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.
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