Effect of the nonlinear saturation of the gain on the peak modulation frequency in lasers based on self-assembled quantum dots |
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Authors: | Zhukov A E Arakcheeva E M Gordeev N Yu Zubov F I Kryzhanovskaya N V Maximov M V Savelyev A V |
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Affiliation: | 1.St. Petersburg Academic University, Nanotechnology Research and Education Center, Russian Academy of Sciences, St. Petersburg, 194021, Russia ;2.Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia ; |
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Abstract: | Peak modulation frequency of lasers based on self-organized quantum dots is calculated taking into account the effect of nonlinear
gain saturation. Because of a large nonlinear gain coefficient and a reduction in the differential gain with increasing optical
losses, the peak modulation frequency is attained for an optimum loss level that is significantly lower than the saturated
optical gain in the active region. For lasers based on multiply stacked arrays of quantum dots, the peak modulation frequency
first increases with increasing number of quantum-dot layers before leveling off, with the limiting value being inversely
proportional to the nonlinear gain coefficient. |
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Keywords: | |
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