  We report a valley photonic crystal (VPhC) waveguide in a GaAs slab with InAs
quantum dots (QDs) as an internal light source exploited for experimental
characterization of the waveguide. A topological interface state formed at the
interface between two topologically-distinct VPhCs is used as the waveguide
mode. We demonstrate robust propagation for near-infrared light emitted from
the QDs even under the presence of sharp bends as a consequence of the
topological protection of the guided mode. Our work will be of importance for
developing robust photonic integrated circuits with small footprints, as well
as for exploring active semiconductor topological photonics.
