Design and analysis of a hexagonal tellurite photonic crystal fiber with broadband ultra-flattened dispersion in mid-IR

摘要

We propose a modified hexagonal tellurite photonic crystal fiber (PCF) with broadband ultra-flattened dispersion near 2 mu m regime. By optimizing various structural parameters, the dispersion of the proposed PCF can be kept within 60.47 ps nm(-1) km-1 to 61.33 ps nm(-1) km(-1) from 2.15 mu m to 2.85 mu m wavelength. More importantly, the corresponding nonlinear coefficients can be as high as 378.1W(-)(1)km(-1). Leveraging on these advantages, this fiber is suitable for supercontinuum generation toward mid-infrared (MIR) wavelength range. By injecting the hyperbolic secant pulse with peak power of 5 kW and full width at half maximum (FWHM) of 176 fs into the fiber, supercontinuum spectrum covering 2000-4900 nm together with the dispersive wave locating near 933 nm can be produced. (C) 2018 Elsevier GmbH. All rights reserved.