optical fibre - ορισμός. Τι είναι το optical fibre
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Τι (ποιος) είναι optical fibre - ορισμός

LIGHT-CONDUCTING FIBER
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  • Cross-section of a fiber drawn from a D-shaped '''preform'''
  • Colladon's "light fountain"
  • Diffuse reflection
  • An overview of the operating principles of the optical fiber
  • A [[TOSLINK]] fiber optic audio cable with red light shone in one end
  • A [[frisbee]] illuminated by fiber optics
  • acrylic]] rod, illustrating the total internal reflection of light in a multi-mode optical fiber.
  • An optical fiber lamp
  • Illustration of the modified chemical vapor deposition (inside) process
  • Light reflected from optical fiber illuminates exhibited model
  • multi-mode fibers]].
  • The propagation of light through a [[multi-mode optical fiber]].
  • An aerial optical fiber splice enclosure lowered during installation. The individual fibers are fused and stored within the enclosure for protection from damage
  • An [[optical fiber cable]]
  • Optical fiber types
  • The P<sub>4</sub>O<sub>10</sub> cagelike structure—the basic building block for phosphate glass
  • Specular reflection
  • ST connectors]] on [[multi-mode fiber]]
  • Theoretical loss spectra (attenuation, dB/km) for Silica optical fiber (dashed blue line) and typical ZBLAN optical fiber (solid gray line) as a function of wavelength (microns).
  • Experimental attenuation curve of low loss multimode silica and ZBLAN fiber. Black triangle points and gray arrows illustrate a four order of magnitude reduction in the attenuation of silica optical fibers over four decades from ~1000&nbsp;dB/km in 1965 to ~0.17&nbsp;dB/km in 2005.
  • The structure of a typical [[single-mode fiber]].<br />
1. Core: 8&nbsp;µm diameter<br />
2. Cladding: 125&nbsp;µm dia.<br />
3. Buffer: 250&nbsp;µm dia.<br />
4. Jacket: 400&nbsp;µm dia.

optical fibre         
(optical fibres)
Note: in AM, use 'optical fiber'
An optical fibre is a very thin thread of glass inside a protective coating. Optical fibres are used to carry information in the form of light.
N-VAR
optical fibre         
<communications> (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. (1997-05-26)
optical fibre         
¦ noun a thin glass fibre through which light can be transmitted.

Βικιπαίδεια

Optical fiber

An optical fiber, or optical fibre in Commonwealth English, is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair. Optical fibers are used most often as a means to transmit light between the two ends of the fiber and find wide usage in fiber-optic communications, where they permit transmission over longer distances and at higher bandwidths (data transfer rates) than electrical cables. Fibers are used instead of metal wires because signals travel along them with less loss; in addition, fibers are immune to electromagnetic interference, a problem from which metal wires suffer. Fibers are also used for illumination and imaging, and are often wrapped in bundles so they may be used to carry light into, or images out of confined spaces, as in the case of a fiberscope. Specially designed fibers are also used for a variety of other applications, some of them being fiber optic sensors and fiber lasers.

Optical fibers typically include a core surrounded by a transparent cladding material with a lower index of refraction. Light is kept in the core by the phenomenon of total internal reflection which causes the fiber to act as a waveguide. Fibers that support many propagation paths or transverse modes are called multi-mode fibers, while those that support a single mode are called single-mode fibers (SMF). Multi-mode fibers generally have a wider core diameter and are used for short-distance communication links and for applications where high power must be transmitted. Single-mode fibers are used for most communication links longer than 1,000 meters (3,300 ft).

Being able to join optical fibers with low loss is important in fiber optic communication. This is more complex than joining electrical wire or cable and involves careful cleaving of the fibers, precise alignment of the fiber cores, and the coupling of these aligned cores. For applications that demand a permanent connection a fusion splice is common. In this technique, an electric arc is used to melt the ends of the fibers together. Another common technique is a mechanical splice, where the ends of the fibers are held in contact by mechanical force. Temporary or semi-permanent connections are made by means of specialized optical fiber connectors.

The field of applied science and engineering concerned with the design and application of optical fibers is known as fiber optics. The term was coined by Indian-American physicist Narinder Singh Kapany.

Παραδείγματα από το σώμα κειμένου για optical fibre
1. The programme includes the installation of thousands of miles of new optical fibre and copper cabling.
2. The optical fibre lit up the eyeballs through the roof of the mouth.
3. Optical fibre cables would also be laid on trunk routes to increase the speed of the network.
4. June 7 2005 23÷36 Verizon Communications‘ advanced optical fibre–based services is exceeding expectations, senior executives said on Tuesday.
5. The nucleus of this network, 4,000km of optical fibre, has already been laid and will be fully commissioned later this year.