Infrared supercontinuum generation via large-core octagonal Ga ₈ Sb32S60-photonic crystal fibers with ultra-flattened dispersion

We investigate broadband supercontinuum in the infrared region using octagonal Ga 8 Sb[Formula: see text]S[Formula: see text] photonic crystal fibers by proposing two fiber designs with ultra-flattened all-normal and anomalous dispersion profiles with [Formula: see text][Formula: see text]ps/[Formula: see text] and [Formula: see text][Formula: see text]ps/[Formula: see text] in the wavelength regions of 3.908–8[Formula: see text][Formula: see text]m and 4.077–8.495[Formula: see text][Formula: see text]m, respectively. The first fiber with all-normal dispersion produces supercontinuum bandwidths of 7.532[Formula: see text][Formula: see text]m and 10.314[Formula: see text][Formula: see text]m (30[Formula: see text]dB level) at pump wavelengths of 4.5[Formula: see text][Formula: see text]m and 5.0[Formula: see text][Formula: see text]m, respectively, with a low peak power of 10[Formula: see text]kW due to the combination of the self-phase modulation and stimulated Raman scattering. With three zero dispersion wavelengths, the second fiber enables a supercontinuum bandwidth of 11.536[Formula: see text][Formula: see text]m (30 dB level) at the pump wavelength of 5.0[Formula: see text][Formula: see text]m with a peak power of 8[Formula: see text]kW under the influence of soliton dynamic suppression. These results, as a platform for developing broadband supercontinuum sources, are required for applications in the infrared region.