Abstract
In this paper, the structural dependence of factor
which mainly affects a bending loss property is
theoretically investigated in all-solid photonic bandgap
fibers (PBGFs). A design principle for realizing low
bending losses is successfully figured out for the
first-order photonic bandgap (PBG). In particular, one
of the origins which causes the variation of bending
loss property for each structural parameter is
identified. In addition, we show that exploitation of a
large pitch relative to a rod diameter, aiming to
realize a large-mode area (LMA) structure, leads to a
significant degradation of the bending loss property.
Moreover, it is demonstrated that a V-value which is
proposed for all-solid PBGFs is also reduced
significantly for the LMA condition. The origin of the
degradation is attributed to the newly-excited Bloch
state which determines the second-order PBG edge.
© 2011 IEEE
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