Demonstration of high-dimensional free-space data coding/decoding through multi-ring optical vortices
Multi-ring optical vortices are a kind of structured beams that carry orbital angular momentum (OAM) and have concentrical doughnut intensity distributions. In this paper, we present both theoretically and experimentally a scheme that employing 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 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 4 radial indices are present. And the coding/decoding performance when facing various atmosphere turbulence is evaluated. Furthermore, a 64×64 gray image (totally 32768 bits) is also transmitted through multi-ring optical vortices coding in free-space successfully, showing good transmission performance.
Fu Shiyao,Zhai Yanwang,Zhou Heng,Zhang Jianqiang,Yin Ci,Gao Chunqing. Demonstration of high-dimensional free-space data coding/decoding through multi-ring optical vortices[J].Chinese Optics Letters,2019,17(8):08.