28 February 2012 Negative differential gain in 1.3um quantum dot lasers: comparison of self-heating and free carrier effects
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Abstract
A comparative study of the gain spectra of quantum-dot lasers at high carrier densities is reported. The gain spectra of quantum dot lasers under a constant junction temperature (obtained by the use of Fabry-Perot modes as a temperature gauge) and under constant heat-sink temperatures are measured. Negative differential gain, observed for the ensemble of quantum dot ground-states is shown to be mainly due to free carrier effects, where increasing dephasing effects, combined with saturated gain, result in spectral broadening and a reduction in the peak gain.
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H. Shahid, D. T. D. Childs, B. J. Stevens, R. A. Hogg, "Negative differential gain in 1.3um quantum dot lasers: comparison of self-heating and free carrier effects", Proc. SPIE 8255, Physics and Simulation of Optoelectronic Devices XX, 82550B (28 February 2012); doi: 10.1117/12.907103; https://doi.org/10.1117/12.907103
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