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Opt Lett. 2008 Feb 15;33(4):306-8.

All-fiber LP11 mode convertors.

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  • 1Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom.


We describe two all-fiber devices for converting light from the fundamental mode to the second-order set of modes in optical fibers. The first is made by controlled hole collapse in a photonic crystal fiber, and the second is a twisted fused coupler made from few-moded conventional fiber. As well as having applications within fiber optics, the devices can be used to generate azimuthally polarized free-space beams.

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