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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