Tunable fiber laser comb based on four wave mixing phenomenon in Brillouin erbium fiber laser cavity

A tunable fiber laser comb is experimentally demonstrated in linear Brillouin erbium fiber laser (BEFL) cavity with an assistant of four wave mixing (FWM) process. Two nonlinear processes are contributed, stimulated Brillouin scattering (SBS) and FWM in this study, to improve the efficiency of the laser cavity. The number of the generated Stokes and anti-Stokes signals is improved to be 120 Single space channels. The recorded Stokes lines cover 9 nm in L-band region of 1,580 nm. Furthermore, the tuning range of the proposed cavity is also improved to 50 nm that covers C- and L-band regions from 1,550 to 1,600 nm. Three parameters are associated to achieve such wide tuning range in the proposed setup: high Brillouin pump (Bp) of 8 dBm, pre-amplification technique for inserting Bp signal, and using wide erbium emission peak in FWM section.