Capture delay and modulation bandwidth in a quantum dot laser

Levon V. Asryan; Yuchang Wu; Robert A. Suris

doi:10.1117/12.874150

1 March 2011 Capture delay and modulation bandwidth in a quantum dot laser

Levon V. Asryan, Yuchang Wu, Robert A. Suris

Proceedings Volume 7947, Quantum Dots and Nanostructures: Synthesis, Characterization, and Modeling VIII; 794708 (2011) https://doi.org/10.1117/12.874150
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

We show that the carrier capture from the optical confinement layer into quantum dots (QDs) can strongly limit the modulation bandwidth ω_{-3 dB} of a QD laser. Closed-form analytical expressions are obtained for ω_{-3 dB} in the limiting cases of fast and slow capture. ω_{-3 dB} is highest in the case of instantaneous capture into QDs, when the cross-section of carrier capture into a QD σ_n = ∞. With reducing σ_n, ω_{-3 dB} decreases and becomes zero at a certain non-vanishing value σ_n^min. This σ_n^min presents the minimum tolerable capture cross-section for the lasing to occur at a given dc component j₀ of the injection current density. The higher is j₀, the smaller is σ_n^min and hence the direct modulation of the output power is possible at a slower capture. The use of multiple layers with QDs is shown to considerably improve the modulation response of the laser - the same ω_{-3 dB} is obtained in a multi-layer structure at a much lower j₀ than in a single-layer structure. At a plausible value of σ_n = 10^-11 cm², ω_{-3 dB} as high as 19 GHz is attainable in a 5-QD-layer structure.

Citation Download Citation

Levon V. Asryan, Yuchang Wu, and Robert A. Suris "Capture delay and modulation bandwidth in a quantum dot laser", Proc. SPIE 7947, Quantum Dots and Nanostructures: Synthesis, Characterization, and Modeling VIII, 794708 (1 March 2011); https://doi.org/10.1117/12.874150

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