Abstract
A study on the dynamics of gain spectral hole burning (GSHB) in a silica-based erbium-doped fiber amplifier at was performed. When a saturation signal was input into an -doped fiber, a multigain spectral hole structure that consisted of nine gain spectral holes, was observed in the wavelength region from at . As for the ion concentration dependence of these gain spectral holes, the depth of the gain spectral hole at around was found to become shallower in the silica-based erbium-doped fiber that had higher ion content. This ion concentration dependence of the gain spectral hole depth suggests that the contribution of the energy-transfer interaction between ions excited to the Stark levels within the manifold plays an important role in the gain spectral hole formation at . As far as we know, this is the first report of the ion concentration effect on the GSHB in the -doped fiber. The dynamics of GSHB is discussed in relation to the effect of energy transfer between ions. In addition, the relation between gain spectral hole structure and the Stark energy structure of ion is also discussed.
© 2005 Optical Society of America
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