The Limits of Effective Degrees of Freedom in UCA based Orbital Angular Momentum Multiplexed Communications.

Abstract:

:Orbital angular momentum (OAM) multiplexing technique has recently emerged and generated widespread interests since the OAM was discovered as a property of electromagnetic wave and acoustic wave. It was widely acknowledged that OAM multiplexing can achieve very high effective degrees of freedom (EDOF) and improve the spectral efficiency in optical, radio and acoustic communications. However, in the field of free-space optical (FSO) communications, it was demonstrated that OAM multiplexing is not the optimal multiplexing technique and the spatial bandwidth product (SBP) limits the EDOF. Is there any EDOF limits of OAM multiplexing in radio and acoustic communications? Could OAM multiplexing be safely scaled to far field? Here, we discover that the azimuthal resolution of OAM mode generator in OAM multiplexing limits its EDOF. Furthermore, we also verify that the OAM multiplexing in radio and acoustic communication fails to enable a long distance transmission and high EDOF simultaneously incurred by the inherently imperfect OAM mode generator.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Li Z,Qu F,Wei Y,Yang G,Xu W,Xu J

doi

10.1038/s41598-020-61329-z

subject

Has Abstract

pub_date

2020-03-23 00:00:00

pages

5216

issue

1

issn

2045-2322

pii

10.1038/s41598-020-61329-z

journal_volume

10

pub_type

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