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Opt Lett. 2012 Jun 15;37(12):2382-4. doi: 10.1364/OL.37.002382.

Thermally induced mode coupling in rare-earth doped fiber amplifiers.

Author information

1
Department of Photonics Engineering, Technical University of Denmark Bldg. 345A, DK-2800 Kgs. Lyngby, Denmark. kryh@fotonik.dtu.dk

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.

PMID:
22739915
DOI:
10.1364/OL.37.002382

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