An optical fiber draw system that prints one or more fiber identifiers on optical fibers is described. In one example, the optical fiber draw system includes a draw furnace, a coating device, a marking device, and a lighting device. The draw furnace generates a glass fiber from a glass preform and the coating device is configured to apply a curable coating composition to the glass fiber. The lighting device applies an ultraviolet or other curing light to form a coating from the curable coating composition. The application and curing of a curable coating composition can be completed one or more times to form one or more coatings on the glass fiber. The marking device applies a tracer marking fluid to a curable coating composition or coating and can be placed at one or more positions along the process pathway.

An optical fiber draw system that prints one or more fiber identifiers on optical fibers is described. In one example, the optical fiber draw system includes a draw furnace, a coating device, a marking device, and a lighting device. The draw furnace generates a glass fiber from a glass preform and the coating device is configured to apply a curable coating composition to the glass fiber. The lighting device applies an ultraviolet or other curing light to form a coating from the curable coating composition. The application and curing of a curable coating composition can be completed one or more times to form one or more coatings on the glass fiber. The marking device applies a tracer marking fluid to a curable coating composition or coating and can be placed at one or more positions along the process pathway.