Ultrafast gain and refractive index dynamics in GaInNAsSb semiconductor optical amplifiers

Piwonski, T. and Pulka, J. and Madden, G. and Huyet, G. and Houlihan, J. and Pozo, J. and Vogiatzis, N. and Ivanov, P. and Rorison, J. M. and Barrios, P. J. and Gupta, J. A. (2009) Ultrafast gain and refractive index dynamics in GaInNAsSb semiconductor optical amplifiers. Journal of Applied Physics, 106 (8). ISSN 0021-8979

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Abstract

The gain and refractive index dynamics of dilute nitride antimonide semiconductor optical amplifiers are studied using heterodyne pump probe spectroscopy, both in forward and reverse bias regimes. In the forward biased absorption regime, both gain and refractive index relax on the same timescale indicating that both quantities are linked to the same relaxation process, interband recombination. Above transparency, in the forward biased gain regime, the gain and phase exhibit differing timescales resulting in a dynamical alpha factor that varies strongly with time. Reversed bias measurements suggest a recombination dominated absorption recovery where the recovery timescale increases with increasing reversed bias, possibly due to charge separation effects.

Item Type:	Article
Additional Information:	Funding Information: The authors would like to thank Bob Manning for useful discussions, particularly on the reversed bias measurements. This study has been supported by Science Foundation Ireland under the Strategic Research Cluster PIFAS (Grant No. 07/SRC/I1173), the INSPIRE program funded by the Irish Government’s Programme for Research in Third Level Institutions, Cycle 4, National Development Plan 2007-2013, and the Institutes of Technology Ireland funding under the Technological Sector Research Strand 1 programme.
Uncontrolled Keywords:	/dk/atira/pure/subjectarea/asjc/3100
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Depositing User:	Admin SSL
Date Deposited:	19 Oct 2022 23:09
Last Modified:	07 Jun 2023 18:45
URI:	http://repository-testing.wit.ie/id/eprint/4371

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