It is no over statement to say that fibre optic cables have revolutionised the world we live in. These cables contain numerous optical fibres that are designed to guide light along the length of the cable. The science behind how these cables are used to convert information is made up off a combination of applied science with engineering. Engineers have used the theories developed by scientists and have turned it into a practical device that is used in a wide variety of data transfer situations.
There are a number of different benefits of fibre optic data transfer. The major one is that data rates across fibre optics are very quick and as a result a large amount of data can be transferred over long distances quickly. They also improve on metal wires in that they are immune to electromagnetic interference and they experience less loss than metal wires.
Fibre optic cables are used in a huge range of scenarios such as sensors and for communications. At the core of the fibre optic is light. As the name optic suggests the optical fibre essentially works by sending a light signal down a cable. The way in which this is done is through a process of total internal reflection which in short bounces the light down the fibre in a sophisticated way that makes the light signal readable.
The fibre works as a waveguide and the way in which the light is sent down the cable effects the signal it gives at the end. There are a number of different types of fibres that support different numbers of propagation paths. Multimode fibres (MMF) support a number of different paths and fibres that support single mode paths are called single mode fibres (SMF). The multimode fibres are generally utilised with communication systems that extend to a maximum of 200 metres. For communication links that are longer than 200 metres the single mode fibre is used. This is because the multimode fibres are used where high power must be transmitted.
One of the drawbacks of fibre optic cables is that connecting them to one another or other communications devices is much harder than making a connection between an electrical wire or cable. The reason that connecting optical fibres is more complex than electrical wires is that the connections that are made between fibre optic cables need to be much more precise. The cable needs to be spliced in such a way that the ends of the fibres are not damaged and that they can be reconnected elsewhere. If they are sliced apart effectively then the ends of the cables can be fused together using an electric arc. Special connectors are used to make connections that can be moved so that it is easier to connect, disconnect and move a connection.
The scientific theories that guide the use of fibre optic cables date back over a hundred and fifty years to the 1840s when Daniel Colladon and Jacques Babinet demonstrated the principles. An Irish inventor called John Tyndall took the principles further and gave public displays using water fountains. The technology was subsequently used to help dentists illuminate the mouth to make surgical procedures in dentistry easier and the theories were used to develop lighting methods that were used for internal medical examinations.
A Fibre Optic Cable
Using fibre optic cables is still relatively new to most people at home and in large companies. These are by far one of the fastest and efficient connection cables that were ever invented. Most people will agree that having fibre optic internet connection is an impressive thing to have and it guarantees are fast connection that normal cable connections cannot live up to. These work very differently from normal wire cables, which in comparison are slower.
Fibre optic cables are made up of the core, cladding and buffer coating. They are strands of optical glasses which are thinner than one strand of human hair and are put together in a cable. This then transports digital information over greater distances than a conventional metal wire. The data transference works by light signals being sent across long distances, with the bundles put together under a jacket. They can come as single mode buffers and multi mode buffers. These are also immune to electromagnetic interferences, which metal wires are affected by causing loss of data and information.
Single mode buffers have smaller cores and usually transmit Infra-red light from laser light emissions, when transferring information across. Multi mode buffers have a larger core and like the single mode these two can transmit infra-red light only using light emitting diodes. Other fibre optic cables can be made from plastic that have an even bigger core which transmits a more visual red light across specific distances.
Metal wiring tends to transmit information at a slower rate because it does not take into consideration of interference and distance. A fibre optic cable works in the same way as if one was to shine a light down a straight and narrow hall. Imagine that this hallway is very windy and bendy, the light would then need to be reflected and bounced across using mirrors. This is exactly how fibre optics work, the light travels quickly down the core, bouncing off the cladding which does not absorb any of the light making it possible to keep it travelling over greater distances. The whole process is called total internal reflection.
The light signals that travel down can degrade; this could be due to any impurities within the glass. How much the light degrades depends on how many impurities reside within the glass fibre, therefore the purer the glass fibre, the stronger the light signal - these are usually prevalent in premium fibre optic cables.
Conventional metal cables work very differently. These are made up of strands of copper which is sheathed round with plastic. These have been used for electrical purposes by carrying electricity across. The signals carried across in copper wires tend to interfere with other fibres in the cable; these use analogue signals because this kind of wire is not always suitable for digital signals. The copper fibres are much thicker than fibre glass, therefore only a certain volume of data can be transferred at any one time. Unlike fibre optics which is much thinner and allows for much more to be crammed in at any one go.
Furthermore, copper wires are heavier, bulkier and less flexible; although they still have their uses in powering up devices and keeping things running. Fibre optic cables however, have become much more diverse and are taking over in working certain devices.
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