Optical fiber

Optical Fibers are glass fibers usually about 120 micrometers in diameter that are used to deliver wave signals in the form of pulses of light over distances up to 50 km without the using repeaters. These wave signals may be coded voice communications or computer data. Fiber optic communications is dependent on the principle that light in a glass medium can carry more information over longer distances than electrical signals can carry in a copper or coaxial …

…as link between telephone substations. 2) Local Area Networks (LAN's): Multimode fiber is commonly used as the "backbone" to deliver signals between the hubs of LAN's from where copper coaxial cable takes the data to the desktop. 3) Cable TV: Cable TV networks make use of optical fiber because of its very low power utilization. 4) CCTV Closed circuit television security systems make use of optical fiber because of its inbuilt security as well as the other benefits.