Optical Fibers Technology.

optical fibers are made up of glass, plastics or silicaplastic fiber are least efficient, but tend to be cheaperand more reggudphysically a fiber-optic cable consists of three concentric layer inner core, a cladding around it and the outer protective coating. the inner core which has a diameter of 8 to 200 micrometers, consists of a bunch of optical fibers. the cladding around it is made of plastic or glass and has a refractive index less than that of the core. the characteristics of light propagation depend primarily on the fiber size. its construction the refractive index profile and the nature of the light source.