Perturbations to the ideal cross section of photonic crystal fibers (PCFs) are introduced in order to investigate their performances as a function of the structural fluctuations which may occur during fabrication. The effects of the cross-section geometry perturbations on the dispersion characteristics like dispersion parameter and differential group delay are presented and discussed. The analysis has been performed through the finite element method which assures high flexibility and high solution accuracy.
Annamaria Cucinotta, Stefano Selleri, Luca Vincetti, and Maurizio Zoboli, "Perturbation Analysis of Dispersion Properties in Photonic Crystal Fibers Through the Finite Element Method," J. Lightwave Technol. 20, 1433- (2002)