CN114374503A - Long-distance key distribution system based on chaotic synchronization - Google Patents
Long-distance key distribution system based on chaotic synchronization Download PDFInfo
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- CN114374503A CN114374503A CN202210218423.5A CN202210218423A CN114374503A CN 114374503 A CN114374503 A CN 114374503A CN 202210218423 A CN202210218423 A CN 202210218423A CN 114374503 A CN114374503 A CN 114374503A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
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- 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
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- H04B10/54—Intensity modulation
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- 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
- H04B10/801—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 using optical interconnects, e.g. light coupled isolators, circuit board interconnections
- H04B10/802—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 using optical interconnects, e.g. light coupled isolators, circuit board interconnections for isolation, e.g. using optocouplers
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Abstract
The invention belongs to the technical field of secret optical communication, in particular to a long-distance key distribution system based on chaotic synchronization, which solves the technical problems in the background technology and comprises a one-drive-two communication structure consisting of a driving part and two communication parties or a two-drive-two communication structure consisting of two driving parts and two communication parties which are respectively connected. The invention uses digital optical signal as drive signal, and responds the synchronous state of the laser output signal by the phase regulation of the key-controlled injection light, in the process, the digital signal is used as drive signal for long-distance transmission, and the digital signal is less influenced by noise in the link, thereby improving the synchronous quality, further increasing the key distribution distance, being applicable to longer-distance transmission and improving the long-distance synchronous quality.
Description
Technical Field
The application is a divisional application of a patent application with the application number of 202110508221.X, the application date of the original application is 2021, 05 and 11 months, and the invention of the original application is named as a long-distance key distribution system based on chaotic synchronization.
The invention belongs to the technical field of secret optical communication, and particularly relates to a long-distance key distribution system based on chaotic synchronization.
Background
The security communication is concerned with the country stability, the social security, the privacy protection and so on. In the modern times, secure communication is developing towards large capacity and long distance. Secure communications are largely divided into two categories: the channel is encrypted and the information is encrypted. The security of information encryption relies on the security of the key. The existing secret communication distance is limited by the key distribution distance, so that the secure long-distance key distribution to both legal communication parties is an important research content for realizing long-distance secret communication.
The existing key distribution scheme based on chaotic synchronization is that a legal user uses a synchronized chaotic laser as a related signal source and uses an independent random private key to key a transceiver, and finally a consistent key is extracted by screening chaotic time sequences modulated by the same private key to realize key distribution. In 2016, Port and the like realize mutual coupling synchronous experimentsBack-to-back key distribution (Optics letters41.12 (2016): 2871-. 2012 NTT communication laboratory Yoshimura et al proposes a chaos common-driven synchronous key generation scheme (Physical review letters108.7 (2012): 070602.), the experiment achieves key distribution over a distance of 120 km. However, the key distribution distance is difficult to increase due to the limitation of synchronization quality.
In summary, the conventional key distribution scheme has problems of low security and short distribution distance, and the conventional key distribution scheme usually uses analog signals as a driving source, but the analog signals are easily affected by noise, so it is necessary to invent a key distribution technology which has strong anti-interference capability, is safe and can transmit over a long distance.
Disclosure of Invention
The invention aims to solve the technical problems that the existing key distribution scheme is low in safety or short in distribution distance, and an analog signal is used as a driving source, so that the key distribution scheme is easily influenced by noise, and provides a long-distance key distribution system which is strong in anti-interference capability, safe and capable of transmitting in a long distance and is based on chaotic synchronization.
The first technical means for solving the technical problems of the invention is as follows: a long-distance key distribution system based on chaotic synchronization comprises an A side, a B side and a driving part, wherein the driving part is simultaneously used as a driving source of the A side and the B side to form a 'one-drive-two' structure; the A side and the B side respectively comprise an A side optical attenuator and a B side optical attenuator, and two output ends of the first optical fiber coupler are respectively connected to the A side optical attenuator and the B side optical attenuator; an A-side long-distance optical fiber is arranged between the first optical fiber coupler and the A-side optical attenuator, and a B-side long-distance optical fiber is arranged between the first optical fiber coupler and the B-side optical attenuator; the output end of the A-side optical attenuator is sequentially connected with an A-side phase modulator, a second A-side polarization controller, an A-side 1 x 2 optical fiber coupler and an A-side semiconductor laser, the other input end of the A-side phase modulator, which is not connected with the A-side optical attenuator, is connected with a second A-side arbitrary waveform generator, the A-side phase modulator controls the phase of a digital optical signal through a 01 random sequence sent by the second A-side arbitrary waveform generator, the 01 random sequence of the second A-side arbitrary waveform generator, which is used for controlling the phase of the digital optical signal, is an A-side private key, the other output end of the A-side 1 x 2 optical fiber coupler, which is not connected with the A-side semiconductor laser, is connected with an A-side photoelectric detector, the output end of the A-side photoelectric detector is also sequentially connected with an A-side analog-to-side memory, and the digital optical signal is sent to the A-side semiconductor laser, the A-side semiconductor laser emits chaotic signals, the chaotic signals are converted into electric signals after being processed by the A-side photoelectric detector, the electric signals are converted into binary codes after being processed by the A-side analog-digital converter and stored in the A-side memory, and the output end of the second A-side arbitrary waveform generator is connected with the A-side memory and used for sending the A-side private key to the A-side memory for storage; the output end of the B-side optical attenuator is sequentially connected with a B-side phase modulator, a second B-side polarization controller, a B-side 1 x 2 optical fiber coupler and a B-side semiconductor laser, the other input end of the B-side phase modulator, which is not connected with the B-side optical attenuator, is connected with a second B-side arbitrary waveform generator, the B-side phase modulator sends a 01 random sequence through the second B-side arbitrary waveform generator to key the phase of a digital optical signal, the 01 random sequence of the second B-side arbitrary waveform generator, which is used for controlling the phase of the digital optical signal, is a B-side private key, the other output end of the B-side 1 x 2 optical fiber coupler, which is not connected with the B-side semiconductor laser, is connected with a B-side photoelectric detector, the output end of the B-side photoelectric detector is also sequentially connected with a B-side analog-to-side converter and a B-side memory, and the digital optical signal is sent to the B-side semiconductor laser, the B-party semiconductor laser emits a chaotic signal, the chaotic signal is converted into an electric signal after being processed by the B-party photoelectric detector, the electric signal is converted into a binary code after being processed by the B-party analog-digital converter and is stored in a B-party memory, and the output end of a second B-party arbitrary waveform generator is connected with the B-party memory and used for sending a B-party private key to the B-party memory for storage; a public channel for exchanging the private key of the party A and the private key of the party B is connected between the party A memory and the party B memory, the party A and the party B compare the private key of the own party, namely the random sequence of 01 with the private key of the other party, and corresponding binary codes when the phases are consistent are selected as consistent keys of the party A and the party B A, B.
The A party and the B party are both parties of communication. In order to achieve signal synchronization, the structural composition of the a-side and the B-side and the parameters of each part setting should be consistent, which is well known to those skilled in the art. The digital signal has only two states, 0 and 1, and is represented as 0 below the mean value and 1 above. Even if other interference signals are mixed, the original signal can be reproduced as long as the value of the interference signal does not exceed the threshold range. Even if an error occurs due to the value of the interference signal exceeding the threshold range, the error can be detected and corrected by using a certain coding technique, such as an error correction code technique (ECC/FEC/RS). Therefore, compared with analog signals, the digital signals have better anti-interference capability and small distortion amplitude in the transmission process, and have the potential of long-distance transmission. The invention can improve the quality of chaos synchronization by using the digital signal as the driving signal. The phase of the injected light is keyed to respond to the synchronous state of the output signal of the semiconductor laser by using a private key, and when the private keys of two communication parties are the same, chaotic synchronization can be realized; when the private keys of the two parties are different, the two communication parties are not synchronous. The long-distance optical fiber of the A side is positioned between the first optical fiber coupler and the optical attenuator of the A side, the long-distance optical fiber of the B side is positioned between the first optical fiber coupler and the optical attenuator of the B side, digital optical signals are used as driving signals for long-distance transmission in the process, the influence of noise in a link on the digital signals is low, the synchronization quality is improved, and further the key distribution distance is increased.
Preferably, a second a-side erbium-doped fiber amplifier is further disposed between the a-side optical attenuator and the a-side long-distance optical fiber, and a second B-side erbium-doped fiber amplifier is further disposed between the B-side optical attenuator and the B-side long-distance optical fiber. The arrangement of the second A-side erbium-doped fiber amplifier and the second B-side erbium-doped fiber amplifier can increase the safety of signal transmission.
The second technical means for solving the technical problems of the invention is as follows: comprises an A side, a B side, a first arbitrary waveform generator, a first driving part and a second driving part which are consistent in structure, wherein the first driving part and the second driving part are used as driving sources of the A side and the B side to form a 'two-driving-two' structure, the first driving part and the second driving part both comprise narrow-linewidth lasers which are sequentially connected, the first polarization controller, the first erbium-doped fiber amplifier, the intensity modulator, the isolator and the first fiber coupler, wherein the first fiber coupler comprises an input end and an output end, the two output ends of the first arbitrary waveform generator are respectively connected to the other input end, which is not connected with the first erbium-doped fiber amplifier, of the intensity modulator in the first driving part and the second driving part through long-distance fibers, and digital signals output by the first arbitrary waveform generator are transmitted in a long distance and then modulated onto optical signals emitted by respective narrow-linewidth lasers through the intensity modulator to form digital optical signals; the A side and the B side respectively comprise an A side optical attenuator and a B side optical attenuator, the output ends of a first optical fiber coupler in a first driving part and a second optical fiber coupler in a second driving part are respectively connected with the A side optical attenuator and the B side optical attenuator, the output end of the A side optical attenuator is also sequentially connected with an A side phase modulator, a second A side polarization controller, an A side 1 x 2 optical fiber coupler and an A side semiconductor laser, the other input end of the A side phase modulator, which is not connected with the A side optical attenuator, is connected with a second A side arbitrary waveform generator, the A side phase modulator is used for keying the phase of a digital optical signal through a 01 random sequence sent by the second A side arbitrary waveform generator, the 01 random sequence of the second A side arbitrary waveform generator, which is used for controlling the phase of the digital optical signal, is an A side private key, the other output end of the A side 1 x 2 optical fiber coupler, which is not connected with the A side semiconductor laser, is connected with the A side optical detector, the output end of the A-side photoelectric detector is sequentially connected with an A-side analog-digital converter and an A-side memory, after a digital optical signal is transmitted to the A-side semiconductor laser, the A-side semiconductor laser transmits a chaotic signal, the chaotic signal is processed by the A-side photoelectric detector and then converted into an electric signal, the electric signal is processed by the A-side analog-digital converter and then converted into a binary code to be stored in the A-side memory, the output end of a second A-side arbitrary waveform generator is connected with the A-side memory, and the second A-side arbitrary waveform generator transmits an A-side private key to the A-side memory to be stored; the output end of the B-side optical attenuator is also sequentially connected with a B-side phase modulator, a second B-side polarization controller, a B-side 1 x 2 optical fiber coupler and a B-side semiconductor laser, the other input end of the B-side phase modulator, which is not connected with the B-side optical attenuator, is connected with a second B-side arbitrary waveform generator, the B-side phase modulator controls the phase of a digital optical signal through a 01 random sequence sent by the second B-side arbitrary waveform generator, the 01 random sequence of the second B-side arbitrary waveform generator, which is used for controlling the phase of the digital optical signal, is a B-side private key, the other output end of the B-side 1 x 2 optical fiber coupler, which is not connected with the B-side semiconductor laser, is connected with a B-side photoelectric detector, the output end of the B-side photoelectric detector is also sequentially connected with a B-side analog-to-side converter and a B-side memory, the digital optical signal is sent to the B-side semiconductor laser, the B-party semiconductor laser emits a chaotic signal, the chaotic signal is converted into an electric signal after being processed by a B-party photoelectric detector, the electric signal is converted into a binary code after being processed by a B-party analog-digital converter and is stored in a B-party memory, the output end of a second B-party arbitrary waveform generator is connected with the B-party memory, and the second B-party arbitrary waveform generator sends a B-party private key to the B-party memory for storage; a public channel for exchanging the private key of the party A and the private key of the party B is connected between the party A memory and the party B memory, the party A and the party B compare the private key of the own party, namely the random sequence of 01 with the private key of the other party, and corresponding binary codes when the phases are consistent are selected as consistent keys of the party A and the party B A, B. In the structure, a two-drive-two structure is adopted, driving and response are combined, namely a first driving part and a party A are generally called a communication party A, a second driving part and a party B are generally called a communication party B, a long-distance optical fiber is arranged between an intensity modulator and a first arbitrary waveform generator, in the process, a digital signal is used as a driving signal for long-distance transmission, the driving signal is not transmitted in a public channel, therefore, the safety is higher, the influence of noise in a link on the digital signal is low, the synchronization quality is improved, and further, the key distribution distance is increased. In order to achieve signal synchronization, the structural components of the a-communication party and the B-communication party and the parameters set by the respective parts should be consistent, which is well known to those skilled in the art.
The invention has the beneficial effects that: the digital optical signal is used as a driving signal, the phase regulation of the key-controlled injection light responds to the synchronous state of the output signal of the laser, the digital signal is used as the driving signal for long-distance transmission in the process, the influence of noise in a link on the digital signal is low, the synchronization quality is improved, the key distribution distance is further increased, the key distribution method can be used for longer-distance transmission, and the long-distance synchronization quality is improved.
Drawings
Fig. 1 is a schematic structural diagram of a long-distance key distribution system based on chaotic synchronization according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a long-distance key distribution system based on chaotic synchronization according to embodiment 2 of the present invention.
In the figure: 1-narrow linewidth laser; 2-a first polarization controller; 3-a first erbium-doped fiber amplifier; 4-an intensity modulator; 5-an isolator; 6-a first fiber coupler; 7-a first arbitrary waveform generator; 8a-A square optical attenuator; 9a-A side long-distance optical fiber; 10a-a square phase modulator; 11 a-a second a-party polarization controller; 12a-A square 1X 2 fiber coupler; 13a-a square semiconductor laser; 14 a-a second arbitrary waveform generator at square a; 15a-a square photodetector; a 16a-A square analog-to-digital converter; 17 a-party a memory; 18 a-a second a-party erbium doped fiber amplifier; 8B-B square optical attenuator; 9B-B side long-distance optical fiber; a 10B-B square phase modulator; 11B-a second B-direction polarization controller; 12B-B square 1 x 2 fiber coupler; 13B-B square semiconductor laser; 14B-a second B-party arbitrary waveform generator; 15B-B square photodetector; a 16B-B-square analog-to-digital converter; 17B-party memory; 18B-a second B-side erbium doped fiber amplifier; 19-common channel; 20-long haul optical fiber.
Detailed Description
Referring to fig. 1 and 2, a long-distance key distribution system based on chaotic synchronization according to the present invention is described in detail.
Example 1: a long-distance key distribution system based on chaotic synchronization comprises an A side, a B side and a driving part, wherein the driving part is used as a driving source of the A side and the B side to form a 'one-drive-two' structure at the same time, the driving part comprises a narrow linewidth laser 1, a first polarization controller 2, a first erbium-doped optical fiber amplifier 3, an intensity modulator 4, an isolator 5 and a first optical fiber coupler 6 which are sequentially connected, the first optical fiber coupler 6 comprises an input end and two output ends, the other input end, which is not connected with the first erbium-doped optical fiber amplifier 3, of the intensity modulator 4 is connected with a first arbitrary waveform generator 7, and a digital signal output by the first arbitrary waveform generator 7 is modulated onto an optical signal emitted by the narrow linewidth laser 1 through the intensity modulator 4 to form a digital optical signal; the A side and the B side respectively comprise an A side optical attenuator 8a and a B side optical attenuator 8B, and two output ends of the first optical fiber coupler 6 are respectively connected to the A side optical attenuator 8a and the B side optical attenuator 8B; an A-side long-distance optical fiber 9a is arranged between the first optical fiber coupler 6 and the A-side optical attenuator 8a, and a B-side long-distance optical fiber 9B is arranged between the first optical fiber coupler 6 and the B-side optical attenuator 8B; an output end of the a-side optical attenuator 8a is sequentially connected with an a-side phase modulator 10a, a second a-side polarization controller 11a, an a-side 1 × 2 optical fiber coupler 12a and an a-side semiconductor laser 13a, the other input end of the a-side phase modulator 10a, which is not connected with the a-side optical attenuator 8a, is connected with a second a-side arbitrary waveform generator 14a, the phase of the digital optical signal is keyed by a 01 random sequence sent by the second a-side arbitrary waveform generator 14a by the a-side phase modulator 10a, the 01 random sequence used for controlling the phase of the digital optical signal by the second a-side arbitrary waveform generator 14a is an a-side private key, the other output end of the a-side 1 × 2 optical fiber coupler 12a, which is not connected with the a-side semiconductor laser 13a, is connected with an a-side photodetector 15a, the output end of the a-side photodetector 15a is further sequentially connected with an a-side analog-to digital converter 16a and an a-side memory 17a, after the digital optical signal is emitted to the A-side semiconductor laser 13a, the A-side semiconductor laser 13a emits a chaotic signal, the chaotic signal is converted into an electric signal after being processed by the A-side photoelectric detector 15a, the electric signal is converted into a binary code after being processed by the A-side analog-digital converter 16a and is stored in the A-side memory 17a, and the output end of the second A-side arbitrary waveform generator 14a is connected with the A-side memory 17a to send the A-side private key to the A-side memory 17a for storage; the output end of the B-side optical attenuator 8B is sequentially connected with a B-side phase modulator 10B, a second B-side polarization controller 11B, a B-side 1 x 2 optical fiber coupler 12B and a B-side semiconductor laser 13B, the other input end of the B-side phase modulator 10B, which is not connected with the B-side optical attenuator 8B, is connected with a second B-side arbitrary waveform generator 14B, the B-side phase modulator 10B sends a 01 random sequence through the second B-side arbitrary waveform generator 14B to key the phase of the digital optical signal, the 01 random sequence of the second B-side arbitrary waveform generator 14B, which is used for controlling the phase of the digital optical signal, is a B-side private key, the other output end of the B-side 1 x 2 optical fiber coupler 12B, which is not connected with the B-side semiconductor laser 13B, is connected with a B-side photoelectric detector 15B, the output end of the B-side photoelectric detector 15B is further sequentially connected with a B-side analog-to-digital converter 16B and a B-side memory 17B, after the digital optical signal is transmitted to the B-side semiconductor laser 13B, the B-side semiconductor laser 13B transmits a chaotic signal, the chaotic signal is converted into an electric signal after being processed by the B-side photoelectric detector 15B, the electric signal is converted into a binary code after being processed by the B-side analog-digital converter 16B and is stored in the B-side memory 17B, and the output end of the second B-side arbitrary waveform generator 14B is connected with the B-side memory 17B to transmit a B-side private key to the B-side memory 17B for storage; a public channel 19 for exchanging the private key of the party A and the private key of the party B is connected between the party A memory 17a and the party B memory 17B, the party A and the party B compare the private key of the own party, namely the random sequence of 01 with the private key of the other party, and corresponding binary codes are selected as consistent keys of A, B when the phases are consistent.
The A party and the B party are both parties of communication. In order to achieve signal synchronization, the structural composition of the a-side and the B-side and the parameters of each part setting should be consistent, which is well known to those skilled in the art. The digital signal has only two states, 0 and 1, and is represented as 0 below the mean value and 1 above. Even if other interference signals are mixed, the original signal can be reproduced as long as the value of the interference signal does not exceed the threshold range. Even if errors occur due to the value of the interfering signal exceeding the threshold range, the errors can be detected and corrected by using a certain coding technique, for example, an error correction code technique such as ECC/FEC/RS. Therefore, compared with analog signals, the digital signals have better anti-interference capability and small distortion amplitude in the transmission process, and have the potential of long-distance transmission. The invention can improve the quality of chaos synchronization by using the digital signal as the driving signal. The phase of the injected light is keyed to respond to the synchronous state of the output signal of the semiconductor laser by using a private key, and when the private keys of two communication parties are the same, chaotic synchronization can be realized; when the private keys of the two parties are different, the two communication parties are not synchronous. The A-side long-distance optical fiber 9a is located between the first optical fiber coupler 6 and the A-side optical attenuator 8a, and the B-side long-distance optical fiber 9B is located between the first optical fiber coupler 6 and the B-side optical attenuator 8B, in the process, digital optical signals serve as driving signals to be transmitted in a long distance, influence of noise in a link on the digital signals is low, synchronization quality is improved, and further key distribution distance is increased.
Further, as a specific implementation manner of the long-distance key distribution system based on chaotic synchronization in embodiment 1, a second a-side erbium-doped fiber amplifier 18a is further disposed between the a-side optical attenuator 8a and the a-side long-distance optical fiber 9a, and a second B-side erbium-doped fiber amplifier 18B is further disposed between the B-side optical attenuator 8B and the B-side long-distance optical fiber 9B. The provision of the second a-side erbium-doped fiber amplifier 18a and the second B-side erbium-doped fiber amplifier 18B can increase the safety of signal transmission.
Further, as a specific implementation manner of the long-distance key distribution system based on chaotic synchronization in embodiment 1, the coupling ratios of the first optical fiber coupler 6, the a-side 1 × 2 optical fiber coupler 12a, and the B-side 1 × 2 optical fiber coupler 12B are all 50: 50.
Example 2: a long-distance key distribution system based on chaotic synchronization is disclosed, as shown in FIG. 2, comprising a side A, a side B, a first arbitrary waveform generator 7, and a first driving part and a second driving part which are consistent in structure, wherein the first and second driving parts are divided into a 'second driving structure' formed by the driving sources of the side A and the side B, the first and second driving parts respectively comprise a narrow linewidth laser 1, a first polarization controller 2, a first erbium-doped fiber amplifier 3, an intensity modulator 4, an isolator 5 and a first fiber coupler 6 which are connected in sequence, the first fiber coupler 6 comprises an input end and an output end, two output ends of the first arbitrary waveform generator 7 are respectively connected to the other input end of the intensity modulator 4 in the first and second driving parts, which is not connected with the first erbium-doped fiber amplifier 3, through a long-distance fiber 20, digital signals output by the first arbitrary waveform generator 7 are modulated to respective narrow-line narrow-width laser by the intensity modulator 4 after being transmitted in a long-distance Digital optical signals are formed on optical signals emitted by the line width laser 1; the A side and the B side respectively comprise an A side optical attenuator 8a and a B side optical attenuator 8B, the output ends of the first optical fiber couplers 6 in the first driving part and the second driving part are respectively connected with the A side optical attenuator 8a and the B side optical attenuator 8B, the output end of the A side optical attenuator 8a is also sequentially connected with an A side phase modulator 10a, a second A side polarization controller 11a, an A side 1X 2 optical fiber coupler 12a and an A side semiconductor laser 13a, the other input end of the A side phase modulator 10a which is not connected with the A side optical attenuator 8a is connected with a second A side arbitrary waveform generator 14a, the A side phase modulator 10a keys the phase of the digital optical signal through a 01 random sequence sent by the second A side arbitrary waveform generator 14a, the 01 random sequence of the second A side arbitrary waveform generator 14a for controlling the phase of the digital optical signal is a side private key, the other output end of the A-side 1 x 2 optical fiber coupler 12a, which is not connected with the A-side semiconductor laser 13a, is connected with an A-side photoelectric detector 15a, the output end of the A-side photoelectric detector 15a is also sequentially connected with an A-side analog-to-digital converter 16a and an A-side memory 17a, after a digital optical signal is transmitted to the A-side semiconductor laser 13a, the A-side semiconductor laser 13a transmits a chaotic signal, the chaotic signal is processed by the A-side photoelectric detector 15a and converted into an electric signal, the electric signal is processed by the A-side analog-to-digital converter 16a and converted into a binary code to be stored in the A-side memory 17a, the output end of a second A-side arbitrary waveform generator 14a is connected with the A-side memory 17a, and the second A-side arbitrary waveform generator 14a transmits an A-side private key to the A-side memory 17a to be stored; the output end of the B-side optical attenuator 8B is further connected with a B-side phase modulator 10B, a second B-side polarization controller 11B, a B-side 1 x 2 optical fiber coupler 12B and a B-side semiconductor laser 13B in sequence, the other input end of the B-side phase modulator 10B, which is not connected with the B-side optical attenuator 8B, is connected with a second B-side arbitrary waveform generator 14B, the phase of the digital optical signal is keyed by a 01 random sequence sent by the second B-side arbitrary waveform generator 14B by the B-side phase modulator 10B, the 01 random sequence used for controlling the phase of the digital optical signal by the second B-side arbitrary waveform generator 14B is a B-side private key, the other output end of the B-side 1 x 2 optical fiber coupler 12B, which is not connected with the B-side semiconductor laser 13B, is connected with a B-side photoelectric detector 15B, the output end of the B-side photoelectric detector 15B is further connected with a B-side analog-to-digital converter 16B and a B-side memory 17B in sequence, after the digital optical signal is transmitted to the B-side semiconductor laser 13B, the B-side semiconductor laser 13B transmits a chaotic signal, the chaotic signal is converted into an electric signal after being processed by the B-side photoelectric detector 15B, the electric signal is converted into a binary code after being processed by the B-side analog-digital converter 16B and is stored in the B-side memory 17B, the output end of the second B-side arbitrary waveform generator 14B is connected with the B-side memory 17B, and the second B-side arbitrary waveform generator 14B transmits a B-side private key to the B-side memory 17B for storage; a public channel 19 for exchanging the private key of the party A and the private key of the party B is connected between the party A memory 17a and the party B memory 17B, the party A and the party B compare the private key of the own party, namely the random sequence of 01 with the private key of the other party, and corresponding binary codes are selected as consistent keys of A, B when the phases are consistent. In the structure, a two-drive structure is adopted, the drive and the response are combined, namely, the first drive part and the A party are generally called an A communication party, the second drive part and the B party are generally called a B communication party, the long-distance optical fiber 20 is arranged between the intensity modulator 4 and the first arbitrary waveform generator 7, in the process, the digital signal is used as the drive signal for long-distance transmission, and the drive signal is not transmitted in the public channel 19, so that the safety is higher, the influence of noise in a link on the digital signal is low, the synchronization quality is improved, and the key distribution distance is further increased.
Further, as a specific implementation manner of the long-distance key distribution system based on chaotic synchronization in embodiment 2, the coupling ratios of the first optical fiber coupler 6, the a-side 1 × 2 optical fiber coupler 12a, and the B-side 1 × 2 optical fiber coupler 12B are all 50: 50.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A long-distance key distribution system based on chaotic synchronization is characterized by comprising an A side, a B side, a first arbitrary waveform generator (7), a first driving part and a second driving part which are consistent in structure, wherein the first driving part and the second driving part are used as driving sources of the A side and the B side to form a 'second driving structure', the first driving part and the second driving part respectively comprise a narrow linewidth laser (1), a first polarization controller (2), a first erbium-doped optical fiber amplifier (3), an intensity modulator (4), an isolator (5) and a first optical fiber coupler (6) which are sequentially connected, the first optical fiber coupler (6) comprises an input end and an output end, two output ends of the first arbitrary waveform generator (7) are respectively connected to the other input end, which is not connected with the first erbium-doped optical fiber amplifier (3), of the intensity modulator (4) in the first driving part and the second driving part through a long-distance optical fiber (20), the digital signals output by the first arbitrary waveform generator (7) are transmitted in a long distance and then modulated to optical signals emitted by respective narrow linewidth lasers (1) by the intensity modulator (4) to form digital optical signals; the A side and the B side respectively comprise an A side optical attenuator (8 a) and a B side optical attenuator (8B), the output ends of a first optical fiber coupler (6) in a first driving part and a second driving part are respectively connected with the A side optical attenuator (8 a) and the B side optical attenuator (8B), the output end of the A side optical attenuator (8 a) is further sequentially connected with an A side phase modulator (10 a), a second A side polarization controller (11 a), an A side 1 x 2 optical fiber coupler (12 a) and an A side semiconductor laser (13 a), the other input end of the A side phase modulator (10 a) which is not connected with the A side optical attenuator (8 a) is connected with a second A side arbitrary waveform generator (14 a), the A side phase modulator (10 a) is used for keying the phase of a digital optical signal through a 01 random sequence sent by the second A side arbitrary waveform generator (14 a), and the second A side arbitrary waveform generator (14 a) is used for controlling the phase of the digital optical signal, namely the 01 random sequence For the private key of the A side, the other output end of the 1 multiplied by 2 optical fiber coupler (12 a) of the A side, which is not connected with the semiconductor laser (13 a) of the A side, is connected with a photoelectric detector (15 a) of the A side, the output end of the photoelectric detector (15 a) of the A side is also sequentially connected with an analog-to-digital converter (16 a) of the A side and a memory (17 a) of the A side, after the digital optical signal is transmitted to the semiconductor laser (13 a) of the A side, the A-side semiconductor laser (13 a) emits chaotic signals, the chaotic signals are converted into electric signals after being processed by an A-side photoelectric detector (15 a), the electric signals are converted into binary codes after being processed by an A-side analog-digital converter (16 a) and are stored in an A-side memory (17 a), the output end of the second A-side arbitrary waveform generator (14 a) is connected with the A-side memory (17 a), and the second A-side arbitrary waveform generator (14 a) sends the A-side private key to the A-side memory (17 a) for storage; the output end of the B-side optical attenuator (8B) is also sequentially connected with a B-side phase modulator (10B), a second B-side polarization controller (11B), a B-side 1 x 2 optical fiber coupler (12B) and a B-side semiconductor laser (13B), the other input end of the B-side phase modulator (10B) which is not connected with the B-side optical attenuator (8B) is connected with a second B-side arbitrary waveform generator (14B), the phase of the digital optical signal is keyed by a 01 random sequence sent by the second B-side arbitrary waveform generator (14B) by the B-side phase modulator (10B), the 01 random sequence used for controlling the phase of the digital optical signal of the second B-side arbitrary waveform generator (14B) is a B-side private key, the other output end of the B-side 1 x 2 optical fiber coupler (12B) which is not connected with the B-side semiconductor laser (13B) is connected with a B-side photoelectric detector (15B), the output end of the B-side photoelectric detector (15B) is sequentially connected with a B-side analog-digital converter (16B) and a B-side memory (17B), after a digital optical signal is transmitted to the B-side semiconductor laser (13B), the B-side semiconductor laser (13B) transmits a chaotic signal, the chaotic signal is processed by the B-side photoelectric detector (15B) and converted into an electric signal, the electric signal is processed by the B-side analog-digital converter (16B) and converted into a binary code to be stored in the B-side memory (17B), the output end of a second B-side arbitrary waveform generator (14B) is connected with the B-side memory (17B), and a B-side private key is transmitted to the B-side memory (17B) by the second B-side arbitrary waveform generator (14B) to be stored; a public channel (19) for exchanging the private key of the party A and the private key of the party B is connected between the party A memory (17 a) and the party B memory (17B), the private keys of the parties A and the party B are compared with the private key of the other party, and the corresponding binary codes when the phases are consistent are selected as the consistent keys of the parties A, B.
2. The long-distance key distribution system based on chaotic synchronization according to claim 1, wherein the coupling ratio of the first optical fiber coupler (6), the A-side 1 x 2 optical fiber coupler (12 a) and the B-side 1 x 2 optical fiber coupler (12B) is 50: 50.
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| EP3306464B1 (en) * | 2016-10-09 | 2021-09-29 | Université de Genève | Method and device for quantum random number generation |
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