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OPTICS EXPRESS
Volume 19, Issue 15, Pages 14473-14478Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.014473
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We investigated photodarkening (PD) parameters of Yb/Aldoped silica fibers as a function of the concentration of additional rare earth ions like Tm or Er. It was found that both Tm and Er cause a decrease in Yb inversion followed by a reduction of PD in the case of Er, whereas Tm-codoping with more than 10 mol-ppm can strongly accelerate the process and also increase the PD loss. However, contrary to [1], we conclude that the typical PD behavior of Yb/Al fibers is an intrinsic feature of this fiber type and not caused by trace impurities of Tm (< 1 mol-ppm) unintentionally incorporated by the raw materials during fiber preparation. (C) 2011 Optical Society of America
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