Ultrafast gain dynamics in InP quantum-dot optical amplifiers

Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023, Cesari, Valentina, Masia, Francesco ORCID: https://orcid.org/0000-0003-4958-410X, Krysa, Andrey, Borri, Paola ORCID: https://orcid.org/0000-0002-7873-3314 and Smowton, Peter Michael ORCID: https://orcid.org/0000-0002-9105-4842 2010. Ultrafast gain dynamics in InP quantum-dot optical amplifiers. Applied Physics Letters 97 (21) , 211103. 10.1063/1.3518715

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Abstract

We measured the gain dynamics at the ground-state transition in an electrically pumped InP/AlGaInP quantum-dot optical amplifier at room temperature by femtosecond differential transmission. The gain shows an ultrafast recovery within 200 fs, even faster than in state-of-the-art InAs/GaAs quantum-dot amplifiers. This finding, likely to be due to the less confined and more closely spaced hole levels in InP dots, is promising for optical signal processing at high bit rates. We furthermore measured the pump-induced refractive index changes and deduced a linewidth enhancement factor similar to the one in InAs/GaAs quantum dots.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy Biosciences
Subjects:	Q Science > QC Physics
Uncontrolled Keywords:	aluminium compounds, gallium compounds, ground states, high-speed optical techniques, III-V semiconductors, indium compounds, optical pumping, quantum dot lasers
Publisher:	American Institute of Physics
ISSN:	0003-6951
Funders:	EPSRC
Last Modified:	05 May 2023 06:30
URI:	https://orca.cardiff.ac.uk/id/eprint/17976

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