Journal
OPTICS EXPRESS
Volume 19, Issue 2, Pages 482-492Publisher
Optica Publishing Group
DOI: 10.1364/OE.19.000482
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Funding
- Ministry of Science and Technology of China [2009DFA52300, 2010CB327702]
- National Research Foundation of Singapore [NRF-G-CRP 2007-01]
- National Natural Science Foundation of China [10974101]
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We report an approach to the increase of signal channels in free-space optical communication based on composed optical vortices (OVs). In the encoding process, conventional algorithm employed for the generation of collinearly superimposed OVs is combined with a genetic algorithm to achieve high-volume OV multiplexing. At the receiver end, a novel Dammann vortex grating is used to analyze the multihelix beams with a large number of OVs. We experimentally demonstrate a digitized system which is capable of transmitting and receiving 16 OV channels simultaneously. This system is expected to be compatible with a high-speed OV multiplexing technique, with potentials to extremely high-volume information density in OV communication. (C) 2011 Optical Society of America
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