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Optical Amplifiers and Their Applications

Spectral Gain Hole-Burning in an Erbium-Doped Fiber Amplifier with GeO2:SiO2 Core

J.L. Zyskind, E. Desurvire, James W. Sulhoff, David J. DiGiovanni

Published Jan 1, 1990• 5 citations
Publisher

Abstract

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

DOI
10.1364/oaa.1990.md4

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Optical Fiber Communication Conference•Jan 1, 1991•1 citation
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
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.
Germanosilicate glass shows inhomogeneous saturation behavior,1 whereas aluminogermanosilicate glass shows homogeneous behavior.2 Zemon et al.3 have published a study of nonresonant fluorescence line narrowing (FLN), but their spectra show little evidence of significant spectral narrowing by site selection. Spectral hole-burning spectroscopy has been applied by Desurvire et al.4 on Er3+ in aluminosilicate fiber. They extracted an inhomogeneous linewidth Γin of 12.5 nm and a homogeneous linewidth Γh of 115 nm.