Abstract

Multi-ring optical vortices are a kind of structured beams that carry orbital angular momentum (OAM) and have concentrical doughnut intensity distributions. In this Letter, we present both theoretically and experimentally a scheme that employs the dimensions of both the OAM states and radial index of multi-ring optical vortices simultaneously to accomplish high-dimensional free-space data coding/decoding transmissions. Such a scheme can further improve the coding efficiency when limited OAM states are available. In the proof-of-concept experiment, 64-ary coding/decoding employing 16 OAM states and four radial indices are present. Also, the coding/decoding performance when facing various atmosphere turbulences is evaluated. Furthermore, a 64 × 64 gray image (totally, 32,768 bits) is also transmitted through multi-ring optical vortices coding in free-space successfully, showing good transmission performance.

© 2019 Chinese Laser Press

High-dimensional structured light coding/decoding for free-space optical communications free of obstructions

Jing Du and Jian Wang
Opt. Lett. 40(21) 4827-4830 (2015)

Experimental demonstration of free-space multi-state orbital angular momentum shift keying

Shiyao Fu, Yanwang Zhai, Heng Zhou, Jianqiang Zhang, Tonglu Wang, Xueting Liu, and Chunqing Gao
Opt. Express 27(23) 33111-33119 (2019)

Demonstration of free-space one-to-many multicasting link from orbital angular momentum encoding

Shiyao Fu, Yanwang Zhai, Heng Zhou, Jianqiang Zhang, Tonglu Wang, Ci Yin, and Chunqing Gao
Opt. Lett. 44(19) 4753-4756 (2019)

Mixed orbital angular momentum amplitude shift keying through a single hologram

Shiyao Fu, Yanwang Zhai, Ci Yin, Heng Zhou, and Chunqing Gao
OSA Continuum 1(2) 295-308 (2018)

1024-ary composite OAM shift keying for free-space optical communication system decoded by a two-step neural network

Jie Zhu, Minyu Fan, Yonjie Pu, Huinan Li, and Sha Wang
Opt. Lett. 48(10) 2692-2695 (2023)