Digital data are worldwide exchanged via fibre-optic cables at the speed of light.

Data transmission - Comment on 2014 August 20 (2)

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Fibre-optic cables have a solid core with a high index of refraction, which is wrapped by a glass with smaller index of refraction. At the transition between the glasses occurs the so-called total reflection. That means that a light beam in the core is there again and again refracted to the inside, without losing energy and with it light intensity in this process. Read more:

Spiritual writings call upon us to think about what light actually is.

I refer here to Waves and 2013 Dec 26 (2) Photoelectric effect not visible light.

Extracts from an article follow, which bring a couple of details about light and about the transmission of data:

 

Physicists develop fibre-optic cable for UV light

Data transmission

The new fibre-optic has a hole in the middle

Scientists of the Max Planck Institute have developed a fibre-optic cable for the transmission of UV light. It could one day be employed in quantum computers. Its secret: a hole in the middle.

Up to now fibre-optic cables only work for the transmission of visible and infrared light.

Digital data are worldwide exchanged via fibre-optic cables with the speed of light. Fibre-optic cables have a solid core with a high index of refraction, which is wrapped by a glass with smaller index of refraction. At the transition between the glasses occurs the so-called total reflection. That means that a light beam in the core is there again and again refracted to the inside, without losing energy and with it light intensity in this process.

This form of light and data transmission works however only with visible and infrared light but not with ultraviolet light (UV). This is quite strongly absorbed by normal glass fibres, which then can even lead to the destruction of the glass. Consequently predominantly infrared light is on the way in the worldwide date networks.

For many applications, for instance for lab experiments with UV light, it would nevertheless be advantageous to have glass fibres available, which can pass on ultraviolet light. Scientists at the Max Planck Institute for the physics of light in Erlangen have developed a special glass fibre for UV light.

The most obvious difference to the normal glass fibre is that the UV fibre is hollow. In the middle it has a hole of 20 micro meter diameter. And also beyond its hollow axis the new fibre consists of not simply a homogeneous material. The fibre rather has a special pattern of regularly arranged triangles and hexagons. Scientist describe that as "Kagomé" structure.

 

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