Abstract
The spontaneous emission spectra of a 1.28μm InAs/GaAs QD (Quantum Dot) Fabry-Pérot laser device has been measured under continuous wave operation at a fixed junction temperature of 300K. At low carrier densities, empirically observed static peak wavelength position and a fixed spectral shape of the spontaneous emission spectra are indicative of the random-like population distribution rather than a global Fermi level in the system. A theoretical model based on the Monte-Carlo method has been shown to have good agreement with the empirical results. In addition the evolutions of spontaneous emission spectral shapes are also explained in terms of many body effects.
Highlights
The InAs/GaAs based QD lasers are currently being commercialized [1] for FTTH (Fiber to the Home) applications
This paper presents an empirical analysis and a theoretical model to describe the carrier distribution as a function of current density among dots
In order to derive the spontaneous emission spectra, the electroluminescence spectra are retrieved as a function of current density
Summary
The InAs/GaAs based QD lasers are currently being commercialized [1] for FTTH (Fiber to the Home) applications. The QDs of the same size (inhomogeneous line width ~0), isolated from each other without wetting layer [11] and with state separation more than thermal activation energy (kT=26meV at 300K in InAs/GaAs dots) are suggestive of exhibiting a random carrier distribution trend. In this case, as is theoretically expected that the spectral shapes of the luminescence intensity from each dot and peak intensity wavelength for each of the radiative state would remain unchanged. Important information about the spectral shapes due to many body effects and peaks of the spontaneous emission spectra is retrieved as a function of increased current density steps to access the carrier distribution trends among the dots
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