We investigate how the strongly wavelength-dependent birefringence in nonlinear photonic crystal fibers leads to a splitting in the zero-dispersion wavelength for the two polarizations. We translate the requirements for the maximum splitting of the zero-dispersion wavelength to requirements for transverse structural uniformity by adopting a simple effective-index approach in which the birefringence is calculated in a step-index fiber with an elliptical core. We find that to reduce the splitting to less than 1 nm the birefringence should be less than 2 ×10 <sup>-5</sup>, resulting in a transverse uniformity requirement of 1–3%, depending on the index step from the core to the cladding.
© 2004 Optical Society of America
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2310) Fiber optics and optical communications : Fiber optics
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
K. P. Hansen, A. Petersson, J. R. Folkenberg, M. Albertsen, and A. Bjarklev, "Birefringence-induced splitting of the zero-dispersion wavelength in nonlinear photonic crystal fibers," Opt. Lett. 29, 14-16 (2004)