fibre, nonlinear factor is 25/W/km high nonlinear dispersion shifted fiber, zero dispersion point is positioned at 1550 nm places, by the acting in conjunction of the effects such as self aggregation, Self-phase modulation, Cross-phase Modulation, four-wave mixing and stimulated Raman scattering in high nonlinear dispersion shifted fiber, many new frequency contents can be produced in the spectrum of pumping pulse, make the spectrum width of spectral width much larger than incident pulse of output pulse sequence, finally obtain the ultrashort pulse sequence signal that spectrum width can reach 1300 nm.
Due to the existence of noise signal, ultra-wide spectrum F=1300 nm now, repetition frequency
fthe ultrashort pulse sequence peaks intensity of=10 GHz has faint fluctuating, but is far not enough to the requirement meeting subsequent quantizatiion system.In order to strengthen the fluctuating of above-mentioned ultrashort light pulse peak strength further, introduce the abnormal dispersion fiber of segment length 10 m here.Super continuous spectrums light pulse signal is in abnormal dispersion fiber transmitting procedure, and the modulational instability that noise drives will play a leading role, and cause the stability degradation of super continuous spectrums light pulse, peak value of pulse intensity presents strong fluctuating.So just achieve first step of the present invention, obtain and there is ultra-wide spectrum F, repetition frequency
fthe ultrashort pulse sequence (see figure 1) that fixing, peak power significantly rises and falls.Specific to the present embodiment, width about 1 ps, F=1300 nm of pulse in the ultrashort pulse sequence that this peak power significantly rises and falls,
f=10 GHz.
Step 2, channel spacing is utilized to be 10 nm, port number
nthe array waveguide grating on=100 tunnels ultrashort light pulse sequence to above-mentioned repetition frequency 10 GHz, peak strength significantly random fluctuation carries out spectrum cutting, separable go out
nthe arrowband ultrashort pulse sequence on=100 tunnels.The Gao Zhongying of a kind of ultra-wide spectrum ultrashort pulse of step sequence that this sequence is hereditary and peak power significantly fluctuation characteristic, and separate each other.Here particularly point out,
n=100 arrowband, road ultrashort pulse sequences completely independently essential reason each other, to be in step one that ultra-wide spectrum ultrashort pulse sequence random fluctuation originates from quantum independently laser spontaneous emission noise and selected each output channel of array waveguide grating spectrally zero lap in step 2.Which achieves second step (see figure 1) of the present invention.Specific to the present embodiment, what this step produced independently has nothing to do, the repetition frequency on the way N=100 road of arrowband ultrashort pulse sequence, often road
f=10 GHz, pulsewidth are 1.0 ps and peak power significantly random fluctuation.
Step 3, utilization
nthe optical attenuator of individual parallel arranged produces step 2
nindependently the haveing nothing to do of=100 tunnels, the adjustment that ultrashort pulse sequence in arrowband carries out light intensity, make the average power of each pulse train all equal, be denoted as P
th=32mW.
Step 4, to obtain final in step 3
nthe ultrashort pulse sequence on=100 tunnels, as sub-random number extraction source, inputs each self-corresponding
n=100 full optical comparators, are quantified as
nroad is the true random pulse sequence of high speed independently, through each self-corresponding
nindividual optical band pass filter leaches.In the present embodiment,
nindividual full optical comparator is identical device, and the course of work is also identical.Therefore, will randomly draw one of them full optical comparator is below example, right
nthe production process of the true random pulse sequence of road high speed is described in detail.
Accompanying drawing 2 is detailed construction schematic diagram of full optical comparator in the present embodiment, and wherein A, C are input end, B is output terminal.The arrowband ultrashort pulse sequence inputted by A port, as the wavelength division multiplexer 2 of control light I in accompanying drawing 2
fenter loop.The continuous light signal that continuous light laser instrument exports is divided into two-way as detection light by three-dB coupler I 2a, is called upper arm, underarm two-way respectively.Upper arm continuous light signal is divided into two-way through optoisolator I 2b by coupling mechanism I 2d: a road continuous light signal II leads directly to arm onwards transmission by coupling mechanism I 2d, another road continuous light signal III is then entered by the coupling arm of coupling mechanism I 2d in the loop of high non-linear photon crystal optical fiber 2g formation, with control light signal I symport.In transmitting procedure, continuous light signal III phase place is subject to linearly phase shift, Self-phase modulation and and control the impact of the Cross-phase Modulation between light.Continuous light signal III transmits to superpose at coupling mechanism I 2d with signal II afterwards for one week and forms new light field signal IV in loop; In like manner, underarm continuous signal is divided into two-way through optoisolator II 2c by coupling mechanism 2e: a road continuous light signal V is by the straight-through arm onwards transmission of coupling mechanism II 2e, in the loop that another road continuous light signal VI high non-linear photon crystal optical fiber 2g is formed, with the reverse transmission of control light signal I.Now continuous light signal VI and the cross-phase modulation effect controlled between light I can be ignored, and continuous light signal VI phase place is only subject to the impact of linearly phase shift and Self-phase modulation.Continuous light signal VI transmits to superpose at coupling mechanism II 2e with the signal V in straight-through arm afterwards for one week and forms new light field signal VII in loop.Finally, newborn light field signal IV and signal VII interferes at another three-dB coupler II 2h place and is exported by port B.Thus, realize the full light quantization process of the sub-light pulse sequence in arrowband to the input of A port.
Detailed quantitative test is: the difference of the nonlinear effect that upper and lower arm continuous light signal II, III are subject in high non-linear photon crystal optical fiber ring cavity can make to produce phase differential between two ways of optical signals.Continuous light signal III, V and II, VI superpose at photo-coupler I 2d, photo-coupler II 2e and produce new light field IV, the phase place of VII can be expressed as respectively:
Φ iV=
Φ 0+ 6 π
n 2 lP 1/
λ A eff+ 4 π
n 2 lP 0/
λ A effwith
Φ vII=
Φ 0+ 6 π
n 2 lP 1/
λ A eff.Here,
Φ 0with
λlinear phase shift and the wavelength of upper and lower two-arm continuous light signal respectively,
l , n 2and
a effthe effective cross section being then the length of the ring cavity that high non-linear photon crystal optical fiber 2g is formed, nonlinear refractive index and generation nonlinear effect is long-pending.Consider that the coupling coefficient of photo-coupler I 2d and photo-coupler II 2e is
r, effective phase difference Δ when newborn light field IV, VII coupling output
Φ effcan be expressed as:
Δ
Φ eff= arc tan[(1+
r 2)tan(
Φ IV/2)/(1-
r 2)]
－arc tan[(1+
r 2)tan(
Φ VII/2)/( 1-
r 2)]
Thus, when new light field IV, VII interfere output at 3-dB coupling mechanism II 2h place, transmissivity
tto can be expressed as
t=[1-cos (Δ
Φ eff)]/2.The coupling coefficient of choose reasonable photo-coupler 2d, 2e is
r, effective phase difference can be made to also achieve the saltus step of " 0 ", " π ", interfere transmissivity by light path
t=[1-cos (Δ
Φ eff)]/2 formula know, the transmissivity at output port B place will realize the saltus step between 0 and 1: when transmissivity is 0, and no pulse exports, and produce " 0 " code; When transmissivity is " 1 ", have pulse export and export pulse power constant, produce " 1 " code.
In the present embodiment, the length of selected high non-linear photon crystal optical fiber 2g
l, nonlinear refractive index
n 2and the effective cross section that nonlinear effect occurs is amassed
a eff0.2 m, 4.95 × 10 respectively
-19m
2/ W and 10 μm
2, the coupling coefficient of selected photo-coupler 2d, 2e
rbe 0.99.Now, the transmission transfer function of full optical comparator is a square wave function, has precipitous compare threshold P
th=32 mW.When the sub-light pulse peak power in arrowband of A port input is greater than this threshold value, B output terminal has pulse to export, and is encoded to " 1 "; Otherwise B output port no pulse exports, and is encoded to " 0 ".Finally, the true random pulse sequence of these full light is through each self-corresponding
nindividual identical optical band pass filter leaches.In the present embodiment, the centre wavelength of each bandpass filter is consistent with continuous light laser instrument.Here point out, repetition 10 GHz produced after the effect of full optical comparator unit, the true random pulse sequence of full light of pulsewidth 1 ps, this repetition frequency is by the ultrashort pulse sequence repetition frequency in step one
fdetermine.
Step 5: utilize and postpone in fiber array
nduan Yanchi optical fiber carries out equal difference delay to above-mentioned true random pulse sequence.Here point out, each postpones fiber unit and has different delay fiber lengths respectively, differs 1/ between every section
nf=1/ (100 × 10 GHz)=1 ps.That is, the time delay that first paragraph postpones the corresponding optical fiber of optical fiber is 1 ps, and the time delay that second segment postpones optical fiber is 2 ps, and the 3rd section postpones the optical fiber delay time is 3 ps ...By that analogy, N=100 section postpones the time delay of optical fiber is 100 ps.
Above-mentioned
n=100 tunnels, repetition rate are
f=10 GHz, each other delay inequality are that the true random pulse sequence of full light of 1 ps enters
n× 1 optically-coupled
n=100 input ends, time division multiplex defines
nfthe super high speed all-optical real random code of=100 × 10 GHz=1THz rushes sequence, is exported by the output terminal of N × 1 optically-coupled.
Finally, it is important to note that not random two random code sequence carry out the high speed random code of time division multiplex acquisition, are all real random codes.The hypervelocity random code sequence obtained after meeting multiple real random code sequence time division multiplexes of uncorrelated and statistical iteration is mutually only had just to test by random number industry.Obtain Zhe 100 road full light real random code sequence in the present embodiment and can meet uncorrelated and statistical iteration condition mutually, mainly have benefited from step one.Each road random code correspond to the different spectral composition of ultra-wide spectrum pulse, and these spectrum components are not overlapping each other, all originate from the spontaneous emission noise that quantum is probabilistic, and thus they are completely independent, uncorrelated mutually each other.
The direct constituent relation realizing the full light true random number generation device of above-mentioned full light true random-number generating method is as follows:
A kind of ultrafast full light true random number generation device as shown in Figure 3, this device is in a polarization maintaining optical fibre, be disposed with active mode pulsed laser 1, pulsed light amplifier 2, high nonlinear dispersion shifted fiber 3 and abnormal dispersion fiber 4, forms super continuous spectrums entropy source;
The repetition frequency that described super continuous spectrums entropy source exports is
fpulse train produce through array waveguide grating 5 is cut
nthe sub-light pulse sequence in arrowband, road, laggardly enters to regulate in light attenuator array 6, by
nroad optical fiber and continuous light laser instrument 8 export
nroad continuous light signal enters full optical comparator array 7 simultaneously and is quantized into
nthe true random pulse sequence of road high speed, and leached by optical filter array 9, then warp
nroad optical fiber enters optical fiber delay linear array 10 and acts on, and makes to there is equal-delay amount 1/ between the true random pulse sequence of adjacent two-way
fN, finally enter
ntime division multiplex in × 1 photo-coupler 11, forming code check is
n×
fultrafast full light true random number sequence.
In technique scheme, in the pulse train in described super continuous spectrums entropy source
f=10 GHz; Described array waveguide grating 5 be by
nindividual output wavelength passage is formed; Described light attenuator array 6 be by
nindividual optical attenuator is formed side by side; Described full optical comparator array 7 be by
nindividual identical full optical comparator is formed side by side; Described optical filter array 9 be by
nindividual identical optical filter is formed side by side; Described
nvalue be 100.
Claims (4)
1. a ultrafast full light true random-number generating method, method described in it follows these steps to carry out:
(1) utilize active mode pulsed laser, pulsed light amplifier, high nonlinear dispersion shifted fiber and the abnormal dispersion fiber be connected successively to produce and there is ultra-wide spectrum F, repetition frequency
fthe ultrashort pulse sequence that fixing, peak power significantly rises and falls;
(2) utilize array waveguide grating to carry out spectrum cutting to the ultrashort pulse sequence that step one obtains, thus obtain
nroad is irrelevant, repetition frequency independently
fthe arrowband ultrashort pulse sequence that fixing, peak power significantly rises and falls;
(3) utilize
nindividual light intensity regulating equipment is to producing in step 2
nultrashort pulse sequence in arrowband, road carries out the adjustment on power, and the average power of Shi Mei road sequence is equal;
(4) utilize
nindividual full pumped FIR laser equipment will produce in step 3
nthe peak power of arrowband, road short pulse sequence rises and falls and converts different pulse condition to: peak power is greater than average power, has pulse to export, is encoded to 1; Peak power is lower than average power, and no pulse exports, be encoded to 0; So just achieving repetition frequency is
f's
nroad walks abreast the generation of full light real random code, warp
nindividual light belt pass filter element leaches;
(5) utilize
nduan Yanchi optical fiber is to above-mentioned
nthe road real random code that walks abreast implements equal difference time delay, makes to there is equal-delay amount 1/ between the true random pulse sequence of adjacent two-way
fN, the most laggard time division multiplex forms code check and is
n×
fultrafast full light true random number sequence.
2. ultrafast full light true random-number generating method as claimed in claim 1, the span of F described in it is 1300 nm ~ 2000nm.
3. ultrafast full light true random-number generating method as claimed in claim 1, described in it
fvalue be 10 GHz.
4. ultrafast full light true random-number generating method as claimed in claim 1, described in it
nvalue be 100.
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| CN105242479A (en) * | 2015-11-11 | 2016-01-13 | 北方工业大学 | All-optical comparator based on stimulated Raman scattering loss effect |
| CN105955707B (en) * | 2016-04-27 | 2019-01-04 | 太原理工大学 | A kind of over-sampling high speed real-time optical real random number generator |
| CN105930131A (en) * | 2016-04-27 | 2016-09-07 | 太原理工大学 | Ultrafast real-time optical true random pattern generator |
| CN105955707A (en) * | 2016-04-27 | 2016-09-21 | 太原理工大学 | Oversampling high-speed real-time optical true random number generator |
| CN105930131B (en) * | 2016-04-27 | 2019-01-04 | 太原理工大学 | A kind of truly random pattern generator of ultrafast real-time optical |
| CN106712890A (en) * | 2016-12-09 | 2017-05-24 | 电子科技大学 | Transmitting terminal and receiving terminal of secure communication system |
| CN107368284A (en) * | 2017-07-25 | 2017-11-21 | 太原理工大学 | Full light quantum random-number generating method and device are realized using four-wave mixing effect |
| CN107368284B (en) * | 2017-07-25 | 2020-05-15 | 太原理工大学 | Method and device for realizing generation of all-optical quantum random number by using four-wave mixing effect |
| CN109840071A (en) * | 2019-04-01 | 2019-06-04 | 太原理工大学 | A kind of optical microcavity high-speed physical random code generator |
| CN110851111A (en) * | 2019-10-15 | 2020-02-28 | 中国电子科技集团公司第三十研究所 | High-safety source-independent quantum random number generation device and method |
| CN110851111B (en) * | 2019-10-15 | 2022-08-23 | 中国电子科技集团公司第三十研究所 | High-safety source-independent quantum random number generation device and method |
| CN111693143A (en) * | 2020-05-30 | 2020-09-22 | 华南理工大学 | Real-time pulse laser spectrum measurement method and system with large dynamic range |
| CN111693143B (en) * | 2020-05-30 | 2021-09-21 | 华南理工大学 | Real-time pulse laser spectrum measurement method and system with large dynamic range |
| CN111896126A (en) * | 2020-08-03 | 2020-11-06 | 四川九洲电器集团有限责任公司 | Optical path delay coding method and coding system |
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