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Distributed measurements of spectral gain saturation in Erbium-doped fibers

Jean Pierre von der Weid, Waldemar Roberto Ruziscka, A.O. Dal Forno, R. Passy, M.R.X. de Barros

Published Jul 9, 2000• 0 citations
OpenAlex

Abstract

Distributed spectral gain-saturation effects of Erbium doped fiber were measured using Coherent Reflectometry. Spectral hole burning and distributed gain are related, so that spectral performance can be improved by a proper choice of fiber length.

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Erbium-Doped Fiber Amplifiers can present holes in spectral gain in Wavelength Division Multiplexing operation. The origin of this inhomogeneous saturation behavior is still a subject of controversy. In this paper we present both an experimental methods and a gain's model. Our experimental method allow us to measure the first homogeneous linewidth of the 1.5μ\muμm erbium emission with gain spectral hole burning consistently with the other measurement in the literature and the model explains the differences observed in literature between GSHB and other measurement methods.
The gain saturation characteristics of erbium-doped fiber amplifiers, which are of importance for applications in optical fiber communications, will depend strongly on the relative importance of homogeneous and inhomogeneous saturation. We have recently reported low temperature spectral hole burning measurements in an erbium-doped fiber with an alumino-silicate core1. From these measurements the homogeneous linewidth was determined to be 11.5 nm. This is consistent with the homogeneous gain saturation observed for alumino-silicate fibers.2 For erbium-doped fibers with GeO2:SiO2 cores, on the other hand, inhomogeneous saturation effects have been reported.3