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A new type of glass fibers with optical characteristics unattainable by the conventional fiber processing method is presented. Silica glass fibers containing ZnO-Al 2 O 3 -SiO 2 (ZAS) glass-ceramics particles doped with Co 2+ in the core region of the optical fiber were developed using a silica slurry method. The ZAS glass-ceramics particles were found to be preserved in the core of the fiber even after the modified chemical vapor deposition (MCVD) process and the fiber-drawing process at high temperatures. The observed absorption bands at IR regions were due to the tetrahedral Co 2+ in the ZnAl 2 O 4 crystals of the ZAS glass-ceramics in the core of the fiber.