Share Email Print
cover

Proceedings Paper

Capture delay and modulation bandwidth in a quantum dot laser
Author(s): Levon V. Asryan; Yuchang Wu; Robert A. Suris
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper 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 σn = ∞. With reducing σn, ω-3 dB decreases and becomes zero at a certain non-vanishing value σnmin. This σnmin 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 σnmin 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 σn = 10-11 cm2, ω-3 dB as high as 19 GHz is attainable in a 5-QD-layer structure.

Paper Details

Date Published: 1 March 2011
PDF: 8 pages
Proc. SPIE 7947, Quantum Dots and Nanostructures: Synthesis, Characterization, and Modeling VIII, 794708 (1 March 2011); doi: 10.1117/12.874150
Show Author Affiliations
Levon V. Asryan, Virginia Polytechnic Institute and State Univ. (United States)
Yuchang Wu, Virginia Polytechnic Institute and State Univ. (United States)
Robert A. Suris, Ioffe Physico-Technical Institute (Russian Federation)


Published in SPIE Proceedings Vol. 7947:
Quantum Dots and Nanostructures: Synthesis, Characterization, and Modeling VIII
Kurt G. Eyink; Frank Szmulowicz; Diana L. Huffaker, Editor(s)

© SPIE. Terms of Use
Back to Top