title: Full-vectorial analysis of complex refractive index photonic crystal fibers.
abstract: We investigated the modal properties of complex refractive-index core photonic crystal fibers (PCFs) with the supercell model. The validity of the approach is shown when we compare our results with those reported earlier on a step complex refractive-index profile. The imaginary part of the electric field results in wave-front distortion in the complex refractive-index profile PCFs, which means that the power flows out or into the doped region according to the sign of the imaginary part of the refractive index. A simple formula is proposed for calculating the gain or loss coefficients of these fibers. The numerical results obtained by the approximation formula agree well with the full-vectorial results.
authors.forename: Ren
authors.initials: R
authors.lastname: Guobin
authors.forename: Wang
authors.initials: W
authors.lastname: Zhi
authors.forename: Lou
authors.initials: L
authors.lastname: Shuqin
authors.forename: Liu
authors.initials: L
authors.lastname: Yan
authors.forename: Jian
authors.initials: J
authors.lastname: Shuisheng