Abstract
We propose a chaotic region-optimized probabilistic constellation shaping (CRPCS) scheme to enhance the security and the resistance to turbulence for free-space optical (FSO) communications. For this approach, a four-dimensional hyperchaotic system generates a pseudorandom sequence to rotate and encrypt the constellation. Constellation distribution of short pseudorandom sequences behaves as the law of a non-uniform character. Grouping long pseudorandom sequences and counting the characteristics of constellation distribution can realize probabilistic constellation shaping with low and fixed redundant information. We demonstrate a 56 Gbyte/s coherent FSO communication system based on log-normal and Gamma–Gamma turbulence models with a key space of 1075. The results show that the optical receiver sensitivity is improved by 0.3–1.1 dB, and the transmission distance is also improved by 3.2%–7.0% in different shaping cases.
© 2023 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Tingwei Wu, Hanxiang Mou, Yutong He, Yejun Liu, Song Song, Lun Zhao, and Lei Guo
Opt. Express 32(7) 11395-11405 (2024)
Yaoqiang Xiao, Sitao Wang, Zhiyi Wang, Linrong Jiang, and Jing He
Opt. Lett. 48(11) 2989-2992 (2023)
Yiqun Zhang, Mingfeng Xu, Mingbo Pu, Qiang Chen, Mengjie Zhou, Shuangcheng Chen, Kun Qiu, Ning Jiang, and Xiangang Luo
Opt. Lett. 48(6) 1470-1473 (2023)