Abstract
Beams carrying orbital-angular-momentum (OAM) have gained much interest due to their unique amplitude and phase structures. In terms of communication systems, each of the multiple independent data-carrying beams can have a different OAM value and be orthogonal to all other beams. This paper will describe the use of multiplexing and the simultaneous transmission of multiple OAM beams for enhancing the capacity of communication systems. We will highlight the key advances and technical challenges in the areas of (a) free-space and fiber communication links, (b) mitigation of modal coupling and channel crosstalk effects, (c) classical and quantum systems, and (d) optical and radio frequency beam multiplexing.
Highlights
AND OVERVIEWIn 1992, Allen et al.1 reported that orbital angular momentum (OAM) can be carried by an optical vortex beam
Such structured beams are a subset of the Laguerre–Gaussian (LGlp) modal basis set in free space, which has two modal indices: (1) l represents the number of 2π phase shifts in the azimuthal direction and the size of the ring grows with l and (2) p + 1 represents the number of concentric amplitude rings
These multiplexed orthogonal OAM beams are a form of mode-division multiplexing (MDM), which itself is a subset of space-division multiplexing (SDM)
Summary
In 1992, Allen et al. reported that orbital angular momentum (OAM) can be carried by an optical vortex beam. The number of 2π phase changes in the azimuthal direction represents the OAM mode order, and beams with different OAM values can be orthogonal to each other (Fig. 1) Such structured beams are a subset of the Laguerre–Gaussian (LGlp) modal basis set in free space, which has two modal indices: (1) l represents the number of 2π phase shifts in the azimuthal direction and the size of the ring grows with l and (2) p + 1 represents the number of concentric amplitude rings.. Such structured beams are a subset of the Laguerre–Gaussian (LGlp) modal basis set in free space, which has two modal indices: (1) l represents the number of 2π phase shifts in the azimuthal direction and the size of the ring grows with l and (2) p + 1 represents the number of concentric amplitude rings.2,3 This orthogonality enables multiple independent optical beams to be multiplexed, spatially co-propagate, and be demultiplexed—all with minimal inherent crosstalk.. To explore more about this, see the references at the end
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