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  • Title: Multiple mode conversion and beam shaping with superimposed long period gratings.
    Author: Sumetsky M, Ramachandran S.
    Journal: Opt Express; 2008 Jan 07; 16(1):402-12. PubMed ID: 18521172.
    Abstract:
    We demonstrate how to convert several arbitrary optical fiber modes into a single mode and vice versa using superimposed long period gratings (SLPG). As an example, we theoretically consider SLPG consisting of five gratings, which couple first six LP(0j) modes of a single mode fiber. We optimize the SLPG output to form light beams that are focused at a distance 0.5 mm and 1 mm from the fiber. In addition, we optimize the SLPG output to generate a beam with an amplitude that is uniform inside a 4(0) angle with a +/-0.2 % accuracy. In the latter case, the refractive index profile of the SLPG is calculated for an SMF-28 fiber. The proposed SLPG devices can be used as efficient all-fiber mode focusers and beam shapers.
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