Physical Layer Encryption of OFDM-PON Based on Quantum Noise Stream Cipher with Polar Code  

作　　者：Xu Yinbo Gao Mingyi Zhu Huaqing Chen Bowen Xiang Lian Shen Gangxiang 

机构地区：[1]Jiangsu Engineering Research Center of Novel Optical Fiber Technology and Communication Network,Suzhou Key Laboratory of Advanced Optical Communication Network Technology,the School of Electronic and Information Engineering,Soochow University,No.1 Shizi Street,Suzhou 215006,China

出　　处：《China Communications》2024年第3期174-188,共15页中国通信（英文版）

基　　金：supported in part by the National Natural Science Foundation of China Project under Grant 62075147;the Suzhou Industry Technological Innovation Projects under Grant SYG202348.

摘　　要：Orthogonal frequency division multiplexing passive optical network(OFDM-PON) has superior anti-dispersion property to operate in the C-band of fiber for increased optical power budget. However,the downlink broadcast exposes the physical layer vulnerable to the threat of illegal eavesdropping. Quantum noise stream cipher(QNSC) is a classic physical layer encryption method and well compatible with the OFDM-PON. Meanwhile, it is indispensable to exploit forward error correction(FEC) to control errors in data transmission. However, when QNSC and FEC are jointly coded, the redundant information becomes heavier and thus the code rate of the transmitted signal will be largely reduced. In this work, we propose a physical layer encryption scheme based on polar-code-assisted QNSC. In order to improve the code rate and security of the transmitted signal, we exploit chaotic sequences to yield the redundant bits and utilize the redundant information of the polar code to generate the higher-order encrypted signal in the QNSC scheme with the operation of the interleaver.We experimentally demonstrate the encrypted 16/64-QAM, 16/256-QAM, 16/1024-QAM, 16/4096-QAM QNSC signals transmitted over 30-km standard single mode fiber. For the transmitted 16/4096-QAM QNSC signal, compared with the conventional QNSC method, the proposed method increases the code rate from 0.1 to 0.32 with enhanced security.

关 键 词：physical layer encryption polar code quantum noise stream cipher 

分 类 号：TN929.1[电子电信—通信与信息系统]