CN112202500A - Signal transmitting device, signal receiving device and chaotic encryption optical communication system - Google Patents
Signal transmitting device, signal receiving device and chaotic encryption optical communication system Download PDFInfo
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- CN112202500A CN112202500A CN202011005524.1A CN202011005524A CN112202500A CN 112202500 A CN112202500 A CN 112202500A CN 202011005524 A CN202011005524 A CN 202011005524A CN 112202500 A CN112202500 A CN 112202500A
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/504—Laser transmitters using direct modulation
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
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Abstract
The embodiment of the application discloses a signal sending device, a signal receiving device, a chaotic encryption optical communication system and a signal transmission method, wherein the signal sending device comprises: the device comprises a first chaotic laser and a modulator, wherein the emergent end of the first chaotic laser is connected with the incident end of the modulator; the first chaotic laser is used for generating a chaotic signal and modulating the chaotic signal by adopting a modulation signal to obtain a modulated chaotic signal; the modulator is used for modulating the modulation chaotic signal by adopting target information and sending the modulation chaotic signal carrying the target information.
Description
Technical Field
The present application relates to the field of optical communication technologies, and in particular, to a signal transmitting device, a signal receiving device, a chaotic encryption optical communication system, and a signal transmission method.
Background
As the demand of social development on information quantity is increased sharply, the importance of information security is remarkably improved, the privacy is increased to be national confidentiality, and the information security plays a very important role. Secure communications are therefore also receiving a great deal of attention from all societies.
At present, the traditional secret communication technology mainly comprises a chaotic encryption communication technology and a quantum encryption communication technology. Different from computer algorithm encryption, the two technologies adopt a pure physical encryption mode, so that the information security is improved. However, quantum encryption communication is currently in the beginning stage, and a distance is still provided from commercial long-distance communication. Because chaos has the characteristics of ergodicity, internal randomness, sensitivity to initial values, difficulty in long-term prediction and the like, chaos encryption communication based on a physical layer has become a focus of research in related fields. At present, the achievements of people in the aspect of electric chaos encryption communication are rich, and a plurality of encryption communication schemes based on electric chaos are provided. However, the electronic circuit system with the electricity chaos has the natural electronic bottleneck limit, and the signal rate cannot be very high; in addition, the transmission of electronic signals is often accompanied by high attenuation, which results in a great limitation of application in the field of high-speed, remote, encrypted communications. The laser chaotic system based on the laser has the advantages of an electrical chaotic system, ensures high bandwidth, can be well compatible with the conventional optical fiber system to realize low loss in the propagation process, and is very suitable for long-distance encrypted communication. Therefore, the encrypted communication based on the laser chaos is receiving much attention from many scientists at home and abroad.
However, the security of information in chaotic encrypted communication is still weak, and information is easily broken by a thief, so that there is a need to improve the security of chaotic encrypted communication.
Disclosure of Invention
In view of the above, embodiments of the present application provide a signal transmitting apparatus, a signal receiving apparatus, a chaotic encryption optical communication system and a signal transmission method to solve at least one problem in the prior art.
In order to achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a signal sending apparatus, including: the device comprises a first chaotic laser and a modulator, wherein the emergent end of the first chaotic laser is connected with the incident end of the modulator; wherein the content of the first and second substances,
the first chaotic laser is used for generating a chaotic signal and modulating the chaotic signal by adopting a modulation signal to obtain a modulated chaotic signal;
the modulator is used for modulating the modulation chaotic signal by adopting target information and sending the modulation chaotic signal carrying the target information.
In an optional embodiment, the first chaotic laser is specifically configured to modulate at least one of a laser intensity, a phase and a frequency of the chaotic signal with the modulation signal.
In an alternative embodiment, the modulator is an electro-absorption modulator.
In a second aspect, an embodiment of the present application provides a signal receiving apparatus, including: the device comprises a first detector, a second chaotic laser, a second detector and a subtracter, wherein the emergent end of the first detector is connected with the incident end of the subtracter, the emergent end of the second chaotic laser is connected with the incident end of the second detector, and the emergent end of the second detector is connected with the incident end of the subtracter; wherein the content of the first and second substances,
the first detector is used for receiving the modulated chaotic signal carrying the target information, converting the modulated chaotic signal carrying the target information into a first electric signal and sending the first electric signal to the subtracter;
the second chaotic laser is used for generating a chaotic signal, modulating the chaotic signal by adopting a modulation signal to obtain a modulated chaotic signal, and sending the modulated chaotic signal to the second detector;
the second detector is used for converting the modulated chaotic signal into a second electric signal and sending the second electric signal to the subtracter;
the subtracter is used for subtracting the second electric signal from the first electric signal to obtain the target information.
In an optional implementation manner, the second chaotic laser is specifically configured to determine whether the second chaotic laser and the first chaotic laser are synchronized through a common channel between the second chaotic laser and the first chaotic laser;
and under the condition of judging that the second chaotic laser and the first chaotic laser are synchronous, sending the obtained modulated chaotic signal to the first detector.
In an alternative embodiment, the center wavelengths of the chaotic signals generated by the second chaotic laser and the first chaotic laser are the same.
In a third aspect, an embodiment of the present application provides a chaotic encryption optical communication system, which includes the signal transmitting apparatus of the first aspect, a transmission optical fiber, and the signal receiving apparatus of the second aspect; the emergent end of a modulator in the signal sending device is connected with the incident end of the transmission optical fiber, and the emergent end of the transmission optical fiber is connected with the incident ends of a first detector and a second chaotic laser in the signal receiving device; wherein the content of the first and second substances,
the signal transmitting device is used for transmitting the modulated chaotic signal carrying the target information to the signal receiving device through the transmission optical fiber;
the signal receiving device is used for receiving the modulated chaotic signal which is sent by the signal sending device and carries the target information through the transmission optical fiber.
In a fourth aspect, an embodiment of the present application provides a signal transmission method, where the method includes:
generating a chaotic signal, and modulating the chaotic signal by adopting a modulation signal to obtain a modulated chaotic signal;
and modulating the modulated chaotic signal by adopting target information, and sending the modulated chaotic signal carrying the target information.
In an optional embodiment, the modulating the chaotic signal with a modulation signal includes:
and modulating at least one of the laser intensity, the phase and the frequency of the chaotic signal by adopting the modulation signal.
In a fifth aspect, an embodiment of the present application provides a signal transmission method, where the method includes:
receiving a modulated chaotic signal carrying target information, and converting the modulated chaotic signal carrying the target information into a first electric signal;
generating a chaotic signal, and modulating the chaotic signal by adopting a modulation signal to obtain a modulated chaotic signal;
converting the modulated chaotic signal into a second electrical signal;
and subtracting the second electric signal from the first electric signal to obtain the target information.
According to the technical scheme of the embodiment of the application, the chaotic encryption optical communication system comprises a signal sending device, a transmission optical fiber and a signal receiving device, wherein the signal sending device comprises: the device comprises a first chaotic laser and a modulator, wherein the first chaotic laser generates chaotic signals, the chaotic signals are modulated by adopting modulation signals to obtain modulation chaotic signals, and the modulator modulates the modulation chaotic signals by adopting target information to complete the encryption of the target information. The signal sending device sends the modulated chaotic signal carrying the target information to the signal receiving device through the transmission optical fiber. The signal receiving device comprises a first detector, a second chaotic laser, a second detector and a subtracter, wherein the first detector converts a modulated chaotic signal carrying target information into a first electric signal after receiving the modulated chaotic signal carrying the target information; sending the first electrical signal to the subtractor; the second chaotic laser generates a chaotic signal, modulates the chaotic signal by adopting a modulation signal to obtain a modulated chaotic signal, and sends the modulated chaotic signal to the second detector; the second detector converts the modulated chaotic signal into a second electric signal and sends the second electric signal to the subtracter; the subtracter subtracts the second electric signal from the first electric signal to obtain the target information, so that decryption of the target information is completed. According to the technical scheme, the chaotic signal is modulated through the modulation signal to obtain the modulated chaotic signal, and then the modulated chaotic signal is used as a carrier to hide the target signal in the modulated chaotic signal, so that the confidentiality of information transmission is further improved.
Drawings
Fig. 1 is a schematic structural diagram of a signal transmitting apparatus according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a signal receiving apparatus according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a chaotic encryption optical communication system according to an embodiment of the present application;
fig. 4 is a schematic flowchart of a signal transmission method according to an embodiment of the present application;
fig. 5 is a flowchart illustrating a signal transmission method according to an embodiment of the present application.
Detailed Description
Exemplary embodiments disclosed in the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the specific embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present application. It will be apparent, however, to one skilled in the art, that the present application may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present application; that is, not all features of an actual embodiment are described herein, and well-known functions and structures are not described in detail.
In the drawings, the size of layers, regions, elements, and relative sizes may be exaggerated for clarity. Like reference numerals refer to like elements throughout.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
Fig. 1 is a schematic structural diagram of a signal transmitting apparatus according to an embodiment of the present application, and as shown in fig. 1, the signal transmitting apparatus 100 includes: the optical fiber laser comprises a first chaotic laser 110 and a modulator 120, wherein the emergent end of the first chaotic laser 110 is connected with the incident end of the modulator 120; wherein the content of the first and second substances,
the first chaotic laser 110 is configured to generate a chaotic signal and modulate the chaotic signal with a modulation signal to obtain a modulated chaotic signal;
the modulator 120 is configured to modulate the modulated chaotic signal with target information, and send the modulated chaotic signal carrying the target information.
In this embodiment, the first chaotic laser 110 is specifically configured to modulate at least one of a laser intensity, a phase and a frequency of the chaotic signal with the modulation signal. Here, the first chaotic Laser may be a Distributed Feedback (DFB) Laser. In practical application, the first chaotic laser may comprise a transflective mirror and a distributed feedback laser.
In the embodiment of the present application, the modulator 120 hides the target information in the modulated chaotic signal. Therefore, the confidentiality of the chaotic encryption optical communication system is improved. Wherein the modulator is an electro-absorption modulator. The electro-absorption modulator is an optical signal modulation device based on the absorption effect of a semiconductor material, which is easy to integrate, and whose driving voltage is low and modulation rate is high.
In the embodiment of the application, the chaotic signal is modulated through the modulation signal to obtain the modulated chaotic signal, and then the modulated chaotic signal is used as a carrier to hide the target signal in the modulated chaotic signal, so that the confidentiality of information transmission is further improved. The chaotic laser and the modulator can form a core module of a signal transmitting end in an optical communication system, and the combination of the chaotic laser and the modulator can be directly used for chaotic encryption and can be combined with other optical communication systems for optical communication, so that the manufacturing cost can be reduced, and the utilization rate of the signal transmitting device provided by the embodiment of the application is improved.
Fig. 2 is a schematic structural diagram of a signal receiving apparatus according to an embodiment of the present application, and as shown in fig. 2, the signal receiving apparatus 200 includes: the detector comprises a first detector 210, a second chaotic laser 220, a second detector 230 and a subtracter 240, wherein the emergent end of the first detector 210 is connected with the incident end of the subtracter 240, the emergent end of the second chaotic laser 220 is connected with the incident end of the second detector 230, and the emergent end of the second detector 230 is connected with the incident end of the subtracter 240; wherein the content of the first and second substances,
the first detector 210 is configured to receive the modulated chaotic signal carrying the target information, convert the modulated chaotic signal carrying the target information into a first electrical signal, and send the first electrical signal to the subtractor 240;
the second chaotic laser 220 is configured to generate a chaotic signal, modulate the chaotic signal with a modulation signal to obtain a modulated chaotic signal, and send the modulated chaotic signal to the second detector 230;
the second detector 230 is configured to convert the modulated chaotic signal into a second electrical signal, and send the second electrical signal to the subtractor 240;
the subtractor 240 is configured to subtract the second electrical signal from the first electrical signal to obtain the target information.
In the embodiment of the present application, the signal of the modulated chaotic signal carrying the target information is sent to the second chaotic laser 220 to perform an injection locking function, so that the state of the second chaotic laser 220 is the same as that of the first chaotic laser, and the synchronization between the second chaotic laser 220 and the first chaotic laser is enhanced.
In the embodiment of the present application, the first Detector 210 and the second Detector 230 are both Photo Detectors (PDs).
Here, the chaotic signal, the modulated chaotic signal and the modulated chaotic signal carrying the target information are all optical signals, and the modulated chaotic signal carrying the target information is converted into a first electrical signal, that is, the modulated chaotic optical signal carrying the target information is converted into a modulated chaotic electrical signal carrying the target information; and converting the modulated chaotic signal into a second electrical signal, namely converting the modulated chaotic optical signal into a modulated chaotic electrical signal. The subtractor 240 subtracts the modulated chaotic electric signal from the modulated chaotic electric signal carrying the target information to obtain the target information. The target information is an electric signal, and the target information output by the signal receiving device is also an electric signal, so that the target information does not need to be subjected to photoelectric conversion.
In this embodiment of the application, the signal receiving device receives the modulated chaotic signal carrying the target information sent by the signal sending device, and demodulates and decrypts the modulated chaotic signal carrying the target information to obtain the target information hidden in the modulated chaotic signal carrying the target information. In addition, in the embodiment of the application, the optical signal transmitted in the encrypted optical communication is further converted into the electrical signal for decryption, and the electrical signal has higher stability than the optical signal, so that the optical signal is converted into the electrical signal before decryption, the accuracy of decryption is ensured, and the interference is reduced.
In this embodiment, the second chaotic laser 220 is specifically configured to determine whether the second chaotic laser 220 is synchronized with the first chaotic laser through a common channel between the second chaotic laser 220 and the first chaotic laser;
under the condition that the synchronization between the second chaotic laser 220 and the first chaotic laser is determined, the obtained modulated chaotic signal is sent to the second detector 230.
Here, the second chaotic laser may be a distributed feedback laser. In practical application, the second chaotic laser may comprise a transflective mirror and a distributed feedback laser.
In this embodiment of the application, the method for determining whether the second chaotic laser 220 and the first chaotic laser are synchronized may be that a spectrometer measures a center wavelength of a signal transmitted on a common channel between the second chaotic laser 220 and the first chaotic laser, and when the center wavelengths of the chaotic signals output by the first chaotic laser and the second chaotic laser 220 are the same, it is indicated that the second chaotic laser 220 and the first chaotic laser achieve chaotic synchronization. Then, at this time, the signal output by the second chaotic laser 220 may be used as a chaotic signal, and a modulation signal is used to modulate the chaotic signal to obtain a modulated chaotic signal, so that the subtractor 240 may subtract the chaotic electric signal carrying the target information output by the first detector 210 from the modulated chaotic electric signal output by the second detector 230 to obtain the electric signal of the target information.
In this embodiment of the application, the method for determining whether the second chaotic laser 220 is synchronized with the first chaotic laser may further be that, in the process of signal transmission between the second chaotic laser 220 and the first chaotic laser, a time sequence signal of the same time period is simultaneously taken for the second chaotic laser 220 and the first chaotic laser, and the time sequence signals of the second chaotic laser 220 and the first chaotic laser are subjected to cross-correlation calculation. And when the calculated cross-correlation coefficient reaches over 0.95, determining that the second chaotic laser 220 and the first chaotic laser achieve chaotic synchronization.
Fig. 3 is a schematic structural diagram of a chaotic encryption optical communication system according to an embodiment of the present application, and as shown in fig. 3, the chaotic encryption optical communication system includes: a signal transmitting device, a transmission fiber 320, and a signal receiving device; the outgoing end of the modulator 311 in the signal transmitting device is connected with the incoming end of the transmission fiber 320, and the outgoing end of the transmission fiber 320 is connected with the incoming ends of the first detector 331 and the second chaotic laser 332 in the signal receiving device; wherein the content of the first and second substances,
the signal sending device is configured to send the modulated chaotic signal carrying the target information to the signal receiving device through the transmission optical fiber 320;
the signal receiving device is configured to receive the modulated chaotic signal carrying the target information sent by the signal sending device through the transmission optical fiber 320.
In this embodiment, the signal transmitting apparatus further includes a first chaotic laser 312, where the first chaotic laser 312 is configured to generate a chaotic signal and modulate the chaotic signal with a modulation signal to obtain a modulated chaotic signal.
In the embodiment of the present application, the signal receiving apparatus further includes a second detector 333 and a subtractor 334, an exit end of the first detector 331 is connected to an incident end of the subtractor 334, an exit end of the second chaotic laser 332 is connected to an incident end of the second detector 333, and an exit end of the second detector 333 is connected to an incident end of the subtractor 334; wherein the content of the first and second substances,
the first detector 331 is configured to receive the modulated chaotic signal carrying the target information, convert the modulated chaotic signal carrying the target information into a first electrical signal, and send the first electrical signal to the subtractor 334;
the second chaotic laser 332 is configured to generate a chaotic signal, modulate the chaotic signal with a modulation signal to obtain a modulated chaotic signal, and send the modulated chaotic signal to the second detector 333;
the second detector 333 is configured to convert the modulated chaotic signal into a second electrical signal, and send the second electrical signal to the subtractor 334;
the subtractor 334 is configured to subtract the second electrical signal from the first electrical signal to obtain the target information.
In the embodiment of the present application, it is required to ensure that the first chaotic laser 312 and the second chaotic laser 332 have similar internal parameters, so that chaotic signals sent by the first chaotic laser 312 and the second chaotic laser 332 are consistent, and the chaotic encryption optical communication system reaches a good symmetric state, at this time, isochronous chaotic synchronization in which the time delay of the first chaotic laser 312 and the time delay of the second chaotic laser 332 are zero can be achieved, so that the first chaotic laser 312 and the second chaotic laser 332 generate chaotic signals that are synchronized with each other and can be used as chaotic carrier signals of encrypted communication. And respectively using the synchronized chaotic signal for encryption and decryption of the signal to realize encrypted transmission.
The following describes in detail the chaotic encryption optical communication process in the embodiment of the present application with reference to fig. 3:
modulating at least one of the laser intensity, the phase and the frequency of the chaotic signal generated by the first chaotic laser 312 by using the modulation signal to obtain a modulated chaotic signal, sending the modulated chaotic signal to the modulator 311, modulating the modulated chaotic signal by using target information by using the modulator 311 to obtain a modulated chaotic signal carrying target information, sending the modulated chaotic signal carrying the target information to the first detector 331 through the transmission optical fiber 320, receiving the modulated chaotic signal carrying the target information by the first detector 331, converting the modulated chaotic signal carrying the target information into a first electric signal, and sending the first electric signal to the subtractor 334; the second chaotic laser 332 generates a chaotic signal, modulates the chaotic signal by using a modulation signal to obtain a modulated chaotic signal, and sends the modulated chaotic signal to the second detector 333; the second detector 333 converts the modulated chaotic signal into a second electrical signal, and sends the second electrical signal to the subtractor 334; the subtractor 334 subtracts the second electrical signal from the first electrical signal to obtain the target information. Therefore, the whole process of encrypting and decrypting the target information is realized.
An embodiment of the present application further provides a signal transmission method, and fig. 4 is a schematic flow chart of the signal transmission method provided in the embodiment of the present application, where the method mainly includes the following steps:
In the embodiment of the application, a first chaotic laser in a signal transmitting device generates a chaotic signal, at least one of laser intensity, phase and frequency of the chaotic signal is modulated by adopting a modulation signal to obtain a modulation chaotic signal, and the modulation chaotic signal is transmitted to a modulator in the signal transmitting device.
In the embodiment of the application, a modulator in a signal sending device modulates the modulated chaotic signal by adopting target information to obtain a modulated chaotic signal carrying the target information, and sends the modulated chaotic signal carrying the target information. Wherein the modulator is an electro-absorption modulator.
An embodiment of the present application further provides a signal transmission method, and fig. 5 is a schematic flow chart of the signal transmission method provided in the embodiment of the present application, where the method mainly includes the following steps:
In the embodiment of the application, a first detector in a signal receiving device receives a modulated chaotic signal carrying target information, converts the modulated chaotic signal carrying the target information into a first electric signal, and sends the first electric signal to a subtractor in the signal receiving device. Here, the modulated chaotic signals carrying the target information are all optical signals, and the first electrical signal is a modulated chaotic electrical signal carrying the target information.
In the embodiment of the application, a second chaotic laser in a signal receiving device generates a chaotic signal, a modulation signal is adopted to modulate the chaotic signal to obtain a modulation chaotic signal, and the modulation chaotic signal is sent to a second detector in the signal receiving device.
In the embodiment of the present application, a second detector in the signal receiving apparatus converts the modulated chaotic signal into a second electrical signal, and sends the second electrical signal to a subtractor in the signal receiving apparatus. Here, the modulated chaotic signal is an optical signal, and the second electrical signal is a modulated chaotic electrical signal.
And step 504, subtracting the second electric signal from the first electric signal to obtain the target information.
In this embodiment, a subtractor in the signal receiving apparatus subtracts the second electrical signal from the first electrical signal to obtain the target information. Here. The subtractor in the signal receiving device specifically subtracts the modulated chaotic electric signal from the modulated chaotic electric signal carrying the target information to obtain the electric signal of the target information. It should be noted that, in practical application, the target information is an electrical signal, and the target information output by the signal receiving device is also an electrical signal, so that the target information does not need to be subjected to photoelectric conversion.
In the embodiment of the application, whether the second chaotic laser and the first chaotic laser are synchronous or not is judged through a common channel between the second chaotic laser in the signal receiving device and the first chaotic laser in the signal sending device; and under the condition of judging that the second chaotic laser and the first chaotic laser are synchronous, sending the generated chaotic signal to a second detector in a signal receiving device.
In the embodiment of the application, it is required to ensure that the first chaotic laser and the second chaotic laser have similar internal parameters, so that chaotic signals sent by the first chaotic laser and the second chaotic laser are consistent, the chaotic encryption optical communication system reaches a good symmetrical state, and isochronous chaotic synchronization with zero time delay of the first chaotic laser and the second chaotic laser can be realized at the moment. And respectively using the synchronized chaotic signal for encryption and decryption of the signal to realize encrypted transmission. In the embodiment of the application, the chaotic signal is further modulated by adopting the modulation signal to obtain the modulation chaotic signal, and the modulation chaotic signal is taken as a carrier to hide the target signal in the modulation chaotic signal, so that the confidentiality of encrypted communication is further improved.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The methods disclosed in the several method embodiments provided in the present application may be combined arbitrarily without conflict to obtain new method embodiments.
Features disclosed in several of the product embodiments provided in the present application may be combined in any combination to yield new product embodiments without conflict.
The features disclosed in the several method or apparatus embodiments provided in the present application may be combined arbitrarily, without conflict, to arrive at new method embodiments or apparatus embodiments.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A signal transmission device, comprising: the device comprises a first chaotic laser and a modulator, wherein the emergent end of the first chaotic laser is connected with the incident end of the modulator; wherein the content of the first and second substances,
the first chaotic laser is used for generating a chaotic signal and modulating the chaotic signal by adopting a modulation signal to obtain a modulated chaotic signal;
the modulator is used for modulating the modulation chaotic signal by adopting target information and sending the modulation chaotic signal carrying the target information.
2. The apparatus of claim 1, wherein the first chaotic laser is specifically configured to modulate at least one of a laser intensity, a phase and a frequency of the chaotic signal with the modulation signal.
3. The apparatus of claim 1 or 2, wherein the modulator is an electro-absorption modulator.
4. A signal receiving apparatus, comprising: the device comprises a first detector, a second chaotic laser, a second detector and a subtracter, wherein the emergent end of the first detector is connected with the incident end of the subtracter, the emergent end of the second chaotic laser is connected with the incident end of the second detector, and the emergent end of the second detector is connected with the incident end of the subtracter; wherein the content of the first and second substances,
the first detector is used for receiving the modulated chaotic signal carrying the target information, converting the modulated chaotic signal carrying the target information into a first electric signal and sending the first electric signal to the subtracter;
the second chaotic laser is used for generating a chaotic signal, modulating the chaotic signal by adopting a modulation signal to obtain a modulated chaotic signal, and sending the modulated chaotic signal to the second detector;
the second detector is used for converting the modulated chaotic signal into a second electric signal and sending the second electric signal to the subtracter;
the subtracter is used for subtracting the second electric signal from the first electric signal to obtain the target information.
5. The apparatus of claim 4, wherein the second chaotic laser is specifically configured to determine whether the second chaotic laser and the first chaotic laser are synchronized via a common channel therebetween;
and under the condition of judging that the second chaotic laser and the first chaotic laser are synchronous, sending the obtained modulated chaotic signal to the second detector.
6. The apparatus of claim 4 or 5, wherein the chaotic signals generated by the second chaotic laser and the first chaotic laser have the same center wavelength.
7. A chaotic encryption optical communication system, comprising the signal transmission apparatus according to any one of claims 1 to 3, a transmission optical fiber, and the signal reception apparatus according to any one of claims 4 to 6; the emergent end of a modulator in the signal sending device is connected with the incident end of the transmission optical fiber, and the emergent end of the transmission optical fiber is connected with the incident ends of a first detector and a second chaotic laser in the signal receiving device; wherein the content of the first and second substances,
the signal transmitting device is used for transmitting the modulated chaotic signal carrying the target information to the signal receiving device through the transmission optical fiber;
the signal receiving device is used for receiving the modulated chaotic signal which is sent by the signal sending device and carries the target information through the transmission optical fiber.
8. A method of signal transmission, the method comprising:
generating a chaotic signal, and modulating the chaotic signal by adopting a modulation signal to obtain a modulated chaotic signal;
and modulating the modulated chaotic signal by adopting target information, and sending the modulated chaotic signal carrying the target information.
9. The method of claim 8, wherein modulating the chaotic signal with a modulating signal comprises:
and modulating at least one of the laser intensity, the phase and the frequency of the chaotic signal by adopting the modulation signal.
10. A method of signal transmission, the method comprising:
receiving a modulated chaotic signal carrying target information, and converting the modulated chaotic signal carrying the target information into a first electric signal;
generating a chaotic signal, and modulating the chaotic signal by adopting a modulation signal to obtain a modulated chaotic signal;
converting the modulated chaotic signal into a second electrical signal;
and subtracting the second electric signal from the first electric signal to obtain the target information.
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| CN202011005524.1A CN112202500A (en) | 2020-09-22 | 2020-09-22 | Signal transmitting device, signal receiving device and chaotic encryption optical communication system |
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| CN202011005524.1A CN112202500A (en) | 2020-09-22 | 2020-09-22 | Signal transmitting device, signal receiving device and chaotic encryption optical communication system |
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