Encoding many channels on the same frequency through radio vorticity: first experimental test

We have shown experimentally, in a real-world setting, that it is possible to use two beams of incoherent radio waves, transmitted on the same frequency but encoded in two different orbital angular momentum states, to simultaneously transmit two independent radio channels. This novel radio technique allows the implementation of, in principle, an infinite number of channels in a given, fixed bandwidth, even without using polarization, multiport or dense coding techniques. This paves the way for innovative techniques in radio science and entirely new paradigms in radio communication protocols that might offer a solution to the problem of radio-band congestion.

[1]  High Angle Radiation of Short Electric Waves , 1927, Proceedings of the Institute of Radio Engineers.

[2]  S. Uda.  Radiotelegraphy and Radiotelephony on Half-Meter Waves , 1930, Proceedings of the Institute of Radio Engineers.

[3]  Marconi, the man and his wireless , 1937 .

[4]  Orrin Elmer Dunlap.  Marconi: The Man and His Wireless , 1976 .

[5]  V. B. Berestet͡skiĭ,et al.  Quantum Electrodynamics , 2021, Introduction to Quantum Mechanics.

[6]  H. Yagi,et al.  Beam transmission of ultra short waves , 1928, Proceedings of the IEEE.

[7]  Matti Karjalainen,et al.  A computationally efficient multipitch analysis model , 2000, IEEE Trans. Speech Audio Process..

[8]  Kai Chang,et al.  RF and Microwave Wireless Systems , 2000 .

[9]  A. Vaziri,et al.  Entanglement of the orbital angular momentum states of photons , 2001, Nature.

[10]  Gregor Weihs,et al.  Superpositions of the orbital angular momentum for applications in quantum experiments , 2002 .

[11]  S. Barnett,et al.  Measuring the orbital angular momentum of a single photon. , 2002, Physical review letters.

[12]  D. Grier.  A revolution in optical manipulation , 2003, Nature.

[13]  Martin Harwit,et al.  Photon Orbital Angular Momentum in Astrophysics , 2003, astro-ph/0307430.

[14]  A S Marathay,et al.  Spatial correlation singularity of a vortex field. , 2004, Physical review letters.

[15]  S. Barnett,et al.  Free-space information transfer using light beams carrying orbital angular momentum. , 2004, Optics express.

[16]  Silvia Carrasco,et al.  Digital spiral imaging. , 2005, Optics express.

[17]  G Anzolin,et al.  Overcoming the rayleigh criterion limit with optical vortices. , 2006, Physical review letters.

[18]  Jae Hoon Lee,et al.  Experimental verification of an optical vortex coronagraph. , 2006, Physical review letters.

[19]  C. Barbieri,et al.  Optical vortices with starlight , 2007, 0706.2675.

[20]  H. Then,et al.  Utilization of photon orbital angular momentum in the low-frequency radio domain. , 2007, Physical review letters.

[21]  Fabrizio Tamburini,et al.  Photon wave function: A covariant formulation and equivalence with QED , 2008 .

[22]  M. Beijersbergen,et al.  Method for probing the orbital angular momentum of optical vortices in electromagnetic waves from astronomical objects. , 2008, Physical review letters.

[23]  Nicholas M. Elias.  Photon orbital angular momentum in astronomy , 2008 .

[24]  Ye Geoffrey Li,et al.  Orthogonal Frequency Division Multiplexing for Wireless Communications , 2009 .

[25]  Fabrizio Tamburini,et al.  Twisting of light around rotating black holes , 2011, 1104.3099.

[26]  B. Thidé.  Electromagnetic Field Theory , 2011 .

[27]  Cesare Barbieri,et al.  Radio beam vorticity and orbital angular momentum , 2011 .

[28]  F. Tamburini,et al.  Experimental verification of photon angular momentum and vorticity with radio techniques , 2011 .

[29]  A. Zyablovsky,et al.  Light propagation in composite materials with gain layers , 2012 .