Wan Yibin, Ren Jianxin, Liu Bo, Mao Yaya, Chen Shuaidong, Wu Xiangyu, Li Ying, Wu Yongfeng, Zhao Lilong, Sun Tingting, Ullah Rahat
Opt Lett. 2022 Jun 1;47(11):2903-2906. doi: 10.1364/OL.460052.
In this Letter, we propose a secure orthogonal frequency division multiplexing (OFDM) transmission scheme based on chaotic encryption and noise-masking key distribution. With the implementation of a three-dimensional digital chaotic system, the security performance is effectively enhanced by scrambling the phase, symbol, and subcarrier frequency of the OFDM signal. The proposed noise-masking key distribution can mask the key information of the chaotic system into noise and transmit it with the chaotic encrypted signal simultaneously. By this mechanism, the legal receiver can realize uninterrupted authentication and decryption even if the key is constantly updated. Transmission of a 62.2-Gb/s quadrature phase shift keying (QPSK) and 124.4-Gb/s 16 quadrature amplitude modulation (16QAM) OFDM signal over a 2-km 7-core fiber using the proposed scheme is experimentally demonstrated. The results show that the proposed scheme can realize security enhancement and cost-effective key distribution without significant bit error ratio (BER) performance degradation.
在本信函中，我们提出了一种基于混沌加密和噪声掩蔽密钥分发的安全正交频分复用（OFDM）传输方案。通过实现三维数字混沌系统，OFDM信号的相位、符号和子载波频率被加扰，从而有效提高了安全性能。所提出的噪声掩蔽密钥分发能够将混沌系统的密钥信息掩蔽到噪声中，并与混沌加密信号同时传输。通过这种机制，即使密钥不断更新，合法接收方也能够实现不间断的认证和解密。利用所提方案在2千米长的7芯光纤上对62.2Gb/s的正交相移键控（QPSK）和124.4Gb/s的16正交幅度调制（16QAM）OFDM信号进行传输的实验得到了验证。结果表明，所提方案能够在不显著降低误码率（BER）性能的情况下实现安全增强和经济高效的密钥分发。
