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Fibre

​An optical fiber (or fibre in British English) is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair.[1] Optical fibers are used most often as a means to transmit light[a] 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.[2] 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.[3] Specially designed fibers are also used for a variety of other applications, some of them being fiber optic sensors and fiber lasers.[4]

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.[5] 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).[6] Multi-mode fibers generally have a wider core diameter[7] and are used for short-distance communication links and for applications where high power must be transmitted.[8] Single-mode fibers are used for most communication links longer than 1,000 meters (3,300 ft).[citation needed]

Being able to join optical fibers with low loss is important in fiber optic communication.[9] 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.[10]

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, who is widely acknowledged as the father of fiber optics.[11]

​Great Yarmouth, often called Yarmouth, is a seaside resort and minster town in Norfolk, England, straddling the River Yare, some 20 miles (30 km) east of Norwich.[2] A population of 38,693 in the 2011 Census made it Norfolk's third most populous place. Its fishing industry, mainly for herring, fell steeply after the mid-20th century and has all but vanished.[3] North Sea oil from the 1960s brought an oil-rig supply industry that now services offshore natural gas rigs. More recent offshore wind power and other renewable energy have created further support services. Yarmouth has been a seaside resort since 1760 and a gateway from the Norfolk Broads to the North Sea. Tourism was boosted when a railway opened in 1844, which gave visitors easier, cheaper access and triggered some settlement. Wellington Pier opened in 1854 and Britannia Pier in 1858. Through the 20th century, Yarmouth was a booming resort, with a promenade, pubs, trams, fish-and-chip shops and theatres, and the Pleasure Beach, the Sea Life Centre, the Hippodrome Circus and the Time and Tide Museum, and a surviving Victorian seaside Winter Garden in cast iron and glass.

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