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.
We demonstrate a multi-wavelength Q-switched random fiber laser with the erbium-doped fiber as the gain medium and the Rayleigh scattering as the randomly distributed feedback in a 6 km long single-mode fiber. Q-switched pulses and sub-pulses with different repetition frequencies were generated with the pump power as 182 mW by combining the random cavity resonances and the Q-value modulation effect induced by the stimulated Brillouin scattering and nonlinear multimode interference in the graded-index multimode fiber. The pulse repetition rate increased continuously from 79 kHz to 113 kHz, and the corresponding pulse width exponentially decreased with the continuously increasing pump power, and a shortest pulse width of 1.85 μs was obtained. At the same time, a multi-wavelength spectrum with the equally spaced interval and an optical signal-to-noise ratio of ~31 dB was achieved. This laser has the unique properties different from the conventional resonant cavity lasers, which makes it a very promising light source in optical communication, imaging, and sensing applications.
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