Article

Free-space optical transmission with orbital angular momentum division multiplexing

Electronics Letters (impact factor: 0.96). 09/2011; DOI:10.1049/el.2011.1766 pp.972 - 973
Source: IEEE Xplore

ABSTRACT The experimental demonstration of a free-space optical transmission system with orbital angular momentum (OAM) division multiplexing is reported. Two beams have been multiplexed with different values of the azimuthal index l , and hence carrying different OAM, at a wavelength of 1550 nm. The first beam ( l = 0) is nearly Gaussian and it features an OAM equal to zero. The second beam ( l = 1) is an optical vortex produced by means of a suitable computer-generated hologram, which shows an intensity pattern with a doughnut shape and possesses an OAM of - h per photon. A binary intensity modulation at 1.25 Gbit/s has been applied to each OAM channel and an interferometer with Dove prisms has been exploited for OAM demultiplexing.

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Keywords

azimuthal index l
 
beams
 
different OAM
 
different values
 
doughnut shape
 
experimental demonstration
 
first beam
 
free-space optical transmission system
 
intensity pattern
 
OAM
 
OAM channel
 
OAM demultiplexing
 
OAM equal
 
photon
 
second beam
 
suitable computer-generated hologram
 
wavelength
 

P. Martelli