Valentin Constance, Calvet Pierre, Quiquempois Yves, Bouwmans Géraud, Bigot Laurent, Coulombier Quentin, Douay Marc, Delplace Karen, Mussot Arnaud, Hugonnot Emmanuel
Opt Express. 2013 Oct 7;21(20):23250-60. doi: 10.1364/OE.21.023250.
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.
