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Terminology / Fiber Optics and Optical Modules / Fiber Optic Connectors

Fiber Optic Connectors

Physical connectors used to terminate and join fiber optic patch cables. Common types:

  • SC (Square Connector)

A square push-pull fiber connector using a 2.5 mm ceramic ferrule. Developed by NTT; commonly used in CATV, GBIC modules, and single-mode patch cables.

  • LC (Lucent Connector)

A small-form-factor latching fiber connector using a 1.25 mm ferrule — approximately half the size of an SC connector. Used with high-density modules such as SFP and XFP.

  • FC (Ferrule Connector)

A round threaded-lock fiber connector using a 2.5 mm ferrule. Developed by NTT in 1988; commonly used in telecommunications equipment and test instruments.

  • ST (Straight Tip)

A round bayonet-lock fiber connector using a 2.5 mm ferrule. Developed by AT&T in 1988; commonly found in LAN equipment.