  Edge modes in topological insulators are known to be robust against defects.
We investigate if this also holds true when the defect is not static, but
varies in time. We study the influence of defects with time-dependent coupling
on the robustness of the transport along the edge in a Floquet system of
helically curved waveguides. Waveguide arrays are fabricated via direct laser
writing in a negative tone photoresist. We find that single dynamic defects do
not destroy the chiral edge current, even when the temporal modulation is
strong. Quantitative numerical simulation of the intensity in the bulk and edge
waveguides confirms our observation.
