The dynamic properties of uniformly and chirpily stacked InAs–InGaAs–GaAs quantum dot lasers are analyzed in terms of relative intensity noise spectra. For uniformly stacked quantum dot laser with ground-state lasing emissions of 1.3 μm, the <i>K</i>-factor limited bandwidth is 13 GHz. The extracted differential gain and gain compression factor are 1.7 × 10<sup>-15</sup> cm<sup>2</sup> and 2 × 10<sup>-16</sup> cm<sup>3</sup>, respectively. For chirpily stacked quantum dot laser with excited-state lasing emissions of 1.2 μm, the <i>K</i>-factor limited bandwidth is 14 GHz. Yet the nonproportional dependence between resonance frequency and square root of incremental current yields differential gain of 4.3 × 10<sup>-15</sup> cm<sup>2</sup> and huge gain compression factor of 1.4 × 10<sup>-14</sup> cm<sup>3</sup>.
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