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Modulation response function at different values of the internal loss cross-section σ int. For our calculations, room-temperature operation of a GaInAsP structure of Ref. 20 with a single layer of QDs lasing near 1.55 μm is considered; 10% QD-size fluctuations are assumed; g max = 29.52 cm−1. α 0 = 0 and L = 1.139 mm. For all the three curves, the dc component of the injection current density j 0 = 64 kA/cm2; for the case of no internal loss, this value of j 0 is equal to and that is why the response function is flattest. The inset shows the flattest response function given by Eq. (15) vs. normalized modulation frequency ; using this universal dependence and Eq. (12) for , the flattest response function at a non-zero σ int can be easily plotted.
Modulation bandwidth vs. excess of the dc component of the injection current density over the threshold current density at different values of σ int. α 0 = 3 cm−1 and L = 1.139 mm. The “x” symbol marks the maximum point (, ) on each curve.
Maximum modulation bandwidth vs. internal loss cross-section σ int. α 0 = 3 cm−1 and L = 1.139 mm; .
Maximum modulation bandwidth vs. cavity length L. α 0 = 3 cm−1 and σ int = 2.67 × 10−17 cm2; L opt = 1.5 mm.
Highest modulation bandwidth vs. internal loss cross-section σ int. α 0 = 3 cm−1. in the figure corresponds to L = ∞ and that is why it is larger than in Fig. 3.
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