Fiber Optic Telecommunication phần 5 ppsx

F UNDAMENTALS OF P HOTONICS

334 © 2000 University of Connecticut

C. Connectors

Many types of connectors are available for fiber optics, depending on the application. The most

popular are:

SC—snap-in single-fiber connector

ST and FC—twist-on single-fiber connector

FDDI—fiber distributed data interface connector

In the 1980s, there were many different types and manufacturers of connectors. Today, the

industry has shifted to standardized connector types, with details specified by organizations

such as the Telecommunications Industry Association, the International Electrotechnical

Commission, and the Electronic Industry Association.

Snap-in connector (SC)—developed by Nippon Telegraph and Telephone of Japan. Like most

fiber connectors, it is built around a cylindrical ferrule that holds the fiber, and it mates with an

interconnection adapter or coupling receptacle. A push on the connector latches it into place,

with no need to turn it in a tight space, so a simple tug will not unplug it. It has a square cross

section that allows high packing density on patch panels and makes it easy to package in a

polarized duplex form that ensures the fibers are matched to the proper fibers in the mated

connector (Figure 8-33a).

(a) (b)

Courtesy of Siecor, Inc.

Figure 8-33 (a) SC connector (b) ST connector

Twist-on single-fiber connectors (ST and FC)—long used in data communication; one of

several fiber connectors that evolved from designs originally used for copper coaxial cables (see

Figure 8-33b)

Duplex connectors—A duplex connector includes a pair of fibers and generally has an internal

key so it can be mated in only one orientation. Polarizing the connector in this way is important