Abstract
In this paper, we investigate the ultimate low loss property for several
realistic core shapes in triangular-type air-guiding photonic bandgap fibers
(PBGFs) through a full-vector modal solver based on the finite element method.
We show that the surface mode free condition is expressed as a normalized
silica-ring thickness $T = 0.5$ for
any core size and the cladding structural parameters, regardless the core
radius of the silica-ring is one of the main factors of dominating the surface
mode's condition, and the wavelength range of the PBG changes on varying the
structural parameters of the cladding. Moreover, we propose a novel type of
PBGF without surface mode, which exhibits lower scattering losses caused by
surface roughness of the silica-ring in comparison to 19 cell-core PBGFs and
suppresses the mode coupling between fundamental-like and higher order modes
when compared to 37 cell-core PBGFs.
© 2008 IEEE
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