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Uses of Total Internal Reflection. Optic Fibres. A ray of light is bounced along the inside of a solid glass fibre Ie it uses total internal reflection Optic fibres are made from glass or plastic with an outside coating of a material with a slightly lower refractive index. Construction .

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optic fibres
Optic Fibres
  • A ray of light is bounced along the inside of a solid glass fibre
  • Ie it uses total internal reflection
  • Optic fibres are made from glass or plastic with an outside coating of a material with a slightly lower refractive index
construction
Construction
  • Fibre Optic Core: the inner light-carrying member with a high index of refraction.
  • Cladding: the middle layer, which serves to confine the light to the core.  It has a lower index of refraction.
  • Buffer: the outer layer, which serves as a "shock absorber" to protect the core and cladding from damage.  The coating usually comprises one or more coats of a plastic material to protect the fibre from the physical environment. Sometimes metallic sheaths are added to the coating for further physical protection.
using an optic fibre
Using an optic fibre
  • An electrical signal is converted to a pulse of light
  • The light signal is sent down the fibre
  • At the receiving end the light pulse is converted back t an electrical signal
problems of thick optic fibres
Problems of thick optic fibres
  • The ray of light can take several different paths along the inside of the cable.
  • The end is result is a messy version of the original signal
  • This is called multipath dispersion
avoiding multipath dispersion
Avoiding multipath dispersion
  • The optic fibre is made with a very narrow core, so that all rays pass almost straight down the core
advantages of optic fibres
Advantages of Optic Fibres
  • Can carry huge amounts of data very quickly
  • Require fewer signal boosters than copper wires
  • Used for lighting and leisure
  • Used in medicine e.g. to light small areas and internally
  • Very difficult to ‘bug’ so are very secure for data transmission
  • Cannot ‘spark’ so safe is volatile areas