Ultrafast gain dynamics in InAs/InGaAs quantum dot amplifiers

Paola Borri, Wolfgang Langbein, Jørn Märcher Hvam, F. Heinrichsdorff, M.-H. Mao, Dieter Bimberg

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    The ultrafast dynamics of gain and refractive index in an electrically pumped InAs-InGaAs quantum-dot (QD) optical amplifier are measured at room temperature using differential transmission with femtosecond time resolution. Both absorption and gain regions are investigated. While the absorption bleaching recovery occurs on a picosecond time scale, the gain compression recovers with ~100-fs time constant, making devices based on such dots promising for high-speed optical communications.
    Original languageEnglish
    JournalI E E E Photonics Technology Letters
    Issue number6
    Pages (from-to)594-596
    Publication statusPublished - 2000

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    Copyright: 2000 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


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