Photonics Research, 2019, 7 (11): 11001306, Published Online: Oct. 30, 2019   

High-speed optical secure communication with external noise source and internal time-delayed feedback loop Download: 663次

Author Affiliations
National Engineering Laboratory for Next Generation Internet Access System (NGIA), School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST), Wuhan 430074, China
Abstract
We propose and experimentally demonstrate a novel physical layer encryption scheme for high-speed optical communication. A 10 Gb/s on-off keying signal is secretly transmitted over 100 km standard single-mode fiber. The intensity-modulated message is secured by the encryption mechanism, which is composed of an external noise source and an internal time-delayed feedback loop. The external noise serves as an entropy source with sufficient randomness. The feedback loop structure in the transmitter introduces a time-domain encryption key space, and a corresponding open-loop configuration at the receiver side is used for synchronization and decryption. Experiment results show the effectiveness of the proposed scheme. For a legitimate terminal, bit error rate below 10 8 can be obtained. Decryption degradations with the mismatch of different hardware parameters are researched. The time delay in the feedback loop provides a sensitive encryption key. For other hardware parameters, the system is robust enough for synchronization. Meanwhile, the time-delay signature of the loop is able to be well concealed by the external noise. Moreover, the proposed scheme can support density wavelength division multiplexing transmission with a relatively simple structure. This work also provides a new concept to establish optical secure communication by combining a time-delayed feedback chaotic system and random noise.

Yudi Fu, Mengfan Cheng, Xingxing Jiang, Quan Yu, Linbojie Huang, Lei Deng, Deming Liu. High-speed optical secure communication with external noise source and internal time-delayed feedback loop[J]. Photonics Research, 2019, 7(11): 11001306.

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