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Fiber Every step requires precision, starting with the core rod. This is the third in FOC’s series on doped fiber technology. The first article, “Rare Earth Doped Fibers,” reviewed the main methods for making doped-fiber preforms. The second article, “Thulium-Doped Fibers,” discussed the characteristics of thulium as a dopant and commented on the desire to achieve higher dopant concentrations.
