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Orbital angular momentum modes do not increase the channel capacity in communication links
KTH, School of Engineering Sciences (SCI), Applied Physics. (AlbaNova)
KTH, School of Engineering Sciences (SCI), Applied Physics. (AlbaNova)
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Electronics and Quantum Optics, QEO.ORCID iD: 0000-0002-2082-9583
2015 (English)In: New Journal of Physics, ISSN 1367-2630, Vol. 17, 043040Article in journal (Refereed) Published
Abstract [en]

The orbital momentum of optical or radio waves can be used as a degree of freedom to transmit information. However, mainly for technical reasons, this degree of freedom has not been widely used in communication channels. The question is if this degree of freedom opens up a new, hitherto unused 'communication window' supporting 'an infinite number of channels in a given, fixed bandwidth' in free space communication as has been claimed? We answer this question in the negative by showing that on the fundamental level, the mode density, and thus room for mode multiplexing, is the same for this degree of freedom as for sets of modes lacking angular momentum. In addition we show that modes with angular momentum are unsuitable for broadcasting applications due to excessive crosstalk or a poor signal-to-noise ratio.

Place, publisher, year, edition, pages
2015. Vol. 17, 043040
Keyword [en]
orbital angular momentum, mode density, spectral efficiency, free-space communication, broadcasting, signal-to-noise ratio, crosstalk
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-169360DOI: 10.1088/1367-2630/17/4/043040ISI: 000353939200003OAI: diva2:820709

QC 20150612

Available from: 2015-06-12 Created: 2015-06-12 Last updated: 2015-06-12Bibliographically approved

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