High-capacity millimetre-wave communications with orbital angular momentum multiplexing

Yan Yan (), Guodong Xie, Martin P. J. Lavery, Hao Huang, Nisar Ahmed, Changjing Bao, Yongxiong Ren, Yinwen Cao, Long Li, Zhe Zhao, Andreas F. Molisch, Moshe Tur, Miles J. Padgett and Alan E. Willner ()
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Yan Yan: University of Southern California
Guodong Xie: University of Southern California
Martin P. J. Lavery: School of Physics and Astronomy, University of Glasgow
Hao Huang: University of Southern California
Nisar Ahmed: University of Southern California
Changjing Bao: University of Southern California
Yongxiong Ren: University of Southern California
Yinwen Cao: University of Southern California
Long Li: University of Southern California
Zhe Zhao: University of Southern California
Andreas F. Molisch: University of Southern California
Moshe Tur: School of Electrical Engineering, Tel Aviv University
Miles J. Padgett: School of Physics and Astronomy, University of Glasgow
Alan E. Willner: University of Southern California

Nature Communications, 2014, vol. 5, issue 1, 1-9

Abstract: Abstract One property of electromagnetic waves that has been recently explored is the ability to multiplex multiple beams, such that each beam has a unique helical phase front. The amount of phase front ‘twisting’ indicates the orbital angular momentum state number, and beams with different orbital angular momentum are orthogonal. Such orbital angular momentum based multiplexing can potentially increase the system capacity and spectral efficiency of millimetre-wave wireless communication links with a single aperture pair by transmitting multiple coaxial data streams. Here we demonstrate a 32-Gbit s−1 millimetre-wave link over 2.5 metres with a spectral efficiency of ~16 bit s−1 Hz−1 using four independent orbital–angular momentum beams on each of two polarizations. All eight orbital angular momentum channels are recovered with bit-error rates below 3.8 × 10−3. In addition, we demonstrate a millimetre-wave orbital angular momentum mode demultiplexer to demultiplex four orbital angular momentum channels with crosstalk less than −12.5 dB and show an 8-Gbit s−1 link containing two orbital angular momentum beams on each of two polarizations.

Date: 2014
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DOI: 10.1038/ncomms5876

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