REVIEW | doi:10.20944/preprints201808.0355.v1
Subject: Engineering, Electrical & Electronic Engineering Keywords: Orbital angular momentum; free-space optical communications; turbulence mitigation
Online: 20 August 2018 (12:34:41 CEST)
We review recent progress in high-speed orbital angular momentum (OAM) multiplexed free-space optical communication systems. The outdoor atmospheric turbulence is emulated by an indoor turbulence emulator, which is based on split-step beam propagation method. Adaptive optics, channel coding, Huffman coding combined with LDPC coding, and spatial offset are used for turbulence mitigation; while OAM multiplexing and wavelength-division multiplexing (WDM) are applied to boost aggregate capacity.