Abstract
In photonic bandgap (PBG) fibers, light is confined by a photonic bandgap
caused by a periodic structure of air holes in the cladding regions. The doubly
degenerate fundamental mode in ideal PBG fiber structures becomes slightly
nondegenerate in actually produced fibers, and this causes polarization instability
and polarization mode dispersion. Here, to avoid these problems, we propose
a novel absolutely single-polarization PBG fiber structure with an elliptical-hole
lattice core. A PBG fiber with a single-polarization bandwidth of 420 nm is
numerically demonstrated. Furthermore, based on the proposed fiber structure,
we report another single-polarization PBG fiber that has two absolutely single-polarization
bands being orthogonal to each other.
© 2012 IEEE
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