الملخص

Abstract The aim of this work is to study the properties of the photonic crystal fibers (PCFs) and the laser field distribution at the zero dispersion wavelengths (ZDWs). Three PCFs are proposed, all the PCFs have one missing hole and one ring of holes around the core (6 holes). For PCF1, the hole diameter d=4.0µm and the pitch size Λ=2.0µm. In PCF2 a 8.1% reduction in both d and Λ. While 8.8% reduction in d & Λ for the PCF3 in order to keep the air filling fraction (AFF) (d/Λ =0.2) constant for structures which are operating in single mode regime. The real and the imaginary parts of the effective refractive index, confinement loss, dispersion profile, dispersion slope, group velocity dispersion β2 and cubic dispersion β3 all are investigated. The results show that the proposed structures gives dispersion profile with triple zero dispersion wavelength, and the reduction in d and Λ changes the positions of the triple ZDWs. The results of the laser field distribution in the PCFs show that all the structures are working in the single mode, while for the PCF3, the field are slightly extended toward the clad region at longer wavelength.