CN112911423B - Safe optical interconnection system and method based on three-dimensional disturbance and elastic optical network - Google Patents

Safe optical interconnection system and method based on three-dimensional disturbance and elastic optical network Download PDF

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CN112911423B
CN112911423B CN202011547930.0A CN202011547930A CN112911423B CN 112911423 B CN112911423 B CN 112911423B CN 202011547930 A CN202011547930 A CN 202011547930A CN 112911423 B CN112911423 B CN 112911423B
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CN112911423A (en
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刘博�
忻向军
任建新
毛雅亚
唐荣
王瑞春
沈磊
吴泳锋
孙婷婷
赵立龙
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Nanjing University of Information Science and Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
    • 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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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
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Abstract

The invention discloses a safe optical interconnection system and a safe optical interconnection method based on three-dimensional disturbance and an elastic optical network. The algorithm has a simple structure, and due to the three-time combined encryption, an attacker needs to obtain three different chaotic mapping sequences to decrypt by using the scheme, so the reliability degree is quite high. And the elastic optical network structure can distribute reasonable bandwidth resources according to the flow of the transmission signal, thereby meeting the dynamic service requirement, improving the utilization rate of the bandwidth, and being an ideal choice in the scheme for enhancing the system safety and flexibility in the chaotic optical communication system.

Description

Safe optical interconnection system and method based on three-dimensional disturbance and elastic optical network
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a safe optical interconnection system and method based on three-dimensional disturbance and an elastic optical network.
Background
The passive optical network is an advanced defense scheme for solving the problem that the next generation of multi-user access network has high requirement on bandwidth, and the Orthogonal Frequency Division Multiplexing (OFDM) has strong anti-multipath interference capability and is widely applied to wired and wireless systems. Therefore, under the push of increasing data transmission requirements of modern optical communication systems, an orthogonal frequency division multiplexing passive optical network (OFDM-PON) has become a method for meeting the requirements of next-generation networks due to its high spectrum utilization rate, dispersion tolerance, low bandwidth requirement, multipath interference resistance, and high signal transmission capability. Meanwhile, the demand for information sharing is increasing, so that communication security becomes the focus of attention.
The conventional OFDM-PON encryption technology is generally directed to an upper layer, and a signal transmitted by a physical layer is transparent to an eavesdropper. Thus, the system is vulnerable to an attacker. Physical layer encryption has attracted a great deal of research interest in order to improve the security of OFDM-PONs based on digital signal processing.
In recent years, many physical layer security schemes for optical communication have been proposed. The chaotic system has been widely used as a security encryption scheme in the electronic and optical fields because of its high pseudo-randomness, unpredictability and sensitivity to initial values. Encryption techniques in the optical field include chaotic laser communication and exclusive or interference. Digital signal processing related encryption techniques used in wireless communication systems are based on chaos and hyperchaos, and encryption algorithms are generally classified into symmetric encryption algorithms and asymmetric encryption algorithms. The british mathews proposed a modified Logistic mapping in 1989, and designed a cipher scheme based on the generated chaotic sequence, so that many scholars began to study the generation of ciphers based on the chaotic pseudo-random sequence. The chaotic system is extremely sensitive to initial conditions, even if the initial conditions are slightly different, the motion trajectories of the chaotic system are completely different through iteration of a chaotic equation, and the result is pseudo-random, so that the symmetric encryption condition is met.
In addition, as the demand for bandwidth continues to increase, the fixed grid Wavelength Division Multiplexing (WDM) originally specified by the International Telecommunications Union (ITU) has a significantly reduced utility as the modulation rate increases, failing to meet the high-rate, high-capacity communication demand. Even with a wide enough spectral bandwidth to satisfy higher rate signals, the higher rate signals are difficult to transmit far enough at higher spectral efficiency, which requires that the transmitter dynamically adjust the transmission rate and spectral efficiency to suit the network environment and bandwidth requirements. In addition to improving spectral efficiency, a greater impact comes from newly built data centers to diversify network requirements, with both traffic uncertainty and small-granularity traffic demand and large-granularity traffic demand. To meet this challenge well, a flexible, adaptive, variable bandwidth transceiver and network element is needed to meet this flexible traffic demand. In communication devices of 100GB/s and above, it has been considered to merge multiple-granularity networks together to provide an adaptive variable-grid intelligent network node, i.e., a "resilient" optical network. Although the high-order modulation method can significantly improve the spectrum utilization rate, the limitation of the transmission distance is large. The multi-carrier transmitting and receiving solution, the dynamic optical arbitrary waveform generation technology and the like all rely on a low-speed modulator to generate a plurality of low-speed subcarriers to form a broadband data spectrum, so that a high-speed data stream can be realized by a plurality of low-speed electrical signals. OFDM-based elastic optical networks can offer finer granularity than wavelength division multiplexed optical networks, but are much larger than the granularity of optical packet switching, and are therefore considered a compromise between them before optical packet switching is not fully mature.
In order to further enhance the safety and the scalability of the optical interconnection communication system and reduce the bandwidth, the low-dimensional single chaotic system is improved, the variable parameters of the low-dimensional single chaotic system are increased, and an elastic optical network method is introduced, so that the optical interconnection system can obtain a larger key space, the exhaustive attack is effectively resisted, the spectrum utilization rate is improved, and diversified network requirements are met. Based on the theory, the patent provides a safe optical interconnection method based on three-dimensional disturbance and an elastic optical network.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a system and a method for secure optical interconnection based on three-dimensional perturbation and elastic optical network, which encrypt the sub-carrier, symbol and mode of the signal respectively by using a self-iterative improved Logistic chaotic system, and then transmit the encrypted sub-carrier, symbol and mode into an optical network structure for packet transmission. The algorithm has a simple structure, and due to the three-time combined encryption, an attacker needs to obtain three different chaotic mapping sequences to decrypt by using the scheme, so the reliability degree is quite high. And the elastic optical network structure can distribute reasonable bandwidth resources according to the flow of the transmission signal, thereby meeting the dynamic service requirement, improving the utilization rate of the bandwidth, and being an ideal choice in the scheme for enhancing the system safety and flexibility in the chaotic optical communication system.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a safe optical interconnection system based on three-dimensional disturbance and an elastic optical network comprises a data encryption unit, a key generation unit, a data decryption unit and an elastic optical network unit;
the data encryption unit encrypts the information and transmits the information to the elastic optical network unit;
the elastic optical network unit realizes information exchange;
a data decryption unit at a receiving end receives the information and then performs decryption and recombination;
the key generation unit generates a scrambling matrix.
In order to optimize the technical scheme, the specific measures adopted further comprise:
the elastic optical network unit adopts an optical interconnection structure formed inside a cascaded cabinet cluster and among the cabinet clusters by 8 multiplied by 8 micro mechanical optical switches, continuous light with central frequency intervals emitted by two lasers is input to the input end of an optical frequency comb generator after passing through a coupler, and the optical frequency comb generator is subjected to phase modulation through an external radio frequency source to obtain flat optical comb subcarriers, wherein each beam of continuous light generates an optical comb with subcarrier intervals having the same frequency as that of the external radio frequency source.
At a receiving end, optical frequency combs generated by an optical comb generator are used as local oscillation light to carry out coherent detection, an optical mixer and two pairs of balanced detectors are used for respectively realizing frequency mixing and signal detection of an optical Single Carrier Frequency Division Multiplexing (SCFDM) signal, and then off-line digital signal processing is used for carrying out decryption and receiving on the OFDM signal.
The key generation unit generates and divides a scrambling matrix by using a self-iterative improved Logistic chaotic system, and the scrambling matrix is respectively used for scrambling symbols, subcarriers and modes of signals.
A safe optical interconnection method based on three-dimensional disturbance and an elastic optical network comprises the following steps:
step 1: carrying out Quadrature Amplitude Modulation (QAM) symbol mapping and OFDM modulation on bit data streams from users, and respectively mapping the data of the users to respective OFDM subcarriers;
step 2: performing chaotic mapping by using a self-iterative improved Logistic chaotic system to obtain a scrambling vector, and performing chaotic scrambling on a subcarrier of a signal to realize data encryption;
and step 3: after encryption is finished, modulating the OFDM signal to a time domain by using IFFT and scrambling and encrypting OFDM symbols by using a symbol scrambling vector;
and 4, step 4: modulating a signal onto an optical carrier, then carrying out mode scrambling, transmitting the signal into an elastic optical network unit, and carrying out dynamic bandwidth allocation transmission by the unit according to data flow and then reaching a receiving end;
and 5: the receiving end firstly decrypts and recombines the mode by using the secret key, mixes the light of different frequency spectrums transmitted by the elastic optical network unit by using an optical mixer, decrypts and recombines OFDM symbols after completing photoelectric conversion, modulates OFDM signals to a frequency domain by using FFT, and recombines and decrypts OFDM subcarriers; and then extracting and separating the data of each user from the sub-carriers, realizing data decryption and recombination, finally processing the baseband signals through parallel-to-serial conversion to recover the original data, and sending the original data to each user.
The step 2 of performing chaos mapping by using the self-iterative improved Logistic chaotic system comprises the following steps:
step 2.1: generating a chaotic sequence by using a self-iterative improved Logistic chaotic system for symbols, subcarriers and patterns, wherein the Logistic chaotic system is defined as follows:
Figure GDA0003036638460000031
wherein, the initial value x 0 E (0,1), bifurcation parameter μ =3.61234;
in order to keep good chaotic characteristic, the avalanche effect of the chaotic system is increased by using the value generated after the equation (1) is iterated for 200 times, and better safety is obtained;
step 2.2: recording a scrambling matrix generated by the Logistic chaotic system as L, generating a scrambling matrix R of NxN order of 0-1, and recording as:
Figure GDA0003036638460000041
where N is the number of OFDM subcarriers. Each row in the matrix is not identical and there is only one "β" per row;
will be beta in each row ik As a new scrambling factor, is recorded as r j Is R j-1 The correct subscript of "β" for each row in (a) is noted as:
R j ＝{r 1 ,r 2 ,…,r j }j＝1,2,…,N (3)
divide x ∈ (0,1) into Q sub-intervals, numbered 1-Q to get f (Q), noted as:
Figure GDA0003036638460000042
where Q is an integer representing the iteration step. The length of the f (q) sub-field being the iteration interval l f . Q can vary from 1-N depending on the ONU needs, and in formula (3), R j Representing the position of the initial iteration value, taking the midpoint value of each subdomain as the initial iteration value of the new chaotic map, as follows:
Figure GDA0003036638460000043
r is to be j For sub-domain mapping, the new initial stackThe representative values are:
Figure GDA0003036638460000044
step 2.3: will I j The elements in (1) are taken as initial values to generate a scrambling matrix, and I is the chaotic characteristic of an improved Logistic algorithm j The method is an unpredictable parameter, the step length and the initial value are given, and the self-iterative chaotic mapping is continuously carried out until all sub-domains are traversed;
step 2.4: dividing a scrambling matrix D generated after the self-iterative chaotic mapping is finished into different matrix blocks D 1 ,D 2 ,D 3 For symbol, subcarrier, and mode scrambling, respectively.
In step 2, the OFDM signal without pre-masking is represented as:
Figure GDA0003036638460000045
wherein c is k QAM mapped symbol representing the k-th subcarrier, f k Frequency of the kth subcarrier;
using matrix D 1 Obtaining OFDM subcarrier scrambling vector M C The following formula:
Figure GDA0003036638460000051
wherein H = [1,2, …, N]To ensure at M C No repeated value of D 2 T Representation pair matrix D 2 Performing transposition;
the masked OFDM signal is represented as:
Figure GDA0003036638460000052
the invention has the following beneficial effects:
the invention provides a dynamic disturbance encryption scheme of subcarriers, symbols and modes aiming at the physical layer security of OFDM, which is different from the traditional encryption mode, carries out self-iteration on an improved Logistic chaotic algorithm to generate different scrambling matrixes, increases the complexity of a key source and the encryption performance of a system, can realize flexible spectrum exchange and real-time dynamic bandwidth allocation of optical carriers, and is an effective scheme serving as a future high-capacity multi-carrier high-security optical interconnection system.
The method is based on the combination of chaotic secret optical communication and an elastic optical network framework, uses a self-iterative improved Logistic chaotic system to generate different scrambling parameters to perform scrambling encryption on subcarriers, symbols and modes in a communication system respectively, and generates a decryption sequence at a receiving end by using a scrambling vector to decrypt after the transmission of the elastic optical network; due to the characteristics of the chaotic system and the independent operability of the subcarriers, the communication system can obtain a larger safe key space, has good illegal receiving resistance, greatly improves the safety of user communication, can improve the bandwidth utilization rate of the system through flexible bandwidth allocation transmission, and can be used as a practical scheme of future large-capacity optical multicarrier communication.
Drawings
FIG. 1 is a model of a secure optical interconnection system based on three-dimensional perturbation and elastic optical network;
FIG. 2 is a self-iterative improved Logistic chaotic system model;
FIG. 3 is a schematic diagram of subcarrier and symbol scrambling;
FIG. 4 is a schematic diagram of mode scrambling;
fig. 5 is a schematic diagram of a flexible optical network.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
The invention discloses a safe optical interconnection system based on three-dimensional disturbance and an elastic optical network, which is shown in figure 1: the device comprises a data encryption unit, a key generation unit, a data decryption unit and an elastic optical network unit;
the data encryption unit encrypts the information and transmits the information to the elastic optical network unit;
the elastic optical network unit realizes information exchange;
a data decryption unit at a receiving end receives the information and then carries out decryption recombination;
the key generation unit generates a scramble matrix.
In the embodiment, the elastic optical network unit adopts an optical interconnection structure formed inside a cascaded cabinet cluster and among the cabinet clusters by adopting 8 × 8 micro mechanical optical switches, continuous light with a central frequency interval emitted by two lasers is input to the input end of an optical frequency comb generator after passing through a coupler, and the optical frequency comb generator is subjected to phase modulation by an external radio frequency source to obtain flat optical comb subcarriers, wherein each beam of continuous light generates an optical comb with the subcarrier interval identical to the frequency of the external radio frequency source.
In the embodiment, at a receiving end, an optical frequency comb generated by an optical comb generator is used as local oscillation light to perform coherent detection, an optical mixer and two pairs of balanced detectors are used to respectively realize frequency mixing and signal detection of an optical Single Carrier Frequency Division Multiplexing (SCFDM) signal, and then offline digital signal processing is used to perform decryption and reception of the OFDM signal.
In an embodiment, the key generation unit generates and divides a scrambling matrix by using a self-iterative improved Logistic chaotic system, and the scrambling matrix is respectively used for scrambling symbols, subcarriers and modes of signals.
The whole three-dimensional composite light vector disturbing signal transmission system has the working process that: the method comprises the following steps:
step 1: carrying out Quadrature Amplitude Modulation (QAM) symbol mapping and OFDM modulation on bit data streams from users, and mapping the data of the users to respective OFDM subcarriers respectively;
step 2: performing chaotic mapping by using a self-iterative improved Logistic chaotic system to obtain a scrambling vector, and performing chaotic scrambling on a subcarrier of a signal to realize data encryption;
and 3, step 3: after encryption is finished, modulating the OFDM signal to a time domain by using IFFT and scrambling and encrypting OFDM symbols by using a symbol scrambling vector;
and 4, step 4: modulating a signal onto an optical carrier, then carrying out mode scrambling, transmitting the signal into an elastic optical network unit, and carrying out dynamic bandwidth allocation transmission by the unit according to data flow and then reaching a receiving end;
and 5: the receiving end firstly decrypts and recombines the mode by using the secret key, mixes the light of different frequency spectrums transmitted by the elastic optical network unit by using an optical mixer, decrypts and recombines OFDM symbols after completing photoelectric conversion, modulates OFDM signals to a frequency domain by using FFT, and recombines and decrypts OFDM subcarriers; and then extracting and separating the data of each user from the sub-carriers, realizing data decryption and recombination, finally processing the baseband signals through parallel-to-serial conversion to recover the original data, and sending the original data to each user.
As shown in fig. 2, the chaos mapping step using the self-iterative improved Logistic chaotic system in step 2 is as follows:
step 2.1: generating a chaotic sequence by using an improved Logistic chaotic system after self-iteration for symbols, subcarriers and modes, wherein the Logistic chaotic system is defined as follows:
Figure GDA0003036638460000071
wherein, the initial value x 0 E (0,1), bifurcation parameter μ =3.61234;
in order to keep good chaotic characteristic, the avalanche effect of the chaotic system is increased by using the value generated after the equation (1) is iterated for 200 times, and better safety is obtained;
step 2.2: recording a scrambling matrix generated by the Logistic chaotic system as L, generating a scrambling matrix R of NxN order of 0-1, and recording as:
Figure GDA0003036638460000072
where N is the number of OFDM subcarriers. Each row in the matrix is not identical and there is only one "β" per row;
can convert beta in each row ik As a new scramblingFactor, denoted as r j Is R j-1 The correct subscript of "β" for each row in (a) is noted as:
R j ＝{r 1 ,r 2 ,…,r j } j＝1,2,…,N (3)
divide x ∈ (0,1) into Q sub-intervals, numbered 1-Q to get f (Q), noted as:
Figure GDA0003036638460000073
where Q is an integer representing the iteration step. The length of the f (q) sub-field being the iteration interval 1 f . Q may vary from 1-N depending on the ONU needs, and in formula (3), R j And representing the position of the initial iteration value, and taking the midpoint value of each subdomain as the initial iteration value of the new chaotic mapping, wherein the position is as follows:
Figure GDA0003036638460000074
r is to be j For subdomain mapping, the new initial iteration value can then be expressed as:
Figure GDA0003036638460000075
step 2.3: will I j The elements in (1) are taken as initial values to generate a scrambling matrix by the formula (1) mapping, and I is the chaotic characteristic of the improved Logistic algorithm j The method is an unpredictable parameter, the step length and the initial value are given, and the self-iterative chaotic mapping is continuously carried out until all sub-domains are traversed;
step 2.4: dividing a scrambling matrix D generated after the self-iterative chaotic mapping is finished into different matrix blocks D 1 ,D 2 ,D 3 For symbol, subcarrier, and mode scrambling, respectively.
In the embodiment, in step 2, the OFDM signal without pre-masking is represented as:
Figure GDA0003036638460000081
wherein c is k QAM mapped symbol representing the k sub-carrier, f k Is the frequency of the kth subcarrier;
using matrix D 1 Obtaining OFDM subcarrier scrambling vector M C The following formula:
Figure GDA0003036638460000082
wherein H = [1,2, …, N]To ensure at M C No repeated value of D 2 T Representation pair matrix D 2 Performing transposition;
the masked OFDM signal is represented as:
Figure GDA0003036638460000083
OFDM symbol masking vector M S Sum mode masking vector M M Are respectively composed of matrix blocks D 2 ,D 3 Obtaining, calculating method and M C The same is true. The encrypted data stream is decrypted at the receiver using the scrambling matrix in the same process as at the sender. It is difficult to extract data from the signal without knowing the initial values and the iteration steps. The encryption scrambling herein employs a Digital Signal Processing (DSP) method without any additional optical module.
OFDM subcarrier and symbol scrambling:
it can be considered that the data frame structure of OFDM is output after pre-masking, as shown in fig. 3, where horizontal and vertical directions respectively represent subcarriers and symbols of an OFDM signal, and the original input subcarriers and symbols are scrambled by using a scrambling matrix, respectively, and an encrypted OFDM signal is output.
Mode scrambling:
in fig. 4, the circular rings are five mutually orthogonal modes, which are mode 1, mode 2, mode 3, mode 4 and mode 5 from inside to outside, and the arrows with different gray levels are shown to modulate signals onto the modes corresponding to the dotted lines. When not scrambled, signals 1-5 are modulated onto corresponding modes respectively; after scrambling using the scrambling vector, signals 1-5 are modulated onto mode 3, mode 4, mode 5, mode 1 and mode 2, respectively.
An elastic optical network unit:
an optical interconnection structure between the interior of a cascaded cabinet cluster and the cabinet cluster is formed by 8 multiplied by 8 micro mechanical optical switches, continuous light with central frequency intervals emitted by two lasers is input to the input end of an optical frequency comb generator after passing through a coupler, the optical frequency comb generator is subjected to phase modulation through an external radio frequency source, flat optical comb subcarriers are obtained, and each beam of continuous light generates an optical comb with subcarrier intervals having the same frequency as the external radio frequency source. Modulating the generated optical comb sub-carrier, loading the encrypted OFDM signal onto the optical comb sub-carrier after the modulation by an erbium-doped fiber amplifier (EDFA), amplifying by the EDFA, and then entering an optical network unit for transmission.
At a receiving end, optical frequency combs generated by an optical comb generator are used as local oscillation light to carry out coherent detection, and an optical mixer and two pairs of balanced detectors are used for respectively realizing frequency mixing and signal detection of an optical Single Carrier Frequency Division Multiplexing (SCFDM) signal. The decrypted reception of the OFDM signal is then performed using off-line digital signal processing.
The generated SCFDM signal is used for simulating the service generated by the cabinet top switch, and the signal is divided into different subcarrier groups and simultaneously switched to different cabinet top switches, and the Multiple Input Multiple Output (MIMO) mode is realized by switching the subcarriers through a spectrum selection switch. In FIG. 1, nodes A, B, C and D represent micro-mechanical optical switches MEMS-1, MEMS-2, and MEMS-4, respectively. The switching node E is responsible for the exchange of information between the two data centers. The coupler, the spectrum selection switch and the optical fiber circulator form a multiplexing/demultiplexing & spectrum selection switch module for realizing more flexible switching function. Services can be converged on light through a coupler to realize unified switching, and an input signal can be subjected to spectrum selection through a spectrum selection switch to switch different spectrums to required destination ports. By adding the multiplexing/demultiplexing and spectrum selection switch module, the function that the same cabinet top end switch communicates with a plurality of cabinet top end switches at the same time is realized.
If the ant flow occupies a smaller bandwidth and has a shorter duration, the ant flow can be modulated onto a single carrier based on SCFDM; for large-granularity switching such as elephant flow, point-to-multipoint routing communication, multipoint-to-single point routing communication and the like with large bandwidth occupation and long duration, the carrier waves with continuous low bandwidth occupation can be modulated according to the switching requirement of the service, and the requirement of the service is met through the switching of the photon carrier granularity. Therefore, different services (ant flow and elephant flow) can be distributed to different transmitters, and by distributing reasonable bandwidth resources, dynamic service requirements can be met, and the utilization rate of bandwidth is improved.
Through three times of calculation, the value of each corresponding position of the original data is randomly scrambled, and the encryption performance and the security are further improved by using self-iterative improved Logistic chaotic system mapping as a random source.
As shown in fig. 5, when traffic is allocated in a conventional manner, bandwidth is wasted. For example, the wavelengths of 40G and 10G may be separately allocated to the service 1 and the service 2, and the service 3 is transmitted by using the wavelengths allocated with 3 40G, so that bandwidth resources cannot be fully utilized because the protection bandwidth existing between the wavelengths cannot carry the service. In the elastic optical network, assuming that each OFDM subcarrier can carry a service of 10G size, service 1 and service 2 can be respectively carried by using 2 and 1 subcarriers, and for a large-capacity service 3, 12 continuous carriers can be aggregated into a very large wavelength for transmission. The elastic optical network not only provides variable granularity, but also eliminates the frequency grid concept in the WDM network, so that large data services can be transmitted by using a large wavelength, and bandwidth resources are saved.
The receiving end uses an optical mixer to mix the light of different frequency spectrums transmitted by the elastic optical network unit, and uses a digital signal processing unit to decrypt the encrypted OFDM signal after photoelectric conversion. The demodulation and decryption process is the inverse process of the sending end, and the subcarrier, the symbol and the mode scrambling key sequence can be obtained through the initial values and the algorithm of the formulas (1) - (9) for recombination and decryption.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.

Claims (5)

1. A safe optical interconnection system based on three-dimensional disturbance and an elastic optical network is characterized by comprising a data encryption unit, a key generation unit, a data decryption unit and an elastic optical network unit;
the data encryption unit encrypts the information and transmits the information to the elastic optical network unit;
the elastic optical network unit realizes information exchange;
a data decryption unit at a receiving end receives the information and then carries out decryption recombination;
a key generation unit generates a scrambling matrix;
the key generation unit generates and divides a scrambling matrix by using a self-iterative improved Logistic chaotic system, and the scrambling matrix is respectively used for scrambling symbols, subcarriers and modes of signals, and specifically comprises the following steps:
generating a chaotic sequence by using an improved Logistic chaotic system after self-iteration for symbols, subcarriers and modes, wherein the Logistic chaotic system is defined as follows:
Figure FDA0003995633540000011
wherein, the initial value x 0 Epsilon (0,1), and a branching parameter mu =3.61234;
in order to keep good chaotic characteristic, the avalanche effect of the chaotic system is increased by using the value generated after the equation (1) is iterated for 200 times, and better safety is obtained;
recording a scrambling matrix generated by the Logistic chaotic system as L, generating a scrambling matrix R of NxN order of 0-1, and recording as:
Figure FDA0003995633540000012
where N is the number of OFDM subcarriers; each row in the matrix is not identical and there is only one "β" per row;
will be beta in each row ik As a new scrambling factor, denoted as r j Is R j-1 The correct subscript of "β" for each row in the list, as:
R j ＝{r 1 ,r 2 ,…,r j } j＝1,2,…,N (3)
divide x ∈ (0,1) into Q sub-intervals, numbered 1-Q to get f (Q), noted as:
Figure FDA0003995633540000013
wherein Q is an integer representing the iteration step; the length of the f (q) sub-field being the iteration interval l f (ii) a Q varies from 1-N according to the ONU requirements, in formula (3), R j Representing the position of the initial iteration value, taking the midpoint value of each subdomain as the initial iteration value of the new chaotic map, as follows:
Figure FDA0003995633540000021
r is to be j For subdomain mapping, the new initial iteration value is then expressed as:
Figure FDA0003995633540000022
will I j The elements in (1) are taken as initial values to generate a scrambling matrix, and I is the chaotic characteristic of an improved Logistic algorithm j The method is an unpredictable parameter, step length and an initial value are given, and self-iterative chaotic mapping is continuously carried out until all sub-domains are traversed;
dividing a scrambling matrix D generated after the self-iterative chaotic mapping is finished into different matrix blocks D 1 ,D 2 ,D 3 For symbol, subcarrier, and mode scrambling, respectively.
2. The system as claimed in claim 1, wherein the elastic optical network unit employs 8 × 8 micro mechanical optical switches to form an optical interconnection structure between an interior of a cascaded cabinet cluster and the cabinet cluster, two lasers emit continuous light with a center frequency interval, the continuous light is input to an input end of the optical frequency comb generator after passing through the coupler, and the optical frequency comb generator is subjected to phase modulation by an external radio frequency source to obtain a flat optical comb subcarrier, where each continuous light generates an optical comb with a subcarrier interval identical to the frequency of the external radio frequency source.
3. The system according to claim 1, wherein at a receiving end, coherent detection is performed by using an optical comb generated by an optical comb generator as local oscillator light, and frequency mixing and signal detection of the optical single carrier frequency division multiplexing signal are respectively performed by using an optical mixer and two pairs of balanced detectors, and then the OFDM signal is decrypted and received by using offline digital signal processing.
4. The method according to any one of claims 1 to 3, comprising:
step 1: carrying out orthogonal amplitude modulation symbol mapping and OFDM modulation on bit data streams from users, and mapping the data of the users to respective OFDM subcarriers;
step 2: performing chaotic mapping by using a self-iterative improved Logistic chaotic system to obtain a scrambling vector, and performing chaotic scrambling on a subcarrier of a signal to realize data encryption;
and step 3: after encryption is completed, modulating the OFDM signal to a time domain by using IFFT and scrambling and encrypting OFDM symbols by using a symbol scrambling vector;
and 4, step 4: modulating a signal onto an optical carrier, then carrying out mode scrambling, transmitting the signal into an elastic optical network unit, and carrying out dynamic bandwidth allocation transmission by the unit according to data flow and then reaching a receiving end;
and 5: the receiving end firstly decrypts and recombines the mode by using the secret key, mixes the light of different frequency spectrums transmitted by the elastic optical network unit by using an optical mixer, decrypts and recombines OFDM symbols after completing photoelectric conversion, modulates OFDM signals to a frequency domain by using FFT, and recombines and decrypts OFDM subcarriers; and then extracting and separating the data of each user from the sub-carriers, realizing data decryption and recombination, finally processing the baseband signals through parallel-to-serial conversion to recover the original data, and sending the original data to each user.
5. The method according to claim 4, wherein in step 2, the OFDM signal without pre-masking is represented as:
Figure FDA0003995633540000031
wherein c is k QAM mapped symbol representing the k sub-carrier, f k Is the frequency of the kth subcarrier;
using matrix D 2 Obtaining OFDM subcarrier scrambling vector M C The following formula:
Figure FDA0003995633540000032
wherein H = [1,2, …, N]To ensure at M C In the presence of a non-repeating value,
Figure FDA0003995633540000033
representation pair matrix D 2 Performing transposition;
the masked OFDM signal is represented as:
Figure FDA0003995633540000034
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