Abstract
Abstract The proposed work presents a nested Photonic Crystal Fiber(PCF) with
a hexagonal lattice of air holes, capable of supporting Orbital Angular Momentum
modes(OAM) and generating a wide-ranging supercontinuum spectrum, further
enhancing its utility in various optical applications. The Photonic Crystal Fiber
consists of a dense flint SF6 and a very light flint LLF1, fabricated from Schott. Finite
Element Method is used for the analysis of Nested Photonic Crystal Fiber characteris-
tics using COMSOL Multiphysics. A total of 120 Orbital Angular Momentum modes
modes have been obtained in the fiber, with 86 in the outer core and 34 in the inner
core. The generalised Nonlinear Schrodinger Equation provides a numerical description
of the pulse that is propagating through the PCF. In this article, the proposed nested
PCF can be used to generate supercontinuum by pumping with a hyperbolic secant
pulse, with red an average power of 71 mW. The resulting supercontinuum spans an
impressive bandwidth, extending from approximately 1122 to 2072 nm.
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