Multiplexed vortex state array toward high-dimensional data multicasting

Optical vortex array has drawn widespread attention since the boom of special applications such as molecular selecting and optical communication. Here, we propose an integrated phase-only scheme to generate multiple multiplexed vortex beams simultaneously, constituting a multiplexed vortex state array, where the spatial position, as well as the corresponding orbital angular momentum (OAM) spectrum, can be manipulated flexibly as desired. Proof-of -concept experiments are carried out and show a few different multiplexed vortex state arrays that fit well with the simulation. Moreover, regarding the array as a data-carrier, a one-to-many multicasting link through multi-state OAM shift keying, a high-dimensional data coding, is also available in free space. In the experiment, four various OAM states are employed and achieve four bits binary symbols, and finally distribute three different images to three separate receivers independently from the same transmitter, showing great potential in the future high-dimensional optical networks.

Automated summary

In this study, an integrated phase-only scheme is proposed to generate multiple multiplexed vortex beams simultaneously, forming a multiplexed vortex state array. Proof-of-concept experiments show good agreement with simulations, validating the feasibility of the proposed scheme. Additionally, the scheme can be used for high-dimensional data coding and enables one-to-many multicasting links in free space, demonstrating the potential for future optical networks.