(from the article `erbium`) ...rare-earth metal of the lanthanoid series of the periodic table. Erbium is a grayish silver element that also occurs as a series of pink ... Cables made of optical fibres first came into operation in the mid-1970s. In a fibre-optic cable, light signals are transmitted through thin fibres ... ...transmis...
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http://www.britannica.com/eb/a-z/f/21
A cable that contains many glass fibres. Light travels through the fibres carrying digital data so that many signals can be transmitted simultaneously.
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(NETWORK GLOSSARY) Thin, flexible, medium capable of conducting modulated light transmission.
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The transparent fibres of glass or plastic that are enclosed by material of a lower index of refraction and that transmit light throughout their length by internal reflections. These fibres are bundled into cables and are capable of transmitting very large amounts of digital information (data) in both directions with very little loss in signal qual...
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https://www.encyclo.co.uk/local/20812
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