Theoretical analysis of mode instability in high-power fiber amplifiers

Kristian Rymann Hansen, Thomas Tanggaard Alkeskjold, Jes Broeng, Jesper Lægsgaard

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    Abstract

    We present a simple theoretical model of transverse mode instability in high-power rare-earth doped fiber amplifiers. The model shows that efficient power transfer between the fundamental and higher-order modes of the fiber can be induced by a nonlinear interaction mediated through the thermo-optic effect, leading to transverse mode instability. The temporal and spectral characteristics of the instability dynamics are investigated, and it is shown that the instability can be seeded by both quantum noise and signal intensity noise, while pure phase noise of the signal does not induce instability. It is also shown that the presence of a small harmonic amplitude modulation of the signal can lead to generation of higher harmonics in the output intensity when operating near the instability threshold.
    Original languageEnglish
    JournalOptics Express
    Volume21
    Issue number2
    Pages (from-to)1944-1971
    ISSN1094-4087
    DOIs
    Publication statusPublished - 2013

    Bibliographical note

    This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-2-1944. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

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