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In light of recent progress in the fabrication of gallium lanthanum sulfide (GaLaS) fibers, we have modeled the performance of dysprosium-doped GaLaS fiber amplifiers operating at 1.3 microm . Based on experimental data, we find that the incorporation of a codopant (terbium) in the fiber core significantly shortens the optimum amplifier length from &gt;30 m to approximately 3 m . Such a device may be practical, given the fiber losses currently achieved in GaLaS fibers.

Properties of dysprosium-doped gallium lanthanum sulfide fiber amplifiers operating at 13 µm