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). p. 5.

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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. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3246781]

Item Type: Article
Additional Information: ISI Document Delivery No.: 513XS Times Cited: 0 Cited Reference Count: 18 Piwonski, T. Pulka, J. Madden, G. Huyet, G. Houlihan, J. Pozo, J. Vogiatzis, N. Ivanov, P. Rorison, J. M. Barrios, P. J. Gupta, J. A. Science Foundation Ireland under the Strategic Research Cluster PIFAS [07/SRC/I1173]; Irish Government's Programme for Research in Third Level Institutions; National Development Plan 2007-2013; Institutes of Technology Ireland funding under the Technological Sector Research Strand 1 programme 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. AMER INST PHYSICS MELVILLE
Uncontrolled Keywords: CONTINUOUS-WAVE OPERATION LASER-DIODES QUANTUM-WELLS 1.55-MU-M GROWTH GAAS NM
Departments or Groups: Optics Research Group
Divisions: School of Science > Department of Computing, Maths and Physics
Depositing User: John Houlihan
Date Deposited: 19 Nov 2012 16:20
Last Modified: 22 Aug 2016 10:26
URI: http://repository.wit.ie/id/eprint/1998

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