CN108964873B - Physical layer protection method, system, networking method and network of chaotic optical network - Google Patents
Physical layer protection method, system, networking method and network of chaotic optical network Download PDFInfo
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- CN108964873B CN108964873B CN201810866610.8A CN201810866610A CN108964873B CN 108964873 B CN108964873 B CN 108964873B CN 201810866610 A CN201810866610 A CN 201810866610A CN 108964873 B CN108964873 B CN 108964873B
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- H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
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- H04K1/025—Secret communication by adding a second signal to make the desired signal unintelligible using an analogue chaotic signal
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Abstract
The invention discloses a physical layer protection method, a physical layer protection system, a networking method and a network of a chaotic optical network, and relates to the field of physical layer protection of the chaotic optical network. The multi-dimensional physical layer protection method comprises the following steps: after the optical chaotic phase modulation is carried out on the sending end, digital chaotic encryption is carried out, the speed of polarization change and the change quantity of each time are controlled, and two-stage hardware encryption is realized on a physical layer of the chaotic optical network; the receiving end firstly carries out digital chaos decryption and then carries out optical chaos phase demodulation, and two-stage hardware decryption is realized on a physical layer of the chaos optical network. The invention encrypts in three dimensions of time, frequency and polarization, the chaos signal and the polarization disturbance obviously enhance the density, and the speed of polarization change and the change quantity of each time are controlled, so that the interception probability is obviously reduced.
Description
Technical Field
The invention relates to the field of physical layer protection of a chaotic optical network, in particular to a physical layer protection method, a physical layer protection system, a networking method and a network of the chaotic optical network.
Background
The technical key points of the chaotic optical communication system are three parts: chaotic light generation, chaotic light modulation and chaotic light receiving. There are four main structures for generating chaotic light: the device comprises four structures of direct current modulation, external light injection, external light feedback and photoelectric feedback. The chaotic light modulation method comprises the following steps: chaotic Modulation (CM), Chaotic Masking (CMs), and chaotic keying (CSK). The performance of chaotic modulation is superior to that of chaotic keying, and the performance of chaotic keying is superior to that of chaotic masking. The secret and high-efficiency chaotic optical communication system is often limited by device parameters, structures and modulation modes, and chaotic synchronization parameters determine a balance point required to find the complexity and feasibility of the chaos.
The chaotic optical communication can adopt a conventional optical communication device, generates chaotic carriers by utilizing nonlinearity of a modulator, is easy to be compatible with the conventional optical communication system, and is also the only chaotic encryption scheme for realizing secret transmission in the international commercial network. In the photoelectric feedback scheme, a structure that a receiving end is open-loop and sending data participates in chaotic light generation is generally adopted, so that external light feedback is relatively easy to realize, and higher chaotic light bandwidth and transmission distance can be obtained. In a point-to-point chaotic optical communication system, a communication structure adopting photoelectric feedback and open loop receiving is designed.
Chaotic light communication utilizes the chaotic attribute to complete chaotic light generation and synchronization, and optical devices used at a receiving end and a transmitting end have to have very close chaotic attributes. In the networking process of the chaotic security system, the difficulty is high, and if the encryption structure only utilizes the physical layer of the system, networking can be performed by using a data link layer. The networking system only needs to add system software functions without additionally adding devices, is easy to commercialize, and has the possibility of compatibility with the existing commercial system.
The chaotic communication can provide a remarkable physical layer protection effect for signals, and if a third party can obtain a communication device of the same type as a transmitting system and realize pairing with a transmitting end through careful regulation, the chaotic signals can still be received. In addition, the existing chaotic encryption is realized in a time domain feedback mode, and can be cracked by sampling a time sequence and utilizing a complex mathematical algorithm. The density of the time domain feedback chaotic system can be improved by a plurality of encryption modes such as software encryption and the like, but the problem cannot be fundamentally solved.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provides a physical layer protection method, a system, a networking method and a network of a chaotic optical network, wherein encryption is carried out on three dimensions of time, frequency and polarization, the density of the chaotic signal and polarization disturbance is obviously enhanced, the speed of polarization change and the change quantity of each time are controlled, and the interception probability is obviously reduced.
In a first aspect, the present invention provides a method for multi-dimensional physical layer protection of a chaotic optical network, comprising the following steps:
after the optical chaotic phase modulation is carried out on the sending end, digital chaotic encryption is carried out, the speed of polarization change and the change quantity of each time are controlled, and two-stage hardware encryption is realized on a physical layer of the chaotic optical network;
the receiving end firstly carries out digital chaos decryption and then carries out optical chaos phase demodulation, and two-stage hardware decryption is realized on a physical layer of the chaos optical network.
In a second aspect, the present invention further provides an optical-electrical feedback type multi-dimensional physical layer protection system for implementing the above method, where the system includes a transmitting end and a receiving end, the transmitting end includes at least one optical chaotic phase modulation loop and a polarization controller with a polarization adding circuit, the polarization adding circuit controls the speed of polarization change and the amount of change each time of the polarization controller, and the receiving end includes a polarization controller with a depolarization circuit and at least one optical chaotic phase demodulation loop.
On the basis of the technical scheme, the polarization disturbance speed of the polarization adding circuit is at least 500K radians per second, and the polarization elimination speed of the depolarization circuit corresponds to the polarization disturbance speed of the polarization adding circuit.
On the basis of the technical scheme, the polarization controller is realized by a light polarization controller, and the light polarization controller comprises a wave plate type polarization controller, a fiber ring type polarization controller, an electro-optic type polarization controller and a calendaring type polarization controller.
On the basis of the technical scheme, the transmitting end comprises a laser, a first phase modulator used for inputting information, at least one optical chaotic phase modulation ring, a first polarization controller with a polarization adding circuit and an erbium-doped fiber amplifier EDFA which are sequentially connected, wherein the polarization adding circuit controls the speed of polarization change of the first polarization controller and the change quantity of the polarization controller each time.
On the basis of the technical scheme, the optical chaotic phase modulation ring comprises a second phase modulator, a first optical coupler, a first delay line, a Differential Phase Shift Keying (DPSK) modulator, a first photoelectric detector and a first electric amplifier which are sequentially connected to form a closed loop, wherein the first optical coupler is connected with a polarization controller with a polarization adding circuit, the polarization controller with the polarization adding circuit is connected with an EDFA, and the EDFA is connected with an optical fiber.
On the basis of the technical scheme, the receiving end comprises a second polarization controller with a depolarization circuit, at least one optical chaotic phase demodulation ring, a first DPSK demodulator and a second photoelectric detector which are sequentially connected.
On the basis of the technical scheme, the optical chaotic phase demodulation loop comprises a second optical coupler, a third phase modulator, a second electrical amplifier, a third photoelectric detector, a second DPSK demodulator and a second delay line which are sequentially connected to form a closed loop, one end of a second polarization controller with a depolarization circuit is connected with an optical fiber, the other end of the second polarization controller is connected with the second optical coupler, the third phase modulator, the first DPSK demodulator and the second photoelectric detector are sequentially connected, and the second photoelectric detector outputs information.
In a third aspect, the present invention further provides a data link layer networking method of a chaotic optical network, including the following steps:
the nodes participating in networking comprise a sending end and/or a receiving end, the sending end comprises at least one optical chaotic phase modulation ring and a polarization controller with a polarization adding circuit, the polarization adding circuit controls the speed of polarization change and the change amount of each time of the polarization controller, and the receiving end comprises a polarization controller with a depolarization circuit and at least one optical chaotic phase demodulation ring;
the parameters of the polarization controller, the optical chaotic phase modulation loop and/or the optical chaotic phase demodulation loop in two nodes which are physically connected are the same, information interaction is realized on a data link layer through software, chaotic networking is realized through an optical-to-electrical conversion mode, each node is equivalent to a chaotic repeater, and the communication distance of chaotic signals is prolonged.
In a fourth aspect, the present invention further provides a chaotic optical network networked at a data link layer, including a plurality of nodes participating in networking, where the nodes participating in networking include a transmitting end and/or a receiving end, the transmitting end includes at least one optical chaotic phase modulation loop and a polarization controller with a polarization adding circuit, the polarization adding circuit controls the speed of polarization change and the amount of change each time of the polarization controller, and the receiving end includes a polarization controller with a depolarization circuit and at least one optical chaotic phase demodulation loop;
the parameters of the polarization controller, the optical chaotic phase modulation loop and/or the optical chaotic phase demodulation loop in two nodes which are physically connected are the same, information interaction is realized on a data link layer through software, chaotic networking is realized through an optical-to-electrical conversion mode, each node is equivalent to a chaotic repeater, and the communication distance of chaotic signals is prolonged.
Compared with the prior art, the invention has the following advantages:
the invention encrypts in three dimensions of time, frequency and polarization, chaos signals and polarization disturbance obviously enhance the density, control the speed of polarization change and the change quantity of each time, and obviously reduce the interception probability; meanwhile, the chaotic signal has good synchronization quality, the polarization disturbance is easy to eliminate, and the long-distance optical fiber transmission of high-speed coherent optical signals can be realized; the multi-node chaotic networking can be realized, and the method is applied to the fields of the existing commercial dense wavelength division multiplexing optical network and the like.
Drawings
Fig. 1 is a schematic structural diagram of a photoelectric feedback type multi-dimensional physical layer protection system of a primary optical chaotic phase modulation plus polarization controller in an embodiment of the present invention.
FIG. 2 is a diagram illustrating the polarization perturbation rate of the polarization adding circuit in an embodiment of the present invention.
FIG. 3 is a diagram illustrating the polarization removal rate of a depolarizing circuit in an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a photoelectric feedback type multi-dimensional physical layer protection system of a two-stage optical chaotic phase modulation plus polarization controller in the embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a photoelectric feedback type multi-dimensional physical layer protection system with three or more levels of optical chaotic phase modulation and a polarization controller in the embodiment of the invention.
Fig. 6 is a schematic diagram of a two-layer transmission structure of chaotic optical communication networking.
Fig. 7 is a ring topology diagram of a chaotic optical network.
Fig. 8 is a schematic diagram of a star topology of a chaotic optical network.
Fig. 9 is a schematic diagram of a mesh topology of a chaotic optical network.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Example 1
Embodiment 1 of the present invention provides a multi-dimensional physical layer protection method for a chaotic optical network, including the following steps:
after the optical chaotic phase modulation is carried out on the sending end, digital chaotic encryption is carried out, the speed of polarization change and the change quantity of each time are controlled, and two-stage hardware encryption is realized on a physical layer of the chaotic optical network;
the receiving end firstly carries out digital chaos decryption and then carries out optical chaos phase demodulation, and two-stage hardware decryption is realized on a physical layer of the chaos optical network.
The chaotic system has two modulation modes of intensity and phase. The phase chaotic system has constant power and stronger tolerance capability to nonlinearity and dispersion, so that a better signal-to-noise ratio can be obtained by improving the power of the optical fiber, better transmission performance is obtained, and higher transmission rate and longer transmission distance can be realized.
The embodiment of the invention carries out physical layer protection on the chaotic optical network based on three dimensions of time, frequency and polarization. The physical layer protection of the chaotic optical communication system is that after optical chaotic phase modulation is carried out at a sending end, a polarization controller with a polarization circuit is added to carry out digital chaotic encryption, and two-stage hardware encryption is realized at the physical layer of a chaotic optical network; the receiving end is connected with a polarization controller with a depolarization circuit, then optical chaotic phase demodulation is carried out, and two-stage hardware decryption is realized on a physical layer of the chaotic optical network.
Example 2
Referring to fig. 1, an embodiment 2 of the present invention provides an optical-electrical feedback type multi-dimensional physical layer protection system, which is used to implement the multi-dimensional physical layer protection method in embodiment 1, and the system includes a transmitting end and a receiving end, where the transmitting end includes at least one optical chaotic phase modulation loop and a polarization controller with a polarization adding circuit, the polarization adding circuit controls the speed of polarization change and the amount of change each time of the polarization controller, and the receiving end includes a polarization controller with a depolarization circuit and at least one optical chaotic phase demodulation loop.
Fig. 1 shows a photoelectric feedback type phase modulation chaotic optical communication structure with a polarization controller. Fig. 2 and 3 are schematic diagrams of disturbance curves and elimination polarization curves of polarization controllers at a transmitting end and a receiving end. Transceive matching is required for proper decryption. Because the polarization disturbance curve is a simulation curve in a wide frequency range, the state space is very huge, and the cracking difficulty is very high.
Referring to fig. 2, the polarization disturbance rate of the polarization adding circuit is at least 500K radians per second (rad/s), and referring to fig. 3, the polarization removal rate of the depolarization circuit corresponds to the polarization disturbance rate of the polarization adding circuit.
The polarization controller is implemented by an optical polarization controller. Currently, the light polarization controller includes a wave plate type polarization controller, an optical fiber ring type polarization controller, an electro-optic type polarization controller, and a calender type polarization controller. The latter two kinds of light polarization controllers can implement software control on the disturbance speed of polarization and the size of each change, and are flexible. In addition, the setting of the disturbance speed can also use various random algorithms to generate numbers, such as digital chaos and the like.
When the polarization disturbance change rate of the security system is more than 500k, the error rate of the system no longer meets the original design requirement, the optical signal intensity is still in a normal state, and the coherent receiver cannot correctly decode. When a corresponding polarization controller is installed at the receiving end, the influence of polarization disturbance change of the transmitting end is eliminated, and signal decryption can be realized by utilizing the phase chaotic demodulation system.
After the phase modulation chaotic optical communication system, a polarization control technology is combined with an optical chaotic technology, the dimension of rapid change of optical polarization is introduced, the polarization of the system is disturbed, the receiving performance of the system is gradually reduced along with the increase of the polarization disturbance rate, and when the disturbance reaches a certain rate, a coherent system cannot demodulate signals, so that the confidentiality effect is achieved.
The polarization change rate can not be constant, the change is more disordered, which is equivalent to increasing the physical state space of the security system, greatly improving the security of the original chaotic optical communication system, reducing the possibility that an illegal third party realizes decryption by obtaining the same physical device, and realizing high security transmission of large-capacity data.
The polarization controller is added into the optical fiber transmission line, which is equivalent to the improvement of the physical state parameter of the encryption system, thereby greatly improving the density of the system. The polarization controller is added in the optical fiber transmission line and is directly loaded on the phase chaotic modulation, which is equivalent to re-encryption of the front chaotic system, and independent encryption of two stages in different modes is realized.
After the polarization controller is added into the system, the polarization of the coherent system is disturbed, the disturbance rate can be changed, and the offset of each time can be different, so that the difficulty in cracking the chaotic system is increased.
The polarization controller is represented on the polarization variation and the variation speed, the receiving end can only measure the variation at a certain moment and the next moment, the next variation cannot be predicted, even if the same polarization controller is installed, the parameters of polarization disturbance applied by the transmitting end need to be known to eliminate the polarization interference, the autocorrelation spectrums of the polarization variations are similar to white noise, and therefore the parameters are equivalent to a secret key of the second-level encryption of a coherent system.
Example 3
As an optional implementation manner, on the basis of embodiment 2, referring to fig. 1, the transmitting end includes a laser, a first phase modulator for inputting information, an Optical chaotic phase modulation loop, a first polarization controller with a polarization adding circuit, and an EDFA (Erbium-Doped Fiber Amplifier), which are connected in sequence, where the polarization adding circuit controls the speed of polarization change of the first polarization controller and the amount of change each time.
In a preferred embodiment, the optical chaotic Phase modulation loop comprises a second Phase modulator, a first optical coupler, a first delay line, a DPSK (Differential Phase Shift Keying) modulator, a first photodetector, and a first electrical amplifier, which are connected in sequence to form a closed loop, wherein the first optical coupler is connected to a first polarization controller with a polarization adding circuit, the first polarization controller with the polarization adding circuit is connected to an EDFA, and the EDFA is connected to an optical fiber.
The receiving end comprises a second polarization controller with a depolarization circuit, an optical chaotic phase demodulation ring, a first DPSK demodulator and a second photoelectric detector which are connected in sequence.
As a preferred embodiment, the optical chaotic phase demodulation loop comprises a second optical coupler, a third phase modulator, a second electrical amplifier, a third photodetector, a second DPSK demodulator and a second delay line which are sequentially connected to form a closed loop, wherein one end of a second polarization controller with a depolarization circuit is connected to an optical fiber, the other end of the second polarization controller is connected to the second optical coupler, the third phase modulator, the first DPSK demodulator and the second photodetector are sequentially connected, and the second photodetector outputs information.
The chaotic carrier light of the sending end is generated by an optical chaotic phase modulation ring consisting of a phase modulator, an optical coupler, a delay line, a DPSK modulator, a photoelectric detector and an electric amplifier, and the sent data is modulated on the first phase modulator, injected into the optical chaotic phase modulation ring, participates in the generation of the chaotic light and is modulated on the chaotic light carrier.
An optical signal received by a receiving end firstly enters a polarization controller with a depolarization circuit and then enters an optical chaotic phase demodulation ring to carry out optical phase hybrid loop demodulation to obtain a normal signal without optical hybrid modulation, and then the normal signal is injected into a light path formed by a coherent demodulator and a photoelectric detector to realize data demodulation of a coherent system.
The chaotic optical communication system adds a polarization controller with a polarization adding circuit behind an optical chaotic phase modulation ring at a transmitting end, and adds a corresponding polarization controller with a depolarization circuit before the optical chaotic phase demodulation at a receiving end. Therefore, the polarization change influence of the original chaotic light signal added by the transmitting end can be eliminated. The chaotic signal has certain randomness in amplitude and phase, is greatly influenced by an initial value, and has the characteristic of unpredictable property.
Example 4
As an optional implementation manner, on the basis of embodiment 3, referring to fig. 4, the sending end includes a laser, a first phase modulator for inputting information, 2 optical chaotic phase modulation loops, a first polarization controller with a polarization adding circuit, and an EDFA, which are connected in sequence, where the polarization adding circuit controls the speed of polarization change of the first polarization controller and the amount of change each time.
The receiving end comprises a second polarization controller with a depolarization circuit, 2 optical chaotic phase demodulation rings, a first DPSK demodulator and a second photoelectric detector which are sequentially connected, and the second photoelectric detector outputs information. The structure of the optical chaotic phase modulation ring in embodiment 4 is the same as that of the optical chaotic phase modulation ring in embodiment 3, and the structure of the optical chaotic phase demodulation ring in embodiment 4 is the same as that of the optical chaotic phase demodulation ring in embodiment 3.
Fig. 4 is a two-stage chaotic modulation and polarization controller-added photoelectric feedback type phase modulation chaotic optical communication structure. The complexity of a single chaotic secret modulation to a secret system is limited, and the complexity of the system needs to be improved more along with the development of the capability of a computing chip, so that the embodiment of the invention provides the optical chaotic secret system with two-stage chaotic modulation and demodulation.
The method is also easy to realize in engineering, as long as the receiving end eliminates most polarization disturbance, that is, the polarization added by the transmitting end is not necessarily eliminated completely, the final polarization deviation is within the tolerable range of the coherent system, and the system can also demodulate, which is the advantage of the coherent system.
In addition, the photoelectric feedback chaotic structure is based on a common photoelectronic device, pairing is easy to realize for legal users, the photoelectric feedback chaotic structure can be seamlessly compatible with the existing optical communication system, and for illegal users, time delay parameters of a feedback loop and the change rate of a polarization controller need to be known besides all the photoelectronic devices are completely matched. Therefore, the structure gives consideration to practicability, confidentiality and compatibility.
Example 5
As an optional implementation manner, on the basis of embodiment 4, referring to fig. 5, the transmitting end includes a laser, a first phase modulator for inputting information, 3 or more than 3 optical chaotic phase modulation loops, a first polarization controller with a polarization adding circuit, and an EDFA, which are connected in sequence, where the polarization adding circuit controls the speed of polarization change of the first polarization controller and the amount of change each time.
The receiving end comprises a second polarization controller with a depolarization circuit, 3 or more than 3 optical chaotic phase demodulation rings, a first DPSK demodulator and a second photoelectric detector which are connected in sequence, and the second photoelectric detector outputs information. The structure of the optical chaotic phase modulation loop in embodiment 5 is the same as that of the optical chaotic phase modulation loops in embodiments 3 and 4, and the structure of the optical chaotic phase demodulation loop in embodiment 5 is the same as that of the optical chaotic phase demodulation loops in embodiments 3 and 4.
With the improvement of the device level and the improvement of the algorithm, the three-level and above phase modulation chaotic optical communication system can be commercially used in the future, and the structural block diagram is shown in fig. 5. The system can improve the complexity of the security system and is more difficult to crack. That is, the hardware and software algorithm cracking technology is continuously increased, the series number of the chaotic security system is increased, and the synchronous increase is kept.
Example 6
On the basis of the optoelectronic feedback type multidimensional physical layer protection system in embodiment 2, embodiment 6 of the present invention provides a data link layer networking method for a chaotic optical network, including the following steps:
the nodes participating in networking comprise a sending end and/or a receiving end, the sending end comprises at least one optical chaotic phase modulation ring and a polarization controller with a polarization adding circuit, and the polarization adding circuit controls the speed of polarization change and the change quantity of each time of the polarization controller; the receiving end comprises a polarization controller with a depolarization circuit and at least one optical chaotic phase demodulation loop.
The parameters of the polarization controller, the optical chaotic phase modulation loop and/or the optical chaotic phase demodulation loop in two nodes which are physically connected are the same, information interaction is realized on a data link layer through software, chaotic networking is realized through an optical-to-electrical conversion mode, each node is equivalent to a chaotic repeater, and the communication distance of chaotic signals is prolonged.
In practical application, all the nodes can adopt photoelectric devices with the same characteristics and polarization controllers. All nodes participating in networking can adopt the same polarization controller setting to realize multi-node networking communication, and nodes not participating in networking can adopt different polarization controller settings.
The embodiment of the invention designs a networking mode of a security system, and the networking mode is carried out on a data link layer. The secret optical communication networking still considers that a physical layer adopts a point-to-point communication mode, the same parameter setting is adopted only at two nodes which are physically connected, and information exchange is realized by software at a data link layer. Considering the characteristics of an external photoelectric anti-chaotic system, all nodes need to adopt photoelectric devices and polarization controllers with the same characteristics. The same polarization controller setting is adopted for all nodes needing to realize communication, multi-node networking communication is realized, and nodes needing no communication can adopt different polarization controller settings.
The data link layer networking is built on top of a two-layer communication layer structure as shown in fig. 6. The physical system composed of the chaotic communication system is located at the lowest layer, called the physical layer, and is mainly responsible for point-to-point unidirectional or bidirectional communication. Above the physical layer is the link layer, which is mainly responsible for link selection, information forwarding or data reception by software. The conventional network topologies include ring, star, mesh, etc., as shown in fig. 7, fig. 8, and fig. 9, respectively. In various network topological structures, every two nodes communicate with each other, signals are identified in an electric domain after receiving chaotic signals, signals required by the nodes are sent down, information required to be transmitted to other nodes from the previous node and sent signals of the nodes are packaged and encapsulated, the information and the sent signals are sent to the next node which communicates with the previous node together, the next node receives and forwards the information, and the like, so that communication among multiple nodes is realized. For the star topology, all nodes communicate with the central node, and the central node performs store-and-forward. Therefore, the networking mode mainly realizes chaotic networking through a photoelectric optical conversion mode. The scheme is characterized in that each node is equivalent to a chaotic repeater, and the communication distance of chaotic signals can be prolonged.
Example 7
On the basis of the optical-electrical feedback type multi-dimensional physical layer protection system in embodiment 2, embodiment 7 of the present invention provides a chaotic optical network in data link layer networking, including a plurality of nodes participating in networking, where the nodes participating in networking include a transmitting end and/or a receiving end, the transmitting end includes at least one optical chaotic phase modulation ring and a polarization controller with a polarization adding circuit, and the polarization adding circuit controls the speed of polarization change and the amount of change of the polarization controller each time; the receiving end comprises a polarization controller with a depolarization circuit and at least one optical chaotic phase demodulation loop.
The parameters of the polarization controller, the optical chaotic phase modulation loop and/or the optical chaotic phase demodulation loop in two nodes which are physically connected are the same, information interaction is realized on a data link layer through software, chaotic networking is realized through an optical-to-electrical conversion mode, each node is equivalent to a chaotic repeater, and the communication distance of chaotic signals is prolonged.
In practical application, all the nodes can adopt photoelectric devices with the same characteristics and polarization controllers. All nodes participating in networking can adopt the same polarization controller setting to realize multi-node networking communication, and nodes not participating in networking can adopt different polarization controller settings.
Various modifications and variations of the embodiments of the present invention may be made by those skilled in the art, and they are also within the scope of the present invention, provided they are within the scope of the claims of the present invention and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (9)
1. A multi-dimensional physical layer protection method of a chaotic optical network is characterized by comprising the following steps:
after the optical chaotic phase modulation is carried out on the sending end, digital chaotic encryption is carried out, the speed of polarization change and the change quantity of each time are controlled, and two-stage hardware encryption is realized on a physical layer of the chaotic optical network;
the receiving end firstly carries out digital chaos decryption and then carries out optical chaos phase demodulation, and two-stage hardware decryption is realized on a physical layer of the chaos optical network;
the transmitting end comprises at least one optical chaotic phase modulation ring and a polarization controller with a polarization adding circuit, the polarization adding circuit controls the speed of polarization change and the change quantity of the polarization controller each time, and the receiving end comprises a polarization controller with a depolarization circuit and at least one optical chaotic phase demodulation ring.
2. The multi-dimensional physical layer protection method of a chaotic optical network as claimed in claim 1, wherein: the polarization disturbance speed of the polarization adding circuit is at least 500K radians per second, and the polarization elimination speed of the depolarization circuit corresponds to the polarization disturbance speed of the polarization adding circuit.
3. The multi-dimensional physical layer protection method of a chaotic optical network as claimed in claim 1, wherein: the polarization controller is realized by a light polarization controller, and the light polarization controller comprises a wave plate type polarization controller, an optical fiber ring type polarization controller, an electro-optic type polarization controller and a calendaring type polarization controller.
4. The multi-dimensional physical layer protection method of a chaotic optical network as claimed in claim 1, wherein: the transmitting end comprises a laser, a first phase modulator used for inputting information, at least one optical chaotic phase modulation ring, a first polarization controller with a polarization adding circuit and an erbium-doped fiber amplifier (EDFA) which are sequentially connected, wherein the polarization adding circuit controls the speed of polarization change of the first polarization controller and the change quantity of the polarization change every time.
5. The multi-dimensional physical layer protection method of a chaotic optical network as claimed in claim 4, wherein: the optical chaotic phase modulation ring comprises a second phase modulator, a first optical coupler, a first delay line, a Differential Phase Shift Keying (DPSK) modulator, a first photoelectric detector and a first electric amplifier which are sequentially connected to form a closed loop, wherein the first optical coupler is connected with a first polarization controller with a polarization adding circuit, the first polarization controller with the polarization adding circuit is connected with an EDFA, and the EDFA is connected with an optical fiber.
6. The multi-dimensional physical layer protection method of a chaotic optical network as claimed in claim 5, wherein: the receiving end comprises a second polarization controller with a depolarization circuit, at least one optical chaotic phase demodulation loop, a first DPSK demodulator and a second photoelectric detector which are sequentially connected.
7. The method of multi-dimensional physical layer protection for a chaotic optical network as claimed in claim 6, wherein: the optical chaotic phase demodulation loop comprises a second optical coupler, a third phase modulator, a second electric amplifier, a third photoelectric detector, a second DPSK demodulator and a second delay line which are sequentially connected to form a closed loop, wherein one end of a second polarization controller with a depolarization circuit is connected with an optical fiber, the other end of the second polarization controller is connected with the second optical coupler, the third phase modulator, the first DPSK demodulator and the second photoelectric detector are sequentially connected, and the second photoelectric detector outputs information.
8. A data link layer networking method of a chaotic optical network is characterized by comprising the following steps:
the nodes participating in networking comprise a sending end and a receiving end, the sending end comprises at least one optical chaotic phase modulation ring and a polarization controller with a polarization adding circuit, the polarization adding circuit controls the speed of polarization change and the change amount of each time of the polarization controller, and the receiving end comprises a polarization controller with a depolarization circuit and at least one optical chaotic phase demodulation ring;
the parameters set by the polarization controllers in the two nodes which are physically connected are the same, the parameters set by the optical chaotic phase modulation loop and the optical chaotic phase demodulation loop are the same, information interaction is realized on a data link layer through software, chaotic networking is realized through an optical-to-electrical conversion mode, each node is equivalent to a chaotic repeater, and the communication distance of chaotic signals is prolonged;
the transmitting end comprises at least one optical chaotic phase modulation ring and a polarization controller with a polarization adding circuit, the polarization adding circuit controls the speed of polarization change and the change quantity of the polarization controller each time, and the receiving end comprises a polarization controller with a depolarization circuit and at least one optical chaotic phase demodulation ring;
after the optical chaotic phase modulation is carried out on the sending end, digital chaotic encryption is carried out, the speed of polarization change and the change quantity of each time are controlled, and two-stage hardware encryption is realized on a physical layer of the chaotic optical network;
the receiving end firstly carries out digital chaos decryption and then carries out optical chaos phase demodulation, and two-stage hardware decryption is realized on a physical layer of the chaos optical network.
9. A chaotic optical network networking in a data link layer comprises a plurality of nodes participating in networking, wherein the nodes participating in networking comprise a sending end and a receiving end, and the chaotic optical network networking method is characterized in that: the transmitting end comprises at least one optical chaotic phase modulation ring and a polarization controller with a polarization adding circuit, the polarization adding circuit controls the speed of polarization change and the change quantity of the polarization controller each time, and the receiving end comprises a polarization controller with a depolarization circuit and at least one optical chaotic phase demodulation ring;
the parameters set by the polarization controllers in the two nodes which are physically connected are the same, the parameters set by the optical chaotic phase modulation loop and the optical chaotic phase demodulation loop are the same, information interaction is realized on a data link layer through software, chaotic networking is realized through an optical-to-electrical conversion mode, each node is equivalent to a chaotic repeater, and the communication distance of chaotic signals is prolonged;
the transmitting end comprises at least one optical chaotic phase modulation ring and a polarization controller with a polarization adding circuit, the polarization adding circuit controls the speed of polarization change and the change quantity of the polarization controller each time, and the receiving end comprises a polarization controller with a depolarization circuit and at least one optical chaotic phase demodulation ring;
after the optical chaotic phase modulation is carried out on the sending end, digital chaotic encryption is carried out, the speed of polarization change and the change quantity of each time are controlled, and two-stage hardware encryption is realized on a physical layer of the chaotic optical network;
the receiving end firstly carries out digital chaos decryption and then carries out optical chaos phase demodulation, and two-stage hardware decryption is realized on a physical layer of the chaos optical network.
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