Optimizing optical properties by core geometry variation of chalcogenide tellurite based photonic crystal fiber

Abstract

We propose an approach based on core geometry variation in designing photonic crystal fiber (PCF) to optimize different optical properties. To investigate those properties of the nobly designed geometrically varied core PCF, Finite element method (FEM) is adopted. The nonlinearity, scattering loss, confinement loss, dispersion profile, numerical aperture, dissemination of power in different portions and effective modal area of the designed waveguide are thoroughly analyzed. The proposed structure with circular core numerically shows unprecedented confinement loss of the order of 10−10 (2.22 × 10−10 dB/m to be precise) with nonlinearity of 51000 W−1km−1 and scattering loss of 1. 2 × 10−12 dB/km. Zero dispersion is also obtained at 1500 nm. The fiber is then used for supercontinuum generation and obtained bandwidth of about 3500 nm at – 40 dB along 2 mm of fiber length. It is anticipated that the proposed PCF could be useful in spectroscopy and biomedical imaging as well.