  We demonstrate gain-switched fiber laser with bias pumping plays an important
role in regulating chaotic relaxation spikes. Under certain conditions the
profile of output pulse from gain-switched fiber laser can keep the same shape
as that of pump pulse. Bias pumping technique may have significance in
increasing output stable pulse energy in gain-switched fiber laser.
Gain-switched fiber laser with bias pumping may be interesting for some
applications in micro-processing and thin film removal.
