Analyzing the fundamental properties of Raman amplification in optical fibers

Karsten Rottwitt, Jørn Hedegaard Povlsen

    Research output: Contribution to journalJournal articleResearchpeer-review

    1750 Downloads (Pure)


    The Raman response of germanosilicate fibers is presented. This includes not only the material dependence but also the relation between the spatial-mode profile of the light and the Raman response in the time and frequency domain. From the Raman-gain spectrum, information is derived related to the nonlinear refractive index due to nuclear motions and the Raman response function in the time domain. It is demonstrated that the Raman-gain coefficient may be reduced up to 60% if the signal propagates in the fundamental mode while the pump alternates between the fundamental mode and a higher order mode. A simple model shows that the time response related to the decay of phonons is significantly larger in germanate glass relative to silica glass. From the Raman gain, it is found that the contribution to the nonlinear refractive index from nuclear motions is reduced by a factor of 2 in germanate relative to silica glass.
    Original languageEnglish
    JournalJournal of Lightwave Technology
    Issue number11
    Pages (from-to)3597-3605
    Publication statusPublished - 2005

    Bibliographical note

    Copyright: 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE


    Dive into the research topics of 'Analyzing the fundamental properties of Raman amplification in optical fibers'. Together they form a unique fingerprint.

    Cite this