Abstract
In this study we propose a new photonic crystal fiber (PCF) design that
simultaneously offers broadband single-mode operation, high birefringence, and large
normal dispersion in the optical-communication wavelength regime. The waveguide is
based on a hybrid square-lattice PCF (HS-PCF) that has circular air holes of two
different diameters alternating in the cladding, plus a pure silica defect at the
center. The optical properties of the guided modes are analyzed numerically by the
finite-element method (FEM) with a perfectly matched layer as the boundary
condition. The optimized HS-PCF has a dispersion coefficient of
<TEX>$-601.67\;ps\;nm^{-1}\;km^{-1}$</TEX> and a high birefringence of
<TEX>$1.025{\times}10^{-2}$</TEX> at
<TEX>$1.55{\mu}m$</TEX>. In addition, over the S+C+L+U wavelength bands
the proposed HS-PCF with ultraflat birefringence with a slope on the order of
<TEX>$10^{-5}$</TEX>.
© 2015 Optical Society of Korea
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