CN111416701B - High-safety orthogonal mode division multiplexing access method and system based on vector disturbance - Google Patents
High-safety orthogonal mode division multiplexing access method and system based on vector disturbance Download PDFInfo
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Abstract
The invention discloses a high-safety orthogonal mode division multiplexing access method based on vector disturbance, which comprises the following steps: the transmitting end and the receiving end adopt a chaos encryption technology based on vector disturbance, signals transmitted under each orthogonal mode are changed through the vector disturbance, different orthogonal modes are controlled by utilizing a chaos sequence, and the encryption and decryption process of the signals in an orthogonal mode multiplexing system is completed. The invention can improve the space density of the optical fiber to increase the transmission capacity, greatly improve the transmission safety of the access network system, and maximize the safety performance of the system under the condition of not influencing the transmission speed and the signal transmission quality of the system.
Description
Technical Field
The invention relates to the technical field of digital signal processing chaotic encryption, in particular to a high-safety orthogonal mode division multiplexing access method and system based on vector disturbance.
Background
The access network is all devices between the user terminal and the backbone network, and when a user uploads or downloads data, signals need to pass through the backbone network and the access network. At present, a backbone network has a large transmission capacity and a high transmission speed, while an access network is limited by the limited transmission capacity and transmission speed, and becomes a short board for data transmission, that is, the transmission speed and the signal quality of signals of the access network directly affect the visual experience of each user. With the continuous advance of communication technology and the blowout type emergence of new services, people put forward higher and higher requirements on communication capacity.
At the same time, communications across these networks must be properly protected due to the dramatic increase in network usage and the increase in accessibility of optical networks. As with any other type of network, the first line for securing communications begins with the use of an encryption protocol at a higher level in the protocol stack. However, establishing security on an unsecured basis is a dangerous practice, and therefore, there is a need to ensure that the physical layer of the optical system can deal with threats that may be directed at the lowest layers of the optical network.
Through the development of many years, the technologies of erbium-doped fiber amplification (EDFA), wavelength Division Multiplexing (WDM), polarization multiplexing (PDM), time division multiplexing (OTDM), coherent communication, error correction coding, etc. appearing in fiber communication gradually meet the increasing communication bandwidth demand, however, the transmission channel supported by the most advanced technologies of WDM, high-order modulation, digital signal processing, etc. still remains a single-mode fiber with limited capacity, and due to the bottleneck brought by the signal-to-noise ratio and nonlinearity, the capacity resource of the single-mode fiber is facing to be exhausted, so that a new fiber communication technology needs to be developed to solve the problem. Under the background, the communication capacity is effectively increased due to the appearance of the orthogonal mode division multiplexing technology, the orthogonal mode division multiplexing enables a plurality of orthogonal modes to be multiplexed on the coaxial height, different signals can be transmitted in different modes due to the fact that the modes are orthogonal with each other, the space density of the optical fiber is greatly improved, and the communication capacity of the optical fiber is improved.
Encryption is an effective method to protect signals and enhance network confidentiality in the physical layer. Chaotic encryption mainly utilizes a sequence generated by chaotic system iteration as a factor sequence of encryption exchange. The chaotic system has the characteristics of nonlinearity, randomness, non-convergence, unpredictability, high sensitivity to initial conditions, easiness in generation and copying and the like, so that the chaotic system is suitable for the fields of information encryption, secret communication and the like. It has two main characteristics: (1) Giving an initial value, wherein the number of timely iterations is large enough, and the final evolution state of the system is uncertain; (2) The method is sensitive to initial conditions, namely the initial conditions have slight differences, and after a certain number of iterations, the system state can generate great differences. Logistic chaos is a common chaos signature and is widely used. However, although the chaotic encryption technology can avoid these disadvantages to some extent, it has high requirements on the transmitting and receiving end instruments and requires high received optical power.
Disclosure of Invention
The invention aims to provide a high-safety orthogonal mode division multiplexing access method and a system based on vector disturbance, which combine the traditional chaotic encryption method with orthogonal mode division multiplexing and flexibly change signals transmitted under each orthogonal mode through vector disturbance; an orthogonal mode division multiplexing system structure under four modes is designed, a chaotic encryption technology based on vector disturbance is adopted at a transmitting end and a receiving end, and four different orthogonal modes are used for multiplexing and vector disturbance. The invention can improve the space density of the optical fiber to increase the transmission capacity, greatly improve the transmission safety of the access network system, and maximize the safety performance of the system under the condition of not influencing the transmission speed and the signal transmission quality of the system.
To achieve the above object, with reference to fig. 1, the present invention provides a high-security orthogonal mode division multiplexing access method based on vector perturbation, where the access method includes:
the transmitting end and the receiving end adopt a chaos encryption technology based on vector disturbance, signals transmitted under each orthogonal mode are changed through the vector disturbance, different orthogonal modes are controlled by utilizing a chaos sequence, and the encryption and decryption process of the signals in an orthogonal mode multiplexing system is completed.
As a preferred example, the access method includes:
s1, performing serial-parallel conversion on every four 16CAP symbols generated by a transmitting end, and converting one path of signals into four paths of parallel signals in a balanced manner;
s2, generating a first permutation vector through Rochester chaotic mapping;
s3, applying vector disturbance to the four paths of parallel signals generated by conversion in the step S1 by adopting the first displacement vector;
s4, transmitting the four paths of parallel signals to a receiving end in four modes in a new randomly generated arrangement mode;
s5, generating an opposite second permutation vector at the receiving end through chaotic mapping;
and S6, carrying out inverse vector disturbance on the four received paths of parallel signals by adopting a second permutation vector, and decrypting the four received paths of parallel signals into a path of four 16CAP symbols in the original sequence.
As a preferred example, in step S4, the new arrangement includes 24 different transmission sequences from mode one, mode two, mode three, mode four to mode four, mode three, mode two, and mode one.
As a preferred example, in step S2, the process of generating the first permutation vector through the rochester chaotic map includes the following steps:
s21, generating a Rochester chaotic sequence which accords with a rule of uniform distribution from 0 to 1;
s22, processing the Rochester chaotic sequence generated by chaotic mapping, converting the Rochester chaotic sequence into a first permutation vector, wherein the first permutation vector obtained by conversion is a long vector containing four integers of 1, 2, 3 and 4 and can be truncated into any length, the occurrence rule of each number is disordered and unseen, and the probability of each number is the same as the whole.
As a preferred example, in step S21, the process of generating the rochester chaotic sequence includes the following steps:
s211, setting two parameters required by generating the Rochester chaotic sequence: an initial value X (0) and a parameter u;
s212, through a system equation: x (k + 1) = u × X (k) × [1-X (k) ], (k =0,1, \8230;, n) are iterated, generating a string of chaotic sequences, wherein the rochester function operates in a chaotic state when 0-but X (0) <1 and 3.5699456-but u < =4, k being the number of iterations.
As a preferred example, the process of processing the rochester chaotic sequence generated by the chaotic mapping and converting the processed rochester chaotic sequence into the first permutation vector includes the following steps:
processing the chaos sequence generated by the chaos mapping by adopting the following formula:
x‘(k)＝round[3*x(k)]+1
in the formula, x' (k) is the generated permutation vector, x (k) is the chaotic sequence, and k is the iteration number.
As a preferred example, each of the orthogonal modes adopted by the orthogonal mode multiplexing system is a ring mode, different modes have different sizes, and the orthogonal modes are multiplexed together by a multiplexer and then transmitted through a ring core optical fiber.
With reference to fig. 5, the present invention further provides a high-security orthogonal mode division multiplexing access system based on vector perturbation, where the access system includes a transmitting end digital signal processing module, a signal modulation module, a ring core optical fiber, an optical signal receiving module, and a receiving end digital signal processing module, which are connected in sequence;
the sending end digital signal processing module is used for carrying out series-parallel conversion on every four 16CAP symbols generated by the sending end, converting one path of signals into four paths of parallel signals in a balanced manner, generating a first permutation vector through Rochester chaotic mapping, and applying vector disturbance to the four paths of parallel signals generated by conversion by adopting the first permutation vector;
the signal modulation module is used for modulating four paths of parallel signals applying vector disturbance to generate optical signals of four modes which are coaxial and equal in height, consistent in optical path length and identical in polarization direction, and sending the optical signals to the optical signal receiving module through the ring core optical fiber;
the optical signal receiving module is used for sequentially carrying out sorting and filtering processing on the received optical signals in the four modes and converting the optical signals into four paths of parallel signals again;
and the receiving end digital signal processing module generates a reverse second permutation vector at the receiving end through chaotic mapping, performs inverse vector disturbance on the received four paths of parallel signals by adopting the second permutation vector, and decrypts the received four paths of parallel signals into one path of four 16CAP symbols in an original sequence.
As a preferred example, the sending-end digital signal processing module includes a first serial-to-parallel conversion unit, a 16CAP mapping unit, a second serial-to-parallel conversion unit, a first key generation unit, a chaotic mapping unit, and a vector perturbation unit;
the device comprises a first serial-parallel conversion unit, a 16CAP mapping unit, a second serial-parallel conversion unit and a vector disturbance unit which are sequentially connected, wherein the first serial-parallel conversion unit is used for converting an original pseudo-random sequence into four paths of parallel signals through serial-parallel conversion and outputting the four paths of parallel signals to the 16CAP mapping unit, the 16CAP mapping unit is used for carrying out 16CAP mapping on the received four paths of parallel signals, converting the four paths of parallel signals into one path of signals and outputting the one path of signals to the second serial-parallel conversion unit, and the second serial-parallel conversion unit is used for carrying out serial-parallel conversion on the received one path of signals, dividing the four paths of signals into four paths of signals and dividing the four paths of signals into four different orthogonal modes for transmission;
the first key generation unit is used for generating an encryption key and sending the encryption key to the chaotic mapping unit, the chaotic mapping unit is used for generating a first displacement vector through Rochester chaotic mapping, and the vector perturbation unit is used for applying vector perturbation to four parallel signals output by the second serial-to-parallel conversion unit by adopting the first displacement vector and sending the four parallel signals with the vector perturbation to the signal modulation module;
the receiving end digital signal processing module comprises an inverse vector perturbation unit, a second secret key generation unit, a chaotic demapping unit, a third parallel-serial conversion unit, a demapping unit, a fourth parallel-serial conversion unit and a signal output unit;
the second key generation unit is used for generating a decryption key and sending the decryption key to the chaotic demapping unit, the chaotic demapping unit is used for generating a second permutation vector through Rochester chaotic demapping, and the inverse vector perturbation unit is used for performing inverse vector perturbation on the received four-path parallel signals by adopting the second permutation vector, decrypting the received four-path parallel signals into one-path four 16CAP symbols in an original sequence, and achieving chaotic decryption of the signals; the third parallel-to-serial conversion unit, the demapping unit, the fourth parallel-to-serial conversion unit and the signal output unit are sequentially connected, and are used for performing 16CAP demapping on the decrypted signal, restoring the original signal through parallel-to-serial conversion, and outputting the original signal through the signal output unit.
As a preferred example, the signal modulation module includes an arbitrary waveform transmitter, a mach-zehnder modulator, an erbium-doped fiber amplifier, a first collimating mirror, a reflecting mirror, a spatial light modulator, a light path adjusting unit, and a second collimating mirror, which are connected in sequence;
the random waveform transmitter carries out synchronous digital-to-analog conversion on four paths of signals, outputs the conversion result to the Mach-Zehnder modulator to complete the modulation of the signals, the modulated signals sequentially pass through the erbium-doped optical fiber amplifier, the first collimating mirror and the reflecting mirror and are emitted into the spatial light modulator to be subjected to spatial light modulation so as to generate optical signals in different orthogonal modes, the generated optical signals in different orthogonal modes are adjusted through the optical path adjusting unit to enable the optical signals to be coaxial and equal in height, consistent in optical path length and same in polarization direction, and finally the adjusted optical signals are sent to the ring-core optical fiber through the second collimating mirror to be transmitted;
the optical signal receiving module comprises a quarter-wave plate, a 4f system, a mode selector, a four-path optical signal processing unit and an oscilloscope which are connected in sequence; each path of the optical signal processing unit comprises a variable optical attenuator, an erbium-doped optical fiber amplifier, an optical band-pass filter and a photodiode which are connected in sequence;
the optical signals of the four modes are converted into linear polarization states through the quarter-wave plates respectively, the linear polarization states are imaged into the mode sorter through the 4f system, the signal light of the four modes is separated, and each path of optical signal is connected into the oscilloscope for receiving after being filtered by one path of optical signal processing unit.
Compared with the prior art, the technical scheme of the invention has the following remarkable beneficial effects: the optical fiber space density is improved to increase the transmission capacity, meanwhile, the transmission safety of an access network system is greatly improved, and the safety performance of the system is maximized under the condition that the transmission speed and the signal transmission quality of the system are not influenced.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the presently disclosed subject matter.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a flowchart of a high-security orthogonal mode division multiplexing access method based on vector perturbation according to the present invention.
Fig. 2 is a flow chart of the chaotic encryption method based on vector perturbation in the orthogonal mode division multiplexing system of the present invention.
Fig. 3 is a schematic diagram of the orthogonal mode division multiplexing of the present invention.
FIG. 4 is a graph showing the relationship between the change in X value and the u value when X (0) is 0.5.
Fig. 5 is a schematic structural diagram of a high-security orthogonal mode division multiplexing access system based on vector perturbation.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
Detailed description of the preferred embodiment
With reference to fig. 1, the present invention provides a high-security orthogonal mode division multiplexing access method based on vector perturbation, where the access method includes:
the transmitting end and the receiving end adopt a chaos encryption technology based on vector disturbance, signals transmitted under each orthogonal mode are changed through the vector disturbance, different orthogonal modes are controlled by utilizing a chaos sequence, and the encryption and decryption process of the signals in an orthogonal mode multiplexing system is completed.
As a preferred example, the access method includes:
s1, performing serial-parallel conversion on every four 16CAP symbols generated by a transmitting end, and converting one path of signals into four paths of parallel signals in a balanced manner.
And S2, generating a first permutation vector through Rochester chaotic mapping.
And S3, applying vector disturbance to the four paths of parallel signals generated by conversion in the step S1 by adopting the first permutation vector.
And S4, transmitting the four paths of parallel signals to a receiving end in four modes in a new randomly generated arrangement mode.
And S5, generating an opposite second permutation vector at the receiving end through chaotic mapping.
And S6, carrying out inverse vector disturbance on the four received paths of parallel signals by adopting a second permutation vector, and decrypting the four received paths of parallel signals into a path of four 16CAP symbols in the original sequence.
Fig. 2 is a flow chart of the chaotic encryption method based on vector disturbance in the orthogonal mode division multiplexing system of the present invention. As can be seen from fig. 2, every four 16CAP symbols generated by the transmitting end are converted into four parallel signals through serial-parallel conversion, and a permutation vector generated by the rochester chaotic mapping applies vector perturbation to the four uniform parallel signals, for example, when the four signals are transmitted in parallel in the order of mode one, mode two, mode three, and mode four, 24 different transmission orders from mode one, mode two, mode three, mode four to mode four, mode three, mode two, and mode one may occur after the vector perturbation is applied, that is, the four signals may be transmitted in the four modes in 24 different arrangement manners. The receiving end generates reverse displacement vectors through chaotic mapping to carry out inverse vector disturbance, and decrypts the received four paths of signals into one path of four 16CAP symbols in a proper sequence, so that the encryption and decryption processes of the signals in the orthogonal mode multiplexing system are completed.
Different orthogonal mode multiplexing schematics are shown in fig. 3, each orthogonal mode of orthogonal mode multiplexing is a ring mode, different modes are different in size, and the orthogonal modes are multiplexed together by a multiplexer and then transmitted by a ring core optical fiber.
Generating a Logistic chaotic sequence requires two parameters, namely an initial value X (0) and a parameter u, and iteration through system equations X (k + 1) = u × X (k) × 1-X (k) ], (k =0,1, \ 8230;, n) can generate a string of chaotic sequences, where Logistic functions work in a chaotic state when 0< X (0) <1 and 3.5699456. < u < =4, i.e. a chaotic, unpredictable, chaotic state is shown in fig. 4.
In the chaotic encryption process, firstly, a chaotic sequence generated by chaotic mapping is preprocessed by the formula (1), and the chaotic sequence which is originally uniformly distributed from 0 to 1 is converted into a replacement vector which can realize vector disturbance on four modes. x' (k) is the generated permutation vector, and x (k) is the chaotic sequence.
x‘(k)＝round[3*x(k)]+1 (1)
The permutation vector obtained by calculation is a long vector containing four integers of 1, 2, 3 and 4, and can be truncated into any length, the occurrence probability of each digit is the same as the probability of each digit in general although the occurrence probability is unordered, and after the original bit sequence is converted into one symbol through 16CAP mapping, each symbol corresponds to each digit in the permutation vector one by one, and is transmitted through a corresponding mode. Therefore, the signal modulated by the 16CAP is not simply divided into four through serial-parallel conversion, but four paths of signals which are converted into parallel in a nonlinear, random, non-convergent and unpredictable way are transmitted through different modes respectively
Detailed description of the invention
With reference to fig. 5, the present invention further provides a high-security orthogonal mode division multiplexing access system based on vector perturbation, where the access system includes a transmitting end digital signal processing module, a signal modulation module, a ring core optical fiber, an optical signal receiving module, and a receiving end digital signal processing module, which are connected in sequence.
The sending end digital signal processing module is used for carrying out series-parallel conversion on every four 16CAP symbols generated by the sending end, converting one path of signals into four paths of parallel signals in a balanced mode, generating a first permutation vector through Rochester chaotic mapping, and applying vector disturbance to the four paths of parallel signals generated through conversion by adopting the first permutation vector.
The signal modulation module is used for modulating the four paths of parallel signals applying vector disturbance to generate four modes of optical signals with the same height, consistent optical path length and the same polarization direction, and sending the optical signals to the optical signal receiving module through the ring core optical fiber.
The optical signal receiving module is used for sequentially carrying out sorting and filtering processing on the received optical signals in the four modes and converting the optical signals into four paths of parallel signals again.
And the receiving end digital signal processing module generates a reverse second permutation vector at the receiving end through chaotic mapping, performs inverse vector disturbance on the received four paths of parallel signals by adopting the second permutation vector, and decrypts the received four paths of parallel signals into one path of four 16CAP symbols in an original sequence.
The work flow of the whole code modulation system is as follows:
in the system, a first serial-parallel conversion unit 01, a 16CAP mapping unit 02, a second serial-parallel conversion unit 03, a vector disturbance unit 04, a first key generation unit 05 and a chaotic mapping unit 06 form a sending end digital signal processing module, an original pseudo random sequence (PRBS) is converted into four parallel signals through serial-parallel conversion, then 16CAP mapping is carried out, the four parallel signals are converted into one signal after mapping, and the one signal is divided into four signals through one serial-parallel conversion and then is transmitted in four different orthogonal modes. Before digital-to-analog conversion, the four signals are subjected to vector disturbance by a permutation vector generated by a secret key and Rochester chaotic mapping, so that the encryption process is completed.
In the system, an arbitrary waveform transmitter 07, a laser 08, a mach-zehnder modulator 09, an erbium-doped fiber amplifier 10, a collimating mirror 11, a reflecting mirror 12, a spatial light modulator 13, a reflecting mirror group 14, a reflecting mirror group 15, a reflecting mirror group 16, a polarizing beam splitter 17, a polarizing beam splitter 18, a polarizing plate 19, a polarizing plate 20, a quarter wave plate 21, a polarizing plate 22 and a collimating mirror 23 form a signal modulation module, synchronous digital-to-analog conversion of four paths of signals is realized through an arbitrary waveform transmitter (AWG), then modulation of the signals is completed through a mach-zehnder modulator (MZM), spatial light modulation is performed through an erbium-doped fiber amplifier (EDFA) and the collimating mirror, and then the signals are injected into a Spatial Light Modulator (SLM) through the reflecting mirror to generate optical signals in different orthogonal modes, and finally, optical paths of the four modes are respectively adjusted through a series of reflecting mirror group, mach-zehnder modulator and polarizing beam splitter, so that the optical paths are equal in height and the optical path lengths are the same and the polarization directions are ensured to be the same. And the modulated optical signal is driven into the ring core optical fiber again through the collimating mirror for transmission.
In this system, a collimator 25, a 4f system 26, a mode sorter 27, a variable optical attenuator 28, an EDFA29, an optical band-pass filter 30, a photodiode 31, and an oscilloscope 32 constitute an optical signal receiving module. After the signal is transmitted by the ring core optical fiber, all output modes of the optical fiber are converted into linear polarization states through a quarter-wave plate and imaged into a mode sorter through a 4f system, so that signal light of the four modes is separated, and each path of signal passes through a variable optical attenuator, an EDFA and an optical band-pass filter and then is input into a Photodiode (PD) and then is received in an oscilloscope.
In the system, an inverse vector perturbation unit 33, a third parallel-to-serial conversion unit 34, a demapping unit 35, a fourth parallel-to-serial conversion unit 36, a signal output unit 37, a chaotic demapping unit 38, and a second key generation unit 39 form a receiving-end digital signal processing module, so that demapping and decryption of signals are realized. Four paths of signals received by the oscilloscope, chaotic mapping and a secret key are utilized to complete reverse vector disturbance of a receiving end, chaotic decryption of the signals is achieved, then 16CAP demapping is carried out on the decrypted signals, and finally the received real signals can be restored through parallel-serial conversion again.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily defined to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be defined by the appended claims.
Claims (8)
1. A high-safety orthogonal mode division multiplexing access method based on vector disturbance is characterized in that the access method comprises the following steps:
the method comprises the steps that a chaotic encryption technology based on vector disturbance is adopted at a sending end and a receiving end, signals transmitted under each orthogonal mode are changed through the vector disturbance, different orthogonal modes are controlled by utilizing chaotic sequences, and the encryption and decryption processes of the signals in an orthogonal mode multiplexing system are completed;
the access method comprises the following steps:
s1, performing serial-to-parallel conversion on every four 16CAP symbols generated by a sending end, and converting one path of signal into four paths of parallel signals in a balanced manner;
s2, generating a first permutation vector through Rochester chaotic mapping; the method specifically comprises the following substeps:
s21, generating a Rochester chaotic sequence, wherein the Rochester chaotic sequence conforms to a rule of uniform distribution from 0 to 1;
s22, processing the Rochester chaotic sequence generated by chaotic mapping, converting the Rochester chaotic sequence into a first permutation vector, wherein the first permutation vector obtained by conversion is a long vector containing four integers of 1, 2, 3 and 4 and can be cut into any length, the occurrence rule of each number is disordered and unsettable, and the probability of each number is the same as the total probability of each number;
s3, applying vector disturbance to the four paths of parallel signals generated by conversion in the step S1 by adopting the first displacement vector;
s4, transmitting the four paths of parallel signals to a receiving end in four modes in a new randomly generated arrangement mode;
s5, generating a second opposite permutation vector at the receiving end through chaotic mapping;
and S6, carrying out inverse vector disturbance on the four received parallel signals by adopting a second permutation vector, and decrypting the four received parallel signals into four 16CAP symbols in one path in the original sequence.
2. The vector perturbation based high-security orthogonal mode division multiplexing access method according to claim 1 wherein in step S4, said new arrangement includes 24 different transmission sequences from mode one, mode two, mode three, mode four to mode four, mode three, mode two, mode one.
3. The vector perturbation-based high-safety orthogonal mode division multiplexing access method according to claim 1, wherein in step S21, the process of generating the rochester chaotic sequence comprises the following steps:
s211, setting two parameters required by generating the Rochester chaotic sequence: an initial value X (0) and a parameter u;
s212, by system equation: x (k + 1) = u X (k) × [1-X (k) ], (k =0,1, \8230;, n) are iterated, generating a string of chaotic sequences, wherein the rochester function operates in a chaotic state when 0-but X (0) <1 and 3.5699456.
4. The vector perturbation-based high-safety orthogonal mode division multiplexing access method according to claim 1, wherein the process of processing the Rochester chaotic sequence generated by the chaotic mapping and converting the Rochester chaotic sequence into the first permutation vector comprises the following steps:
processing the chaos sequence generated by the chaos mapping by adopting the following formula:
x′(k)＝round[3*x(k)]+1
in the formula, x' (k) is the generated permutation vector, x (k) is the chaotic sequence, and k is the iteration number.
5. The vector perturbation based high-security orthogonal mode division multiplexing access method according to claim 1 wherein each of the orthogonal modes adopted by the orthogonal mode multiplexing system is a ring mode, different modes are different in size, and the orthogonal modes are multiplexed together by a multiplexer and then transmitted through a ring core optical fiber.
6. A high-security orthogonal mode division multiplexing access system for realizing the high-security orthogonal mode division multiplexing access method based on vector disturbance of claim 1 is characterized in that the access system comprises a sending end digital signal processing module, a signal modulation module, a ring core optical fiber, an optical signal receiving module and a receiving end digital signal processing module which are connected in sequence;
the sending end digital signal processing module is used for carrying out series-parallel conversion on every four 16CAP symbols generated by the sending end, converting one path of signals into four paths of parallel signals in a balanced manner, generating a first permutation vector through Rochester chaotic mapping, and applying vector disturbance to the four paths of parallel signals generated by conversion by adopting the first permutation vector;
the signal modulation module is used for modulating four paths of parallel signals applying vector disturbance to generate optical signals of four modes which are coaxial and equal in height, consistent in optical path length and identical in polarization direction, and sending the optical signals to the optical signal receiving module through the ring core optical fiber;
the optical signal receiving module is used for sequentially carrying out sorting and filtering processing on the received optical signals in the four modes and converting the optical signals into four paths of parallel signals again;
and the receiving end digital signal processing module generates an opposite second permutation vector at a receiving end through chaotic mapping, performs inverse vector disturbance on the received four paths of parallel signals by adopting the second permutation vector, and decrypts the received four paths of parallel signals into one path of four 16CAP symbols in an original sequence.
7. The high-security orthogonal mode division multiplexing access system of the vector perturbation based high-security orthogonal mode division multiplexing access method according to claim 6, wherein the sending end digital signal processing module comprises a first serial-parallel conversion unit, a 16CAP mapping unit, a second serial-parallel conversion unit, a first key generation unit, a chaotic mapping unit and a vector perturbation unit;
the device comprises a first serial-parallel conversion unit, a 16CAP mapping unit, a second serial-parallel conversion unit and a vector disturbance unit which are sequentially connected, wherein the first serial-parallel conversion unit is used for converting an original pseudo-random sequence into four parallel signals through serial-parallel conversion and outputting the four parallel signals to the 16CAP mapping unit, the 16CAP mapping unit is used for performing 16CAP mapping on the received four parallel signals, converting the four parallel signals into one signal and outputting the signal to the second serial-parallel conversion unit, and the second serial-parallel conversion unit is used for performing serial-parallel conversion on the received signal, dividing the signal into four and dividing the signal into four different orthogonal modes for transmission;
the first key generation unit is used for generating an encryption key and sending the encryption key to the chaotic mapping unit, the chaotic mapping unit is used for generating a first displacement vector through Rochester chaotic mapping, and the vector perturbation unit is used for applying vector perturbation to four parallel signals output by the second serial-to-parallel conversion unit by adopting the first displacement vector and sending the four parallel signals with the vector perturbation to the signal modulation module;
the receiving end digital signal processing module comprises an inverse vector perturbation unit, a second key generation unit, a chaotic demapping unit, a third parallel-serial conversion unit, a demapping unit, a fourth parallel-serial conversion unit and a signal output unit;
the second key generation unit is used for generating a decryption key and sending the decryption key to the chaotic demapping unit, the chaotic demapping unit is used for generating a second permutation vector through Rochester chaotic demapping, and the inverse vector perturbation unit is used for performing inverse vector perturbation on the received four-path parallel signals by adopting the second permutation vector, decrypting the received four-path parallel signals into one-path four 16CAP symbols in an original sequence, and achieving chaotic decryption of the signals; the third parallel-to-serial conversion unit, the demapping unit, the fourth parallel-to-serial conversion unit and the signal output unit are sequentially connected, and are used for performing 16CAP demapping on the decrypted signal, restoring the original signal through parallel-to-serial conversion, and outputting the original signal through the signal output unit.
8. The high-safety orthogonal mode division multiplexing access system of the vector disturbance-based high-safety orthogonal mode division multiplexing access method according to claim 6, wherein the signal modulation module comprises an arbitrary waveform transmitter, a Mach-Zehnder modulator, an erbium-doped fiber amplifier, a first collimating mirror, a reflecting mirror, a spatial light modulator, a light path adjusting unit and a second collimating mirror which are connected in sequence;
the random waveform transmitter carries out synchronous digital-to-analog conversion on four paths of signals, outputs the conversion result to the Mach-Zehnder modulator to complete the modulation of the signals, the modulated signals sequentially pass through the erbium-doped optical fiber amplifier, the first collimating mirror and the reflecting mirror and are emitted into the spatial light modulator to be subjected to spatial light modulation so as to generate optical signals in different orthogonal modes, the generated optical signals in different orthogonal modes are adjusted through the optical path adjusting unit to enable the optical signals to be coaxial and equal in height, consistent in optical path length and same in polarization direction, and finally the adjusted optical signals are sent to the ring-core optical fiber through the second collimating mirror to be transmitted;
the optical signal receiving module comprises a quarter-wave plate, a 4f system, a mode selector, a four-path optical signal processing unit and an oscilloscope which are connected in sequence; each path of the optical signal processing unit comprises a variable optical attenuator, an erbium-doped optical fiber amplifier, an optical band-pass filter and a photodiode which are connected in sequence;
the optical signals of the four modes are converted into linear polarization states through the quarter-wave plate respectively, the linear polarization states are imaged into the mode sorter through the 4f system, the signal light of the four modes is separated, and each path of optical signal is connected into the oscilloscope to be received after being filtered through one path of optical signal processing unit.
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