A ferrule used in an optical connector includes a cavity at one end that contains a malleable disk insert. A cylindrical bore extends through the insert and supports an optical fiber. The insert is deformed after the fiber is installed in the bore so that the insert firmly grips the fiber and the walls of the cavity without adhesives. As a result, relative movement between the fiber and the ferrule is prevented despite the expansion and contraction that occur due to temperature variations.

 
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