Reveals that OAM multiplexing does not reach capacity limits in free-space channels, suggesting alternatives.
Orbital angular momentum (OAM) modes have been proposed for multiplexing information in fibers and free-space links. We show that OAM multiplexing does not realize the capacity limits of free-space channels, and is outperformed by multiplexing in parallel Gaussian beams or in any complete modal basis.
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Kahn et al. (2016) studied this question.
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