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3. Fiber optic attenuation measurement
Very low attenuation (theoretical minimum 0.16 dB/km) is a decisive advantage of silica optical fibers over all other material transmission media. It must therefore be precisely measured during fiber manufacture, but it must be possible to repeat these measurements throughout the life of the link, as various factors can degrade it (stresses exerted by cable materials, sharp bends, repairs...).
3.1 Causes of attenuation in optical fibers
Intrinsic attenuation comes from the physical phenomena of absorption and scattering in the core material, and translates into a linear attenuation term α, in dB/km, which means that the power transmitted at a distance L is given by :
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Fiber optic attenuation measurement
Dispersion measurements
Bibliography
Software tools
Optisystem 15.0 from Optiwave ( https://optiwave.com ): fiber optic link simulation
Comsol Multiphysics ( https://www.comsol.fr ): modeling and simulation of passive and active optical devices
Websites
Fiber Systems : https://www.fibre-systems.com
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Congrès de la Société Française d'Optique, every even-numbered year in France (2018: Toulouse): http://www.sfoptique.org/
ECOC (European Conference on Optical Communications), held every year in Europe (2018: Rome): https://www.ecoc20xx.org where...
Standards and norms
ITU (International Telecommunications Union) recommendations https://www.itu.int :
- Méthodes de test - G 650.2 - 2015)
- Fibres multimodes 50/125 à gradient d'indice - G 651.1 - 2007
- Fibre monomode standard - G 652 - 2016
- Fibre monomode à dispersion décalée - G 653 - 2010
- Fibre monomode...
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Acome (optical cables) : http://www.acome.fr
Corning (optical fibers and cables) : https://www.corning.com
Scientific equipment (measurement and testing)...
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