Abstract

High birefringence induced by elliptical air hole photonic crystal fibers (EHPCFs) is analyzed numerically using the finite-element method. Statistical correlations between the birefringence and the various parameters are obtained. We found that the complex elliptical air hole is better than that of a circular one to obtain high birefringence in photonic crystal fibers. Our suggested structures can considerably enhance the birefringence in EHPCFs and show that the birefringence can be as high as $1.1294\times {10}^{-2}$, which is higher than the birefringence obtained from conventional step-index fiber (5 × 10⁻⁴), circular air holes PCF $\left(3.7\times {10}^{-3}\right)$, and elliptical hollow PCF (2.35 × 10⁻³).

© 2007 Optical Society of America

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