Nima Ashrafi

TL;DR: In this article, the authors review recent progress in OAM beam generation/detection, multiplexing/demultiplexing, and its potential applications in different scenarios including free-space optical communications, fiber-optic communications, and RF communications.

TL;DR: In this paper, the trade-offs for different transmitted beam sizes, receiver aperture sizes, and mode spacing of the transmitted OAM beams under given lateral displacements or receiver angular errors were investigated.

TL;DR: Both experimental and simulation results show that power penalties increase rapidly when the displacement increases, and the influence of channel impairments on the received power, intermodal crosstalk among channels, and system power penalties is investigated.

TL;DR: In this paper, a plurality of composite data streams are generated by overlaying the first data subs-layer with the second data sub-layers at a preconfigured overlay offset.

TL;DR: This work experimentally demonstrates an 80 Gbit/s FSO system with a 2×2 aperture architecture, in which each transmitter aperture contains two multiplexed data-carrying OAM modes, indicating that OAM and MIMO-based spatial multiplexing could be simultaneously utilized, thereby providing the potential to enhance system performance.