We demonstrate the possibility of broadening the emissions spectra of super
fluorescent fiber lasers by combinations of different kinds of single-mode
doped silica fibers. We obtained an optical bandwidth of more than 70 nm (F
WHM) between 1030 and 1100 nm using Nd:Cs, Nd:Ge, and Yb-doped fibers. The
total output power measured from the single-mode fibers was more than 100 m
u W in a single-pass configuration.