A fiber capable of switching optical states is provided. The fiber includes a laminate having a first electrode layer, a second electrode layer, and an electro-optic material between the first and second electrode layers, at least one of the first and second electrode layers being light-transmissive and a sheath surrounding the laminate. The fiber may have a ribbon-like structure, i.e. a width that is substantially greater than its thickness. The electro-optic medium may be an encapsulated electrophoretic medium.