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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 28, Iss. 1 — Jan. 1, 2011
  • pp: 61–65

Efficient generation and control of different-order orbital angular momentum states for communication links

Sergei Slussarenko, Ebrahim Karimi, Bruno Piccirillo, Lorenzo Marrucci, and Enrico Santamato  »View Author Affiliations


JOSA A, Vol. 28, Issue 1, pp. 61-65 (2011)
http://dx.doi.org/10.1364/JOSAA.28.000061


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Abstract

We present an optical scheme to encode and decode 2 bits of information into different orbital angular momentum (OAM) states of a paraxial optical beam. Our device generates the four light angular momentum states of order ± 2 and ± 4 by spin-to-orbital angular momentum conversion in a triangular optical loop arrangement. The switching among the four OAM states is obtained by changing the polarization state of the circulating beam by two quarter-wave plates, and the 2 bit information is transferred to the beam OAM exploiting a single q plate. The polarization of the exit beam is left free for an additional 1 bit of information. The switching among the different OAM states can be as fast as a few nanoseconds, if suitable electro-optical cells are used. This may be particularly useful in communication systems based on light OAM.

© 2010 Optical Society of America

OCIS Codes
(050.4865) Diffraction and gratings : Optical vortices
(260.6042) Physical optics : Singular optics
(230.3750) Optical devices : Optical logic devices

ToC Category:
Optical Devices

History
Original Manuscript: July 9, 2010
Revised Manuscript: November 12, 2010
Manuscript Accepted: November 19, 2010
Published: December 27, 2010

Citation
Sergei Slussarenko, Ebrahim Karimi, Bruno Piccirillo, Lorenzo Marrucci, and Enrico Santamato, "Efficient generation and control of different-order orbital angular momentum states for communication links," J. Opt. Soc. Am. A 28, 61-65 (2011)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-28-1-61


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  20. Because we are only interested to the OAM value of the beam, we have neglected the phase delay between the first and second trip inside the optical loop. Indeed, the beam with OAM value |m|=4 has a trip delay with respect to the beam with OAM value |m|=2.
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  25. This pattern has the characteristic form of a six-petal flower.

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