We have proposed a novel type of photonic crystal fiber (PCF) with low dispersion and high nonlinearity for four-wave mixing. This type of fiber is composed of a solid silica core and a cladding with a squeezed hexagonal lattice elliptical airhole along the fiber length. Its dispersion and nonlinearity coefficient are investigated simultaneously by using the full vectorial finite element method. Numerical results show that the proposed highly nonlinear low-dispersion fiber has a total dispersion as low as $\pm 2.5\mathrm{ps}{\mathrm{nm}}^{-1}{\mathrm{km}}^{-1}$ over an ultrabroad wavelength range from 1.43 to $1.8\mathrm{\mu m}$ , and the corresponding nonlinearity coefficient and birefringence are about $150{\mathrm{W}}^{-1}{\mathrm{km}}^{-1}$ and $2.5\times {10}^{-3}$ at $1.55\mathrm{\mu m}$ , respectively. The proposed PCF with low ultraflattened dispersion, high nonlinearity, and high birefringence can have important application in four-wave mixing.

© 2010 Optical Society of America

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