  We report on a process for the fiber-coupling of electrically driven
cavity-enhanced quantum dot light emitting devices. The developed technique
allows for the direct and permanent coupling of p-i-n-doped quantum dot
micropillar cavities to single-mode optical fibers. The coupling process, fully
carried out at room temperature, involves a spatial scanning technique, where
the fiber facet is positioned relative to a device with a diameter of 2 $\mu$m
using the fiber-coupled electroluminescence of the cavity emission as feedback
parameter. Subsequent gluing and UV curing enables a rigid and permanent
coupling between micropillar and fiber core. Comparing our experimental results
with finite element method simulations indicate fiber coupling efficiencies of
~46%. The technique presented in this work is an important step in the quest
for efficient and practical quantum light sources for applications in quantum
information.
