We report on a diode-pumped Er:Yb laser able to generate a single-frequency
output power in excess of 200 mW at both 1.53 mum and 1.56 mum and over 30
0 mW in multimode operation. The tuning characteristics of the source are r
eported and discussed, The relative intensity noise presents in all configu
rations a peak value lower than -92 dB/Hz and its level decreases below - 1
60 dB/Hz for frequencies higher than 8 MHz.