knowledge recently gained in this field by this consortium partners within EC projects (IST GSQ, IP
ZODIAC, IP IPHOBAC) allows establishing the true potential of QD based lasers for some specific
applications. The 3D carrier confinement of QDs in particular leads to remarkable properties such as
enhanced non linear effects, which recently allowed stable mode-locking in single section Fabry Perot laser
diodes based on QDs grown on InP substrates, without resorting to a saturable absorber section.
For the last decade, Quantum Dot (QD) based lasers
and devices have been the subject of considerable interest owing to expected unique properties that result
from the 3D confinement of charge carriers and these atomic-like nanostructures can theoretically offer
superior laser performance compared to that of their Quantum Well (QW) based counterparts at a lower
cost (e.g. low threshold current, simplified control electronics,.).
Although some of the properties were
readily demonstrated, QD-based directly modulated lasers did not fully live up to their expectations.
QD based lasers