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.