Vortex Waves and Channel Capacity: Hopes and Reality
arXiv:1901.05857 · doi:10.1109/ACCESS.2017.2786467
Abstract
Several recent contributions have envisioned the possibility of increasing currently exploitable maximum channel capacity of a free space link, both at optical and radio frequencies, by using vortex waves, i.e. carrying Orbital Angular Momentum (OAM). Our objective is to disprove these claims by showing that they are in contradiction with very fundamental properties of Maxwellian fields. We demonstrate that the Degrees of Freedom (DoF) of the field cannot be increased by the helical phase structure of electromagnetic vortex waves beyond what can be done without invoking this property. We also show that the often-advocated over-quadratic power decay of OAM beams with distance does not play any fundamental role in the determination of the channel DoF.
arXiv comment8 pages, 7 figures
References in corpus (11)
- Entanglement of Orbital Angular Momentum States of Photons
- Utilization of photon orbital angular momentum in the low-frequency radio domain
- Quantum Entanglement of High Angular Momenta
- Encoding many channels in the same frequency through radio vorticity: first experimental test
- Experimental high-dimensional two-photon entanglement and violations of generalised Bell inequalities
- Communication with spatially modulated Light through turbulent Air across Vienna
- Twisting of light around rotating black holes
- Photon Orbital Angular Momentum in Astrophysics
- Superpositions of the Orbital Angular Momentum for Applications in Quantum Experiments
- Comment on 'Encoding many channels on the same frequency through radio vorticity: first experimental test'
- Further Comment on 'Encoding many channels on the same frequency through radio vorticity: first experimental test'
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- Approaching the Fundamental Limit of Orbital Angular Momentum Multiplexing Through a Hologram Metasurface
- Holographic MIMO Communications exploiting the Orbital Angular Momentum
- Circularly Symmetric Light Waves: An Overview