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High-speed optical secure communication with an external noise source and an internal time-delayed feedback loop

查看全文 作　　者：YUDI [1]FU;MENGFAN [1]CHENG;XINGXING [1]JIANG;QUAN [1]YU;LINBOJIE [1]HUANG;LEI [1]DENG;DEMING [1]LIU 高影响力作者 机构地区：[1]National Engineering Laboratory for Next Generation Internet Access System (NGIA), School of Optical and Electronic Information,Huazhong University of Science and Technology (HUST)高影响力机构 出　　处：《Photonics Research》索引2019年第7卷第11期,共8页高影响力期刊 基　　金：National Key R&D Program of China(2018YFB1801304);State Key Laboratory of Advanced Optical Communication Systems and Networks(2019GZKF7);National Natural Science Foundation of China(61505061,61675083);Key Project of RD Program of Hubei Province(2017AAA046) 摘　　要：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 below10-8 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. 关 键 词：COMMUNICATION SYNCHRONIZATION noise
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