Abstract
We numerically investigate the impact of transversal defects on the minimum confinement loss value in the case
of a solid-core photonic-bandgap fiber with parabolic germanium-doped inclusions. We show that a standard deviation
of only 5% of either the diameter, the refractive-index contrast, or the position of the high-index inclusions could
double the minimal value—as a function of frequency—of losses. Moreover, we demonstrate that, in our
case, accurately controlling the position of the doped inclusions along the first ring around the core is more
important than having an accurate control on their diameter and index contrast. Oddly enough, we also point out that
the defects could lead to a decrease of the minimum loss value. Furthermore, we demonstrate that a structure made of
inclusions of two different refractive indices could have lower loss than both structures made of only one of these
two types of inclusion.
© 2007 IEEE
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