Abstract
In this paper, we investigate the effects of complex energy transfer
dynamics and Gaussian profiles on the gain and noise figure performance of
erbium-doped fiber amplifiers (EDFAs) with high doping concentration. We use
a two-level system to study the complex energy transfer dynamics that comes
from the homogeneous up-conversion (HUC) and the pair-induced quenching
(PIQ). In our model, the system is stimulated by a pump source at the
wavelength of 1480 nm and operated with a signal source at the wavelength of
1560 nm. Assuming a uniform distribution of erbium ions in the fiber core,
we approximate the fundamental mode distributions by Gaussian profiles which
are commonly used to calculate the mode radius or spot size. Using the
numerical calculations and analysis of the rate and power propagation
equations for a two-level model under consideration, the most advantageous
Gaussian profile is determined as the Whitley mode radius to obtain a
high-gain and a low-noise figure per unit length of silica-based fiber
amplifiers. The effects of the number of ions per cluster and the percentage
of ions in clusters on the calculated gain and noise figure are compared for
several pump powers. Results are discussed to achieve a desired gain and
noise figure performance, and compared with the available experimental data
to verify the feasibility of the model.
© 2009 IEEE
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