Research On Optical Network Physical Layer Security Technology Based On Optical Chaos

Optical networks carry a large number of communication services around the world and have the advantages of high speed,broadband,and anti-electromagnetic interference,which are the core base of computing power networks.However,with the advent of the information age,the physical layer of optical networks is vulnerable to more and more attacks due to its transparency.The attacks mainly include illegal eavesdropping for the purpose of information theft,as well as injection attacks for the purpose of interference injection and identity deception.Depending on the attack location and the method,a variety of different attack methods have been derived.Therefore,effective security protection measures must be taken to address serious security issues in the physical layer of optical networks.The optical chaos is widely used in the field of optical network physical layer security due to its characteristics such as noise-like,initial value sensitivity,and unpredictability in the long term.Optical network physical layer security technology based on optical chaos gets rid of the dependence on algorithm complexity and uses the physical properties of chaos to ensure communication security,which is of great significance for realizing high-speed and long-distance secure communication.This paper is oriented to secure communication in the physical layer of optical networks.In view of the security issues existing in the physical layer of optical networks,this paper conducts detailed research on the generation of complex chaos sources,chaotic confidential optical communications,and optical transmitter identity authentication based on chaotic fingerprints.The specific research contents are as follows:(1)Aiming at the problems of low complexity and narrow bandwidth of optical chaos,all-optical chaos based on microcavity optical comb injection and electro-optical chaos based on differential and second-order differential feedback are proposed.For all-optical chaos and electro-optical chaos systems,the broadband complex chaos generation methods are proposed.a)An optical chaos generation method based on microcavity optical comb injection is proposed.A continuous laser is injected into the microring resonator to generate an optical chaotic comb.Then a slave semiconductor laser(SSL)is injected to generate complex chaos.The simulation shows that by controlling the injection power and the frequency of SSL,the optical chaos with permutation entropy(PE)of 0.997 and a bandwidth of 32.4 GHz can be generated.The bandwidth is increased by 5%from COFI.b)A complex chaos generation method based on electro-optical differential feedback is proposed.The cyclic differential calculation is introduced into electro-optical phase feedback chaos to enhance the nonlinearity of the optical chaos.This method realizes the complexity improvement,bandwidth enhancement and time delay signature(TDS)suppression of chaos.The results show that compared with the spectrum of electro-optical phase feedback chaos,the PE of electro-optical differential feedback chaos can reach as high as 0.993,the spectral entropy(SE)is 0.945,and the bandwidth of chaos is 46.75 GHz.c)A chaos generation method based on second-order differential electro-optical feedback loop is proposed,using high-speed digital difference to complete the differential function.The results show that secondorder differential feedback chaos is more complex than first-order differential chaos and has better TDS suppression performance.(2)Aiming at the problems of insufficient security and limited transmission performance of optical chaotic secure communication,a secure optical communication method based on broadband and complex electro-optical feedback chaos is proposed.For single-channel and multiplexed communication systems respectively:a)A secure optical communication method based on electro-optical differential feedback chaos encryption and laser co-drive synchronization is proposed.When the transmitter and receiver parameters match,simultaneously injecting continuous light into two amplitude-phase cascaded electro-optical differential feedback chaos systems can achieve broadband complex chaos synchronization.Long-distance secure optical communication of single-channel high-speed signals is realized through chaos concealment.b)A multi-channel signal confidential optical communication method based on second-order differential electro-optical feedback chaotic mutual injection synchronization is proposed.Using the second-order differential electro-optical feedback chaos mutual injection method,the synchronization of broadband complex chaos is achieved under parameter mismatch and noise interference.The secure optical communication of large-capacity signals is realized by multiplexing phase-encrypted multi-channel signals and filtered chaos.The simulation results show that broadband complex chaos based on second-order differential electro-optical feedback can achieve chaotic synchronization with a synchronization coefficient of 0.919 when the optical signal to noise ratio(OSNR)is 25 dB and the transmission distance is 600 km.Four channels of 25 GBaud 16-QAM signals can achieve safe transmission of 700 km at an OSNR of 25 dB.(3)Aiming at the problem that existing optical transmitter fingerprints are easily intercepted and counterfeited,resulting in insufficient security,a chaotic fingerprint extraction and optical transmitter identity authentication method based on phase space reconstruction is proposed.The phase space reconstruction characteristics of electro-optical feedback chaos are extracted in the experiment.The uniqueness and invariance of the chaotic characteristics were verified,and the chaotic fingerprint was constructed.The optical transmitter authentication methods based on XOR and constellation transformation algorithms are proposed to achieve high-accuracy identification of legal transmitters and illegal optical transmitters.The results show that the identification rate of five optical transmitters is as high as 100%in the transmission of 600 km at the OSNR of 25 dB.This paper aims at eavesdropping and injection attacks in the physical layer of optical networks,conducts in-depth research on the generation of broadband complex chaos,secure optical communication technology based on complex chaos,and optical transmitter identity authentication technology based on chaos fingerprints,and improves the optical network physics layer security.