Mr. Yuchang Wu Profile

Yuchang Wu

at Virginia Polytechnic Institute and State Univ

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Proceedings Article | 1 March 2011 Paper

Capture delay and modulation bandwidth in a quantum dot laser

Levon Asryan, Yuchang Wu, Robert Suris

Proceedings Volume 7947, 794708 (2011) https://doi.org/10.1117/12.874150

KEYWORDS: Modulation, Quantum dots, Quantum dot lasers, Semiconductor lasers, Photons, Multilayers, Laser development, Quantum wells, Laser applications, Laser damage threshold

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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.

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