Performance metrics and design considerations for a free-space optical orbital-angular-momentum–multiplexed communication link

By Guodong Xie, Long Li, Yongxiong Ren, Hao Huang, Yan Yan, Nisar Ahmed, Zhe Zhao, Martin P. J. Lavery, Nima Ashrafi, S. Ashrafi and 4 more. 2015

184 citations recorded by the source corpus.

The capacity of free-space optical (FSO) communication links could potentially be increased by the simultaneous transmission of multiple orbital angular momentum (OAM) beams. For such an OAM multiplexing approach, one requires the collection of adequate power as well as proportion of the phase front for a system with minimal crosstalk. Here we study the design considerations for an OAM-multiplexed free-space data link, analyzing the power loss, channel crosstalk, and power penalty of the link in the case of limited-size receiver apertures and misalignment between the transmitter and the receiver. We describe 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. Through simulations and some experiments, we show that (1) a system with a larger transmitted beam size and a larger receiver aperture is more tolerant to lateral displacement but less tolerant to the receiver angular error, and (2) a system with a larger mode spacing, which uses larger OAM charges, suffers more system power loss but less channel crosstalk; thus, a system with a small mode spacing shows a lower system power penalty when system power loss dominates (e.g., a small lateral displacement or receiver angular error), whereas that with a larger mode spacing shows a lower power penalty when channel crosstalk dominates (e.g., a larger lateral displacement or receiver angular error). This work could be beneficial to the practical implementation of OAM-multiplexed FSO links.

Subfields: Atomic and Molecular Physics, and Optics, Biomedical Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/4f80d3fb09a11c31bba55d40dcd8f9c558350173

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Citations in the corpus

Roadmap on structured light (2016, background): “For light of a given wavelength, travelling in a given direction, the prospect of each photon conveying additional information, beyond that afforded by the simple binary basis of polarization, appears highly attractive [16].”
Creation and detection of optical modes with spatial light modulators (2016, background): “Perturbations, such as turbulence impact on performance of such links in free space, and SLMs offer a means to study, characterize, and mitigate such effects [127,128].”
Photon Spin Hall Effect-Based Ultra-Thin Transmissive Metasurface for Efficient Generation of OAM Waves (2019, background): “A few attempts have also been made for realizing high-throughput wireless communication systems based on MIMO combined with OAM waves [12]–[14].”
Ultrathin Complementary Metasurface for Orbital Angular Momentum Generation at Microwave Frequencies (2016, background): “In [8], the parameters that affect the OAM-based MIMO link have been examined with”
Optical Communication in Space: Challenges and Mitigation Techniques (2017, methodology): “For the practical implementation of OAM-based FSO multiplexed system, various design considerations such as beam size, receiver aperture size, mode space of OAM beams for given lateral displacements are analyzed in [405].”