Influence of fiber parameters to Er3+/Yb3+ co-doped double-cladding fiber laser

Based on rate equations, the method of changing doping concentration and cladding size was used to get the results of the characteristics of the Er³⁺/Yb³⁺ co-doped double-cladding fiber laser for the investigation of the influence of the doping concentration and cladding size to the Er³⁺/Yb³⁺ co-doped double-cladding fiber laser. The conclusion shows: when Er³⁺-concentration is stable, the output power will be increased efficiently with Yb³⁺-concentration increase; on the contrary, when Yb³⁺-concentration is stable, the output power will be increased too with Er³⁺-concentration increase, but the change is not obvious; the optimal length of fiber becomes shorter when the inner cladding size becomes smaller.