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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 36, Iss. 21 — Nov. 1, 2011
  • pp: 4269–4271

Fiber coupler for generating orbital angular momentum modes

Yan Yan, Jian Wang, Lin Zhang, Jeng-Yuan Yang, Irfan M. Fazal, Nisar Ahmed, Bishara Shamee, Alan E. Willner, Kevin Birnbaum, and Sam Dolinar  »View Author Affiliations


Optics Letters, Vol. 36, Issue 21, pp. 4269-4271 (2011)
http://dx.doi.org/10.1364/OL.36.004269


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Abstract

We propose a fiber coupler consisting of a central ring and four external cores to generate up to ten orbital angular momentum (OAM) modes. Four coherent input lights are launched into the external cores and then coupled into the central ring waveguide to generate OAM modes. By changing the size of the external cores, one can selectively excite a high-order OAM mode. The quality of the generated OAM modes can be enhanced by adjusting the polarization state and the phase of input lights. We show the generation of OAM modes with odd charge numbers of 9 to + 9 (i.e., 10 modes totally) with mode purity of > 99 % using < 2 mm long fiber. This fiber coupler design can be extended to enable all-fiber spatial-mode (de)multiplexing.

© 2011 Optical Society of America

OCIS Codes
(060.2380) Fiber optics and optical communications : Fiber optics sources and detectors
(050.4865) Diffraction and gratings : Optical vortices

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: July 7, 2011
Revised Manuscript: September 20, 2011
Manuscript Accepted: September 27, 2011
Published: October 31, 2011

Citation
Yan Yan, Jian Wang, Lin Zhang, Jeng-Yuan Yang, Irfan M. Fazal, Nisar Ahmed, Bishara Shamee, Alan E. Willner, Kevin Birnbaum, and Sam Dolinar, "Fiber coupler for generating orbital angular momentum modes," Opt. Lett. 36, 4269-4271 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-21-4269


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