It has a long 2.5mm diameter ferrule made of ceramic (zirconia), stainless alloy or plastic. It is the most popular connector for multimode fiber optic LAN applications. ST connector – simplex only, twist-on mechanism. Standard fiber optic connectors – 2.5mm ferrule Below are loosely divided family types of fiber connectors which sometimes overlap. However there are also duplex and multi-fiber connector designs. The example shown above are FC connectors with a screwed-on mechanism.įiber Optic Connector Types and their applicationsīoth examples shown above are for single fiber cable (simplex) which is easy to install. The adapter body provides mechanism to hold the connector bodies such as snap-in, push-and-latch, twist-on or screwed-on. Ferrules slide into the sleeve and mate to each other. At the center of the adapter there is a cylindrical sleeve made of ceramic (zirconia) or phosphor bronze. Instead a fiber mating sleeve (adapter, or coupler) sits between two connectors. Unlike electronic connectors, most fiber optic connectors don’t have jack and plug design. Stress relief boot designs are different for 900um tight buffered fiber and 1.6mm~3mm fiber cable. Stress relief boot covers the joint between connector body and fiber cable and protects fiber cable from mechanical damage. This provides the strength for mechanical handing of the connector without putting stress on the fiber itself. Connector housing provides the mechanism for snapping into a mating sleeve (adapter) and hold the connector in place.įiber cable and strength member (aramid yarn or Kevlar) are crimped onto the connector sub-assembly body with a crimp eyelet. The end of the ferrule protrudes out of the sub-assembly body to mate with another SC connector inside a mating sleeve (also called adapter or coupler).Ĭonnector sub-assembly body is then assembled together with the connector housing. The ferrule is then assembled in the SC sub-assembly body which has mechanisms to hold the cable and fiber in place. The end of the fiber is at the end of the ferrule, where it typically is polished smooth. A 124~127um diameter high precision hole is drilled in the center of the ferrule, where stripped bare fiber is inserted through and usually bonded by epoxy or adhesive. SC connector is built around a long cylindrical 2.5mm diameter ferrule, made of ceramic (zirconia) or metal (stainless alloy). SC Connector Structure Elements in a SC connector The example shown is a SC connector which was developed by NTT (Nippon Telegraph and Telephone) of Japan. Although the mechanical design varies a lot among different connector types, the most common elements in a fiber connector can be summarized in the following picture. More than a dozen types of fiber optic connectors have been developed by various manufacturers since 1980s.
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