Optimizing Yb concentration of fiber amplifiers in the presence of transverse modal instabilities and photodarkening

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    Abstract

    The Yb concentration of double-clad optical fiber amplifiers is numerically optimized with respect to maximizing the transverse modal instability threshold in the presence of absorption arising from photodarkening. The pump cladding area is scaled with the Yb concentration to approximately maintain the pump absorption in operation. It is found that approximate analytical expressions can predict the optimized concentration levels found in numerical simulations with sufficient accuracy to be useful in fiber design. (C) 2016 Optical Society of America
    Original languageEnglish
    JournalApplied Optics
    Volume55
    Issue number8
    Pages (from-to)1966-1970
    ISSN1559-128X
    DOIs
    Publication statusPublished - 2016

    Bibliographical note

    © 2016 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.

    Keywords

    • OPTICS
    • GAIN SATURATION
    • DOPED SILICA
    • POWER
    • THRESHOLD
    • DEPENDENCE

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