tailieunhanh - Fiber Optic Telecommunication phần 5

Tham khảo tài liệu 'fiber optic telecommunication phần 5', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Fundamentals of Photonics 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 Courtesy of Siecor Inc. Figure 8-33 a SC connector b ST connector Spring Ferrule Connector body Strain relief components b 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 334 2000 University of Connecticut Fiber Optic Telecommunication because most systems use separate fibers to carry signals in each direction so it matters which fibers are connected. One simple type of duplex connector is a pair of SC connectors mounted side by side in a single case. This takes advantage of their