a communications cable consisting of a thin glass fibre in a protective sheath. Light transmitted along the fibre may be modulated with vision, sound, or data signals See also fibre optics
(fibre optics, FO, US “fiber”, light pipe) A plastic or glass (silicon dioxide) fibre no thicker than a human hair used to transmit information using infra-red or even visible light as the carrier (usually a laser). The light beam is an electromagnetic signal with a frequency in the range of 10^14 to 10^15 Hertz.
Optical fibre is less susceptible to external noise than other transmission media, and is cheaper to make than copper wire, but it is much more difficult to connect. Optical fibres are difficult to tamper with (to monitor or inject data in the middle of a connection), making them appropriate for secure communications. The light beams do not escape from the medium because the material used provides total internal reflection.
AT&T Bell Laboratories in the United States managed to send information at a rate of 420 megabits per second, over 161.5 km through an optical fibre cable. In Japan, 445.8 megabits per second was achieved over a shorter distance. At this rate, the entire text of the Encyclopedia Britannica could be transmitted in one second. Currently, AT&T is working on a world network to support high volume data transmission, international computer networking, electronic mail and voice communications (a single fibre can transmit 200 million telephone conversations simultaneously).
See also FDDI, Optical Carrier n, SONET.
- Optical flint
noun 1. an optical glass of high dispersion and high refractive index containing lead oxide. They are used in the manufacture of lenses, artificial gems, and cut glass Also called flint glass
noun, Optics. 1. any of several types of high-quality, homogeneous, color-free glass, as flint or crown glass, having specified refractive properties, used in lenses and other components of optical systems. noun 1. any of several types of clear homogeneous glass of known refractive index used in the construction of lenses, etc See optical flint, optical […]
adjective 1. (of an internal-combustion engine) having cylinders on opposite sides of the crankcase in the same plane
[uh-pohz] /əˈpoʊz/ verb (used with object), opposed, opposing. 1. to act against or provide resistance to; combat. 2. to stand in the way of; hinder; obstruct. 3. to set as an or adversary. 4. to be hostile or adverse to, as in opinion: to oppose a resolution in a debate. 5. to set as an […]