Abstract
We investigate a silica-based thulium-doped fibreamplifier, which is a promising candidate for an amplifying device in the S band,in detail using a single wavelength upconversion pumping scheme centred at 1064 nm.Our experimental results show that in terms of gain and noise figure, thebi-directional pumping scheme is the best one in the three pumping schemes, namedforward, backward and bi-directional pumping schemes. The amplifier has a gain notonly in the S band, but also in the C band, even in the L band. The gain isabove 3 dB from 1525 nm to 1580 nm with a peak of 7.5 dB.
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