CN114244490B - Chaotic light secret communication system based on photoelectric filtering feedback enhanced key space - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
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- H—ELECTRICITY
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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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
- H04B10/60—Receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
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Abstract
The invention belongs to the technical field of secret communication, and discloses a chaotic light secret communication system based on photoelectric filtering feedback enhanced key space, which comprises the following steps: the super-radiation light-emitting diode, the first light-splitting element, the first optical isolator, the second optical isolator, the first adjustable attenuator, the second adjustable attenuator, the receiver and the transmitter, wherein the transmitter comprises a first semiconductor laser, a first photoelectric detector, a first adjustable band-pass filter module and a first gain adjustable amplifier, and the receiver comprises a second semiconductor laser, a second photoelectric detector, a second adjustable band-pass filter module and a second gain adjustable amplifier. The invention effectively increases the key space in chaotic secret communication, improves the safety of communication, and has better popularization and application values.
Description
Technical Field
The invention belongs to the technical field of secret communication, and particularly relates to a chaotic light secret communication system based on photoelectric filtering feedback enhanced key space.
Background
Today, communication users and communication data are greatly growing, and security of communication is receiving more and more attention. For this purpose, the transmitted information is encrypted effectively, so that the information is transmitted securely.
Chaotic optical secret communication has the advantages of hardware encryption, compatibility with the existing optical communication system, long-distance communication and the like, so that the chaotic optical secret communication is widely applied to secret communication. The premise of chaotic optical secure communication is that chaotic synchronization between a receiver and a transmitter is required, which requires that structural parameters of the receiver and the transmitter are completely matched or within a certain parameter mismatch range (Phys. Rev. E, vol. 69, P. 056226, 2004). For both parties of the legitimate communication, the structural and operational parameters of the transceiver are typically used as keys. The larger the key space that the key parameters make up, the more difficult it is for an eavesdropper to crack the information. Thus, chaotic secret communication requires an increase in the key space of the transceiver.
At present, research schemes for increasing key space are as follows: the key space is increased by pseudo-random code modulation feedback cavity length, and the cavity length or phase information of the external cavity feedback laser is modulated by a pre-set pseudo-random code sequence as a private key (IEEE photon. Technology. Lett., vol. 27, p.326-329, 2015). However, the security of the device depends on a private key rather than the physical parameters of the device, and the unique hardware encryption advantage of chaotic secret communication cannot be exerted; by embedding regulatable electro-optical devices in the feedback loop, the number of devices controlling the chaotic state is increased (opt. Express, vol. 24, P. 23439-23449, 2016).
Disclosure of Invention
The invention provides a chaotic light secret communication system for enhancing a secret key space based on photoelectric filtering feedback to improve the secret key space of the system in order to solve the problem that the existing chaotic secret communication is eavesdropped and cracked.
In order to solve the technical problems, the invention adopts the following technical scheme: a chaotic light secret communication system based on photoelectric filtering feedback enhanced key space, comprising: the super-radiation light-emitting diode, the first light-splitting element, the first optical isolator, the second optical isolator, the first adjustable attenuator, the second adjustable attenuator, the receiver and the transmitter, wherein the transmitter comprises a first semiconductor laser, a photoelectric detector, a first adjustable band-pass filter module and a first gain adjustable amplifier, and the receiver comprises a second semiconductor laser, a second photoelectric detector, a second adjustable band-pass filter module and a second gain adjustable amplifier;
the broadband optical signal emitted by the super-radiation light-emitting diode is divided into two paths by a first light-splitting element, one path of the broadband optical signal is injected into the first semiconductor laser by a first optical isolator and a first adjustable attenuator, and the other path of the broadband optical signal is injected into the second semiconductor laser by a second optical isolator and a second adjustable attenuator;
the chaotic light emitted by the first semiconductor laser is divided into three paths, one path is reflected back to the first semiconductor laser, the other path is detected by a first photoelectric detector and converted into a first electric signal, the first electric signal is filtered by a first adjustable band-pass filter module and amplified by a first gain adjustable amplifier and then is positively fed back to the bias current of the first semiconductor laser, and the third path is used as a chaotic carrier loading message and then is sent to a receiving end;
the chaotic light emitted by the second semiconductor laser is divided into three paths, one path of chaotic light is reflected back to the second semiconductor laser through a second reflector, the other path of chaotic light is detected through a second photoelectric detector and converted into a second electric signal, and the second electric signal is filtered through a second adjustable band-pass filter module and amplified by a second gain adjustable amplifier and then is positively fed back to the bias current of the second semiconductor laser; the third path serves as a demodulation carrier.
The parameter settings of the first semiconductor laser and the second semiconductor laser are the same; the first optical isolator and the second optical isolator are identical in parameter setting; the first adjustable attenuator and the second adjustable attenuator are identical in parameter setting; the parameter settings of the first photoelectric detector and the second photoelectric detector are the same; the parameters of the first adjustable band-pass filtering module and the second adjustable band-pass filtering module are set the same; the first and second gain adjustable amplifiers have the same parameter settings.
The chaotic light secret communication system based on photoelectric filtering feedback enhanced key space further comprises a second light splitting element, a first reflecting mirror, a fourth light splitting element, a third light splitting element, a second reflecting mirror and a fifth light splitting element;
the chaotic light emitted by the first semiconductor laser is divided into two paths through a first light splitting element, one path of the chaotic light is reflected by a first reflecting mirror and then returns to the laser, and the other path of the chaotic light is divided into two beams through a fourth light splitting element and respectively enters a first photoelectric detector and is used as a chaotic carrier;
the chaotic light emitted by the second semiconductor laser is split into two beams after passing through the third light splitting element, one beam returns to the laser after being reflected by the second reflecting mirror, and the other beam is split into two beams after passing through the fifth light splitting element, and the two beams are respectively incident to the second photoelectric detector and used as demodulation carrier waves.
The chaotic light secret communication system based on photoelectric filtering feedback enhanced key space further comprises a second light splitting element, a first reflecting mirror, a third light splitting element and a second reflecting mirror;
the chaotic light emitted by the first semiconductor laser is divided into three beams by the first light splitting element, one beam is reflected by the first reflecting mirror and then returns to the laser, and the other two beams are respectively incident to the first photoelectric detector and used as chaotic carrier waves;
the chaotic light emitted by the second semiconductor laser is divided into three beams by the third light splitting element, one beam is reflected by the second reflecting mirror and then returns to the laser, and the other two beams are respectively incident to the second photoelectric detector and used as demodulation carriers.
The chaotic optical secret communication system based on photoelectric filtering feedback enhanced key space further comprises an optical filter and an erbium-doped optical fiber amplifier; the broadband light signal emitted by the super-radiation light-emitting diode is incident into the first light-splitting element to be split into two paths after passing through the optical filter and the erbium-doped fiber amplifier.
The chaotic light secret communication system based on photoelectric filtering feedback enhanced key space further comprises a third photoelectric detector, a fourth photoelectric detector and a subtracter, wherein the third photoelectric detector is used for converting a chaotic carrier into an electric signal, the fourth photoelectric detector is used for converting a demodulation carrier into the electric signal, and the output ends of the third photoelectric detector and the fourth photoelectric detector are connected with the subtracter.
The first tunable bandpass filter module and the second tunable bandpass filter module include a plurality of tunable bandpass filters connected in parallel.
The chaotic light secret communication system based on photoelectric filtering feedback enhanced key space comprises the following steps:
s1, adjusting parameters of corresponding elements of a transmitter and a receiver to be consistent;
s2, the message m (t) is loaded onto a chaotic carrier output by a transmitter (Alice) in a chaotic hiding mode and is sent to a receiving end, the message m (t) +the chaotic carrier is obtained at the receiving end, and then the message m (t) is obtained by subtracting the chaotic carrier output by the synchronized legal receiver (Bob) per se.
The invention uses the broadband noise signal as the driving source, which has the characteristic of broadband, so that an eavesdropper can not completely observe the time domain change and then can not reconstruct the complete driving signal, thereby effectively enhancing the safety of communication. The transceiver module of the invention adopts a mode of combining photoelectric feedback and external optical feedback to generate chaotic light, so that the generated chaotic light has higher complexity, and simultaneously, the time delay characteristic of the photoelectric feedback loop is effectively restrained, and the time delay characteristic can be used as a safe physical key.
According to the invention, the tunable band-pass filter and the gain-tunable amplifier are introduced into the photoelectric feedback loop of the transceiver, the center frequency and bandwidth parameters of the filter, and the gain of the tunable amplifier can be used as a secret key of chaotic secret communication, so that the secret key space of the system is increased.
In addition, the invention loads the signal m (t) to be transmitted onto the chaotic carrier C (t) of the transmitter (Alice) in a chaotic hiding way. And obtaining m (t) +C (t) at the receiving end, subtracting the synchronous chaotic carrier C (t)' generated by the receiving module, and further obtaining a message m (t), thereby realizing unidirectional communication.
Compared with the existing chaotic secret communication scheme, the secret key space enhanced chaotic light secret communication method has the following beneficial effects:
1. the invention uses the broadband noise signal as the driving source, which has the characteristic of broadband, so that an eavesdropper can not completely observe the time domain change and then can not reconstruct the complete driving signal, thereby effectively enhancing the safety of communication.
2. The system can be used as a physical key with more parameters, has a large adjustable range and has small correlation of chaotic light signals generated by different parameters after adjustment. The main parameters include: the center frequency of the tunable bandpass filter, the bandwidth of the tunable bandpass filter, the gain of the amplifier, the feedback strength of the external optical feedback, and the time delay of the optical-to-electrical feedback loop.
In conclusion, the invention has reasonable design, effectively increases the key space in chaotic secret communication, improves the safety of communication, and has better popularization and application values.
Drawings
Fig. 1 is a schematic structural diagram of a chaotic light secret communication system based on photoelectric filtering feedback enhanced key space according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a chaotic light secret communication system based on photoelectric filtering feedback enhanced key space according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a tunable bandpass filter combination module according to a second embodiment of the invention;
in the figure: 1 is a super-radiation light-emitting diode; 2 is an optical filter; 3 is an erbium-doped fiber amplifier; 4 is a first spectroscopic element; 5a is a first optical isolator, 5b is a second optical isolator, 6a is a first adjustable attenuator, and 6b is a second adjustable attenuator; 7a is a first semiconductor laser, and 7b is a second semiconductor laser; 8a is a second spectroscopic element, and 8b is a third spectroscopic element; 9a is a first mirror and 9b is a second mirror; 10a is a fourth spectroscopic element, and 10b is a fifth spectroscopic element; 11a, 11b is a second photodetector; 12 is a tunable bandpass filter; 12a is a first tunable bandpass filter module, 12b is a second tunable bandpass filter module; 13a is a first gain adjustable amplifier and 13b is a second gain adjustable amplifier; 14a is a third photodetector and 14b is a fourth photodetector.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1, a first embodiment of the present invention provides a chaotic light secret communication system for enhancing a key space based on photoelectric filtering feedback, including: the super-radiation light-emitting diode 1, the first light-splitting element 4, the first optical isolator 5a, the second optical isolator 5b, the first adjustable attenuator 6a, the second adjustable attenuator 6b, a receiver and a transmitter, wherein the transmitter comprises a first semiconductor laser 7a, a second light-splitting element 8a, a first reflecting mirror 9a, a fourth light-splitting element 10a, a first photodetector 11a, a first adjustable band-pass filter module 12a and a first gain adjustable amplifier 13a, and the receiver comprises a second semiconductor laser 7b, a third light-splitting element 8b, a second reflecting mirror 9b, a fifth light-splitting element 10b, a second photodetector 11b, a second adjustable band-pass filter module 12b and a second gain adjustable amplifier 13b.
The broadband optical signal emitted by the super-radiation light-emitting diode 1 is divided into two paths by the first light-splitting element 4, one path of the broadband optical signal is injected into the first semiconductor laser 7a by the first optical isolator 5a and the first adjustable attenuator 6a, and the other path of the broadband optical signal is injected into the second semiconductor laser 7b by the second optical isolator 5b and the second adjustable attenuator 6 b.
The chaotic light emitted by the first semiconductor laser 7a is divided into two paths by the second light splitting element 8a, one path is reflected back to the first semiconductor laser 7a by the first reflecting mirror 9a, the other path is divided into two paths by the fourth light splitting element 10a, one path is detected by the first photoelectric detector 11a and converted into a first electric signal, the first electric signal is filtered by the first adjustable band-pass filter module 12a, amplified by the first gain adjustable amplifier 13a and positively fed back to the bias current of the first semiconductor laser 7a, and the other path is used as a chaotic carrier for loading signals.
The chaotic light emitted by the second semiconductor laser 7b is divided into two paths by the third light splitting element 8b, one path is reflected back to the second semiconductor laser 7b by the second reflecting mirror 9b, the other path is divided into two paths by the fifth light splitting element 10b, one path is detected by the second photodetector 11b and converted into a second electric signal, the second electric signal is filtered by the second adjustable band-pass filter module 12b and amplified by the second gain adjustable amplifier 13b and then is positively fed back to the bias current of the second semiconductor laser 7b, and the other path of chaotic light signal synchronous with the transmitter is used as a demodulation carrier wave for decoding information loaded by the transmitter.
Specifically, in the present embodiment, the parameter settings of the first semiconductor laser 7a and the second semiconductor laser 7b are the same; the first and second adjustable attenuators 6a and 6b have the same parameter settings; the second spectroscopic element 8a and the third spectroscopic element 8b have the same parameter settings, the fourth spectroscopic element 10a and the fifth spectroscopic element 10b have the same parameter settings, and the spectroscopic ratio is 50:50. The first partial mirror 9a and the second partial mirror 9b have the same parameter settings; the first photodetector 11a and the second photodetector 11b have the same parameter setting; the first tunable bandpass filter module 12a and the second tunable bandpass filter module 12b have the same parameter settings; the first and second gain adjustable amplifiers 13a, 13b are set to the same parameters.
Specifically, in the present embodiment, the first spectroscopic element 4, the second spectroscopic element 8a, the third spectroscopic element 8b, the fourth spectroscopic element 10a, and the fifth spectroscopic element 10b are 1×2 couplers. The spectral ratio was 50:50.
In this embodiment, the second light splitting element 8a, the first reflecting mirror 9a, and the fourth light splitting element 10a are configured to split the chaotic light emitted from the first semiconductor laser 7a into three beams, and return one of the three beams to the laser, and the other beam is incident on the first photodetector 11a, where the third beam is used as a chaotic carrier; the third light-splitting element 8b, the second reflecting mirror 9b, and the fifth light-splitting element 10b are configured to split the chaotic light emitted from the second semiconductor laser 7b into three beams, and return one of the three beams to the laser, and the other beam is incident on the second photodetector 11b, with the third beam serving as a demodulation carrier. As an alternative to the above-described embodiment, in this example, the first mirror 9a and the second mirror 9b may be partial mirrors, which feed back a part of the light emission back to the corresponding coupler and thus to the laser, and another part of the transmitted light may be used for loading the signal or for demodulating the signal. At this time, the system may omit the fourth and fifth spectroscopic elements 10a and 10b. In this embodiment, the second spectroscopic element 8a and the fourth spectroscopic element 10a may be 1×3 fiber couplers, and the laser beam may be directly split into three paths, and in this case, the fourth spectroscopic element 10a and the fifth spectroscopic element 10b may be omitted.
In this embodiment, the center frequency and bandwidth parameters of the first tunable bandpass filter module 12a and the second tunable bandpass filter module 12b are tunable, so that the center frequency and the band block parameters of the bandpass filter have a certain detunable range under the synchronization performance meeting the communication requirement. The different gain values of the gain tunable amplifiers 13a and 13b also further expand the parameter tuning range, further increasing the key space of the system.
Specifically, the communication method of the present embodiment includes the steps of:
s1, adjusting parameters of corresponding elements of a transmitter and a receiver to be consistent, and enabling the transmitting and receiving ends to achieve a high-quality synchronous state through driving synchronization, namely generating almost the same chaotic carrier;
s2, the message m (t) is loaded onto a chaotic carrier wave output by a transmitter (Alice) in a chaotic hiding way, and is transmitted to a receiving end (Bob) through a public link, a signal I1=message m (t) +the chaotic carrier wave obtained by photoelectric conversion of a third photoelectric detector 14a at the receiving end, in addition, a demodulation carrier signal output by the receiving end is identical to the chaotic carrier signal, and a signal obtained by photoelectric conversion of a fourth photoelectric detector 14b is: i2 The signals of the third and fourth photodetectors 14a and 14b are subtracted by a subtractor, i.e., decoded, to obtain a message m (t) =chaotic carrier.
Example two
As shown in fig. 2, a second embodiment of the present invention provides a system for enhancing a chaotic light secret communication key space based on photoelectric filtering feedback, and its specific structure is basically the same as that of the first embodiment. Unlike the first embodiment, the present embodiment further includes an optical filter 2 and an erbium-doped fiber amplifier 3; the broadband optical signal emitted by the super-radiation light-emitting diode 1 is incident into the first light-splitting element 4 to be split into two paths after passing through the optical filter 2 and the erbium-doped optical fiber amplifier 3; one path is injected into the first semiconductor laser 7a after passing through the first optical isolator 5a and the first adjustable attenuator 6a, and the other path is injected into the second semiconductor laser 7b after passing through the second optical isolator 5b and the second adjustable attenuator 6 b.
Specifically, in the present embodiment, the first optical isolator 5a and the second optical isolator 5b are set to the same parameter.
Further, as shown in fig. 3, in the present embodiment, the first tunable bandpass filter module 12a and the second tunable bandpass filter module 12b include a plurality of tunable bandpass filters 12 connected in parallel. The center frequency and the bandwidth parameters of the filter are adjusted, so that the center frequency and the band block parameters of the band-pass filter have a certain detunable range under the synchronous performance meeting the communication requirement. The gain values of the tunable amplifiers with different gains also further expand the parameter adjustable range, thereby greatly expanding the safety key space of the system. In addition, the plurality of tunable bandpass filters 12 are connected in parallel, so that the physical key space formed by the center frequency and the bandwidth of the individual filters increases exponentially as the number of filters increases.
In summary, the invention provides a system for enhancing the chaotic light secret communication key space based on photoelectric filtering feedback, which uses a broadband noise signal as a driving source, and has the characteristic of broadband, so that an eavesdropper cannot completely observe the time domain change and further cannot reconstruct the complete driving signal, and the safety of communication is effectively enhanced. The system can be used as a physical key with more parameters and a large adjustable range. The main parameters include: the center frequency of each filter of the adjustable band-pass filter module, the bandwidth of each filter of the adjustable band-pass filter module, the gain of the amplifier, the feedback intensity of external optical feedback and the time delay of the photoelectric feedback loop. The invention adopts the adjustable band-pass filtering module, so that the physical key space formed by the central frequency and the bandwidth of a single filter of the adjustable band-pass filtering module grows exponentially along with the increase of the number of the filters. The system has high safety and can effectively resist direct filtering attack and driving chaos attack. The invention has reasonable design, effectively increases the key space in chaotic secret communication, improves the safety of communication, and has better popularization and application values.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. A chaotic light secret communication system based on photoelectric filtering feedback enhanced key space, comprising: the super-radiation light-emitting diode (1), a first light-splitting element (4), a first optical isolator (5 a), a second optical isolator (5 b), a first adjustable attenuator (6 a), a second adjustable attenuator (6 b), a receiver and a transmitter, wherein the transmitter comprises a first semiconductor laser (7 a), a first photoelectric detector (11 a), a first adjustable band-pass filter module (12 a) and a first gain adjustable amplifier (13 a), and the receiver comprises a second semiconductor laser (7 b), a second photoelectric detector (11 b), a second adjustable band-pass filter module (12 b) and a second gain adjustable amplifier (13 b);
the broadband optical signal emitted by the super-radiation light-emitting diode (1) is divided into two paths by a first light-splitting element (4), one path is injected into the first semiconductor laser (7 a) by a first optical isolator (5 a) and a first adjustable attenuator (6 a), and the other path is injected into the second semiconductor laser (7 b) by a second optical isolator (5 b) and a second adjustable attenuator (6 b);
the chaotic light emitted by the first semiconductor laser (7 a) is divided into three paths, one path is reflected back to the first semiconductor laser (7 a), the other path is detected by the first photoelectric detector (11 a) and converted into a first electric signal, the first electric signal is filtered by the first adjustable band-pass filter module (12 a), amplified by the first gain adjustable amplifier (13 a) and then positively fed back to the bias current of the first semiconductor laser (7 a), and the third path is used as a chaotic carrier loading message and then sent to a receiving end;
the chaotic light emitted by the second semiconductor laser (7 b) is divided into three paths, one path of the chaotic light is reflected back to the second semiconductor laser (7 b), the other path of the chaotic light is detected by a second photoelectric detector (11 b) and is converted into a second electric signal, and the second electric signal is filtered by a second adjustable band-pass filter module (12 b) and amplified by a second gain adjustable amplifier (13 b) and then is positively fed back to the bias current of the second semiconductor laser (7 b); the third path serves as a demodulation carrier.
2. A chaotic light secret communication system based on optical-electrical filtering feedback enhanced key space according to claim 1, wherein the parameter settings of the first semiconductor laser (7 a) and the second semiconductor laser (7 b) are identical; the first optical isolator (5 a) and the second optical isolator (5 b) have the same parameter setting; the first adjustable attenuator (6 a) and the second adjustable attenuator (6 b) have the same parameter setting; the parameter settings of the first photoelectric detector (11 a) and the second photoelectric detector (11 b) are the same; the first adjustable band-pass filter module (12 a) and the second adjustable band-pass filter module (12 b) have the same parameter setting; the first gain adjustable amplifier (13 a) and the second gain adjustable amplifier (13 b) have the same parameter settings.
3. The chaotic light secret communication system based on the photoelectric filtering feedback enhanced key space according to claim 1, further comprising a second light splitting element (8 a), a first reflecting mirror (9 a), a fourth light splitting element (10 a), a third light splitting element (8 b), a second reflecting mirror (9 b) and a fifth light splitting element (10 b);
the chaotic light emitted by the first semiconductor laser (7 a) is divided into two paths through the first light splitting element (4), one path of the chaotic light is reflected by the first reflecting mirror (9 a) and then returns to the laser, and the other path of the chaotic light is divided into two beams through the fourth light splitting element (10 a) and respectively enters the first photoelectric detector (11 a) and is used as a chaotic carrier wave;
the chaotic light emitted by the second semiconductor laser (7 b) is divided into two beams by a third light splitting element (8 b), one beam is reflected by a second reflecting mirror (9 b) and then returns to the laser, and the other beam is divided into two beams by a fifth light splitting element (10 b) and respectively enters a second photoelectric detector (11 b) and is used as a demodulation carrier wave.
4. The chaotic light secret communication system based on the photoelectric filtering feedback enhanced key space according to claim 1, further comprising a second light splitting element (8 a), a first reflecting mirror (9 a), a third light splitting element (8 b) and a second reflecting mirror (9 b);
the chaotic light emitted by the first semiconductor laser (7 a) is divided into three beams by the first light splitting element (4), one beam is reflected by the first reflecting mirror (9 a) and then returns to the laser, and the other two beams are respectively incident to the first photoelectric detector (11 a) and used as chaotic carrier waves;
chaotic light emitted by the second semiconductor laser (7 b) is divided into three beams by the third light splitting element (8 b), one beam is reflected by the second reflecting mirror (9 b) and then returns to the laser, and the other two beams are respectively incident to the second photoelectric detector (11 b) and used as demodulation carriers.
5. The chaotic light secret communication system based on the photoelectric filtering feedback enhanced key space according to claim 1, further comprising an optical filter (2) and an erbium-doped fiber amplifier (3); the broadband light signal emitted by the super-radiation light-emitting diode (1) is incident into the first light-splitting element (4) to be split into two paths after passing through the optical filter (2) and the erbium-doped fiber amplifier (3).
6. The chaotic light secret communication system based on the photoelectric filtering feedback enhanced key space according to claim 1, further comprising a third photoelectric detector (14 a), a fourth photoelectric detector (14 b) and a subtracter, wherein the third photoelectric detector (14 a) is used for converting a chaotic carrier into an electric signal, the fourth photoelectric detector (14 b) is used for converting a demodulation carrier into the electric signal, and output ends of the third photoelectric detector (14 a) and the fourth photoelectric detector (14 b) are connected with the subtracter.
7. The chaotic light secret communication system based on the optical-electrical filtering feedback enhanced key space according to claim 1, wherein the first tunable bandpass filtering module (12 a) and the second tunable bandpass filtering module (12 b) comprise a plurality of tunable bandpass filters (12) connected in parallel.
8. The chaotic light secret communication system based on the photoelectric filtering feedback enhanced key space according to claim 1, wherein the communication method comprises the following steps:
s1, adjusting parameters of corresponding elements of a transmitter and a receiver to be consistent;
s2, the message m (t) is loaded onto a chaotic carrier output by a transmitter (Alice) in a chaotic hiding mode and is sent to a receiving end, the message m (t) +the chaotic carrier is obtained at the receiving end, and then the message m (t) is obtained by subtracting the chaotic carrier output by the synchronized legal receiver (Bob) per se.
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| CN111147145A (en) * | 2019-12-06 | 2020-05-12 | 太原理工大学 | Large-key space chaotic optical communication transceiver |
| CN111147234A (en) * | 2019-12-06 | 2020-05-12 | 太原理工大学 | High-speed physical key distribution system and method based on multi-mode laser chaotic synchronization |
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