CN109995439A - A kind of multichannel chaos bidirectional transmission system based on electric light negative-feedback - Google Patents
A kind of multichannel chaos bidirectional transmission system based on electric light negative-feedback Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
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Abstract
A kind of multichannel chaos bidirectional transmission system based on electric light negative-feedback, laser are n, and n is any even number, and photoelectric detector is 3n+1, and electric amplifier is n+1, and image intensifer is 2n, and beam splitter is 3n, and coupler is 2n+2, isolator n+1.Using two lasers as transmitting terminal, receiving end, the chaotic signal of laser is divided into two bundles optical signal by beam splitter, a branch of be transferred to after photoelectric detector becomes electric signal amplification is fed back onto the bias current of laser, another beam is coupled on the bias current of intermediate laser device after image intensifer amplification becomes electric signal by photoelectric detector and electric amplifier again, the chaotic signal that intermediate laser device generates becomes electric signal by photoelectric detector again by image intensifer amplification after coupler, is coupled to and receives laser and send on the bias current of laser.This system has n/2 to transmitting-receiving laser, and the laser at each pair of transmitting-receiving laser wire both ends is both to send and receive information laser.
Description
Technical field
The invention belongs to optical information technology fields, and in particular to a kind of two-way biography of multichannel chaos based on electric light negative-feedback
Defeated system.
Background technique
Chaos has to initial value sensitivity, noise like characteristic, ergodic, is difficult to the characteristics such as long-term forecast, therefore chaos can
For in the every field such as biology, economics and neural network, secret communication.There is similar make an uproar based on chaotic communication system
The good characteristic of the pseudo-random signal of sound, chaos secret communication, image encryption and in terms of suffer from it is wide
Prospect.Multichannel chaos bidirectional transmission system of the application based on electric light negative-feedback is embodied in electro-optical feedback, multichannel passes
Defeated, two-way communication.Have many advantages, such as that safety enhancing, chaotic signal complexity is high, confidentiality is high.
The chaotic communication mode used in the prior art is all much single channel bidirectional communication, and for being coupled based on electric light
Then seldom it is related to the multichannel bidirectional chaotic communication technology of feedback.
Summary of the invention
The multichannel chaos transmitted in both directions based on electric light negative-feedback that in view of the deficiencies of the prior art, the present invention proposes a kind of
System.Two-way communication between laser is not only realized using communication system of the present invention, and there is multichannel, it can be by one
Common laser photoelectric coupling respectively receives and dispatches laser, generates chaos in combination with each laser electro-optical feedback, realizes remote logical
The purpose of letter has the characteristics that at low cost, performance is stable, the bit error rate is low, strong security.
The present invention takes following technical scheme:
A kind of multichannel chaos bidirectional transmission system based on electric light negative-feedback, comprising: the even number including intermediate laser device
A laser, multiple photoelectric detectors, multiple electric amplifiers, multiple beam splitters, multiple couplers and multiple isolators；Even number
Any two first laser device in laser, in second laser one be used as transmitting terminal, it is another to be used as receiving end；
The chaotic signal that transmitting terminal generates is divided into two bundles optical signal by No.1 beam splitter: a branch of to be transferred to the coupling of No.1 partial wave
Device is divided into two paths, and the optical signal launched all the way with intermediate laser device synthesizes all the way through No. two couplers of multiplex, by one
After number photoelectric detector, become electric signal, electric signal feedback after the amplification of No.1 electric amplifier arrives the biased electrical of transmitting terminal
On stream；After the amplification of No.1 image intensifer, No. three multiplex to come with other transmitters are coupled into all the way another path, then according to
It is secondary pass through No. two photoelectric detectors, No. two electric amplifiers after become electric signal, be coupled on the bias current of intermediate laser device.
The chaotic signal that intermediate laser device generates is amplified, by No. two after No.1 isolator, No. four couplers by No. two image intensifers
Coupler synthesizes it all the way with the signal from No.1 partial wave coupler, then becomes electric signal by No.1 photoelectric detector,
Amplify through No.1 electric amplifier, is coupled on the bias current of receiving end and transmitting terminal.
Further, another beam optical signal that No.1 beam splitter separates, through No. two isolators, using No. two beam splitters,
Become two beams, a branch of locally to become electric signal, the photoelectric detector that another beam is sent to receiver end through optical fiber link becomes
Electric signal.
The light beam that heretofore described transmitting terminal, receiving end generate carries out after No. two isolators, No. two beam splitters respectively
Connection, No. two beam splitters are connect with No. three photoelectric detectors.This system has n/2 to transmitting-receiving laser, each pair of transmitting-receiving laser
The laser at device route both ends is both to send and receive information laser.
Further, No. three couplers are equipped between the No.1 image intensifer and No. two photoelectric detectors.
Further, the light beam that the transmitting terminal, receiving end generate carries out after No. two isolators, No. two beam splitters respectively
Connection, specifically:
The first laser device, No. two isolators, No. two beam splitters two, two beam splitter three, two of beam splitter one, two
Beam splitter four, the second laser are sequentially connected；The beam splitter three, two of beam splitter two, two of No. two beam splitters one, two
Number beam splitter four is examined with No. four photoelectricity of photoelectric detector two, three of photoelectric detector one, three of photoelectric detector one, three respectively
Three, No. three photoelectric detectors four of device are surveyed to connect.
Further, in the system, the laser is n, and n is any even number；The photoelectric detector is 3n+1
A, the electric amplifier is that (n+1) is a, and the image intensifer is 2n, and the beam splitter is 3n, and the coupler is 2n+2
A, described is isolator n+1.
Further, the first laser device as receiving end is synchronous with the second laser as transmitting terminal,
But it is asynchronous with intermediate laser device.
Further, in this system, 2i+1 and 2i+2 (i=0,1,2 ... (n-1)/2) laser are mutually synchronized.
Further, the electro-optic delay of the first laser device and second laser was 2.67 nanoseconds.
Further, the threshold current of the even numbers of lasers is 32mA.
Further, the transparent carrier number 1.25 × 10 of laser8。
Further, the splitting ratio of the beam splitter is 1:1；Or, the electric light negative-feedback system of all lasers of selection
Number isNanosecond-1；Or, the central wavelength for the chaos carrier frequency light wave that the laser generates is 1550nm.
Multichannel chaos bidirectional transmission system in the present invention realizes process: first laser device swashs as transmitting terminal, second
When light device is as receiving end, the chaotic signal of laser is divided into two bundles optical signal by beam splitter, a branch of to be transferred to channel-splitting filter, then is divided
Cheng Lu synthesizes all the way with the optical signal from intermediate laser device all the way, through photoelectric detector, becomes electric signal, after amplification, bears
It feeds back on the bias current of laser, after another Shu Fang great, all the way with the photosynthesis from other lasers, then passes through photoelectricity
Detector becomes electric signal, is coupled on the bias current of intermediate laser device, and the chaotic signal that intermediate laser device generates passes through coupling
It is divided into n beam after clutch, wherein two beams pass through image intensifer amplification respectively, then electric signal is become by photoelectric detector, be coupled to
On the bias current of first laser device and second laser.Another beam becomes two-way through isolator and beam splitter, all the way in local
Become electric signal, another way is transferred to receiving end.Conversely, first laser device is as reception using second laser as transmitting terminal
When end, signal is equally transmitted to the laser of receiving end by the process with noted earlier by realization principle.It is detected in receiving end
Synchronous error between two lasers, then the information that other side is transmitted can be restored with local signal progress operation.
The present invention is based on the multichannel chaos bidirectional transmission systems of electric light negative-feedback to provide base for the following chaotic optical communication
Plinth condition, Chaotic Synchronous are the core technology of the system, and are the key factors for determining network performance, in following chaotic secret
There to be huge application potential in high-speed communicating network.The present invention realizes chaotic communication using optical device, has at low cost, property
Can be stable, the bit error rate is low, strong security the features such as.
Detailed description of the invention
Fig. 1 is the multichannel chaos bidirectional transmission system structural schematic diagram based on electric light negative-feedback of embodiment 1.
Fig. 2 two conducts send and receive end laser power synchronous error figure.
Fig. 3 is (n-1)th and n-th of laser power synchronous error (P after information is added in both endsn-1-Pn) figure.
Fig. 4 (a) is the signal graph m that the n-th laser is sent1It (t), (b) is (n-1)th laser decoded signal figure m1(t),
(c) be the (n-1)th laser send signal graph m2It (t), (d) is n-th of laser decoded signal figure m2(t), illustrate that the program is complete
It all can enough decode.
Specific embodiment
Below by specific embodiment the technical scheme of the present invention will be further described explanation so that the technical program is more
Add clear, clear.
Embodiment
The present embodiment is related to a kind of multichannel chaos bidirectional transmission system based on electric light negative-feedback, comprising:
Include the even numbers of lasers including intermediate laser device, multiple photoelectric detectors, multiple electric amplifiers, multiple beam splitting
Device, multiple couplers and multiple isolators；Wherein, any two first laser device in even numbers of lasers, in second laser
One is used as transmitting terminal, another to be used as receiving end；The chaotic signal that transmitting terminal generates is divided into two bundles optical signal by No.1 beam splitter:
A branch of No.1 photoelectric detector that is transferred to becomes electric signal, and electric signal feedback after the amplification of No.1 electric amplifier arrives transmitting terminal
Bias current on；Another beam by No.1 image intensifer amplification after pass sequentially through again No. two photoelectric detectors, No. two it is electrically amplified
Become electric signal after device, is coupled on the bias current of intermediate laser device；The chaotic signal that intermediate laser device generates is by the
After one coupler, amplified by No.1 image intensifer, then electric signal is become by No.1 photoelectric detector, is coupled to receiving end and hair
On the bias current of sending end；The light beam that the transmitting terminal, receiving end generate carries out after No. two isolators, No. two beam splitters respectively
Connection, No. two beam splitters are connect with No. three photoelectric detectors.
Another beam optical signal that No.1 beam splitter separates in the present embodiment, through No. two isolators, using No. two beam splitters,
Become two beams, a branch of locally to become electric signal, the photoelectric detector that another beam is sent to receiver end through optical fiber link becomes
Electric signal.
The light beam that transmitting terminal described in the present embodiment, receiving end generate is laggard through No. two isolators, No. two beam splitters respectively
Row connection, No. two beam splitters are connect with No. three photoelectric detectors.This system has n/2 to transmitting-receiving laser, and each pair of transmitting-receiving swashs
The laser at light device route both ends is both to send and receive information laser.
As shown in Figure 1, using any one in first laser device 2-1 and second laser 2-2 as transmitting terminal, another
As receiving end.
Described works as first laser device 2-1 as transmitting terminal, when second laser 2-2 is as receiving end, first laser device
2-1 is connect with No.1 beam splitter 3-1, and one of port of No.1 beam splitter 3-1 and No.1 partial wave coupler 7- (n+1) are even
Connect, No.1 coupler 7- (n+1) is connect with No. two multiplex coupler 7-1, No.1 partial wave coupler another port 7- (n+1) with
No.1 image intensifer 6- (n+1) connection, No.1 image intensifer 6- (n+1) are connect with No. three multiplex coupler 7- (2n+2), and No. three
The output port of multiplex coupler 7- (2n+2) is connect with No. two photoelectric detector 4- (3n+1), No. two photoelectric detector 4- (3n+
1) it is connect with intermediate laser device 1.The second port of No.1 beam splitter 3-1 is connect with No. two isolator 8-1, No. two isolator 8-1
It being connect with No. two beam splitter 3- (n+1), No. two beam splitter 3- (n+1) a ports are connected to No. three photoelectric detector 4- (n+1),
Become electric signal, No. two another port of beam splitter 3- (n+1) are connected to No. two beam splitter 3- (n+2), No. two beam splitter 3- (n+
2) No. two beam splitter 3- (n+4) are connected to by optical fiber link, No. two beam splitter 3- (n+4) are connected to No. three photoelectric detector 4-
(n+4), become electric signal.
Conversely, described is used as transmitting terminal as second laser (2-2), it is former when first laser device (2-1) is as receiving end
Reason is as hereinbefore.Second laser 2-2 is connect with No.1 beam splitter 3-2, one of port and one of No.1 beam splitter 3-2
Number partial wave coupler 7- (n+2) connection, No.1 coupler 7- (n+2) are connect with No. two multiplex coupler 7-2, the coupling of No.1 partial wave
Another port device 7- (n+2) is connect with No.1 image intensifer 6- (n+2), No.1 image intensifer 6- (n+2) and No. three multiplex couplings
Clutch 7- (2n+2) connection, the output port of No. three multiplex coupler 7- (2n+2) and No. two photoelectric detector 4- (3n+1) are even
It connects, No. two photoelectric detector 4- (3n+1) connect with intermediate laser device 1.
The intermediate laser device 1 is consecutively connected to No.1 isolator 8- (n+1), No. four coupler 7- (2n+1) connections,
It is connected respectively to No. two image intensifer 6-1,6-2 again, No. two image intensifer 6-1 are connect with No. two multiplex coupler 7-1, and are come from
No.1 partial wave coupler 7- (n+1) optical signal synthesizes all the way, is connected to No.1 photoelectric detector 4-1, No.1 photoelectric detector 4-1
It is connect with No.1 electric amplifier 5-1, by electric signal feedback to first laser device 2-1.No. two image intensifer 6-2 and No. two multiplex couplings
Clutch 7-2 connection synthesizes all the way with from No.1 partial wave coupler 7- (n+2) optical signal, is connected to No.1 photoelectric detector 4-
2, No.1 photoelectric detector 4-2 is connect with No.1 electric amplifier 5-2, by electric signal feedback to second laser 2-2.
The second port of the No.1 beam splitter 3-1 is connect with No. two isolator 8-1, No. two isolator 8-1 and No. two
Beam splitter 3- (n+1) connection, No. two beam splitter 3- (n+1) a ports are connected to No. three photoelectric detector 4- (n+1), become electricity
Signal, No. two another port of beam splitter 3- (n+1) are connected to No. two beam splitter 3- (n+2), and No. two beam splitter 3- (n+2) pass through
Optical fiber link is connected to No. two beam splitter 3- (n+4), and No. two beam splitter 3- (n+4) are connected to No. three photoelectric detector 4- (n+4),
Become electric signal.
In a kind of way of example, second laser 2-2 is as transmitting terminal, when first laser device 2-1 is as receiving end,
The light beam of two first laser device 2-1 and second laser 2-2 passes through No. two isolator 8-1 and No. two isolator 8-2 respectively, solution
First laser device (the 2- that the process of code is detected after No. two beam splitter 3- (n+1) act on by No. three photoelectric detector 4- (n+1)
1) Output optical power and No. three photoelectric detector 4- (n+2) detect second laser after No. two beam splitter 4- (n+2) act on
The Output optical power of device 2-2 obtains power error by subtracter, and carries out calculus of differences with local signal m1 (t), can solve
The bit m2 (t) of close transmitting terminal transmission.
First laser device 2-1 is as transmitting terminal, and when second laser 2-2 is as receiving end, two-laser light beam passes through respectively
No. two isolators (8-1) and the second isolator 8-1 are crossed, decoded process is after No. two beam splitter 3- (n+3) act on by No. three light
The Output optical power for the first laser device (2-1) that photodetector 4- (n+3) is detected and after No. two beam splitter 3- (n+4) act on
No. three photoelectric detector 4- (n+4) detect the Output optical power of second laser 2-2, obtain power error by subtracter,
And calculus of differences is carried out with local signal m2 (t), the bit m1 (t) of transmitting terminal transmission can be decrypted.So far the system realizes
Two-way communication between the laser of both ends.
Two are illustrated in figure 2 respectively as the laser power synchronous error figure for sending and receiving end, error is said for 0
Bright: it is synchronous for transmitting two lasers of signal.
First laser device 2-1 and the electro-optic delay of second laser 2-2 are equal in this implementation as a preferred implementation manner,
For 2.67 nanoseconds.
The threshold current of even numbers of lasers described in this implementation is 32mA as a preferred implementation manner,.
The transparent carrier number 1.25 × 10 of laser as a preferred implementation manner, in the present embodiment8。
The splitting ratio of the beam splitter in the present embodiment is 1:1 as a preferred implementation manner,.
Select as a preferred implementation manner, the electric light degeneration factor of all lasers forNanosecond-1。
The central wavelength of intermediate laser device chaos carrier frequency light wave is in the present embodiment as a preferred implementation manner,
1550nm。
It is and above-mentioned for any two laser 2i+1 and 2i+2 (i=0,1,2 ... (n-1)/2) two-way communication embodiment
2-1,2-2 process all fours.
With first laser device 2-1, second laser 2-2 to demarcate in figure, remaining laser of the two laser two sides
Function realization principle it is corresponding with this 2 lasers, respectively as transmitting terminal or receiving end.
Using one of laser as transmitting terminal, the chaotic signal of laser is divided into two bundles optical signal by beam splitter,
Electric light coupling and feedback are participated in all the way, participate in communication all the way.Using another laser as when transmitting terminal, equally chaotic signal is divided
For two-beam signal, electric light coupling and feedback are participated in all the way, participates in communication all the way.In the program, have n/2 to transmitting-receiving laser,
The laser at each pair of transmitting-receiving laser wire both ends is both to send and receive information laser.Modulates information is to two lasers
Bias current on, be then hidden in chaos carrier frequency, two lasers are all sent when being " 0 " or " 1 ", and two lasers are same
Otherwise step is in asynchronous mode.Decoded process is transported from the power error for detecting both ends laser, then with local signal
It calculates, the bit of transmitting terminal transmission can be decrypted, realize the two-way communication between two-laser.
The laser at route both ends is both to send and receive information laser, biasing of the modulates information to two lasers
On electric current, then it is hidden in chaos carrier frequency, two lasers are all sent when being " 0 " or " 1 ", two Laser synchronisations, otherwise,
In asynchronous mode.Decoded process carries out operation from the power error for detecting both ends laser, then with local signal, can solve
The bit of close transmitting terminal transmission, realizes the two-way communication between two-laser.Brief summary is as follows:
1, laser realizes Chaotic Synchronous by the coupling of intermediate laser device and itself feedback.
2, when two lasers emit unlike signal, there are synchronous errors.
3, restore the signal of transmitting terminal transmission compared with local signal according to synchronous error.
4, two, each channel transmitting-receiving laser can intercourse information in scheme.
The present invention utilizes chaos principle, and the optical power difference monitored and local signal are compared operation when decoding,
The information to be transmitted can be restored, which increase the confidentiality of system, if signal is trapped on the way in transmission, because not having
Clue knows the information that either party sends, and the transmitting terminal bit information to be transmitted also can not just be successfully decoded out.
The present invention realizes chaotic communication using optical device, has that at low cost, performance is stable, the bit error rate is low, strong security etc.
Feature.
The above are the preferred embodiment of the present invention, and the scope of protection of the present invention is not limited, it should be understood that for
Those skilled in the art's mentality of designing according to the present invention, can be designed that a lot of other modification and implementations, these are repaired
Changing will fall within scope and spirit disclosed in the present application with embodiment, all should be considered as protection scope of the present invention it
It is interior.
Claims (10)
1. a kind of multichannel chaos bidirectional transmission system based on electric light negative-feedback, which is characterized in that exist including intermediate laser device
Interior even numbers of lasers, multiple photoelectric detectors, multiple electric amplifiers, multiple beam splitters, multiple couplers and multiple isolation
Device；Any two first laser device in even numbers of lasers, in second laser one be used as transmitting terminal, it is another as receiving
End；
The chaotic signal that transmitting terminal generates is divided into two bundles optical signal by No.1 beam splitter: a branch of to be transferred to the change of No.1 photoelectric detector
At electric signal, the electric signal is after the amplification of No.1 electric amplifier in feedback to the bias current of transmitting terminal；Another beam passes through one
After passing sequentially through No. two photoelectric detectors, No. two electric amplifiers again after the amplification of number image intensifer become electric signal, is coupled to
Between laser bias current on；The chaotic signal that intermediate laser device generates is after the first coupler, by No. three image intensifers
Amplification, then become electric signal by No. three photoelectric detectors, it is coupled on the bias current of receiving end and transmitting terminal；
The light beam that the transmitting terminal, receiving end generate is attached after No.1 isolator, No. two beam splitters respectively, and described No. two
Beam splitter is connect with No. four photoelectric detectors.
2. a kind of multichannel chaos bidirectional transmission system based on electric light negative-feedback as described in claim 1, which is characterized in that
No. three electric amplifiers are additionally provided between No. three electric amplifiers and the receiving end or transmitting terminal；
Or, being equipped with No. two couplers between the No.1 image intensifer and No. two photoelectric detectors；
Or, being equipped with No. three couplers between the No.1 beam splitter and the No.1 image intensifer.
3. a kind of multichannel chaos bidirectional transmission system based on electric light negative-feedback as described in claim 1, which is characterized in that
The light beam that the transmitting terminal, receiving end generate is attached after No.1 isolator, No. two beam splitters respectively, specifically:
The first laser device, No.1 isolator, No. two three, No. two beam splitting of beam splitter of beam splitter two, two of beam splitter one, two
Device four, the second laser are sequentially connected；Beam splitter three, two of the beam splitter two, two of No. two beam splitters one, two
Beam device four respectively with No. four three, No. four photoelectric detectors of photoelectric detector of photoelectric detector two, four of photoelectric detector one, four
Four connections.
4. claim 1 or or a kind of multichannel chaos bidirectional transmission system based on electric light negative-feedback as described in 2 or 3,
It is characterized in that, the laser is n, and n is any even number；The photoelectric detector is 3n+1, and the electric amplifier is (n+
1) a, the image intensifer is 2n, and the beam splitter is 3n, and the coupler is 2n+2, and described is isolator n+1
It is a.
5. a kind of multichannel chaos bidirectional transmission system based on electric light negative-feedback as described in claims 1 or 2 or 3, special
Sign is that the first laser device as receiving end is synchronous with the second laser as transmitting terminal, but swashs with centre
Light device is asynchronous.
6. a kind of multichannel chaos bidirectional transmission system based on electric light negative-feedback as described in claims 1 or 2 or 3, special
Sign is that the even numbers of lasers is mutually synchronized.
7. a kind of multichannel chaos bidirectional transmission system based on electric light negative-feedback as described in claims 1 or 2 or 3, special
Sign is that the electro-optic delay of the first laser device and second laser was 2.67 nanoseconds.
8. a kind of multichannel chaos bidirectional transmission system based on electric light negative-feedback as described in claims 1 or 2 or 3, special
Sign is that the threshold current of all lasers is 32mA.
9. a kind of multichannel chaos bidirectional transmission system based on electric light negative-feedback as described in claims 1 or 2 or 3, special
Sign is, all transparent carrier numbers 1.25 × 10 of laser8。
10. a kind of multichannel chaos bidirectional transmission system based on electric light negative-feedback as described in claims 1 or 2 or 3, special
Sign is that the splitting ratio of the beam splitter is 1:1；Or, the electric light degeneration factor for selecting all lasers forOr, the central wavelength for the chaos carrier frequency light wave that all lasers generate is 1550nm.
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