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Photodarkening can be created under pumping at the Yb absorption band or visible wavelength [1-3], and hence can be a critical hurdle to overcome in the Yb-doped fibre (YDF) based devices. It is generally recognised that the photodarkening induces excess background loss at the Yb-band, and this leads to degradation of the device performance. Here we report the influence of the photodarkening at a pump wavelength to envisage the direct impact of the photodarkening in the YDF based devices. Our results suggest that the photodarkening does not only induce excess background loss as commonly interpreted, but also influences pump efficiency.
© 2013 IEEE
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