Role of Bend on the Optimization of 980-nm-Pumped Erbium-Doped Fiber Amplifier

We describe the design optimization performed numerically for a 980-nm-pumped erbium-doped fiber amplifier in the presence of bending, for both fully and fractionally doped cores. All calculations are carried out using three-level laser rate equations of laser theory and by taking effects of fiber bend through bend-induced loss as well as deformation of mode fields at both pump and signal wavelengths.