Abstract
The effect of the active region inhomogeneity on the spectral characteristics of InAs/InP quantum-dash (Qdash) lasers is examined theoretically by solving the coupled set of carrier-photon rate equations. The inhomogeneity due to dash size or composition fluctuation is included in the model by considering dispersive energy states and characterized by a Gaussian envelope. In addition, the technique incorporates multilongitudinal photon modes and homogeneous broadening of the optical gain. The results predict a red shift in the central lasing wavelength of Qdash lasers on increasing the inhomogeneous broadening either explicitly or implicitly, which supports various experimental observations. The threshold current density and the lasing bandwidth are also found to increase.
| Original language | English |
|---|---|
| Article number | 6157595 |
| Pages (from-to) | 608-615 |
| Number of pages | 8 |
| Journal | IEEE Journal of Quantum Electronics |
| Volume | 48 |
| Issue number | 5 |
| DOIs | |
| State | Published - 2012 |
| Externally published | Yes |
Bibliographical note
Funding Information:Manuscript received December 7, 2011; revised January 18, 2012; accepted January 29, 2012. Date of publication February 24, 2012; date of current version March 6, 2012. This work was supported in part by a Joint Program between KAUST and the University of Michigan, Ann Arbor, under KAUST-Academic Excellence Alliance 2010 Grant.
Keywords
- Inhomogeneous broadening
- quantum-dash lasers
- rate equation model
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Electrical and Electronic Engineering
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