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Ultrafast gain dynamics in InAs-InGaAs quantum-dot amplifiers

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6 Author(s)
P. Borri ; Res. Center COM, Tech. Univ. Denmark, Lyngby, Denmark ; W. Langbein ; J. M. Hvam ; F. Heinrichsdorff
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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 /spl sim/100-fs time constant, making devices based on such dots promising for high-speed optical communications.

Published in:

IEEE Photonics Technology Letters  (Volume:12 ,  Issue: 6 )