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Proceedings Paper

Gain compression coefficient and above-threshold linewidth enhancement factor in InAs/GaAs quantum DFB lasers
Author(s): H. Su; L. Zhang; A. L. Gray; R. Wang; P. M. Varangis; L. F. Lester
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Paper Abstract

We measure, for the first time, the gain compression coefficient and above-threshold linewidth enhancement factor (alpha parameter) in quantum dot (QD) distributed feedback lasers (DFB) by time-resolved-chirp (TRC) characterization. The alpha parameter is measured to be 2.6 at threshold and increases to 8 when the output power of the QD DFB is increased to 3 mW. The dependence of the above-threshold alpha parameter on the optical power is found to be stronger than the optical gain compression effect alone can predict. The inhomogeneous gain broadening, gain saturation at the ground states and carrier filling in the excited states in QDs are proposed to explain the results.

Paper Details

Date Published: 28 April 2005
PDF: 8 pages
Proc. SPIE 5722, Physics and Simulation of Optoelectronic Devices XIII, (28 April 2005); doi: 10.1117/12.591105
Show Author Affiliations
H. Su, CHTM/Univ. of New Mexico (United States)
L. Zhang, Zia Laser, Inc. (United States)
A. L. Gray, Zia Laser, Inc. (United States)
R. Wang, Zia Laser, Inc. (United States)
P. M. Varangis, Zia Laser, Inc. (United States)
L. F. Lester, CHTM/Univ. of New Mexico (United States)


Published in SPIE Proceedings Vol. 5722:
Physics and Simulation of Optoelectronic Devices XIII
Marek Osinski; Fritz Henneberger; Hiroshi Amano, Editor(s)

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