Carrier capture delay and modulation bandwidth in an edge-emitting quantum dot laser
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. As a function of the cross-section σn of carrier capture into a QD, ω−3 dB asymptotically approaches its highest value when σn→∞ (the case of instantaneous capture). With reducing σn, ω−3 dB decreases and becomes zero at a certain nonvanishing σnmin. The use of multiple-layers with QDs significantly improves the laser modulation response—ω−3 dB is considerably higher in a multilayer structure as compared to a single-layer structure at the same dc current.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 28, 2011
- Source ID
- 10.1063/1.3571295
Entities
People
- Levon V Asryan
- Robert A. Suris
- Yuchang Wu
Organizations
- Army Research Office
- Ioffe Institute
- Russian Center for Science Information
- Virginia Tech