Cui Jie, Liu Bo, Ren Jianxin, Mao Yaya, Wu Xiangyu, Chen Shuaidong, Zhao Linong, Li Ying, Guo Zeqian, Zhou Shuyu, Xu Dongdong, Jiang Lei, Zhang Juntao
Opt Express. 2023 Nov 6;31(23):38640-38652. doi: 10.1364/OE.504520.
In this paper, we propose a high-security three-dimensional optical transmission system utilizing time-frequency-space interleaving chaos, which simultaneously enhances the reliability and security of the system. The four-wing 3D chaos model encrypts the time-frequency space interleaved modulation domain of a orthogonal time-frequency space (OTFS) modulation signal and the modulated phase information simultaneously, improving the system's security. We also experimentally validate the proposed high-security 3D-OTFS method, utilizing the hexadecimal modulation technique. The modulated OTFS signal achieves a transmission rate of 34.1 Gb/s over a 2-km seven-core fiber link, with the OTFS signal exhibiting a maximum of 1.31 dB receiver sensitivity gain compared to orthogonal frequency division multiplexing (OFDM) signals under the forward error correction threshold of the bit error rate. The achieved keyspace is equal to 5 × 10. The findings demonstrate that the proposed high-security three-dimensional optical transmission mechanism, based on time-frequency-space interleaved disruption, exhibits excellent anti-interference ability and confidentiality performance. Consequently, it holds promising prospects for future applications in optical communications.
在本文中，我们提出了一种利用时频空交织混沌的高安全性三维光传输系统，该系统同时提高了系统的可靠性和安全性。四翼3D混沌模型对正交时频空（OTFS）调制信号的时频空交织调制域和调制相位信息进行加密，提高了系统的安全性。我们还利用十六进制调制技术对所提出的高安全性3D-OTFS方法进行了实验验证。调制后的OTFS信号在2公里的七芯光纤链路上实现了34.1 Gb/s的传输速率，与在误码率的前向纠错阈值下的正交频分复用（OFDM）信号相比，OTFS信号的接收灵敏度增益最大为1.31 dB。实现的密钥空间等于5×10。研究结果表明，所提出的基于时频空交织干扰的高安全性三维光传输机制具有优异的抗干扰能力和保密性能。因此，它在光通信的未来应用中具有广阔的前景。
