Ultrafast gain dynamics in InAs-InGaAs quantum-dot amplifiers
- 1 June 2000
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 12 (6) , 594-596
- https://doi.org/10.1109/68.849054
Abstract
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.Keywords
This publication has 11 references indexed in Scilit:
- Carrier energy relaxation by means of Auger processes in InAs/GaAs self-assembled quantum dotsApplied Physics Letters, 1999
- Heterodyne pump-probe and four-wave mixing in semiconductor optical amplifiers using balanced lock-in detectionOptics Communications, 1999
- Dephasing in InAs/GaAs quantum dotsPhysical Review B, 1999
- Phonon-assisted capture and intradot Auger relaxation in quantum dotsApplied Physics Letters, 1999
- Light emission spectra of columnar-shaped self-assembled InGaAs/GaAs quantum-dot lasers: Effect of homogeneous broadening of the optical gain on lasing characteristicsApplied Physics Letters, 1999
- Excited-state radiative lifetimes in self-assembled quantum dots obtained from state-filling spectroscopyPhysical Review B, 1999
- Enhanced modulation bandwidth (20 GHz) of In/sub 0.4/Ga/sub 0.6/As-GaAs self-organized quantum-dot lasers at cryogenic temperatures: role of carrier relaxation and differential gainIEEE Photonics Technology Letters, 1998
- Effect of carrier emission and retrapping on luminescence time decays in InAs/GaAs quantum dotsPhysical Review B, 1997
- Room-temperature continuous-wave lasing from stacked InAs/GaAs quantum dots grown by metalorganic chemical vapor depositionApplied Physics Letters, 1997
- Subpicosecond gain and index nonlinearities in InGaAsP diode lasersOptics Communications, 1994