Top-hat beam output of a single-mode microstructured optical fiber: impact of core index depression

A new strategy to obtain a single-mode fiber with a flattened intensity profile distribution is presented. It is based on the use of an OVD-made high index ring deposited on a silica rod having a refractive index slightly lower than the silica used for the microstructured cladding. Using this strate...

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Bibliographic Details
Published in:Optics express 2013-10, Vol.21 (20), p.23250-23260
Main Authors: Valentin, Constance, Calvet, Pierre, Quiquempois, Yves, Bouwmans, Géraud, Bigot, Laurent, Coulombier, Quentin, Douay, Marc, Delplace, Karen, Mussot, Arnaud, Hugonnot, Emmanuel
Format: Article
Language:English
Subjects:
Optics
Physics
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Summary:A new strategy to obtain a single-mode fiber with a flattened intensity profile distribution is presented. It is based on the use of an OVD-made high index ring deposited on a silica rod having a refractive index slightly lower than the silica used for the microstructured cladding. Using this strategy, we realized the first single-mode fiber with a quasi-perfect top-hat intensity profile around 1 µm. Numerical studies clearly demonstrate the advantage of using a core index depression to insure the single-mode operation of the fiber at the working wavelength.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.21.023250