Thermal poling current and electrooptic evolution were studied for a standa
rd twin-hole fiber and two novel design twin-hole fibers. The poling charac
teristics were modified in the novel fibers, which had a trap or donor regi
on inside the anode hole. Modifications of the poling characteristics were
observed in both the current evolution and the electrooptic evolution. The
novel fiber designs can facilitate the tailoring of poled fiber device char
acteristics.