Dispersion in Optic Fibres 0.0 / 5 ? PhysicsLenses and opticsA2/A-levelAQA Created by: Ice_FoxCreated on: 12-10-22 12:17 Two main types of dispersion Modal dispersion Material dispersion 1 of 7 Why does material dispersion occur? Different wavelengths (colours of light) have different speeds 2 of 7 Consequence of material dispersion Different wavelengths arrive at different times leading to pulse broadening 3 of 7 How to prevent material dispersion Use monochromatic light 4 of 7 Why does modal dispersion occur? Different angles causes more and less direct routes through the fibre 5 of 7 Consequence of modal dispersion Some light takes a longer route so will arrive at a different time, causing pulse broadening 6 of 7 How to prevent modal dispersion Single mode fibres are narrower so all light takes the most direct route 7 of 7
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