CN104065421A - Wavelength-hopping chaotic secure communication method and system based on multi-mode lasers - Google Patents
Wavelength-hopping chaotic secure communication method and system based on multi-mode lasers Download PDFInfo
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Abstract
The invention provides a wavelength-hopping chaotic secure communication method and system based on multi-mode lasers and belongs to the field of secure communication. The system comprises a driving end and two two-way-coupled sending/receiving ends. The same external chaotic optical injection signals are provided for the sending/receiving ends through the driving end, so that chaotic synchronization of each mode of the multi-mode lasers of the sending/receiving ends is achieved, information is loaded into chaotic carrier waves of different modes of the lasers of the sending/receiving ends in different time slots, and two-way wavelength-hopping transmission of the information is realized. The method and the system utilize the enhanced information security features of chaotic communication technology and wavelength-hopping technology at the same time, can improve the physical-layer information transmission security, and is applicable to high-security communication services. Meanwhile, as the method and the system achieve multi-wavelength chaotic synchronization based on the multi-mode lasers, and the information secure transmission capacity of the system can be improved.
Description
Technical field
The invention belongs to secure communication field, be specifically related to a kind of wavelength saltus step Development of Chaotic Secure Communication Method and system based on multimode laser.
Background technology
Explosive growth along with network capacity and user, information privacy is more and more subject to people's attention, and < < communication industry " 12 " the planning > > that China promulgates for 2012 clearly classifies information security as one of development priority during " 12 ".In current application and research, people are mainly by carrying out at media access control layer the fail safe that conventional information encrypts to improve communication system, and to the safety research of physical layer the most under attack seldom.Therefore, realize the information privacy transmission of physical layer significant to improving communication system confidentiality.
The chaos light signal that laser produces under the external disturbance conditions such as light feedback, light injection has unique broadband character and confidential nature, and therefore the full optical chaos synchronous communication based on laser becomes a large focus of security photo-communication research field in this year.[the A.Argyris such as A.Argyris, D.Syvrids, L.Larger, V.Annovazzi-Lodi, P.Colet, I.Fischer, J.Garcia-Ojalvo, C.R.Mirasso, L.Pesquera, and K.A.Shore, " Chaos-based communications at high bit rates using commercialfibre-optic links, " Nature, vol.437, no.17, pp.343 – 346, Nov.2005.] successfully in commercial optical-fiber network, having realized transmission range is 120km, transmission rate is greater than the chaotic secret communication of 1Gbit/s, feasibility and the potential application of the Chaotic secret communication technology based on laser have been proved.[the V.Annovazzi-Lodi such as V.Annovazzi-Lodi, G.Aromataris, and M.Benedetti, " Multi-user private transmissionwith chaotic lasers; " IEEE J.Quantum Electron., vol.48, no.8, pp.1095-2001, Aug.2012] a kind of scheme of utilizing chaotic laser light device to realize the secure communication between multi-user proposed.But the laser chaos secret signalling of having reported at present all adopts single-mode laser, communication remains on a wavelength.There is a defect in this: in the situation that transmission rate is lower, the person of stealing secret information may filter out information (linear filtering method attack) from channel with Wavelength matched filter or tuned filter, the person that do not steal secret information also can realize Chaotic Synchronous (attacking with footwork) by the chaos light signal in channel is injected into simultaneously in Wavelength matched laser, thus acquisition of information.
Wavelength saltus step transmission technology, by information being divided into a series of gap information pieces, distributes different wave length to transmit at different time-gap, can strengthen to a certain extent the fail safe of information.At present also rare about the research of wavelength saltus step secure communication.
Summary of the invention
The present invention is directed to the defect that background technology exists, a kind of wavelength saltus step Development of Chaotic Secure Communication Method and system based on multimode laser is provided, the present invention adopts multimode laser to produce multi-wavelength chaos light signal as carrier source, adopt wavelength jump technique that information is transmitted by different wave length chaos light carrier at different time-gap simultaneously, using wavelength saltus step scheme as the additional keys outside chaotic carrier, by chaos encryption and two kinds of technology of wavelength saltus step, can significantly improve the fail safe of information in transmitting procedure, be applicable to security photo-communication field, broadband.
Technical scheme of the present invention is as follows:
A wavelength saltus step Development of Chaotic Secure Communication Method based on multimode laser, comprises the following steps:
Step 1: raw information is split and integrated according to wavelength saltus step scheme, export the actual transmissions information of each wavelength channel;
Step 2: at transmitting terminal, the chaotic carrier signal of n wavelength is separated into n branch road, n >=2, are loaded on the actual transmissions information of each wavelength channel in the chaotic carrier after separation, then the modulated chaotic carrier in n road are multiplexed with to a road signal and transmit;
Step 3: at receiving terminal, the carrier separation of the carrier signal receiving and the generation of local multimode laser is entered to n branch road, and the signal wavelength of each branch road is identical, on each branch road, local chaotic carrier and the carrier signal receiving are converted to the signal of telecommunication, local carrier is carried out to time delay, make local carrier reach and synchronize with reception carrier, decrypt the transmission information on each wavelength;
Step 4: the transmission information on each wavelength decrypting is reverted to raw information according to the wavelength saltus step scheme with raw information contrary.
A wavelength saltus step chaotic secret communication system based on multimode laser, is characterized in that, this system comprises that drive end, two receive/make a start and optical fiber, wherein:
Drive end comprises laser D-MSL and optical coupler OC, and described laser is exocoel multiple die semiconductor laser, for generation of the chaotic carrier signal S that comprises n wavelength
d, n>=2; Described optical coupler is used for chaotic carrier signal S
dbe divided into two equal bundle signals (coupler splitting ratio is 50:50), inject respectively two and receive/make a start;
Each is received/makes a start and comprises multimode laser, sending module, receiver module, message processing module, optical coupler, circulator, optical isolator, and the running parameter of described multimode laser is identical with drive end laser D-MSL, for generation of local chaotic carrier; Message processing module is for sending information pre-treatment and receiving rear recovery; Sending module comprises wavelength division multiplexer, an optical isolator and n optical modulator, is respectively loaded on the n wavelength chaotic carrier of multimode laser output for the information that n road is obtained after message processing module is processed; Receiver module comprises wavelength division multiplexer and n demodulation branch road, utilizes the Chaotic Synchronous of identical wavelength carrier to decrypt transmission information; Optical circulator is for guaranteeing the transmitted in both directions of signal, and on the one hand, the chaotic carrier that local multimode laser is produced transfers to sending module, on the other hand, by the carrier transmission receiving to local multimode laser; The signal of described sending module output is through optical coupler coupled into optical fibres link; The signal of optical fiber link transmission enters receiver module through optical coupler, optical isolator and optical coupler.
Wherein, described sending module comprises wavelength division multiplexer, an optical isolator and n optical modulator, and specific works step is:
1) utilize wavelength division multiplexer that the chaotic carrier of n wavelength of multimode laser output is separated into n branch road;
2), on each branch road, utilize optical modulator that the information obtaining through message processing module is loaded in chaotic carrier;
3) utilize wavelength division multiplexer that the modulated chaotic carrier in n road is multiplexed with to a road signal, then transmit through being coupled into optical fiber link after optical isolator.
Described receiver module comprises wavelength division multiplexer, photoelectric detector, demodulator, electric delay line, low pass filter, and specific works step is:
1) utilize wavelength division multiplexer respectively by the carrier wave receiving with the n of local multimode laser output to the separated n of entering of the chaotic carrier of an identical wavelength branch road;
2) on each branch road, decipher transmission information: first, utilize photoelectric detector that local chaotic carrier and reception carrier are converted to the signal of telecommunication, utilize electric delay line that local carrier is carried out to time delay, make local carrier reach and synchronize with reception carrier; Then, the local carrier input demodulator by after reception carrier and time delay, finally by crossing low pass filter, decrypts the transmission information on this wavelength.
Described message processing module adopts identical time slot to split rule and identical wavelength saltus step scheme sends information processing and reception information is recovered:
Described transmission information process is: transmission information is admitted to message processing module before entering sending module, and first message processing module is split as a series of block of information by transmission information according to time slot size; Then the information distribution of different time-gap is transmitted on different wave length, realized the wavelength saltus step of transmission information; Finally the block of information on Same Wavelength is integrated, as the transmission information of this wavelength.
The process that described reception information is recovered is: decryption information is admitted to message processing module after receiver module output, and first message processing module splits into a series of block of information by the decryption information on each wavelength according to the fractionation rule of the information of transmission; Then according to the wavelength saltus step rule of the information of transmission, reception information being carried out to wavelength redistributes; Finally the information on Same Wavelength is integrated, recovered raw information.
Beneficial effect of the present invention is:
(1) the present invention injects by the outside chaos light from same drive end, can realize at an easy rate two multi-wavelength chaotic carriers of receiving/making a start between multimode laser synchronous;
(2) the present invention makes full use of the physical layer transmission fail safe enhancing characteristic of chaotic signal and wavelength jump technique, by realizing multi-wavelength chaotic synchronization communication, has improved the confidentiality of communication;
(3) two of the present invention receive/make a start multimode laser and adopt bidirectional coupled mode to connect, and bi-directional transmission of information in all patterns of multimode laser has simultaneously improved the secure communication capacity of system greatly, is applicable to high security communication service.
(4) the present invention utilizes a plurality of mode of operations of chaos multimode laser as carrier wave, can improve the parallel transmission ability of system.
(5) the wavelength saltus step of transmission information of the present invention and recovery can be finished dealing with by under line, can be to existing chaotic secret communication system structure generation considerable influence.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of wavelength saltus step chaotic secret communication system based on multimode laser provided by the invention.Wherein, D-MSL is the exocoel multiple die semiconductor laser of drive end, the multimode laser that MSL1 and MSL2 are bidirectional coupled, and MOD is optical modulator, WDM is light wavelength division multiplexing, Fiber is optical fiber, and PD is photoelectric detector, and OC is optical coupler, OI is optical isolator, DL is electric delay line, and LPF is low pass filter, and Data Processing is message processing module.
Fig. 2 a kind of information wavelength saltus step transmission schematic diagram of the present invention.
The information (solid line) from MSL2 end that in Fig. 3 embodiment of the present invention, MSL1 end recovers and corresponding source information (dotted line) thereof.
The information (solid line) from MSL1 end that in Fig. 4 embodiment of the present invention, MSL2 end recovers and corresponding source information (dotted line) thereof.
In Fig. 5 embodiment of the present invention, the person of stealing secret information adopts linear filtering method to attack information (solid line) and corresponding source information (dotted line) thereof that the link from MSL2 to MSL1 is intercepted and captured.
In Fig. 6 embodiment of the present invention, the person of stealing secret information adopts linear filtering method to attack information (solid line) and corresponding source information (dotted line) thereof that the link from MSL1 to MSL2 is intercepted and captured.
In Fig. 7 embodiment of the present invention, the person of stealing secret information adopts with footwork and attacks information (solid line) and the corresponding source information (dotted line) thereof that the link from MSL2 to MSL1 is intercepted and captured.
In Fig. 8 embodiment of the present invention, the person of stealing secret information adopts with footwork and attacks information (solid line) and the corresponding source information (dotted line) thereof that the link from MSL1 to MSL2 is intercepted and captured.
In Fig. 9 embodiment of the present invention, MSL1 is to MSL2, wavelength X
2on link, legitimate correspondence and the bit error rate of illegally stealing secret information are with the variation of information bit rate.
In Figure 10 embodiment of the present invention, MSL2 is to MSL1, wavelength X
3on link, the bit error rate of legitimate correspondence and illegal communication is with the variation of information bit rate.
Embodiment
Below in conjunction with accompanying drawing, the invention is further described.
As described in Figure 1, a kind of wavelength saltus step chaotic secret communication system based on multimode laser that the present invention proposes comprises the exocoel multiple die semiconductor laser D-MSL of drive end, the multimode laser MSL1 of bidirectional coupled and MSL2, optical modulator MOD, light wavelength division multiplexing WDM, optical fiber, photoelectric detector PD, optical coupler OC, optical isolator OI, optical circulator, electric delay line DL, message processing module.
Described message processing module is on the one hand for by raw information M
i1, M
i2..., M
in(n>=2, i=1 represents MSL1 end, i=2 represents MSL2 end) according to wavelength saltus step scheme, split and integrate, export the actual transmissions information m of each wavelength channel
i1(t), m
i2(t) ..., m
in(t); On the other hand, the information m' also receiver module being decrypted
i1(t), m'
i2(t) ..., m'
in(t) according to wavelength saltus step scheme, revert to information M
i1', M
i2' ..., M
in'.
This system drive end is by suitably regulating feedback intensity and the external cavity length of exocoel multiple die semiconductor laser D-MSL to produce driving chaos light S
d, and with optical coupler by S
dbe divided into equal two parts, be injected into respectively MSL1 end and MSL2 end.
MSL1 end: the light signal S of local multimode laser output
1be divided into two parts, a part is transfused to transmitter module TX, and by wavelength division multiplexer, is decomposed into n road wavelength and is respectively λ
1, λ
2..., λ
nlight signal, be respectively used to carry local transmission information m
11(t), m
12(t) ..., m
1n(t); Another part is transfused to receiver module, and through wavelength division multiplexer, is decomposed into n road wavelength and is respectively λ
1, λ
2..., λ
nlight signal, for deciphering the information m' from MSL2
21(t), m'
22(t) ..., m'
2n(t).In reality, also can be first with wavelength division multiplexer by S
1be decomposed into n road wavelength and be respectively λ
1, λ
2..., λ
nlight signal, then each road signal is divided into two parts, send into respectively receiver module and sending module.
MSL2 end: the light signal S of local multimode laser output
2be divided into two parts, a part is transfused to transmitter module TX, and by wavelength division multiplexer, is decomposed into n road wavelength and is respectively λ
1, λ
2..., λ
nlight signal, be respectively used to carry local transmission information m
21(t), m
22(t) ..., m
2n(t); Another part is transfused to receiver module, and through wavelength division multiplexer, is decomposed into n road wavelength and is respectively λ
1, λ
2..., λ
nlight signal, for deciphering the information m' from MSL1
11(t), m'
12(t) ..., m'
1n(t).In reality, also can be first with wavelength division multiplexer by S
2be decomposed into n road wavelength and be respectively λ
1, λ
2..., λ
nlight signal, then each road signal is divided into two parts, send into respectively receiver module and sending module.
In transmitter module, information encryption all adopts chaotic modulation mode, and its mathematical description is
MSL1 end wavelength is λ
jchannel on ciphering process be:
MSL2 end wavelength is λ
jchannel on ciphering process be:
In receiver module, information exchange is crossed the mathematical description that demodulator carries out chaos decode and is
MSL1 end wavelength is λ
jchannel on decrypting process be:
MSL2 end wavelength is λ
jchannel on decrypting process be:
In above-mentioned formula, subscript j=1,2 ..., n represents that respectively wavelength is λ
1, λ
2..., λ
nchannel; P
1jand P (t)
2j(t) represent respectively the output light intensity of laser MSL1 and MSL2,
with
represent respectively the light signal strength after MSL1 end and MSL2 end are encrypted by chaotic modulation; m
1jand m (t)
2j(t) represent respectively the transmission information of MSL1 end and MSL2 end, m'
1jand m' (t)
2j(t) represent respectively the decryption information of MSL1 end and MSL2 end; δ is modulation depth, and for guarantee information can effectively be hidden in chaotic carrier, its value is less than 10% conventionally; LPF represents that the low pass filter that equals information bit rate with cut-off frequency carries out filtering to the later result of demodulation computing, eliminates noise and becomes the impact of grading factors with high frequency carrier.
By D-MSL, MSL1, MSL2, be operated in and take 5 wavelength mode of wavelength centered by 1550nm as embodiment below, the present invention is further described.Concrete system parameter is: the operating bias electric current of D-MSL, MSL1, MSL2 is 39.6mA, and in laser chamber, be 8.5ps two-way time, and corresponding longitudinal mode mode spacing is Δ λ=0.94nm (λ
1=1548.12nm, λ
2=1549.06nm, λ
3=1550nm, λ
4=1550.94nm, λ
5=1551.88nm), the feedback intensity of D-MSL and delay of feedback are respectively 20ns
-1and 5ns, intensity and time delay that D-MSL is injected into MSL1 and MSL2 are respectively 40ns
-1and 3ns.Under this condition, the chaotic signal Complete Synchronization of MSL1 and MSL2 output.The modulation depth of information is δ=0.05.For the enhancing ability of checking the present invention to communication confidentiality, we adopt two kinds of attack patterns to carry out simulated strike to each wavelength channel, and a kind of is linear filtering method attack, and a kind of is that same footwork is attacked.The concrete operations that linear filtering method is attacked are: the person of stealing secret information equals information rate low pass filter with cut-off frequency carries out filtering acquired information to the chaotic carrier coming from link intercepting (containing information), and this is also whether checking information is effectively hidden in method the most frequently used in chaotic carrier; The concrete operations of attacking with footwork are: the person of stealing secret information by the chaos light carrier of intercepting and capturing on channel by after amplifying, be injected into MSL1 and the identical laser MSLA of MSL2 in, realize synchronizeing of MSLA and chaotic carrier, then carry out suc as formula the decrypts information (3) and (4) Suo Shu.
Fig. 3 and Fig. 4 have provided respectively MSL1 end and MSL2 rectifies the often result of deciphering the other side transmission information.In emulation, MSL1 end passes through wavelength X
1, λ
2, λ
3, λ
4, λ
5the bit rate of the information that channel sends is respectively 1Gbit/s, 2Gbit/s, 1Gbit/s, 2Gbit/s, 1Gbit/s, and MSL2 end passes through wavelength X
1, λ
2, λ
3, λ
4, λ
5the bit rate of the information that channel sends is respectively 2Gbit/s, 1Gbit/s, 2Gbit/s, 1Gbit/s, 2Gbit/s.Can find out, the information being hidden in the chaotic carrier of different wave length can decrypt from respective wavelength channel., also can find out, by the information of different bit rates being carried out to wavelength saltus step transmission, the information rate on each wavelength channel is also non-constant meanwhile, and this can hide the bit rate of single information, has also strengthened to a certain extent the confidentiality of information.
Fig. 5 and Fig. 6 have provided respectively the person of stealing secret information and have adopted linear filtering method to attack decoded information to each wavelength channel at MSL1 end and MSL2 end.Simulation parameter is identical with Fig. 4 with Fig. 3, and the filter cut off band width that the person of stealing secret information adopts is 2GHz (equaling the peak transfer rate on channel).Can find out, information can be hidden in chaotic carrier well, and difficult quilt is intercepted and captured.
Fig. 7 and Fig. 8 have provided respectively the person of stealing secret information and with footwork, each wavelength channel have been attacked to decoded information at MSL1 end and the employing of MSL2 end.Simulation parameter is identical with Fig. 4 with Fig. 3, and the inner parameter of the laser MSLA that the person of stealing secret information adopts and D-MSL, MSL1, MSL2 are identical, and amplifying injection intensity is 100ns
-1, this makes the output of MSLA very close with the chaotic carrier of intercepting and capturing, and coefficient correlation is greater than 0.93.Result shows, the person of stealing secret information is also difficult to decode out the information of channel by same footwork.
Fig. 9 and Figure 10 have provided respectively the λ of MSL1 to MSL2
2channel and MSL2 are to the λ of MSL1
3on channel, the bit error rate of the bit error rate of legal decryption information and illegal acquisition of information is with the Changing Pattern of information rate.Because the Chaotic Synchronous performance on each wavelength channel is similar with communication performance, the implementation case has only provided the λ of MSL1 to MSL2
2channel and MSL2 are to the λ of MSL1
3on channel, the bit error rate of the bit error rate of legal decryption information and illegal acquisition of information is with the simulation result of information rate.In emulation, except information rate constantly changes, other parameters are identical with Fig. 4 with Fig. 3.Can find out, in the present invention, the bit error rate of the person's of stealing secret information acquisition of information keeps higher level always, and the bit error rate of legitimate correspondence decryption information is lower, the bit error rate of the person's of stealing secret information acquisition of information is than more than the high 10dB of legitimate correspondence, and this explanation the present invention has significantly strengthened the confidentiality of information.In addition, Multi simulation running result shows, suitably regulates system parameters of the present invention, can make the bit error rate of the information of the person's of stealing secret information intercepting and capturing approach 50%, can realize the safe information transmission that security performance is very high.
In sum, the present invention has following feature: 1) adopt multimode laser to produce multi-wavelength carrier wave, in conjunction with wavelength-division multiplex technique, have the ability of simultaneously carrying out two-way multi-wavelength chaotic synchronization communication, greatly improved power system capacity; 2) make full use of the confidentiality of chaotic signal, information is effectively hidden in chaotic carrier and is transmitted, strengthened the confidentiality of information; 3), in conjunction with wavelength jump technique, can further strengthen Information Security.
Above stated be only the simple embodiment of system of the present invention, should be understood that, do not departing under the prerequisite of the inventive method and physical principle, in implementing, reality can make some changes and polishing (such as adopting other chaos encryption/decryption method, adopt external optical feedback to replace outer light to inject and realize Chaotic Synchronous, and replace multimode chaos semiconductor laser etc. by the multi-wavelength chaotic signal generation system of other form), as long as various variations appended claim limit and the scope of the present invention determined in, all utilize innovation and creation that the present invention conceives all at the row of protection.
Claims (5)
1. the wavelength saltus step Development of Chaotic Secure Communication Method based on multimode laser, comprises the following steps:
Step 1: raw information is split and integrated according to wavelength saltus step scheme, export the actual transmissions information of each wavelength channel;
Step 2: at transmitting terminal, the chaotic carrier signal of n wavelength is separated into n branch road, n >=2, are loaded on the actual transmissions information of each wavelength channel in the chaotic carrier after separation, then the modulated chaotic carrier in n road are multiplexed with to a road signal and transmit;
Step 3: at receiving terminal, the carrier separation of the carrier signal receiving and the generation of local multimode laser is entered to n branch road, and the signal wavelength of each branch road is identical, on each branch road, local chaotic carrier and the carrier signal receiving are converted to the signal of telecommunication, local carrier is carried out to time delay, make local carrier reach and synchronize with reception carrier, decrypt the transmission information on each wavelength;
Step 4: the transmission information on each wavelength decrypting is reverted to raw information according to the wavelength saltus step scheme with raw information contrary.
2. the wavelength saltus step chaotic secret communication system based on multimode laser, is characterized in that, this system comprises that drive end, two receive/make a start and optical fiber, wherein:
Drive end comprises laser D-MSL and optical coupler OC, and described laser is exocoel multiple die semiconductor laser, for generation of the chaotic carrier signal S that comprises n wavelength
d, n>=2; Described optical coupler is used for chaotic carrier signal S
dbe divided into two equal bundle signals (coupler splitting ratio is 50:50), inject respectively two and receive/make a start;
Each is received/makes a start and comprises multimode laser, sending module, receiver module, message processing module, optical coupler, circulator, optical isolator, and the running parameter of described multimode laser is identical with drive end laser D-MSL, for generation of local chaotic carrier; Message processing module is for sending information pre-treatment and receiving rear recovery; Sending module comprises wavelength division multiplexer, an optical isolator and n optical modulator, is respectively loaded on the n wavelength chaotic carrier of multimode laser output for the information that n road is obtained after message processing module is processed; Receiver module comprises wavelength division multiplexer and n demodulation branch road, utilizes the Chaotic Synchronous of identical wavelength carrier to decrypt transmission information; Optical circulator is for guaranteeing the transmitted in both directions of signal, and on the one hand, the chaotic carrier that local multimode laser is produced transfers to sending module, on the other hand, by the carrier transmission receiving to local multimode laser; The signal of described sending module output is through optical coupler coupled into optical fibres link; The signal of optical fiber link transmission enters receiver module through optical coupler, optical isolator and optical coupler.
3. the wavelength saltus step chaotic secret communication system based on multimode laser according to claim 2, is characterized in that, described sending module comprises wavelength division multiplexer, an optical isolator and n optical modulator, and specific works step is:
1) utilize wavelength division multiplexer that the chaotic carrier of n wavelength of multimode laser output is separated into n branch road;
2), on each branch road, utilize optical modulator that the information obtaining through message processing module is loaded in chaotic carrier;
3) utilize wavelength division multiplexer that the modulated chaotic carrier in n road is multiplexed with to a road signal, then transmit through being coupled into optical fiber link after optical isolator.
4. the wavelength saltus step chaotic secret communication system based on multimode laser according to claim 2, is characterized in that, described receiver module comprises wavelength division multiplexer, photoelectric detector, demodulator, electric delay line, low pass filter, and specific works step is:
1) utilize wavelength division multiplexer respectively by the carrier wave receiving with the n of local multimode laser output to the separated n of entering of the chaotic carrier of an identical wavelength branch road;
2) on each branch road, decipher transmission information: first, utilize photoelectric detector that local chaotic carrier and reception carrier are converted to the signal of telecommunication, utilize electric delay line that local carrier is carried out to time delay, make local carrier reach and synchronize with reception carrier; Then, the local carrier input demodulator by after reception carrier and time delay, finally by crossing low pass filter, decrypts the transmission information on this wavelength.
5. the wavelength saltus step chaotic secret communication system based on multimode laser according to claim 2, it is characterized in that, described message processing module adopts identical time slot to split rule and identical wavelength saltus step scheme sends information processing and reception information is recovered:
Described transmission information process is: transmission information is admitted to message processing module before entering sending module, and first message processing module is split as a series of block of information by transmission information according to time slot size; Then the information distribution of different time-gap is transmitted on different wave length, realized the wavelength saltus step of transmission information; Finally the block of information on Same Wavelength is integrated, as the transmission information of this wavelength;
The process that described reception information is recovered is: decryption information is admitted to message processing module after receiver module output, and first message processing module splits into a series of block of information by the decryption information on each wavelength according to the fractionation rule of the information of transmission; Then according to the wavelength saltus step rule of the information of transmission, reception information being carried out to wavelength redistributes; Finally the information on Same Wavelength is integrated, recovered raw information.
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