Virginia TechAsryan, Levon V.Suris, R. A.2014-04-162014-04-162010-05-01Asryan, Levon V.; Suris, Robert A., "Upper limit for the modulation bandwidth of a quantum dot laser," Appl. Phys. Lett. 96, 221112 (2010); http://dx.doi.org/10.1063/1.34469680003-6951http://hdl.handle.net/10919/47425We derive a closed-form expression for the upper limit for the modulation bandwidth of a semiconductor quantum dot (QD) laser. The highest possible bandwidth increases directly with overlap integral of the electron and hole wave functions in a QD, number of QD-layers, and surface density of QDs in a layer, and is inversely proportional to the inhomogeneous line broadening caused by the QD-size dispersion. At 10% QD-size fluctuations and 100% overlap, the upper limit for the modulation bandwidth in a single QD-layer laser can be as high as 60 GHz. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3446968]application/pdfen-USIn CopyrightOptical modulationQuantum dot lasersSemiconductor-lasersThreshold currentRecombinationArticle - Refereedhttp://scitation.aip.org/content/aip/journal/apl/96/22/10.1063/1.3446968https://doi.org/10.1063/1.3446968