Thermally induced mode coupling in rare-earth doped fiber amplifiers

We present a simple semianalytical model of thermally induced mode coupling in multimode rare-earth doped fiber amplifiers. The model predicts that power can be transferred from the fundamental mode to a higher-order mode when the operating power exceeds a certain threshold, and thus provides an exp...

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Veröffentlicht in:	Optics letters 2012-06, Vol.37 (12), p.2382-2384
Hauptverfasser:	Hansen, Kristian Rymann, Alkeskjold, Thomas Tanggaard, Broeng, Jes, Lægsgaard, Jesper
Format:	Artikel
Sprache:	eng
Schlagworte:	Amplifiers Design parameters Doped fibers Fibers Joining Mathematical models Rare earth metals Thresholds
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creator	Hansen, Kristian Rymann Alkeskjold, Thomas Tanggaard Broeng, Jes Lægsgaard, Jesper
description	We present a simple semianalytical model of thermally induced mode coupling in multimode rare-earth doped fiber amplifiers. The model predicts that power can be transferred from the fundamental mode to a higher-order mode when the operating power exceeds a certain threshold, and thus provides an explanation of recently reported mode instability in such fiber amplifiers under high average-power operation. We apply our model to a simple step-index fiber design, and investigate how the power threshold depends on various design parameters of the fiber.
doi_str_mv	10.1364/OL.37.002382
format	Article
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subjects	Amplifiers Design parameters Doped fibers Fibers Joining Mathematical models Rare earth metals Thresholds
title	Thermally induced mode coupling in rare-earth doped fiber amplifiers
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