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4. Glossary
Blaze angle
Orientation of the index periodic fluctuation with respect to the fiber's cross-sectional plane, in the case of an inclined Bragg grating.
Spectral attenuation
Characterizes signal attenuation during propagation (Beer-Lambert law). It is expressed per unit fiber length at a given wavelength, e.g. 0.2 dB/km at 1.55 µm. The transmission of silica fibers is limited by Rayleigh scattering (law in 1/λ 4 ) from UV to near IR, and by IR absorption beyond.
Sensor
A device designed to perform a specific measurement. There are different types, depending on the technology used and the quantity (measurand) they address. Every sensor contains a transducer.
CFO, Fiber optic sensor
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Bibliography
Quoted projects
European project COSMUS (Real-Time Modelling and Compensation Of Soil Movements on Underground Sites). Ref: BRPR960235; Leader: Solétanche-Bachi [France]. Partners: CEA (France), Glötzl (Germany), EPFL-LC (Switzerland), Tractebel (Belgium) and Cambridge Univ. (England).
Optical Transducer Systems. Danish project funded by the Danish National Advanced Technology Foundation. Partners: Brüel &...
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In the 90s, the players involved in manufacturing technologies and in understanding the physical phenomena underlying photo-inscription were either academics and research centers, large telecoms manufacturers, or small SMEs who had sensed an emerging need. These small private players enabled a large number of users to purchase and test this innovative technology. Then, as is often the case, some SMEs were...
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To find out more about European projects, visit the Commission's website at http://www.cordis.europa.eu or go directly to the database of past projects: http://cordis.europa.eu/search/simple_fr.
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