Low-Threshold Pump Power and High Integration in Al$_{2}$O$_{3}$ : Er$^{3+}$ Slot Waveguide Lasers on SOI

We numerically investigate the potential of Al
$_{2}$
O
$_{3}$
 : Er
$^{3+}$
active slot waveguides for realizing small-form factor lasers on silicon-on-insulator. Based on recent technological improvements in the reliable and low-cost fabrication of alumina doped with high Er
$^{3+}$
concentration, we point out the possibility of realizing silicon compatible emitters at 1.55
$\mu$
m, optically pumped at 1480 nm with a few milliwatts threshold pump power.