Abstract
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.
© 2012 IEEE
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