A ferrule is a long cylinder mounted on the end of the fiber and acts as a fiber alignment tool to ensure proper fiber optic connections to either another cable or to a transmitter or receiver. Ferrules can be made of glass, metal, plastic or ceramic.

The ferrule keeps the fibers accurately aligned within the connector. Ceramic is the best material because it bonds well to glass and its expansion coefficient is close to that of the glass fibers, making it environmentally stable.

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