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Proceedings Paper

Rate equation modeling of current injection efficiency in 1.3-μm InAs-InGaAs quantum dot lasers
Author(s): Umesh Singh; Amit A. Dikshit; Jon M. Pikal
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Paper Abstract

Cavity length vs. inverse of slope efficiency technique is most widely used to extract the injection efficiency in semiconductor lasers which assumes that all the carriers occupy single energy level in the laser active region. However, QD lasers contain multiple higher lying energy levels in addition to the ground level and have significant carrier capture times which results in the occupation of these higher energy levels. In addition to the multiple energy levels, the density of states of each energy level is inhomogeneously broadened, which leads to the broadening of the gain spectrum as a whole. Inhomogeneous broadening is a result of the random size distribution of QDs grown by the self-assembled growth technique. In this work, we present the results of an above threshold multi-level rate equation model developed to understand the effect of inhomogeneous broadening on the measured low injection efficiencies of InAs-InGaAs based quantum-dot (QD) lasers operating at 1.3 μm.

Paper Details

Date Published: 14 March 2013
PDF: 9 pages
Proc. SPIE 8619, Physics and Simulation of Optoelectronic Devices XXI, 861926 (14 March 2013); doi: 10.1117/12.2005617
Show Author Affiliations
Umesh Singh, Univ. of Central Florida (United States)
Amit A. Dikshit, IBM India Private Ltd. (India)
Jon M. Pikal, Univ. of Wyoming (United States)


Published in SPIE Proceedings Vol. 8619:
Physics and Simulation of Optoelectronic Devices XXI
Bernd Witzigmann; Marek Osinski; Fritz Henneberger; Yasuhiko Arakawa, Editor(s)

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