Background: Materials with features such as high transparency and nonlinearity in a wide
range of infrared wavelengths can be used in the manufacture of optical fibers. Amongst the materials
that are used in the manufacture of optical fibers, chalcogenide compounds are the key materials
in the infrared wavelength range. This paper presents a new hexagonal nanostructured photonic crystal
fiber based on chalcogenide glass.
Methods: In this paper, the parameters like chromatic dispersion, confinement loss, effective area of
the propagating mode, and the nonlinear coefficient are examined and simulated. Each concept is
explained and the relations among them are explicated. The core is made up of As2Se3 chalcogenide
glass and the cladding network consists of 6 air hole rings embedded in the As2Se3 chalcogenide
glass. The most important factors in controlling dispersion in the structure are its geometrical parameters.
Results: Simulations are carried out using FDTD method. In this structure, parameters such as dispersion,
confinement loss, effective mode area, and nonlinear coefficient are examined and the results
are presented. It can be concluded that there are four zero dispersion points at 1.03, 2.27, 9.75
and 14.77 μm. The amount of loss from 1 μm to about 10 μm is almost negligible. Considering that
within this range, there are also three zero dispersion points, hence, this makes our proposed N-PCF
ideal for supercontinuum generation.
Conclusion: By adjusting the structural parameters of the N-PCF, the confinement loss is almost
zero over the wavelength range of 1 μm to about 10 μm, 4 zero dispersion points are obtained in the
mid-infrared region and the nonlinear coefficient is calculated to be about 35 w-1m-1 at 1.55 μm. It is
also concluded that the dispersion is almost flat in the infrared wavelength range. The proposed NPCF
with the above characteristics is suitable for supercontinuum generation.