A highly secure and reliable optical orthogonal frequency division multiplexing passive optical network (OFDM-PON) based on the chaos encryption inside polar code scheme is proposed. The 3-dimensional Chua's circuit model is adopted to realize chaotic encryption during polar encoding with low complexity. The three chaotic sequences generated by Chua's circuit model are used to encrypt information index bit matrix, frozen bits (during polar encoding) and subcarrier sequence, respectively. The BER and security performance of the optical transmission system are enhanced by our method. A 70 Gb/s polar encoded encrypted 16 quadrature amplitude modulation OFDM signal transmission over a 2 km seven-core fiber is further experimentally demonstrated. The experimental results show that the polar encoded encrypted 16 QAM-OFDM obtains a 2.1 dB gain in receiver sensitivity at a BER of 10−3 under the same bit rate compared to the normal 16 QAM-OFDM without FEC. Moreover, the key space of the proposed scheme is 1084, which is large enough to guard against any malicious attacks from illegal ONUs effectively. The combined superiority of BER and security performance enable such OFDM-PON based on chaos encryption inside polar code, to have a high prospect of application in low-cost and reliable optical access system.

中文翻译：

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基于Polar码内混沌加密的高度安全可靠的7芯光纤OFDM接入系统


提出了一种基于极化码内部混沌加密方案的高度安全可靠的光正交频分复用无源光网络（OFDM-PON）。采用3维蔡氏电路模型实现极性编码时的混沌加密，复杂度低。 Chua电路模型生成的三个混沌序列分别用于加密信息索引位矩阵、冻结位（在极性编码期间）和子载波序列。我们的方法增强了光传输系统的误码率和安全性能。进一步实验证明了 70 Gb/s 极性编码加密 16 正交幅度调制 OFDM 信号在 2 km 七芯光纤上的传输。实验结果表明，与没有 FEC 的普通 16 QAM-OFDM 相比，在相同比特率下，极性编码加密 16 QAM-OFDM 在 BER 为 10−3 时获得了 2.1 dB 的接收灵敏度增益。此外，该方案的密钥空间为1084，足够大，可以有效防范非法ONU的恶意攻击。误码率和安全性能的综合优势使得这种基于Polar码内部混沌加密的OFDM-PON在低成本、可靠的光接入系统中具有广阔的应用前景。