Broadband radiation source based on an ytterbium-doped fibre with fibre-length-distributed pumping

A broadband radiation source emitting in the 1.03 – 1.1-μm spectral region is built. The –3-dB level width of the emission spectrum of the source is 47 nm at the maximum output power of 22 mW. An Yb-doped fibre twisted with a passive fibre is used as the active medium in the source. The source is pumped through the passive fibre.