Journal
OPTICS EXPRESS
Volume 23, Issue 3, Pages 3721-3730Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.003721
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Funding
- DARPA InPho program under ARO [W911NF-12-1-0323, W911NF-13-1-0103]
- Air Force [FA8721-05-C-0002]
- NSF [ECCS-1310493]
- NSF Graduate Research Fellowship [DGE-1247312]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1310493] Funding Source: National Science Foundation
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The promise of the infinite-dimensionality of orbital angular momentum (OAM) and its application to free-space and fiber communications has attracted immense attention in recent years. In order to facilitate OAM-guidance, novel fibers have been proposed and developed, including a class of so-called ring-fibers. In these fibers, the wave-guiding region is a high-index annulus instead of a conventional circular core, which for reasons related to polarization-dependent differential phase shifts for light at waveguide boundaries, leads to enhanced stability for OAM modes. We review the theory and implementation of this nascent class of waveguides, and discuss the opportunities and limitations they present for OAM scalability. (C)2015 Optical Society of America
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