The first integrated optical amplifying acoustically tunable wavelengt
h filter in Er-doped LiNbO3 is reported. At the signal wavelength of l
ambda(s) = 1531 nm a maximum gain of 4.8 dB has been obtained with a c
oupled pump power of 160 mW (lambda(p) = 1484 nm). Lossless signal tra
nsmittance has been achieved with a pump power as low as 13.5 mW for l
ambda(s) >1561 nm.