Numerical Analysis of Gain and Amplified Spontaneous Emission Characteristics in an Erbium Doped Fibre under 830 nm Pump

This work analyses gain property of an erbium doped fibre (EDF) pumped at 830 nm. Particularly, gain at 1550 nm obtained from an EDF is numerically investigated by solving a number of rate and propagation equations incorporating the effect of amplified spontaneous emission (ASE). In addition, the impact of forward and backward ASE on the propagation of pump and signal powers along the fibre length is studied. ASEs are observed to increase if pump power or signal power or EDF length is increased. However, the impact of ASE on gain is very much sensitive with fibre length and power levels. For instance, gain at 1550 nm is found to be more affected by ASE at lower pump and signal powers. It is observed that, gain difference (AG) between gain estimated with ASE effect and without ASE effect is higher for pump powers lower than 50 mW at 830 nm. Thus, the analysis of gain properties in EDF under 830 nm pump are significant to model and design amplifiers using EDF.