A general optical network endogenous security protection system based on quantum noise stream encryption

Abstract

The application discloses a kind of general optical network endogenous security protection system based on quantum noise flow encryption, belong to optical communication, optical network technical field.The application is aimed at the demand of multiple modulation formats of flexible optical transport network, in the sending node of OTN, with the transmitter of general modulation format from binary phase shift keying (BPSK) to sixty-four modulation formats (64QAM) format change, the transmitter is mainly composed of the above-mentioned modulation format digital signal processing part, continuous wave laser and quadrature phase modulator.In the receiving node of OTN, with modulation format identification module from BPSK to 64QAM and the module based on each modulation format phase noise sets different quantization threshold limit to generate seed key.Based on the above fiber channel features, the seed key generated by receiver is negotiated and expanded, the physical layer quantum noise flow encryption of optical network is realized, so that the security problem in existing flexible optical network is effectively solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of optical communication and optical network, and particularly relates to a multi-modulation format general optical network endogenous security protection system based on quantum noise flow encryption. BACKGROUND

[0002] In order to meet the huge service demand of 5G and super 5G mobile network access technology, advanced optical transport network (OTN) data transmission technology based on dense wavelength division multiplexing (DWDM) plays a vital role in providing appropriate infrastructure. However, the OTN physical layer can be illegally accessed by intruders or any unauthorized third party at the physical layer link of the optical network. At present, the industry has carried out various analysis and research on the security protection of the physical layer of the optical network, one of which takes the implementation of quantum noise flow encryption as the breakthrough point. And the industry is also concerned about the quantum noise flow encryption optical network security method based on endogenous characteristics.

[0003] However, there is no endogenous security analysis and transmission performance analysis of general modulation format in the OTN system at present. SUMMARY

[0004] The application proposes a general optical network endogenous security protection system based on quantum noise flow encryption for the scene based on general multi-modulation format, which can realize the transmission between services in the OTN system and solve the information security problem in the OTN.

[0005] In order to achieve the above purpose, the technical scheme adopted by the application is as follows:

[0006] A general optical network endogenous security protection system based on quantum noise flow encryption is applied to a flexible next-generation optical transport network. The sending node of the optical transport network comprises a data source module, a mapping module of different modulation formats, a resampling module, a pre-distortion module, an electro-optical modulation module, an obtained seed key module and a running key module. The receiving node of the optical transport network comprises an optoelectronic modulation module, a receiver clock synchronization module, a filter equalization module, a modulation format identification module, and a frequency offset and phase offset estimation module, a symbol demapping module and a system security and transmission performance analysis module for each modulation format. Wherein, there is spontaneous emission noise of quantum coherent state noise on the fiber channel.

[0007] A software-defined controller controls the sending node and the receiving node of the flexible optical transport network. Wherein, the software-defined controller controls the mapping of the original data in the sending node of the optical transport network to different modulation formats, the number and value of the tap coefficients in the pre-distortion module, the tap coefficients of the equalizer in the receiver, the identification of different modulation formats at the receiving end, and the frequency offset and phase offset estimation parameters for different modulation formats.

[0008] The working mode of the system is as follows:

[0009] (1) extracting the variation of the frequency of the phase offset for different modulation formats;

[0010] (2) according to the channel signal-to-noise ratio requirement of different modulation formats, selecting different double-threshold quantization quantization thresholds, setting the quantization threshold parameters of the frequency offset and phase offset estimation module;

[0011] (3) according to the quantization criterion, based on the relationship between the bit error rate of optical transmission and the generation rate of the key, the optical phase noise is quantized into a "0", "1" bit sequence, and the seed key generation is completed;

[0012] (4) the generated seed key is sent to the transmitting node of the optical transport network again, and the comparison of the two ends is carried out according to the detected seed key, so that the negotiation of the seed key is realized.

[0013] The beneficial effects of the present application are:

[0014] 1、The present application is aimed at different modulation formats, first discriminates the modulation format at the receiving end, then quantizes the phase noise, sets the threshold value of the phase noise quantization according to the discriminated modulation format, can realize the efficient transmission of the service in the OTN system, and solves the information security problem in the OTN.

[0015] 2、The present application is aimed at the demand of the elastic OTN multi-modulation format, and has a general modulation format transmitter which changes from binary phase shift keying (BPSK) to sixty-four-order quadrature amplitude modulation (64QAM) format in the transmitting node of the OTN. The transmitter is mainly composed of the digital signal processing part of the above-mentioned modulation format, the continuous wave laser (LD) and the quadrature phase (IQ) modulator. In the receiving node, there is a modulation format identification module from BPSK to 64QAM and a seed key generation module based on the phase noise of each modulation format. After the generated seed key is expanded, the physical layer quantum noise stream encryption is realized, so that the security problem in the existing optical network is solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the principle schematic diagram of the system of the present application.

[0017] Figure 2 It is the principle schematic diagram of the quantum noise stream encryption based on the present application.

[0018] Figure 3 It is the phase noise quantization flow chart for the multi-modulation format of the present application. DETAILED DESCRIPTION

[0019] In order to make the skilled in the art better understand the technical scheme of the present application, the present application will be further described in detail below with reference to the drawings.

[0020] Referring to Figure 1 A general optical network endogenous security protection system based on quantum noise flow encryption, including an OTN sending communication node, an OTN receiving communication node, an optical fiber transmission channel, and a software-defined controller.

[0021] The OTN sending communication node includes a data source module, a mapping module for different modulation formats, a resampling module, a pre-distortion module, and an electro-optical modulation module, a seed key acquisition module, and a running key module. Different data source modules correspond to different modulation format mapping modules; the resampling module is to ensure consistency with the data acquisition rate of the receiving end; the pre-distortion module mainly compensates for the transmitter for linear damage in the channel link. The electro-optical modulation module realizes optical transmission of different modulation formats.

[0022] There is quantum coherent state noise on the optical fiber transmission channel, such as amplifier spontaneous emission noise (ASE).

[0023] The OTN receiving communication node includes an optoelectronic modulation module, a receiver clock synchronization module, a filter equalization module, a modulation format identification module, and a frequency offset and phase offset estimation module for different modulation formats, a demapping module, and a system security and transmission performance analysis module.

[0024] The software-defined controller controls the flexible OTN sending node and the OTN receiving node. The software-defined controller controls the mapping of the original data in the OTN sending node to different modulation formats, the tap coefficients in the pre-distortion module, the tap coefficients of the equalizer in the receiver, the identification of different modulation formats in the receiving end, and the frequency offset and phase offset estimation parameters for different modulation formats.

[0025] In the frequency offset and phase offset estimation module for different modulation formats, different frequency offset and phase offset estimation module parameters are set for different modulation formats, such as five modulation formats for BPSK, QPSK, 16QAM, 32QAM, and 64QAM, and the quantization threshold parameters of the frequency offset and phase offset estimation module are set to parameter 1, parameter 2, parameter 3, parameter 4, and parameter 5.

[0026] Referring to Figure 2The basic principle of quantum noise stream encryption includes a mathematical encryption module of plaintext and a seed key and a mathematical decryption module at the receiving end. The seed key is expanded by a pseudo-random number generator (PRNG), and the expanded key acts on a mapper and different modulation format modules. The mapper selects a constellation and then performs electrical driving / amplification, and the amplified electrical signal is then transmitted by an electro-optical modulation module. At the receiving end, the optical signal affected by quantum coherent state noise is first detected by an optical-electrical conversion module, and then the key negotiated with the sending end is used to identify the overall constellation of the signal, so that the different modulation formats are correctly identified, and the corresponding plaintext data is recovered.

[0027] Reference Figure 3 According to the uniqueness and randomness of the optical phase noise in coherent optical transmission, the seed key generation for multiple modulation formats is mainly based on the quantization of the channel phase noise. The generated seed key is sent to the sending end, and the negotiation of the seed keys generated at the receiving and sending ends is realized.

[0028] In the system, different modulation formats have different signal-to-noise ratios (SNRs), and the existing quantization method is the classical double-threshold algorithm, and the quantization threshold is determined according to the SNR transmitted in the frequency range. The optical phase noise is a quantity that changes with frequency. The quantization threshold is adaptively selected according to the extracted initial optical phase value that changes with frequency. According to the quantization criterion, the relationship between the bit error rate (BER) of optical transmission and the generation rate of the key is comprehensively considered, and the optical phase noise is finally quantized into a "0" and "1" bit sequence, i.e. a seed key.

[0029] The present application aims at the demand of multiple modulation formats of the optical transport network (OTN). In the sending node of the OTN, there is a transmitter with a general modulation format changing from binary phase shift keying (BPSK) to sixty-four-order quadrature amplitude modulation (64QAM). The transmitter is mainly composed of a digital signal processing part of the above-mentioned modulation format, a continuous wave laser (LD), and an in-quadrature phase (IQ) modulator. In the receiving communication node of the OTN, there is a modulation format identification module from BPSK to 64QAM and a module for generating a seed key by setting different quantization threshold limits based on the phase noise of each modulation format. Based on the characteristics of the above-mentioned fiber channel, the seed key generated by the receiver is negotiated and expanded, and the physical layer quantum noise stream encryption of the optical network is realized, thereby solving the security problem in the existing flexible optical network.

[0030] In conclusion, the application realizes a multi-modulation format general optical network endogenous security protection system based on quantum noise stream encryption, and realizes a security protection method based on different optical channel characteristic quantization under different modulation formats through a simple and easy-to-implement method.

[0031] The above merely describes specific implementation manners of the present application in the embodiments, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A general optical network endogenous security protection system based on quantum noise stream encryption, characterized in that, The application is applied to the next generation of elastic optical transport network. The sending node of the optical transport network comprises a data source module, a mapping module of different modulation formats, a resampling module, a pre-distortion module, an electro-optical modulation module, a seed key obtaining module and a running key module. The receiving node of the optical transport network comprises an optical-electric modulation module, a receiver clock synchronization module, a filter equalization module, a modulation format identification module and a frequency offset and phase offset estimation module, a demapping module and a system security and transmission performance analysis module for different modulation formats. There is spontaneous emission noise of quantum coherent state noise on the fiber channel. A software defined controller controls the sending node and the receiving node of the elastic optical transport network. The software defined controller controls the mapping of the original data to different modulation formats, the tap coefficient in the pre-distortion module, the tap coefficient of the equalization in the receiver, the identification of different modulation formats at the receiving end, and the parameters of the frequency offset and phase offset estimation for different modulation formats. The working mode of the system is as follows: (1) Extracting the change amount of the phase offset with the frequency for different modulation formats; (2) According to the channel signal-to-noise ratio requirement of different modulation formats, selecting different double-threshold quantization method quantization thresholds, setting the quantization threshold parameters of the frequency offset and phase offset estimation module; (3) According to the quantization criterion, quantizing the optical phase noise into "0" and "1" bit sequences based on the relationship between the bit error rate of optical transmission and the generation rate of the key, and completing the generation of the seed key; (4) Sending the generated seed key to the sending node of the optical transport network again, comparing the seed keys detected at both ends, and realizing the negotiation of the seed key.

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