LOCALIZED FUNCTION METHOD APPLYING A SET OF SINE FUNCTIONS TO MODEL PHOTONIC CRYSTAL FIBRES

A development and an application of the localized function method based on the Galerkin method applying a set of sine functions to approximate the unknown mode fields of the localized modes propagating along the photonic crystal fibres (PCFs) is proposed. A way for considerably reducing the number of integrals in the case of symmetrical shapes of holes with respect to the axes of coordinate systems located at the centres of the holes (circular, elliptical, etc.) is also presented. The method does not require an expansion of the refractive index and thus inaccuracies of the expansion can be avoided. In the case of a circular form of the holes all integrals are solved analytically.