Abstract
We present a systematic and comprehensive analysis of photonic crystal
fibers with a general Bravais lattice and one hole per unit cell. We show
how the lack of a proper separation of lattice shape effects from volume
rescaling can lead to an incorrect assessment of the impact of lattice
shape. We study and compare the endlessly single-mode, waveguide dispersion,
and birefringence properties of the fundamental mode across all lattice
shapes. For example, we show that the triangular and square lattice shapes
offer the largest critical air-hole radius for the endlessly single-mode
operation. We identify a general class of PCFs with large birefringence and
show that the total birefringence of the fundamental mode is the result of
the competition between two opposing effects: the cladding lattice shape and
the asymmetry of the core and can vanish for some PCFs with even very
nonsymmetric lattices. We show designs for which the birefringence vanishes
even with nonsymmetric lattices and cores.
© 2009 IEEE
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