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Lecture notes in computer science

Physical Layer Security in Optical Networks

Dimitris Syvridis, Evangelos Pikasis, Charidimos Chaintoutis

Published Jan 1, 2020• 3 citations
Publisher
DOI
10.1007/978-3-030-38085-4_35

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Optical network has the characteristics of high speed, large capacity, long distance, and no electromagnetic interference. It is widely used in global information network. More than 90% of the world's information is transmitted through optical network, and has become an important strategic infrastructure of modern information society. Optical network physical layer security is one of the important indicators of optical network communication quality. It represents the ability of the optical network physical layer information to resist human interception and attacks. This paper summarizes the development of physical layer security technology of optical network, including physical layer security system of optical network, optical information protection and optical layer firewall, analyzes the development trend of the technology, and puts forward some suggestions on the development of physical layer security technology of optical network from the perspective of long-term development strategy and recent development focus.
Physical layer security (PLS) is becoming a fundamental requirement in both present and next-generation optical networks, driven by the emerging threat imposed by the immense processing power of quantum computers. To address the need for cost-effective PLS solutions suitable for economically sensitive optical access networks, we have proposed and experimentally demonstrated a DSP-enabled PLS technique offering retrofittable compatibility with existing optical networks and a purely DSP-based solution for seamless digital integration in future communication systems. This paper presents an overview of the proposed techniques, including details of operating principles, experimental validations and investigations, prototype development, and field trials.
Secrecy capacity is usually employed as the performance metric of the physical layer security in fiber-optic wiretap channels. However, secrecy capacity can only qualitatively evaluate the physical layer security, and it cannot quantitatively evaluate the physical layer security of an imperfect security system. Furthermore, secrecy capacity cannot quantitatively evaluate the amount of information leakage to the eavesdropper. Based on the channel model of an optical CDMA network using wiretap code, the information leakage rate is analyzed to evaluate the physical layer security. The numerical results show that the information leakage rate can quantitatively evaluate the physical layer security of an optical CDMA wiretap channel, and it is related to transmission distance, eavesdropping position, confidential information rate and optical code.