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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