Stimulated Brillouin scattering suppression in fiber amplifiers with multi-point pump

A new scheme for Stimulated Brillouin Scattering (SBS) suppression is proposed based on multi-point pump technique. The pump power is coupled into the double-clad fiber by several pump points instead of one fiber combiner, which will rearrange the pump power distribution along the active fiber and influence the amplifier process of SBS light. The numerical simulation indicates that SBS is effectively suppressed in a fiber amplifier with an output up to 700W and a 1kHz line-width by virtue of the configuration. Besides, the SBS threshold demonstrates a 3.7 times increase compared with an strain allied scheme.