We propose a new approach to developing of graded-index chalcogenide fibers. Since chalcogenide glasses are incompatible with current vapor deposition techniques, the arbitrary refractive index gradient is obtained by means of core nanostructurization by the effective medium approach. We study the influence of graded-index core profile and the core diameter on the fiber dispersion characteristics. Flat, normal dispersion profiles across the mid-infrared transmission window of the assumed glasses are easily obtained for the investigated core nanostructure layouts. Nonlinear propagation simulations enable to expect 3.5-8.5 µm spectrum of coherent, pulse preserving supercontinuum. Fabrication feasibility of the proposed fiber is also discussed.
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Supercontinuum generation with extended bandwidth and improved purity in graded-index ring-core fiber.
Sci Rep
December 2024
School of Information and Communications Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
Article Synopsis
- This study examines how the shape factor (k) influences the mode properties of graded-index ring-core fibers (GIRCF), specifically focusing on a design with 50 mol% Ge-doping and a shape factor of 2.
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- The introduction of a graded refractive index profile (RIP) enhances ring-core fiber design by promoting flat dispersion, minimizing spin-orbit coupling, and enabling better mode purity and broader spectral coverage.
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