title: Characterization and modeling of microstructured chalcogenide fibers for efficient mid-infrared wavelength conversion.
abstract: We experimentally demonstrate wavelength conversion in the 2 µm region by four-wave mixing in an AsSe and a GeAsSe chalcogenide photonic crystal fibers. A maximum conversion efficiency of -25.4 dB is measured for 112 mW of coupled continuous wave pump in a 27 cm long fiber. We estimate the dispersion parameters and the nonlinear refractive indexes of the chalcogenide PCFs, establishing a good agreement with the values expected from simulations. The different fiber geometries and glass compositions are compared in terms of performance, showing that GeAsSe is a more suited candidate for nonlinear optics at 2 µm. Building from the fitted parameters we then propose a new tapered GeAsSe PCF geometry to tailor the waveguide dispersion and lower the zero dispersion wavelength (ZDW) closer to the 2 µm pump wavelength. Numerical simulations shows that the new design allows both an increased conversion efficiency and bandwidth, and the generation of idler waves further in the mid-IR regions, by tuning the pump wavelength in the vicinity of the fiber ZDW.
authors.forename: Sida
authors.initials: S
authors.lastname: Xing
authors.forename: Davide
authors.initials: D
authors.lastname: Grassani
authors.forename: Svyatoslav
authors.initials: S
authors.lastname: Kharitonov
authors.forename: Adrien
authors.initials: A
authors.lastname: Billat
authors.forename: Camille-Sophie
authors.initials: CS
authors.lastname: Brès