Design and Analysis of Elliptical Core Spiral Silica Photonic Crystal Fiber with Improved Optical Characteristics

Abstract

The aim of this paper is to attempt an optimized design from spiral horizontal and vertical core slotted silica photonic crystal fiber through which we can get low dispersion profile, low confinement loss and better transmission curve in both the slotted spiral silica PCF structures. For this purpose we have used opti Finite difference time domain (FDTD) (Liao et al. in EEE Photon Technol Lett. https://doi.org/10.1109/LPT.2015.2443986, [9], Bottacini et al. in J Lightwave Technol 22(7), 10]) with transparent boundary conditions (TBC) (Sinha et al. in IEEE J Sel Top Quantum Electron 22(2), [7], Zhang et al. in Opt Lett 35:3829–3831, [8], Liao et al. in IEEE Photon Technol Lett. https://doi.org/10.1109/LPT.2015.2443986, [9], Bottacini et al. in J Lightwave Technol 22(7), [10], Toulouse in J Lightwave Technol 23(11), [11]). In this design initially the core region is selected in horizontal elliptical shape, while the cladding part is maintained in circular shape. Later on the elliptically core is converted into vertical direction keeping the cladding region in circular shape. The core diameter is maintained at 0.25 and 0.5 μm with minor and major axes, while the cladding diameter varied from 0.5 to 1.25 μm. The design so obtained faced many conflictions but after setting the parameters in proper manner, it is ready for getting the optimized results and it also maintained the refractive index (Birks et al. in Opt Lett 22(13):961–963, [1], Liao et al. in IEEE Photon Technol Lett 26(4), [2], Rabiul Hasan et al. in IEEE Photon Technol Lett. https://doi.org/10.1109/LPT.2016.2572141, [3]) of the silica at 1.457.