Abstract
A numerical model of an Erbium-Ytterbium distributed feedback fibre laser was developed. The optimized Er3+-Yb3+ distributed feedback fibre laser is 50 mm long with a phase shift situated at 20.5 mm. The output power is 22.5 mW when the pump power is 100 mW with a slope efficiency of 35% and a threshold pump power of 10 mW. Simulations were performed to quantify the detrimental effects of cooperative up-conversion and excited state absorption on the characteristics of the laser. These phenomena reduce the output power of the laser with a rate of almost 6% at 100 mW pump power and increase the threshold from around 1mW to almost 10 mW. The results are in good agreement with experimental published work.