Fiber optic or optical fiber is referred to the medium and the technology associated with the transmission of information as light impulses along a glass or plastic wire or fiber. Fiber optic wire carries much more information than conventional copper wire and is far less subject to electromagnetic interference. In recent years it has become apparent that fibre-optics are steadily replacing copper wire as an appropriate means of communication signal transmission. Fibre-optics span the long distances between local phone systems as well as providing the backbone for many network systems.
In optical fiber technology, single-mode fiber is optical fiber that is designed for the transmission of a single ray or mode of light as a carrier and is used for long-distance signal transmission. For short distances, multimode fiber is used.
In optical fiber technology, multi-mode fiber is optical fiber that is designed to carry multiple light rays or modes concurrently, each at a slightly different reflection angle within the optical fiber core.