Germanium-containing fibre optics cable

Germanium-containing fibre optics cable

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Credit: SCIENCE PHOTO LIBRARY

Caption: Germanium-containing fibre optics cable. This cable is used for transmitting data in the form of light. Within the plastic cladding is a fibre of flexible glass that has a high refractive index. Light travelling through the fibre is contained within the core of the fibre because of total internal reflection within it. This allows data to be transmitted over long distances with little or no absorption of light. This optical fibre contains glass doped with germanium dioxide to raise the refractive index. Such use of germanium (Ge) was first carried out in the 1970s. This is a TOSLINK (Toshiba Link) cable, produced by Toshiba from 1983 onwards for audio transmissions.

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