Abstract
From scanning-electron microscope images of the cross section of a photonic-bandgap
fiber (NKT Photonics' HC-1550-02) we developed a realistic model for its permittivity
profile that includes all observable structural deformations in the core and
in the first two rows of cladding holes. Using this more accurate index profile
in our C++ full-vectorial finite-difference mode solver, we numerically studied
this fiber's modal dispersion, along with the intensity profile, group index
spectrum, and group-velocity dispersion spectrum of its fundamental mode.
Comparisons between these predictions and their experimental counterparts
measured in the fiber show good quantitative agreement for all these characteristics.
On the other hand, when these structural deformations are purposely not included
in the permittivity profile, the predicted and measured characteristics generally
poorly match. The study demonstrates that first, accurate siμltaneous predictions
of several key modal characteristics of hollow-core fibers can be obtained
numerically, and that although small, the aforementioned index-profile perturbations
μst be included in order to obtain sufficient accuracy.
© 2013 IEEE
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