CN113794559A - Physical layer secret communication system and method based on dispersion-phase encryption - Google Patents
Physical layer secret communication system and method based on dispersion-phase encryption Download PDFInfo
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- 239000006185 dispersion Substances 0.000 claims abstract description 77
- 239000013307 optical fiber Substances 0.000 claims abstract description 19
- 230000010287 polarization Effects 0.000 claims description 42
- 230000005540 biological transmission Effects 0.000 claims description 34
- 239000000835 fiber Substances 0.000 claims description 31
- 239000004065 semiconductor Substances 0.000 claims description 11
- 238000011084 recovery Methods 0.000 claims description 5
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 3
- 229910052691 Erbium Inorganic materials 0.000 claims 1
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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
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
- H04L9/0858—Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2543—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to fibre non-linearities, e.g. Kerr effect
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
Abstract
The invention provides a physical layer secret communication system and method based on dispersion-phase encryption, and relates to the technical field of photoelectricity and optical fiber communication. The invention uses the encryption module composed of the dispersion component and the phase modulator to encrypt the information under the combined action of dispersion and phase modulation. And recovering the information in phase and amplitude by using a symmetrical decryption module. Because the encryption module and the decryption module are used for encrypting and decrypting keys which are not transmitted in a link, the security of encryption and decryption is ensured, and even if an eavesdropper knows the structure of the invention, the decryption process of the eavesdropper cannot be synchronous with the encrypted signal and cannot be decrypted, thereby improving the security of signal transmission. The present system is applicable to all information modulation formats suitable for optical modulation.
Description
Technical Field
The invention relates to the technical field of photoelectric communication, in particular to a system and a method for physical layer secret communication based on dispersion-phase encryption.
Background
With the rapid development of communication technology, people have higher and higher requirements on large capacity, high speed and safe communication, and meanwhile, the security of information in a communication system is concerned by countries around the world, and how to ensure the information safe communication becomes a crucial problem. Most of the conventional security enhancement schemes proposed before are mainly implemented in the upper layer of the optical network, and are based on digital algorithms to encrypt data, such as the typical Advanced Encryption Standard (AES). However, due to the certainty of the algorithm and the simple computational complexity, such encryption method will face serious security threats, such as emerging quantum computation, and even if the computation power is fast enough, the encrypted message may still be intercepted by an attack.
Several physical layer encryption schemes have been proposed in recent years, such as quantum communication, Optical Code Division Multiple Access (OCDMA), chaotic optical communication. These schemes can effectively improve the security and confidentiality of data, but still have some disadvantages. Quantum communication can theoretically provide infinite security due to uncertainty of quantum mechanics, but quantum communication technology is limited by its strict equipment requirements and key distribution rate, is difficult to apply in high-speed optical communication, and is yet to be fully compatible with existing commercial devices and fiber channels. The Optical Code Division Multiple Access (OCDMA) technology is implemented by overlapping a plurality of channels in the same frequency space, and has strong anti-interference capability, but the actual security of the technology still remains to be solved.
Publication No.: CN103297221A, the chaos secret communication system based on the digital chaos coding algorithm of 2013-09-11, this invention realizes encryption communication by generating the chaos cipher of complicated digit from the complicated chaos network, have the advantage that the hardware optical network encrypts and can be compatible with most commercial devices. However, the technical solution of the present invention requires a transceiver with matched parameters to ensure chaotic synchronization, but the conventional external cavity semiconductor laser has a security problem of time delay feature exposure due to its fixed external cavity, and the chaotic bandwidth is limited due to the relaxation oscillation frequency, and the limited chaotic carrier bandwidth limits the transmission rate of chaotic optical communication, so that it is difficult to be compatible with the existing high-speed optical fiber communication system.
Disclosure of Invention
The present invention has been made to overcome the above-mentioned problems, and an object of the present invention is to provide a system and method for physical layer secure communication based on dispersion-phase encryption, which can support high-speed data transmission and is highly compatible with existing commercial optical components and optical fiber transmission systems.
The technical scheme of the invention is as follows:
a physical layer secure communication system based on dispersion-phase encryption, the system comprising: the device comprises a sending end, a transmission optical fiber and a receiving end;
the transmitting end comprises: the device comprises a signal generating module and an encrypting module; the encryption module comprises a first dispersion part and a first phase modulator, and the receiving end comprises a decryption module; the decryption block comprises a second phase modulator and a second dispersion component; the transmitting end, the transmission optical fiber and the receiving end are connected in sequence, specifically:
the optical signal encryption method comprises the steps that a signal generation module sends an optical signal to be encrypted, an encryption module encrypts the optical signal, wherein a first dispersion component enables the amplitude of the optical signal to be distorted to achieve time domain encryption, a first phase modulator disturbs the phase of the optical signal to achieve phase encryption, the optical signal is subjected to time domain encryption and phase encryption to obtain an encrypted optical signal, and a sending end sends the encrypted optical signal to a receiving end through a transmission optical fiber; and after the receiving end receives the encrypted optical signal, the decryption module decrypts the encrypted optical signal, wherein the second phase modulator recovers the phase of the encrypted optical signal, and the second dispersion component recovers the amplitude of the encrypted optical signal to obtain the decrypted optical signal.
The technical scheme provides a physical layer secret communication system based on dispersion-phase encryption, which utilizes an encryption module consisting of a dispersion component and a phase modulator to encrypt information under the combined action of dispersion and phase modulation. And recovering the information in phase and amplitude by using a symmetrical decryption module. Because the encryption module and the decryption module are used for encrypting and decrypting keys which are not transmitted in a link, the security of encryption and decryption is ensured, and even if an eavesdropper knows the structure of the invention, the decryption process of the eavesdropper cannot be synchronous with the encrypted signal and cannot be decrypted, thereby improving the security of signal transmission. The present system is applicable to all information modulation formats suitable for optical modulation.
Furthermore, the transmitting end further comprises a first optical amplifier, the receiving end further comprises a second optical amplifier, the first optical amplifier is arranged between the signal generating module and the encryption module, the input end of the second optical amplifier is connected with the transmission optical fiber, the output end of the second optical amplifier is connected with the decryption module, and the first optical amplifier and the second optical amplifier are both used for amplifying the power of the optical signal.
In the above technical solution, the optical amplifier is used for amplifying an optical signal.
Further, the first optical amplifier and the second optical amplifier are both erbium-doped fiber amplifiers.
Further, the signal generation module includes: the device comprises an external cavity semiconductor laser, a carrier intensity modulator and a data generation module;
the external cavity semiconductor laser emits an optical carrier used for carrying data to be encrypted, the optical carrier is input into the carrier intensity modulator, the driving end of the carrier intensity modulator is electrically connected with the output end of the data generation module, the carrier intensity modulator modulates the data to be encrypted generated by the data generation module onto the optical carrier, so that an optical signal carrying the data to be encrypted is emitted, and the optical signal is transmitted to the first optical amplifier.
Further, the carrier intensity modulator is a mach-zehnder modulator.
Further, the encryption module further comprises: the system comprises a first optical circulator, a first polarization controller and a first key generation module; the decryption module also comprises a second polarization controller, a second key generation module and a second optical circulator; the receiving end also comprises a photoelectric detector;
the output end of the first optical amplifier is connected with the first port of the first optical circulator, the first dispersion component is connected with the second port of the first optical circulator, the third port of the first optical circulator is used as the output end and connected with the input end of the first polarization controller, the output end of the first polarization controller is connected with the input end of the first phase modulator, the first polarization controller adjusts the polarization direction of an optical signal to enable the polarization direction of the optical signal to meet the requirement of the first phase modulator, the output end of the first key generation module is electrically connected with the drive end of the first phase modulator, the first phase modulator performs phase modulation on the optical signal according to a key generated by the first key generation module to enable the optical signal to realize phase encryption, and the output end of the first phase modulator is connected with a transmission optical fiber;
the transmission optical fiber is connected with the input end of a second optical amplifier, the output end of the second optical amplifier is connected with the input end of a second polarization controller, the output end of the second polarization controller is connected with the input end of a second phase modulator, the second polarization controller adjusts the polarization direction of an optical signal to enable the polarization direction of the optical signal to meet the requirements of the second phase modulator, the output end of a second secret key generation module is electrically connected with the driving end of the second phase modulator, the second phase modulator conducts phase modulation on the optical signal according to a secret key generated by the second secret key generation module to enable the optical signal to realize phase decryption, the output end of the second phase modulator is connected with the first port of the second optical circulator, a second dispersion component is connected with the second port of the second optical circulator, and the third port of the second optical circulator is used as the output end to be connected with the photoelectric detector.
Furthermore, the key amplitudes generated by the first key generation module and the second key generation module are the same and the amplitudes are opposite; the first dispersion member and the second dispersion member have opposite dispersion values.
Further, the keys generated by the first key generation module and the second key generation module are pseudo-random sequences.
Further, the first dispersion part and the second dispersion part both adopt chirped fiber gratings.
A physical layer secret communication method based on dispersion-phase encryption comprises the following steps:
s1, generating an optical carrier for carrying data to be encrypted;
s2, modulating the data to be encrypted onto an optical carrier to generate an optical signal carrying the data to be encrypted;
s3, utilizing the first dispersion component (106) to distort the amplitude of the optical signal to realize time domain encryption;
s4, phase encryption is carried out on the optical signal after the time domain encryption by utilizing a first phase modulator (108) to obtain an encrypted optical signal;
s5, the sending end (1) sends the encrypted optical signal to the receiving end (3) through the transmission optical fiber (2);
s6, carrying out phase recovery on the encrypted optical signal by using a second phase modulator (303);
s7, the amplitude of the encrypted optical signal is restored by the second dispersion unit (306) to obtain a decrypted optical signal.
The technical scheme of the invention provides a physical layer secret communication system and a method based on dispersion-phase encryption, and compared with the prior art, the technical scheme of the invention has the beneficial effects that: the information is encrypted by an encryption module consisting of a dispersion component and a phase modulator under the combined action of dispersion and phase modulation. And recovering the information in phase and amplitude by using a symmetrical decryption module. Because the encryption module and the decryption module are used for encrypting and decrypting keys which are not transmitted in a link, the security of encryption and decryption is ensured, and even if an eavesdropper knows the structure of the invention, the decryption process of the eavesdropper cannot be synchronous with the encrypted signal and cannot be decrypted, thereby improving the security of signal transmission. The present system is applicable to all information modulation formats suitable for optical modulation.
Drawings
FIG. 1 is a schematic diagram of a physical layer secure communication system based on dispersion-phase encryption;
FIG. 2 is a diagram of an original signal and encrypted and decrypted waveforms and eyes;
FIG. 3 is a graph of the original signal and the spectrum after encryption and decryption;
wherein: 101. an external cavity semiconductor laser; 102. a carrier intensity modulator; 103. a data generation module; 104. a first optical amplifier; 105. a first optical circulator; 106. a first dispersion member; 107. a first polarization controller; 108. a first phase modulator; 109. a first key generation module; 201. a single mode optical fiber; 202. a dispersion compensating fiber; 301. a second optical amplifier; 302. a second polarization controller; 303. a second phase modulator; 304. a second key generation module; 305. a second optical circulator; 306. a second dispersive component; 307. a photodetector.
Detailed Description
For clarity of explanation, the present invention will be further explained with reference to the embodiments and the drawings, but the scope of the present invention should not be limited thereby.
Example 1
A physical layer secure communication system based on dispersion-phase encryption, the system comprising: the device comprises a sending end 1, a receiving end 3 and a transmission optical fiber 2;
the transmitting end 1 includes: the device comprises a signal generating module and an encrypting module; the encryption module comprises a first dispersion unit 106 and a first phase modulator 108, and the receiving end 3 comprises a decryption module; the decryption block comprises a second phase modulator 303 and a second dispersion component 306; sending terminal 1, transmission fiber 2 and receiving terminal 3 connect gradually, specifically:
the signal generating module sends an optical signal carrying data to be encrypted, and the encryption module encrypts the optical signal, wherein the first dispersion component 106 distorts the amplitude of the optical signal, the first phase modulator 108 disturbs the phase of the optical signal, the encryption module encrypts both the time domain and the phase of the optical signal through the first dispersion component 106 and the first phase modulator 108 to obtain an encrypted optical signal, and the transmitting end 1 transmits the encrypted optical signal to the receiving end 3 through the transmission optical fiber 2; after the receiving end receives the encrypted optical signal, the decryption module decrypts the encrypted optical signal, wherein the second phase modulator 303 recovers the phase of the encrypted optical signal, and the second dispersion component 306 recovers the amplitude of the encrypted optical signal to obtain the decrypted optical signal.
In this embodiment, an encryption module composed of a dispersion component and a phase modulator is used to encrypt information under the combined action of dispersion and phase modulation. And recovering the information in phase and amplitude by using a symmetrical decryption module. Because the encryption module and the decryption module are used for encrypting and decrypting keys which are not transmitted in a link, the security of encryption and decryption is ensured, and even if an eavesdropper knows the structure of the invention, the decryption process of the eavesdropper cannot be synchronous with the encrypted signal and cannot be decrypted, thereby improving the security of signal transmission. The present system is applicable to all information modulation formats suitable for optical modulation.
Example 2
Fig. 1 is a schematic diagram of a physical layer secure communication system based on dispersion-phase encryption. As can be seen from fig. 1, at a transmitting end 1, an External cavity semiconductor laser 101 (ECSL) with a center wavelength λ emits an optical carrier for carrying data to be encrypted, the optical carrier output by the External cavity semiconductor laser 101 enters a carrier intensity modulator 102, an output end of a data generating module 103 is electrically connected to a driving end of the carrier intensity modulator 102, and the carrier intensity modulator 102 modulates the data to be encrypted generated by the data generating module 103 onto the optical carrier to generate a modulated optical signal to be encrypted and transmits the optical signal to be encrypted to a first optical amplifier 104.
An optical signal to be encrypted enters an encryption module composed of a first dispersion unit 106 and a first Phase Modulator 108(Phase Modulator, PM) to encrypt the optical signal after the optical power of the optical signal to be encrypted is amplified by a first optical Amplifier 104 (EDFA), the first dispersion unit 106 distorts the amplitude of the optical signal, the first Phase Modulator disturbs the Phase of the optical signal, a driving end of the first Phase Modulator 108(PM1) is connected with an output end of a first key generation module 109, the first Phase Modulator 108 conducts Phase modulation on the optical signal according to a key generated by the first key generation module 109, the Phase of the optical signal is disturbed, and the time domain and the Phase of the optical signal are encrypted under the combined action of dispersion and Phase modulation.
In the transmission Fiber 2, the encrypted optical signal enters a transmission link composed of a Single Mode Fiber 201 (SMF) and a Dispersion Compensation Fiber 202 (DCF) matched with a Dispersion value thereof, and is transmitted.
At the receiving end 3, the transmission power of the encrypted optical signal is lost after passing through the transmission fiber 2, the optical transmission power is amplified by using the second optical amplifier 301(EDFA2), and then the encrypted optical signal is decrypted and recovered by using a decryption module symmetrical to the encryption module of the transmitting end 1, wherein the decryption module includes a second phase modulator 303(PM2) having the same half-wave voltage and bandwidth as the first phase modulator 108 and a second dispersion component 306 having a dispersion value opposite to that of the first dispersion component 106 of the transmitting end 1. The output end of the second key generation module 304 is electrically connected to the driving end of the second phase modulator 303, the key generated by the second key generation module 304 is used as a driving signal of the second phase modulator 303(PM2), the second phase modulator 303 recovers the disturbed phase of the encrypted optical signal at the encryption module at the transmitting end, the second dispersion component 306 recovers the amplitude of the encrypted optical signal, the recovered optical signal is subjected to photoelectric conversion in the photodetector 307, and then the optical signal is sent to an oscilloscope for signal quality recovery detection.
According to the specific embodiment, the invention provides a physical layer secret communication system based on dispersion-phase encryption, which utilizes an encryption module consisting of a dispersion component and a phase modulator to encrypt information under the combined action of dispersion and phase modulation. And recovering the information in phase and amplitude by using a symmetrical decryption module. Because the encryption module and the decryption module are used for encrypting and decrypting keys which are not transmitted in a link, the security of encryption and decryption is ensured, and even if an eavesdropper knows the structure of the invention, the decryption process of the eavesdropper cannot be synchronous with the encrypted signal and cannot be decrypted, thereby improving the security of signal transmission. The present system is applicable to all information modulation formats suitable for optical modulation.
Example 3
Fig. 1 is a schematic diagram of a physical layer secure communication system based on dispersion-phase encryption. As can be seen from fig. 1, at a transmitting end 1, an External cavity semiconductor laser 101 (ECSL) with a center wavelength λ emits an optical carrier for carrying data to be encrypted, the optical carrier output by the External cavity semiconductor laser 101 enters a carrier intensity modulator 102, an output end of a data generating module 103 is electrically connected to a driving end of the carrier intensity modulator 102, and the carrier intensity modulator 102 modulates the data to be encrypted generated by the data generating module 103 onto the optical carrier to generate a modulated optical signal to be encrypted and transmits the optical signal to be encrypted to a first optical amplifier 104.
An optical signal to be encrypted enters an encryption module to be encrypted after being amplified by a first optical Amplifier 104 (EDFA), wherein the encryption module comprises a first optical circulator 105, a first dispersion part 106, a first polarization controller 107, a first phase modulator 108 and a first key generation module 109, an output end of the first optical Amplifier 104 is connected with a first port of the first optical circulator 105, the first dispersion part 106 is connected with a second port of the first optical circulator 105, a third port of the first optical circulator 105 is connected with an input end of the first polarization controller 107, an output end of the first polarization controller 107 is connected with an input end of the first phase modulator 108, and an output end of the first key generation module 109 is connected with a driving end of the first phase modulator 108;
when the first dispersion component 106 adopts a chirped fiber grating, the first optical circulator 105 enables the encryption module to utilize the reflected light of the chirped fiber grating, since the phase modulator is a polarization sensitive device and only acts on the polarized light in a specific direction, a first polarization controller 107 is arranged in front of the first phase modulator 108, the polarization state of the optical signal is adjusted by the first polarization controller 107, so that the polarization direction of the optical signal meets the requirement of the first phase modulator 108, the first dispersion component 106 distorts the amplitude of the optical signal, the first phase modulator 108 performs phase modulation on the optical signal according to the key generated by the first key generation module 109, so as to disturb the phase of the optical signal, and both the time domain and the phase of the optical signal are encrypted under the combined action of dispersion and phase modulation.
In this embodiment, the carrier intensity Modulator 102 is a Mach-Zehnder Modulator (MZM).
Optionally, the optical signal to be encrypted generated by the carrier intensity modulator 102 may be an optical signal with any modulation format, such as a Non-return-to-zero (NRZ) signal, an On-Off Keying (OOK) signal, a Quadrature Amplitude Modulation (QAM) signal, a Quadrature Phase Shift Keying (QPSK) signal, and the like, and the optical signal with any modulation format may be used as an input signal for encrypted transmission.
The transmission Fiber 2 includes a Single Mode Fiber 201 (SMF) and a Dispersion Compensation Fiber 202 (DCF), and in the transmission Fiber 2, the encrypted signal enters a transmission link composed of the Single Mode Fiber 201 (SMF) and the Dispersion Compensation Fiber 202 (DCF) whose Dispersion value matches the Single Mode Fiber 201 (SMF) for transmission.
At the receiving end 3, the transmission power of the encrypted optical signal is lost after passing through the transmission fiber 2, the optical transmission power is amplified by using the second optical amplifier 301(EDFA2), and then the encrypted optical signal is decrypted and recovered by using a decryption module symmetrical to the encryption module at the transmitting end 1, wherein the decryption module includes: a second polarization controller 302, a second phase modulator 303, a second key generation module 304, a second optical circulator 305, a second dispersion component 306;
the output end of the dispersion compensation fiber 202 is connected to the input end of a second optical amplifier 301, the output end of the second optical amplifier 301 is connected to the input end of a second polarization controller 302, the output end of the second polarization controller 302 is connected to the input end of a second phase modulator 303, the output end of a second key generation module 304 is connected to the drive end of the second phase modulator 303, the output end of the second phase modulator 303 is connected to the first port of a second optical circulator 305, a second dispersion component 306 is connected to the second port of the second optical circulator 305, and the third port of the second optical circulator 305 is connected to a photodetector 307.
When the second dispersion component 306 adopts the chirped fiber grating, the second dispersion component 306 enables the decryption module to use the reflected light of the chirped fiber grating, and since the phase modulator is a polarization sensitive device and only acts on the polarized light in a specific direction, the second polarization controller 302 is arranged in front of the second phase modulator 303, and the polarization state of the optical signal is adjusted by the second polarization controller 302, so that the polarization direction of the optical signal meets the requirement of the second phase modulator 303.
The half-wave voltage and the bandwidth of the second phase modulator 303 are the same as those of the first phase modulator 108, the dispersion value of the second dispersion component 306 is opposite to that of the first dispersion component 106, the output end of the second key generation module 304 is electrically connected with the driving end of the second phase modulator 303, the key generated by the second key generation module 304 is used as a driving signal of the second phase modulator 303(PM2), the second phase modulator 303 recovers the disturbed phase of the encrypted optical signal at the encryption module at the transmitting end, the second dispersion component 306 recovers the amplitude of the encrypted optical signal, the recovered optical signal is subjected to photoelectric conversion in the photoelectric detector 307, and then the optical signal quality recovery detection is carried out in an oscilloscope.
In this embodiment, the first optical amplifier 104 and the second optical amplifier 301 both use erbium-doped fiber amplifiers, the keys generated by the first key generation module 109 and the second key generation module 304 have the same amplitude and opposite amplitudes, and the keys generated by the first key generation module 109 and the second key generation module 304 can be flexibly adjusted, optionally, the keys can be pseudo-random bit sequences or chaos sequences or noise sequences, etc.; like the key, the first dispersion element 106 and the second dispersion element 306 may be chosen differently, for example, using chirped fiber gratings, or alternatively dispersive fibers, etc.
It can be seen from this embodiment that the present invention provides a physical layer secure communication system based on dispersion-phase encryption, which utilizes an encryption module composed of a dispersion component and a phase modulator to encrypt information under the combined action of dispersion and phase modulation. And recovering the information in phase and amplitude by using a symmetrical decryption module.
Fig. 2 is a waveform diagram and an eye diagram of an original signal after encryption and decryption, and fig. 3 is a spectrum diagram of the original signal after encryption and decryption. As can be seen from fig. 2 and 3, the amplitude of the optical signal encrypted by the transmitting end 1 is distorted, and the information is encrypted in both time domain and phase; because the encryption module and the decryption module are used for encrypting and decrypting keys which are not transmitted in a link, the security of encryption and decryption is ensured, and even if an eavesdropper knows the structure of the invention, the decryption process of the eavesdropper cannot be synchronous with the encrypted signal and cannot be decrypted, thereby improving the security of signal transmission. The present system is applicable to all information modulation formats suitable for optical modulation.
Example 4
The embodiment provides a physical layer secret communication method based on dispersion-phase encryption, which comprises the following steps:
s1, generating an optical carrier for carrying data to be encrypted;
s2, modulating the data to be encrypted onto an optical carrier to generate an optical signal carrying the data to be encrypted;
s3, utilizing the first dispersion component (106) to distort the amplitude of the optical signal to realize time domain encryption;
s4, phase encryption is carried out on the optical signal after the time domain encryption by utilizing a first phase modulator (108) to obtain an encrypted optical signal;
s5, the sending end (1) sends the encrypted optical signal to the receiving end (3) through the transmission optical fiber (2);
s6, carrying out phase recovery on the encrypted optical signal by using a second phase modulator (303);
s7, the amplitude of the encrypted optical signal is restored by the second dispersion unit (306) to obtain a decrypted optical signal.
In this embodiment, the optical carrier described in step S1 is generated by an external cavity semiconductor laser (101), the carrier intensity modulator (102) is used to modulate the data to be encrypted in step S2, the carrier intensity modulator (102) is a mach-zehnder modulator, and the second dispersion component (306) in step S7 is the same type as the first dispersion component (106) described in step S3, and is a chirped fiber grating or a dispersive optical fiber, and the dispersion values of the two are opposite.
Claims (10)
1. A physical layer secure communication system based on dispersion-phase encryption, the system comprising: the device comprises a sending end (1), a transmission optical fiber (2) and a receiving end (3);
the transmitting end (1) comprises: the device comprises a signal generating module and an encrypting module; the encryption module comprises a first dispersion part (106) and a first phase modulator (108), and the receiving end (3) comprises a decryption module; the decryption module comprises a second phase modulator (303) and a second dispersive component (306); sending end (1), transmission fiber (2) and receiving end (3) connect gradually, specifically:
the optical signal encryption method comprises the steps that a signal generation module sends an optical signal to be encrypted, an encryption module encrypts the optical signal, wherein a first dispersion component (106) enables the amplitude of the optical signal to be distorted to achieve time domain encryption, a first phase modulator (108) disturbs the phase of the optical signal to achieve phase encryption, the optical signal is subjected to time domain encryption and phase encryption to obtain an encrypted optical signal, and a sending end (1) sends the encrypted optical signal to a receiving end (3) through a transmission optical fiber (2); after a receiving end (3) receives the encrypted optical signal, a decryption module decrypts the encrypted optical signal, wherein the second phase modulator (303) recovers the phase of the encrypted optical signal, and the second dispersion component (306) recovers the amplitude of the encrypted optical signal to obtain the decrypted optical signal.
2. The system according to claim 1, wherein the transmitting end (1) further includes a first optical amplifier (104), the receiving end (3) further includes a second optical amplifier (301), the first optical amplifier (104) is disposed between the signal generating module and the encryption module, an input end of the second optical amplifier (301) is connected to the transmission fiber (2), an output end of the second optical amplifier (301) is connected to the decryption module, and both the first optical amplifier (104) and the second optical amplifier (301) are configured to amplify the power of the optical signal.
3. A physical layer secure communication system based on dispersion-phase encryption according to claim 2, characterized in that said first optical amplifier (104) and said second optical amplifier (301) are both erbium doped fiber amplifiers.
4. The system of claim 2, wherein the signal generating module comprises: an external cavity semiconductor laser (101), a carrier intensity modulator (102) and a data generation module (103);
the external cavity semiconductor laser (101) emits an optical carrier used for carrying data to be encrypted, the optical carrier is input into a carrier intensity modulator (102), a driving end of the carrier intensity modulator (102) is electrically connected with an output end of a data generation module (103), the carrier intensity modulator (102) modulates the data to be encrypted generated by the data generation module (103) onto the optical carrier, so that an optical signal carrying the data to be encrypted is emitted, and the optical signal is transmitted to a first optical amplifier (104).
5. A physical layer secure communication system based on chromatic dispersion-phase encryption according to claim 4, characterized in that the carrier intensity modulator (102) is a Mach-Zehnder modulator.
6. The system according to any of claims 2 to 5, wherein the encryption module further comprises: a first optical circulator (105), a first polarization controller (107), a first key generation module (109); the decryption module further comprises a second polarization controller (302), a second key generation module (304), a second optical circulator (305); the receiving end (3) also comprises a photoelectric detector (307);
the output end of the first optical amplifier (104) is connected with the first port of the first optical circulator (105), the first dispersion component (106) is connected with the second port of the first optical circulator (105), the third port of the first optical circulator (105) is used as the output end and connected with the input end of the first polarization controller (107), the output end of the first polarization controller (107) is connected with the input end of the first phase modulator (108), the first polarization controller (107) adjusts the polarization direction of the optical signal to enable the polarization direction of the optical signal to meet the requirement of the first phase modulator (108), the output end of the first key generation module (109) is electrically connected with the drive end of the first phase modulator (108), the first phase modulator (108) performs phase modulation on the optical signal according to the key generated by the first key generation module (109) to enable the optical signal to realize phase encryption, the output end of the first phase modulator (108) is connected with the transmission optical fiber (2);
the transmission fiber (2) is connected with the input end of a second optical amplifier (301), the output end of the second optical amplifier (301) is connected with the input end of a second polarization controller (302), the output end of the second polarization controller (302) is connected with the input end of a second phase modulator (303), the second polarization controller (302) adjusts the polarization direction of the optical signal to enable the polarization direction of the optical signal to meet the requirement of the second phase modulator (303), the output end of a second key generation module (304) is electrically connected with the driving end of the second phase modulator (303), the second phase modulator (303) carries out phase modulation on the optical signal according to a key generated by the second key generation module (304) to enable the optical signal to realize phase decryption, the output end of the second phase modulator (303) is connected with a first port of a second optical circulator (305), and a second dispersion component (306) is connected with a second port of the second optical circulator (305), the third port of the second optical circulator (305) is connected as an output to the photodetector (307).
7. The system of claim 6, wherein the keys generated by the first key generation module (109) and the second key generation module (304) have the same amplitude and opposite amplitudes; the first dispersion member (106) and the second dispersion member (306) have opposite dispersion values.
8. A physical layer secure communication system based on dispersion-phase encryption according to claim 7, characterized in that the keys generated by the first key generation module (109) and the second key generation module (304) are pseudo-random sequences.
9. A dispersion-phase encryption based physical layer secure communication system according to claim 7, characterized in that the first dispersion unit (106) and the second dispersion unit (306) each employ chirped fiber gratings.
10. A method for a physical layer secure communication based on dispersion-phase encryption applied to the physical layer secure communication system based on dispersion-phase encryption of any one of claims 1 to 9, comprising the steps of:
s1, generating an optical carrier for carrying data to be encrypted;
s2, modulating the data to be encrypted onto an optical carrier to generate an optical signal carrying the data to be encrypted;
s3, utilizing the first dispersion component (106) to distort the amplitude of the optical signal to realize time domain encryption;
s4, phase encryption is carried out on the optical signal after the time domain encryption by utilizing a first phase modulator (108) to obtain an encrypted optical signal;
s5, the sending end (1) sends the encrypted optical signal to the receiving end (3) through the transmission optical fiber (2);
s6, carrying out phase recovery on the encrypted optical signal by using a second phase modulator (303);
s7, the amplitude of the encrypted optical signal is restored by the second dispersion unit (306) to obtain a decrypted optical signal.
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