A Glue Splicing Method to Join Silica and Fluoride Fibers With Low Attenuation

We improved our glue splicing method to join silica and fluoride glass fibers. It is now even more robust and stabile with a mean loss below 0.5 dB. Moreover, the splice reflection was reduced to about -42 dB when an index matching gel was used. Pieces of Pr
³⁺
/Yb
³⁺
doped ZBLAN fibers with lengths of 25 cm were connected to silica fibers. In a fiber laser resonator 6 mW of red laser radiation was achieved with the spliced fibers at a pump power level of 144 mW at 845 nm.