Ultrafast gain dynamics in InAs-InGaAs quantum-dot amplifiers

Ultrafast gain dynamics in InAs-InGaAs quantum-dot amplifiers

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 blea...

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Veröffentlicht in:IEEE photonics technology letters 2000-06, Vol.12 (6), p.594-596
Hauptverfasser: Borri, P., Langbein, W., Hvam, J.M., Heinrichsdorff, F., Mao, M.-H., Bimberg, D.
Format: Artikel
Sprache:eng
Schlagworte:
Absorption
Amplification
Amplifiers
Devices
Dynamics
Femtosecond
Gain
High speed optical techniques
Optical amplifiers
Optical pumping
Optical refraction
Photonics
Quantum dots
Refractive index
Stimulated emission
Temperature measurement
Ultrafast optics
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Beschreibung
Zusammenfassung: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.
ISSN:1041-1135
1941-0174
DOI:10.1109/68.849054