  This study explores the efficacy of thermal splicing conditions between
silica and zirconium-fluoride fibers, focusing on achieving mechanical strength
between the two fibers. A comprehensive characterization of the thermal profile
in the hot zone of the filament splicer was conducted using a fiber Bragg
grating, providing valuable insights into its stability and overall
performance. Results demonstrate mechanically strong joints and suggest a very
narrow temperature window to achieve strong connection between the two
materials. Moreover, we characterize the surface composition of the ZrF4 fiber
using energy dispersive spectroscopy following splicing at ideal temperatures,
as well as at higher and lower temperatures. This work paves the way towards
future implementation of silica and fluoride fibers splicing using alternative
splicing solutions such as CO2 laser system while raising interesting facts for
further studies in the specific field.
