Typical Fiber Optic Connector Types

Connector Style

Description

Biconic

Used in singlemode and multimode assemblies.  An early connector design that is rarely used today.

D4

Used in singlemode and multimode assemblies.  A keyed, threaded connector that is rarely used today.

FC

Used in singlemode and multimode assemblies.  Used in both computer networks and telecommunications applications.

FDDI

Used in multimode assemblies for computer networks;  Always a duplex (2-fiber) assembly; Bodies are made of plastic with plastic or ceramic ferrules.

LC

Used in singlemode and multimode connector, adapters and associated components.  The LC is a small form factor (SFF) connector that is ideal for high-density applications.

MIL-Spec

Generally used in multimode assemblies.  Made of aluminum or stainless steel; Available for multiple fiber cables.  

MPO/MPT

The MPO is a multi-fiber connector suitable for high-density backplane and printed circuit board (PCB) applications for data and telecom systems. MPO/MPT connectors offer up to 12-times the density of standard fiber optic connectors that results in significant space and cost savings.

MTRJ

Used in singlemode and multimode connector, adapters and associated components.  The MTRJ is a small form factor (SFF) connector that uses a standard RJ-45 telephone plug interface providing a reliable and robust latching mechanism. The duplex ferrule concept is ideal for high-density applications.  MTRJ adapters occupy the same space as a simplex SC adapter and meet the ANSI/TIA/EIA requirements.

MU

MU connectors are small form factor (SFF) connectors that provide superior singlemode or multimode optical performance.  MU connectors are approximately half the size of a standard SC connector and feature a push-pull SC latching mechanism. In addition, MU connectors are feature low insertion losses, long-term reliability; and, repeatable performance characteristics.

SC

Used in singlemode and multimode assemblies.  Used in both computer networks and telecommunications.  Bodies are plastic with ceramic ferrules.  Their small size allows them to be densely packed in patch panels and enclosure.

SMA:

Used in multimode assemblies. Rarely used today.

SMC

The SMC connector is currently under consideration by the ANSI/TIA/EIA 604 Standards Committee as an industry standard connector.  It is designed for use with 12-fiber optic ribbon cable and is based on the MT ferrule incorporating many features of the ESCON connector design.  Three SMC connector configuration styles support jacketed and/or unjacketed cable for both internal and external applications. 

ST

Used in singlemode and multimode assemblies.  Used in both computer networks and telecommunications.  Bodies and ferrules come in different materials, including plastic and metal. 

Typical Fiber Optic Connector Ferrule Materials

Ferrule Type

Ceramic

Polymer

Stainless Steel

Polish Type

Angled PC

The end face of the connector is angled to achieve better back reflection results mechanically.  Back reflection is the same as the Enhanced Ultra PC.  Used often in CATV applications.

PC

Physical Contact.  The end face of the connector is convex. The core of the fiber is located at the high point of this surface.  Offers good basic performance. In singlemode applications the back reflection results must fall between -30 dB and -39 dB.  

Super PC

Modified PC Polish.  Back reflection of -40 dB to 49 dB.

Ultra PC

Modified PC Polish. Back reflection of -50 dB to 59 dB.  Enhanced Ultra PC-A modified PC policy that produces back reflection of -60 dB or better and is the best performance available.