Numerical investigation on broadband mid-infrared supercontinuum generation in chalcogenide suspended-core fibers

Abstract

As 2 S 3 and As 2 Se 3 chalcogenide 3-bridges suspended-core fibers (SCFs) are designed with shifted zero-dispersion wavelengths (ZDWs) at around 1.5 µm, 2 µm, and 2.8 µm, respectively. A generalized nonlinear Schrödinger equation is used to numerically compare supercontinuum (SC) generation in these SCFs pumped at an anomalous dispersion region nearby their ZDWs. Evolutions of the long-wavelength edge (LWE), the power proportion in the long-wavelength region (PPL), and spectral flatness (SF) are calculated and analyzed. Meanwhile, the optimal pump parameters and fiber length are given with LWE, PPL, and SF taken into account. For As 2 S 3 SCFs, SC from a 14 mm-long fiber with a ZDW of 2825 nm pumped at 2870 nm can achieve the longest LWE of ∼ 13 µm and PPL up to ∼72%. For As 2 Se 3 SCFs, the LWE of 15.5 µm and the highest PPL of ∼ 87% can be achieved in a 10 mm-long fiber with ZDW of 1982 nm pumped at 2000 nm. Although the As 2 Se 3 SCFs can achieve much longer LWE than the As 2 S 3 SCFs, the core diameter of As 2 Se 3 SCFs will be much smaller to obtain a similar ZDW, leading to lower damage threshold and output power. Finally, the optimal parameters for generating SC spanning over different mid-IR windows are given.

Design and analysis of suspended core channel waveguide made using As2Se3 glass system for mid-infrared supercontinuum generation

“…The wavelengthdependent material propagation loss is considered as loss edge given in Fig. 5(a) [45] at the input of each SCW during the numerical simulation. for obtaining the highest spectral flatness from the several waveguide geometries analyzed.…”

Analysis and design of dispersion-engineered cascaded channel waveguide for mid-infrared supercontinuum generation employing pump source at telecommunication wavelength

“…1(c). The propagation loss edge [44] considered for the As 2 Se 3 glass system is also illustrated in Fig. 1(c) and the absorption loss for this glass system is reported 0.65 dB/cm at 10.6 µm by Shiryaev et al [37].…”