Technician examines a fibre optic cable

Technician examines a fibre optic cable

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Caption: Fibre optics. Technician examines experimental equipment used during research into data communication using fibre optic cables. A beam of green light is shining from the end of the cable (at lower centre). Optical fibres are made from flexible glass that has a high refractive index. Each fibre is then coated with an outer protective layer that has a low refractive index. The light beams that emerge from the end of each fibre have been completely internally reflected. The light may travel along the entire cable with little absorption. Bundles of optical fibres may be used to carry images, or high volumes of data such as telephone conversations.

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Keywords: cable, communications, fibre optic, fibre optics, light guide, optical fibre, optical fibres, research, technology

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