Thermally induced mode coupling in rare-earth doped fiber amplifiers |
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Authors: | Hansen Kristian Rymann Alkeskjold Thomas Tanggaard Broeng Jes Lægsgaard Jesper |
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Affiliation: | Department of Photonics Engineering, Technical University of Denmark Bldg. 345A, DK-2800 Kgs. Lyngby, Denmark. kryh@fotonik.dtu.dk |
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Abstract: | 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. |
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