Fabrication of praseodymium‐doped arsenic sulfide chalcogenide fiber for 1.3‐μm fiber amplifiers

Pr3+‐doped As‐S chalcogenide fiber is fabricated using a double‐crucible method. The thermal and spectroscopic properties of Pr3+‐doped As‐S glasses are clarified. Pr3+‐doped As‐S fiber is shown to be a promising candidate that will lead to efficient Pr3+‐doped fiber amplifiers.