CN115396094A - Hardware secret optical fiber communication system based on dispersion-cascade feedback encryption - Google Patents

Hardware secret optical fiber communication system based on dispersion-cascade feedback encryption Download PDF

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Publication number
CN115396094A
CN115396094A CN202211035273.0A CN202211035273A CN115396094A CN 115396094 A CN115396094 A CN 115396094A CN 202211035273 A CN202211035273 A CN 202211035273A CN 115396094 A CN115396094 A CN 115396094A
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signal
output end
input end
module
dispersion
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Inventor
高震森
张丽红
罗颖
唐斌
付松年
王云才
秦玉文
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Guangdong University of Technology
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Guangdong University of Technology
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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
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0861—Generation of secret information including derivation or calculation of cryptographic keys or passwords
    • H04L9/0863—Generation of secret information including derivation or calculation of cryptographic keys or passwords involving passwords or one-time passwords
    • 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
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
    • 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
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/088—Usage controlling of secret information, e.g. techniques for restricting cryptographic keys to pre-authorized uses, different access levels, validity of crypto-period, different key- or password length, or different strong and weak cryptographic algorithms

Abstract

The invention discloses a hardware secret optical fiber communication system based on dispersion-cascade feedback encryption, which relates to the technical field of optical fiber communication and comprises a signal generation module, a signal encryption module, an optical fiber transmission module, a signal decryption module and a signal receiving module; the output end of the signal generation module is connected with the input end of the signal encryption module, the output end of the signal encryption module is connected with the input end of the optical fiber transmission module, the output end of the optical fiber transmission module is connected with the input end of the signal decryption module, and the output end of the signal decryption module is connected with the input end of the signal receiving module; the signal encryption module encrypts the original signal for multiple times based on the dispersion-cascade feedback structure, thereby greatly enhancing the confidentiality and the safety of the system in the encryption process; meanwhile, the signal decryption module is symmetrical to the signal encryption module in structure at first, and is used for decrypting multiple encryptions, so that the confidentiality and the safety of the system are enhanced in the decryption process.

Description

Hardware secret optical fiber communication system based on dispersion-cascade feedback encryption
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to a hardware secret optical fiber communication system based on dispersion-cascade feedback encryption.
Background
Optical fiber communication has the advantages of low loss, large transmission capacity and strong anti-electromagnetic interference capability, however, optical fiber communication also exposes potential security problems while providing high-quality and high-efficiency communication, and how to provide large-capacity and high-speed optical communication under the premise of ensuring security becomes the focus of attention of many researchers. Currently, researchers propose various optical network encryption technologies, which are roughly classified into software-based encryption systems, hardware-based encryption systems, and software-and-hardware-based encryption systems. The hardware-based encryption system mainly comprises a quantum encryption system, a chaotic encryption system, an optical pulse broadening encryption system and the like. By these techniques, the security and confidentiality of data can be effectively improved. Quantum cryptography can theoretically provide unlimited security, but suffers from higher cost and incompatibility with conventional optical communication systems. The chaos encryption system is a mainstream technology based on hardware optical network encryption at present, a broadband chaos signal is used for encrypting an optical modulation signal, the encryption mode is divided into chaos modulation and chaos hiding, chaos synchronous with a transmitting end is generated on the basis of the same hardware structure and parameters at a receiving end for decryption, but the chaos signal is sensitive to noise and optical fiber damage, and long-distance chaos synchronization still remains a difficult problem which needs to be overcome at present stage research. The optical pulse spreading encryption system performs encryption by spreading an optical pulse signal to hide system noise, has the advantages of strong anti-interference capability, large transmission capacity and the like, and needs high-speed key distribution to support the security of the system. Therefore, the hardware encryption technology with higher efficiency and reliability is explored, so that the hardware encryption technology can not only realize large-capacity and long-distance transmission, but also further ensure reliable transmission and be compatible with the existing optical network system, and has important practical significance.
Chinese patent application CN109462479A published in 2019, 3, 12, provides a secure optical fiber communication system. In the system, a signal output end of a signal sending end is connected with a signal input end of a sending end encryption module; the signal output end of the sending end encryption module is connected with the signal input end of the receiving end decryption module through an optical fiber link; the signal output end of the receiving end decryption module is connected with the signal receiving end; the signal output end of the initial chaotic laser generating device is respectively connected with the signal input ends of the transmitting end chaotic laser generating device and the receiving end chaotic laser generating device; the signal output end of the transmitting end chaotic laser generating device is connected with the control signal input end of the transmitting end encryption module through a transmitting end photoelectric detector; the signal output end of the receiving end chaotic laser generating device is connected with the control signal input end of the receiving end decryption module through the receiving end photoelectric detector. The invention is based on chaotic encryption, and is decrypted by generating chaos synchronous with a transmitting end at a receiving end, but chaotic signals are sensitive to noise and optical fiber damage, and the confidentiality and the safety of a system can not be ensured during long-distance chaotic synchronization.
Disclosure of Invention
The invention provides a hardware secret optical fiber communication system based on dispersion-cascade feedback encryption, aiming at overcoming the defect of low confidentiality when the existing optical fiber communication system transmits signals at a large capacity and a long distance, and enhancing the confidentiality and the safety of the system while realizing high-efficiency transmission at the large capacity and the long distance.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the invention provides a hardware secret optical fiber communication system based on dispersion-cascade feedback encryption, which comprises a signal generation module, a signal encryption module, an optical fiber transmission module, a signal decryption module and a signal receiving module, wherein the signal generation module is used for generating a signal;
the output end of the signal generation module is connected with the input end of the signal encryption module, the output end of the signal encryption module is connected with the input end of the optical fiber transmission module, the output end of the optical fiber transmission module is connected with the input end of the signal decryption module, and the output end of the signal decryption module is connected with the input end of the signal receiving module;
the signal generation module generates an original signal and sends the original signal to the signal encryption module; the signal encryption module is provided with a dispersion-cascade feedback structure and is used for encrypting the original signal for multiple times to obtain an encrypted signal; the encrypted signal is sent to the signal decryption module through the optical fiber transmission module, the structure of the signal decryption module is symmetrical to that of the signal encryption module, the encrypted signal is decrypted for multiple times, and the decrypted signal is sent to the signal receiving module; the signal receiving module restores the decrypted signal to the original signal.
Preferably, the signal generation module comprises a laser, an electro-optic modulator and a waveform generator;
the output end of the laser is connected with the first input end of the electro-optical modulator, the output end of the waveform generator is connected with the second input end of the electro-optical modulator, and the output end of the electro-optical modulator is connected with the input end of the signal encryption module;
the laser output by the laser is input into the electro-optical modulator as an optical carrier, the waveform generator generates a high-order electrical modulation signal and inputs the high-order electrical modulation signal into the electro-optical modulator as a driving signal, and the electro-optical modulator modulates the high-order electrical modulation signal onto the optical carrier to form an original signal.
Preferably, the signal encryption module comprises a first dispersion component, a first phase modulator, a second phase modulator, a first optical coupler, a first adjustable optical fiber delay line, a first adjustable optical attenuator, a first photodetector, a first radio frequency amplifier and a second radio frequency amplifier;
the input end of the first dispersion part is connected with the output end of the electro-optic modulator, the output end of the first dispersion part is connected with the input end of the first phase modulator, the output end of the first phase modulator is connected with the input end of the second phase modulator, the output end of the second phase modulator is connected with the input end of the first optical coupler, the first output end of the first optical coupler is connected with the input end of the first adjustable optical fiber delay line, the output end of the first adjustable optical fiber delay line is connected with the input end of the first adjustable optical attenuator, the output end of the first adjustable optical attenuator is connected with the input end of the first photoelectric detector, the first output end of the first photoelectric detector is connected with the input end of the first radio-frequency amplifier, and the output end of the first radio-frequency amplifier is connected with the radio-frequency driving end of the first phase modulator; the second output end of the first photoelectric detector is connected with the input end of a second radio frequency amplifier, and the output end of the second radio frequency amplifier is connected with the radio frequency driving end of a second phase modulator; the second output end of the first optical coupler is connected with the input end of the optical fiber transmission module;
the original signal passes through a first dispersion part to broaden the pulse to achieve intensity distortion; the first optical coupler divides an original signal into two paths, and one path of the original signal is delayed and attenuated by a first adjustable optical fiber delay line and a first adjustable optical attenuator; then the electric signals are converted into electric signals through a first photoelectric detector, the radio frequency output power is amplified through a first radio frequency amplifier and a second radio frequency amplifier respectively, and a first phase modulator and a second phase modulator are driven to modulate the phase; the intensity and the phase of the original signal are encrypted by setting parameters of the first dispersion component, the first phase modulator, the second phase modulator, the first adjustable optical fiber delay line and the first adjustable optical attenuator, and finally the encrypted signal is output by the second output end of the first optical coupler.
Preferably, the optical fiber transmission module comprises a single mode optical fiber, a dispersion compensation optical fiber and an erbium-doped fiber amplifier;
the input end of the single-mode optical fiber is connected with the second output end of the first optical coupler, the output end of the single-mode optical fiber is connected with the input end of the dispersion compensation optical fiber, the output end of the dispersion compensation optical fiber is connected with the input end of the erbium-doped optical fiber amplifier, and the output end of the erbium-doped optical fiber amplifier is connected with the input end of the signal decryption module;
the encrypted signal is transmitted to a dispersion compensation optical fiber to compensate dispersion through a single mode optical fiber, and is transmitted to a decryption module after being amplified by an erbium-doped optical fiber amplifier; the mode dispersion of the single-mode optical fiber is small, so that optical signals can be transmitted for a long distance in a wide frequency band, and long-distance transmission is realized; the dispersion compensation optical fiber has large negative dispersion, an optical signal output from the single-mode optical fiber has positive dispersion and positive dispersion slope, and after the dispersion is compensated through the dispersion compensation optical fiber, the total dispersion of the optical fiber transmission module can be ensured to be close to zero, so that high-speed, large-capacity and long-distance communication is realized.
Preferably, the signal decryption module includes a second optical coupler, a second adjustable optical fiber delay line, a second adjustable optical attenuator, a second photodetector, a third rf amplifier, a fourth rf amplifier, a third phase modulator, a fourth phase modulator, and a second dispersion element;
the output end of the erbium-doped fiber amplifier is connected with the input end of a second optical coupler, the first output end of the second optical coupler is connected with the input end of a second adjustable fiber delay line, the output end of the second adjustable fiber delay line is connected with the input end of a second adjustable optical attenuator, the output end of the second adjustable optical attenuator is connected with the input end of a second photoelectric detector, the first output end of the second photoelectric detector is connected with the input end of a third radio frequency amplifier, the output end of the third radio frequency amplifier is connected with the radio frequency driving end of a third phase modulator, the second output end of the second photoelectric detector is connected with the input end of a fourth radio frequency amplifier, and the output end of the fourth radio frequency amplifier is connected with the radio frequency driving end of the fourth phase modulator; the second output end of the second optical coupler is connected with the input end of the third phase modulator, the output end of the third phase modulator is connected with the input end of the fourth phase modulator, and the output end of the fourth phase modulator is connected with the input end of the signal receiving module.
The encrypted signal is divided into two paths through a second optical coupler, and one path of the encrypted signal is compensated and delayed through a second adjustable optical fiber delay line and is compensated and attenuated through a second adjustable optical attenuator; then the signals are converted into electric signals through a second photoelectric converter, the electric signals are respectively input into a third radio frequency amplifier and a fourth radio frequency amplifier to amplify radio frequency output power, then a third phase modulator and a fourth phase modulator are driven to realize recovery of twice encrypted phases of the encrypted signals, and finally the electric signals are transmitted to a second dispersion compensation component to carry out dispersion compensation so as to realize recovery of the encrypted intensity of the encrypted signals;
the structure of the signal decryption module is symmetrical to that of the signal encryption module, the device parameters in the module are the same as those of the signal encryption module, and finally, the phase and the strength of the encrypted signal are restored to output a decrypted signal.
Preferably, the signal receiving module comprises a demodulator and a detector;
the input end of the demodulator is connected with the output end of the fourth phase modulator, the output end of the demodulator is connected with the input end of the detector, and the output end of the detector outputs the restored original signal.
Preferably, the laser is an external cavity semiconductor laser.
The external cavity semiconductor laser is a semiconductor laser with single frequency, narrow line width and tunable wavelength, and has simple structure, stability, reliability and large tuning range.
Preferably, the first and second dispersion members are chirped fiber gratings or dispersion fibers. The chirped fiber grating has short length, small additional loss and low nonlinearity, realizes dispersion slope compensation while performing dispersion compensation, and also has a filtering function; the dispersive fiber has large negative dispersion, and can also carry out dispersion compensation.
Preferably, in the information encryption module, the dispersion parameter of the first dispersion element, the amplification parameter of the first rf amplifier, the amplification parameter of the second rf amplifier, the delay parameter of the first tunable optical fiber delay line, and the attenuation parameter of the first tunable optical attenuator form a first encryption key, a second encryption key, a third encryption key, a fourth encryption key, and a fifth encryption key, and the first encryption key, the second encryption key, the third encryption key, the fourth encryption key, and the fifth encryption key encrypt the strength and the phase of the original signal, respectively, to generate the encrypted signal.
The first dispersion part performs optical pulse broadening on the original signal so as to achieve the purpose of distortion of light intensity and realize first disturbance on the original signal; different parameters of a first adjustable optical fiber delay line, a first adjustable optical attenuator, a first radio frequency amplifier and a second radio frequency amplifier are combined, the outputs of the first radio frequency amplifier and the second radio frequency amplifier respectively drive a first phase modulator and a second phase modulator, and the phase of an original signal is randomly modulated twice, so that the second time and the third time of disturbance of the original signal are realized; five encryption keys are combined by different parameters to encrypt the original signal, thereby increasing the decryption difficulty of an eavesdropper and enhancing the confidentiality and the safety of the system.
Preferably, in the information decryption module, the dispersion parameter of the second dispersion element, the amplification parameter of the third rf amplifier, the amplification parameter of the fourth rf amplifier, the delay parameter of the second tunable optical fiber delay line, and the attenuation parameter of the second tunable optical attenuator form a first decryption key, a second decryption key, a third decryption key, a fourth decryption key, and a fifth decryption key, which decrypt the phase and the intensity of the encrypted signal respectively to generate the decrypted signal.
In the decryption process, the information decryption module needs to be the same as the information encryption module, the result is symmetrical, and the parameters of the five decryption keys are matched with the parameters of the five encryption keys, so that decryption can be realized, and the confidentiality of the system is greatly enhanced.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention generates original signals by a signal generation module, and the signal encryption module has a dispersion-cascade feedback structure and can encrypt the original signals for multiple times to obtain encrypted signals; the encrypted signal is sent to the signal decryption module through the optical fiber transmission module, the structure of the signal decryption module is symmetrical to that of the signal encryption module, the encrypted signal is decrypted to obtain a decrypted signal, and the decrypted signal is restored to the original signal through the signal receiving module. The signal encryption module encrypts the original signal for multiple times based on the dispersion-cascade feedback structure, thereby greatly enhancing the confidentiality and the safety of the system in the encryption process; meanwhile, the signal decryption module is symmetrical to the signal encryption module in structure, and is used for decrypting multiple encryptions, so that the confidentiality and the safety of the system are enhanced in the decryption process.
Drawings
Fig. 1 is a block diagram of a hardware secure optical fiber communication system based on chromatic dispersion-cascaded feedback encryption according to embodiment 1.
Fig. 2 is a block diagram of a hardware secure optical fiber communication system based on dispersion-concatenated feedback encryption according to embodiment 2.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
The embodiment provides a hardware secret optical fiber communication system based on dispersion-cascade feedback encryption, as shown in fig. 1, the system includes a signal generation module, a signal encryption module, an optical fiber transmission module, a signal decryption module and a signal receiving module;
the output end of the signal generation module is connected with the input end of the signal encryption module, the output end of the signal encryption module is connected with the input end of the optical fiber transmission module, the output end of the optical fiber transmission module is connected with the input end of the signal decryption module, and the output end of the signal decryption module is connected with the input end of the signal receiving module;
the signal generation module generates an original signal and sends the original signal to the signal encryption module; the signal encryption module is provided with a dispersion-cascade feedback structure and is used for encrypting the original signal for multiple times to obtain an encrypted signal; the encrypted signal is sent to the signal decryption module through the optical fiber transmission module, and the signal decryption module decrypts the encrypted signal to obtain a decrypted signal and sends the decrypted signal to the signal receiving module; the signal receiving module restores the decrypted signal to the original signal.
Example 2
The embodiment provides a hardware security optical fiber communication system based on dispersion-cascade feedback encryption, as shown in fig. 2, the system includes a signal generation module, a signal encryption module, an optical fiber transmission module, a signal decryption module and a signal receiving module;
the signal generation module comprises a laser, an electro-optic modulator and a waveform generator;
the output end of the laser is connected with the first input end of the electro-optical modulator, the output end of the waveform generator is connected with the second input end of the electro-optical modulator, and the output end of the electro-optical modulator is connected with the input end of the signal encryption module;
in this embodiment, the laser is an external cavity semiconductor laser, and the external cavity semiconductor laser is a semiconductor laser with a single frequency, a narrow line width, and a tunable wavelength, and has a simple structure, stability, reliability, and a wide tuning range.
The signal encryption module comprises a first dispersion component, a first phase modulator, a second phase modulator, a first optical coupler, a first adjustable optical fiber delay line, a first adjustable optical attenuator, a first photoelectric detector, a first radio frequency amplifier and a second radio frequency amplifier;
the input end of the first dispersion part is connected with the output end of the electro-optic modulator, the output end of the first dispersion part is connected with the input end of the first phase modulator, the output end of the first phase modulator is connected with the input end of the second phase modulator, the output end of the second phase modulator is connected with the input end of the first optical coupler, the first output end of the first optical coupler is connected with the input end of the first adjustable optical fiber delay line, the output end of the first adjustable optical fiber delay line is connected with the input end of the first adjustable optical attenuator, the output end of the first adjustable optical attenuator is connected with the input end of the first photoelectric detector, the first output end of the first photoelectric detector is connected with the input end of the first radio-frequency amplifier, and the output end of the first radio-frequency amplifier is connected with the radio-frequency driving end of the first phase modulator; the second output end of the first photoelectric detector is connected with the input end of a second radio-frequency amplifier, and the output end of the second radio-frequency amplifier is connected with the radio-frequency driving end of a second phase modulator; the second output end of the first optical coupler is connected with the input end of the optical fiber transmission module;
the optical fiber transmission module comprises a single mode optical fiber, a dispersion compensation optical fiber and an erbium-doped optical fiber amplifier;
the input end of the single-mode optical fiber is connected with the second output end of the first optical coupler, the output end of the single-mode optical fiber is connected with the input end of the dispersion compensation optical fiber, the output end of the dispersion compensation optical fiber is connected with the input end of the erbium-doped optical fiber amplifier, and the output end of the erbium-doped optical fiber amplifier is connected with the input end of the signal decryption module;
the signal decryption module comprises a second optical coupler, a second adjustable optical fiber delay line, a second adjustable optical attenuator, a second photoelectric detector, a third radio frequency amplifier, a fourth radio frequency amplifier, a third phase modulator, a fourth phase modulator and a second dispersion component;
the output end of the erbium-doped fiber amplifier is connected with the input end of a second optical coupler, the first output end of the second optical coupler is connected with the input end of a second adjustable fiber delay line, the output end of the second adjustable fiber delay line is connected with the input end of a second adjustable optical attenuator, the output end of the second adjustable optical attenuator is connected with the input end of a second photoelectric detector, the first output end of the second photoelectric detector is connected with the input end of a third radio frequency amplifier, the output end of the third radio frequency amplifier is connected with the radio frequency driving end of a third phase modulator, the second output end of the second photoelectric detector is connected with the input end of a fourth radio frequency amplifier, and the output end of the fourth radio frequency amplifier is connected with the radio frequency driving end of a fourth phase modulator; the second output end of the second optical coupler is connected with the input end of a third phase modulator, the output end of the third phase modulator is connected with the input end of a fourth phase modulator, and the output end of the fourth phase modulator is connected with the input end of the signal receiving module;
in this embodiment, the first and second dispersion members are chirped fiber gratings or dispersion fibers. The chirped fiber grating has short length, small additional loss and low nonlinearity, realizes dispersion slope compensation while performing dispersion compensation, and also has a filtering function; the dispersive fiber has large negative dispersion, and can also carry out dispersion compensation.
The signal receiving module comprises a demodulator and a detector;
the input end of the demodulator is connected with the output end of the fourth phase modulator, the output end of the demodulator is connected with the input end of the detector, and the output end of the detector outputs the restored original signal.
In the specific implementation process, laser output by a laser is input into an electro-optic modulator as an optical carrier, a waveform generator generates a high-order electrical modulation signal and inputs the high-order electrical modulation signal into the electro-optic modulator as a driving signal, and the electro-optic modulator modulates the high-order electrical modulation signal onto the optical carrier to form an original signal; in the present embodiment, a four-level pulse modulation (PAM 4) signal is taken as an example for explanation, but an optical signal of any modulation format may be used as an original signal, such as eight-level pulse amplitude modulation (PAM 8), quadrature Phase Shift Keying (QPSK), hexadecimal quadrature amplitude modulation (16 QAM), and the like; the first phase modulator, the second phase modulator, the first optical coupler, the first adjustable optical fiber delay line, the first adjustable optical attenuator, the first photodetector, the first radio frequency amplifier and the second radio frequency amplifier form a cascade feedback structure, and an original signal is subjected to pulse broadening through the first dispersion part to achieve intensity distortion; modulating a phase by a first phase modulator and a second phase modulator; the first optical coupler divides an original signal into two paths, and one path of the original signal is delayed and attenuated by a first adjustable optical fiber delay line and a first adjustable optical attenuator; then the signal is converted into an electric signal through a first photoelectric detector, the radio frequency output power is amplified through a first radio frequency amplifier and a second radio frequency amplifier respectively, and a first phase modulator and a second phase modulator are driven to realize the modulation of the phase; the method comprises the steps that the encryption of the original signal intensity and phase is realized by setting parameters of a first dispersion component, a first phase modulator, a second phase modulator, a first adjustable optical fiber delay line and a first adjustable optical attenuator, and finally, an encrypted signal is output by a second output end of a first optical coupler; the encrypted signal is transmitted to a dispersion compensation optical fiber to compensate dispersion through a single mode optical fiber, and is transmitted to a decryption module after being amplified by an erbium-doped optical fiber amplifier; the mode dispersion of the single-mode optical fiber is small, so that optical signals can be transmitted for a long distance in a wide frequency band, and long-distance transmission is realized; the dispersion compensation optical fiber has large negative dispersion, an optical signal output from the single-mode optical fiber has positive dispersion and positive dispersion slope, and after the optical signal passes through the dispersion compensation optical fiber and is subjected to dispersion compensation, the total dispersion of the optical fiber transmission module can be ensured to be close to zero, so that high-speed, high-capacity and long-distance communication is realized; the encrypted signal is divided into two paths through a second optical coupler, and one path of the encrypted signal is compensated and delayed through a second adjustable optical fiber delay line and is compensated and attenuated through a second adjustable optical attenuator; then the second photoelectric converter is converted into an electric signal, the electric signal is respectively input into a third radio frequency amplifier and a fourth radio frequency amplifier to amplify radio frequency output power, then a third phase modulator and a fourth phase modulator are driven to realize two-time phase compensation, and finally the electric signal is transmitted to a second dispersion compensation component to carry out dispersion compensation; the structure of the signal decryption module is symmetrical to that of the signal encryption module, the device parameters in the module are the same as those of the signal encryption module, and finally the phase and the intensity of the encrypted signal are recovered to output a decrypted signal; finally, the decrypted signal is demodulated by a demodulator, detected by a detector and output a restored original signal.
The dispersion parameter of the first dispersion component, the amplification parameter of the first radio frequency amplifier, the amplification parameter of the second radio frequency amplifier, the delay parameter of the first adjustable optical fiber delay line and the attenuation parameter of the first adjustable optical attenuator form a first encryption key, a second encryption key, a third encryption key, a fourth encryption key and a fifth encryption key, and the intensity and the phase of the original signal are encrypted respectively to generate an encrypted signal. The first dispersion part performs optical pulse broadening on the original signal so as to achieve the purpose of distortion of light intensity and realize first disturbance on the original signal; different parameters of a first adjustable optical fiber delay line, a first adjustable optical attenuator, a first radio frequency amplifier and a second radio frequency amplifier are combined, the outputs of the first radio frequency amplifier and the second radio frequency amplifier respectively drive a first phase modulator and a second phase modulator, and the phase of an original signal is randomly modulated twice to realize the second time and the third time of disturbance of the original signal; five encryption keys are combined by different parameters to encrypt the original signal, thereby increasing the decryption difficulty of an eavesdropper and enhancing the confidentiality and the safety of the system. The mode dispersion of the single-mode optical fiber is small, so that optical signals can be transmitted for a long distance in a wide frequency band, and long-distance transmission is realized; in the optical fiber transmission module, the dispersion compensation optical fiber has large negative dispersion, an optical signal output from the single-mode optical fiber has positive dispersion and positive dispersion slope, and after the dispersion is compensated through the dispersion compensation optical fiber, the total dispersion of the optical fiber transmission module can be ensured to be close to zero, so that high-speed, large-capacity and long-distance communication is realized. The system can be realized by using the existing commercial devices and optical fiber channels, and is perfectly compatible with the existing optical fiber network system.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A hardware secret optical fiber communication system based on dispersion-cascade feedback encryption is characterized by comprising a signal generation module, a signal encryption module, an optical fiber transmission module, a signal decryption module and a signal receiving module;
the output end of the signal generation module is connected with the input end of the signal encryption module, the output end of the signal encryption module is connected with the input end of the optical fiber transmission module, the output end of the optical fiber transmission module is connected with the input end of the signal decryption module, and the output end of the signal decryption module is connected with the input end of the signal receiving module;
the signal generation module generates an original signal and sends the original signal to the signal encryption module; the signal encryption module is provided with a dispersion-cascade feedback structure and is used for encrypting the original signal for multiple times to obtain an encrypted signal; the encrypted signal is sent to the signal decryption module through the optical fiber transmission module, the structure of the signal decryption module is symmetrical to that of the signal encryption module, the encrypted signal is decrypted for multiple times, and the decrypted signal is sent to the signal receiving module; the signal receiving module restores the decrypted signal to the original signal.
2. The hardware privacy-based optical fiber communication system based on dispersion-cascade feedback encryption of claim 1, wherein the signal generation module comprises a laser, an electro-optical modulator and a waveform generator;
the output end of the laser is connected with the first input end of the electro-optical modulator, the output end of the waveform generator is connected with the second input end of the electro-optical modulator, and the output end of the electro-optical modulator is connected with the input end of the signal encryption module;
the laser output by the laser is input into the electro-optical modulator as an optical carrier, the waveform generator generates a high-order electrical modulation signal and inputs the high-order electrical modulation signal into the electro-optical modulator as a driving signal, and the electro-optical modulator modulates the high-order electrical modulation signal onto the optical carrier to form an original signal.
3. The hardware privacy fiber optic communication system based on dispersion-cascade feedback encryption of claim 2, wherein the signal encryption module comprises a first dispersion element, a first phase modulator, a second phase modulator, a first optical coupler, a first adjustable fiber delay line, a first adjustable optical attenuator, a first photodetector, a first radio frequency amplifier and a second radio frequency amplifier;
the input end of the first dispersion part is connected with the output end of the electro-optic modulator, the output end of the first dispersion part is connected with the input end of the first phase modulator, the output end of the first phase modulator is connected with the input end of the second phase modulator, the output end of the second phase modulator is connected with the input end of the first optical coupler, the first output end of the first optical coupler is connected with the input end of the first adjustable optical fiber delay line, the output end of the first adjustable optical fiber delay line is connected with the input end of the first adjustable optical attenuator, the output end of the first adjustable optical attenuator is connected with the input end of the first photoelectric detector, the first output end of the first photoelectric detector is connected with the input end of the first radio-frequency amplifier, and the output end of the first radio-frequency amplifier is connected with the radio-frequency driving end of the first phase modulator; the second output end of the first photoelectric detector is connected with the input end of a second radio frequency amplifier, and the output end of the second radio frequency amplifier is connected with the radio frequency driving end of a second phase modulator; and the second output end of the first optical coupler is connected with the input end of the optical fiber transmission module.
4. The hardware privacy fiber optic communication system based on dispersion-cascade feedback encryption of claim 3, wherein the fiber transmission module comprises a single mode fiber, a dispersion compensating fiber and an erbium doped fiber amplifier;
the input end of the single-mode optical fiber is connected with the second output end of the first optical coupler, the output end of the single-mode optical fiber is connected with the input end of the dispersion compensation optical fiber, the output end of the dispersion compensation optical fiber is connected with the input end of the erbium-doped optical fiber amplifier, and the output end of the erbium-doped optical fiber amplifier is connected with the input end of the signal decryption module;
the encrypted signal is transmitted to the dispersion compensation fiber to compensate dispersion through the single mode fiber, and then transmitted to the decryption module after being amplified by the erbium-doped fiber amplifier.
5. The hardware privacy fiber optic communication system based on dispersion-cascade feedback encryption of claim 4, wherein the signal decryption module comprises a second optical coupler, a second adjustable fiber delay line, a second adjustable optical attenuator, a second photodetector, a third radio frequency amplifier, a fourth radio frequency amplifier, a third phase modulator, a fourth phase modulator, and a second dispersion component;
the output end of the erbium-doped fiber amplifier is connected with the input end of a second optical coupler, the first output end of the second optical coupler is connected with the input end of a second adjustable fiber delay line, the output end of the second adjustable fiber delay line is connected with the input end of a second adjustable optical attenuator, the output end of the second adjustable optical attenuator is connected with the input end of a second photoelectric detector, the first output end of the second photoelectric detector is connected with the input end of a third radio frequency amplifier, the output end of the third radio frequency amplifier is connected with the radio frequency driving end of a third phase modulator, the second output end of the second photoelectric detector is connected with the input end of a fourth radio frequency amplifier, and the output end of the fourth radio frequency amplifier is connected with the radio frequency driving end of a fourth phase modulator; the second output end of the second optical coupler is connected with the input end of the third phase modulator, the output end of the third phase modulator is connected with the input end of the fourth phase modulator, and the output end of the fourth phase modulator is connected with the input end of the signal receiving module.
6. The hardware security fiber optic communication system based on chromatic dispersion-cascaded feedback encryption of claim 5, wherein the signal receiving module comprises a demodulator and a detector;
the input end of the demodulator is connected with the output end of the fourth phase modulator, the output end of the demodulator is connected with the input end of the detector, and the output end of the detector outputs the restored original signal.
7. A hardware privacy fiber optic communication system based on dispersion-cascaded feedback encryption according to claim 2, wherein the laser is an external cavity semiconductor laser.
8. The system according to claim 3 or 5, wherein the first and second dispersion units are chirped fiber gratings or dispersion fibers.
9. The system according to claim 3, wherein in the information encryption module, the dispersion parameter of the first dispersion element, the amplification parameter of the first RF amplifier, the amplification parameter of the second RF amplifier, the delay parameter of the first tunable fiber delay line, and the attenuation parameter of the first tunable optical attenuator form a first encryption key, a second encryption key, a third encryption key, a fourth encryption key, and a fifth encryption key, and the first encryption key encrypts the strength and the phase of the original signal to generate the encrypted signal.
10. The system according to claim 5, wherein in the information decryption module, the dispersion parameter of the second dispersion element, the amplification parameter of the third RF amplifier, the amplification parameter of the fourth RF amplifier, the delay parameter of the second tunable fiber delay line, and the attenuation parameter of the second tunable optical attenuator form a first decryption key, a second decryption key, a third decryption key, a fourth decryption key, and a fifth decryption key, which decrypt the strength and phase of the encrypted signal to generate the decrypted signal.
CN202211035273.0A 2022-08-26 2022-08-26 Hardware secret optical fiber communication system based on dispersion-cascade feedback encryption Pending CN115396094A (en)

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