Journal article
Single-Mode Design Guidelines for 19-Cell Double-Cladding Photonic Crystal Fibers
Inf. Eng. Dept., Univ. of Parma, Parma, Italy1
NKT Photonics A/S, Birkerod, Denmark2
EOLITE Syst., Pessac, France3
Yb-doped double-cladding photonic crystal fibers have become key components for power scaling in fiber laser systems, by providing many advantages, especially an ultra large effective area. The single-mode regime, which is a mandatory requirement for high quality laser beams, can be obtained in such large core active fibers only through a careful design.
In this paper the cut-off properties of 19-cell photonic crystal fibers have been thoroughly investigated with the avoided-crossing approach, in order to find guidelines for the design of single-mode fibers. The air-hole diameter and the core refractive index have been changed, as well as the number of air-hole rings in the fiber inner cladding.
Simulation results have shown that, regardless of the air-hole ring number, the guided-mode cut-off properties are strongly influenced by the main design parameters, especially by the core refractive index. In particular, a wider single-mode wavelength range can be obtained in 19-cell fibers with small air-holes and low core refractive index.
Moreover, double-cladding photonic crystal fibers with larger inner-cladding provide better guided-mode cut-off properties, which can have positive effects on the amplification process in practical applications.
Language: | English |
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Publisher: | IEEE |
Year: | 2012 |
Pages: | 1909-1914 |
ISSN: | 15582213 and 07338724 |
Types: | Journal article |
DOI: | 10.1109/JLT.2012.2191137 |
19-cell double-cladding photonic crystal fibers Absorption Couplings Finite element method Frequency modulation High-power fiber lasers Magnetic cores Photonic crystals Refractive index Silicon compounds Yb-doped double-cladding photonic crystal fibers air-hole diameter avoided-crossing approach core refractive index fiber inner cladding fiber laser systems fibre lasers guided-mode cut-off properties holey fibres laser beams photonic crystals refractive index single-mode design guidelines single-mode regime ytterbium