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Optical fibres: total internal reflection and signal degradation
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- 1-have high refractive index but are surrounded by cladding with a lower refractive index -cladding helps protect driver from scratches (which could let light escape) -the fibre is narrow so that lights always hit the boundary between the materials at an angle bigger than the critical angle (so that light can be totally internally reflected)Properties of optical fibres
- 2- Absorption by the material the fibre is made from results in loss of amplitude - Modal dispersion where light enters the fibre at different angles cause them to take different paths and causes pulse broadening -Material dispersion where light consists of different wavelengths resulting in the rays travelling at different speeds causes pulse broadeningWhat can cause a signal to be degraded
- 3A single-mode fibre stops modal dispersion -using monochromatic light stops material dispersion -using an optical fibre repeater reduces degradation caused by both absorption and dispersionHow to prevents signal degradation by dispersion and absorption
- 4Telescopes, binoculars, periscopesKnow uses of TIR
- 5More reliable, longer distances, faster speeds.Know Advantages of Optic Fibres compared to Copper Wires
- 6Maximum magnitude of displacement of the waveAmplitude
- 7The distance between two corresponding parts of a waveWavelength
- 8Cycleone complete vibration of a wave
- 9Frequencythe number of complete wavelengths that pass a point in a given time
- 10Transverse wavesA wave with vibrations perpendicular to the direction of energy transfer e.g water ripples
- 11Longitudinal wavesA wave with vibrations parallel to the direction of energy transfer e.g sound
- 12Optical fibresA thin flexible transparent fibre used to carry light pulses from one end to the other
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- Fichas sobre Sin título, creado por Tom G el 23/11/2021.
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- Tom G
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