Method for recoating fiber Bragg gratings with polyimide

A new technique for recoating optical fiber with a polyimide jacket is demonstrated. Single layer coatings of 7 mu m, and double layers of 15 mu m have been applied to 125 mu m fiber. The coatings are uniform and concentric, and can be applied with no loss of original fiber strength. The technique accommodates multiple fiber diameters without the need for interchanging parts.