Abstract
The cross section of a real air-core photonic bandgap fiber (PBGF) with structural distortions is analyzed
using a vectorial finite-element method and compared with an ideal structure. It is found that the properties of
air-core PBGFs are extremely sensitive to changes of the structural parameters. Structural distortions in real
fibers have significant impact on fiber properties such as bandwidth and tunneling loss. Numerical results show that
the bandwidth of the real fiber is reduced by a factor of two, and the tunneling is increased by almost a factor of
10<sup>4</sup> when compared to an ideal cross section.
© 2007 IEEE
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