Fibre Optic : The Future Of Wires Essay

901 WordsMar 15, 20154 Pages
Fibre optic possibly the future of wires. Made to transfer light at impressive speeds allowing the ever growing internet, faster. But it isn’t only for the internet; it can be used as a light guide in surgeries, wiring in aircraft for field networking. What materials make up fibre optic cable, and why these? • Core – The inner piece of the cable with a high refractive index. • Cladding – The outer piece of the cable with a low refractive index. • Jacket – The outer protective layer usually made of polyurethane. • Buffer – It is another protective layer usually made. A tight buffer usually consists of polymer which is coated in intimate contact with the primary coating applied during the manufacturing. So we know the core needs a higher refractive index then the cladding but what is a refractive index anyway? Well the refractive index of an optical medium (material which electromagnetic waves can transmit through) is a number without association that outlines light/ radiation that spreads through the medium. So n=c/v , n being the refractive index, c being the speed of light in the vacuum (Space) and v is the speed of light in the material. E.g. the refractive index of olive oil is 1.47 so light travels 1.33 times slower in olive oil then a vacuum. Light is contained inside the core by total internal reflection; total internal reflection is when a transmitting wave hits a medium boundary at an angle larger than the particular critical angle to the normal of the surface. This

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