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Opt Express. 2010 Dec 20;18(26):27197-204. doi: 10.1364/OE.18.027197.

Single-mode analysis of Yb-doped double-cladding distributed spectral filtering photonic crystal fibers.

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  • 1Information Engineering Department, University of Parma, Parma, Italy.


Hybrid large mode area Ytterbium-doped double-cladding photonic crystal fibers with anti-symmetric high refractive index inclusions provide efficient amplified spontaneous emission spectral filtering. Their performances have been analyzed by numerical simulations and experimental measurements. In particular, the fiber single-mode behaviour has been studied, by taking into account the fundamental and the first higher-order mode. Two approaches, the core down-doping and the reduction of the air-hole diameter in the inner cladding, have been successfully applied to reduce the higher-order mode content, regardless of the bending of the doped fiber, without significantly affecting its spectral filtering properties.

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