Numerical modeling and optimization of cladding-pumped tapered fiber Raman amplifiers

We have theoretically investigated the amplification process in the cladding-pumped tapered Raman fiber amplifiers (RFAs) for the first time. The numerical results show the high order Stokes threshold and output power can be both significantly improved in the tapered Raman fiber (TRF) in comparison with conventional double-clad Raman fiber. The threshold of 2nd Stokes and the RFA output power could reach 3000 W and 2570 W when the fiber parameters are chosen according to the simulation results and manufacturing feasibility.