The pulse width is not particularly strongly widened

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Unformatted text preview: AO nCl dC n AO t Output pulse AI nCl = const nC = const t Input pulse dC r nCl nC dCl a) AI nCl = const nC = const dC r t Input pulse t Output pulse a) Profile section of step index (Multimode) b) Profile section of step index (Monomode) c) Profile section of gradient index Fig. 11.4.9: Types of optical fibres Step index fibre A step index fibre has a sharp limit between the core and cladding refraction index, the light beams can pass through the fibre in several ways (Multimode). A small input pulse is widened on passing through this fibre, because different acceptance angles produce different distances. In the case of the step index monomode fibre, only one path is possible for the light beam. The pulse retains its form to a large degree. © Festo Didactic GmbH & Co. KG • FP 1110 195 11. Physical fundamentals Gradient index With the gradient index fibre a continuous transition of the refraction index is achieved. The pulse width is not particularly strongly widened. Polymer and glass fibre-optic cables Polymer fibre-optic cables are used preferably in the red range (660 nm) and glass f...
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