2. Optical Time Domain Reflectometry
2.1 Optical distance measurement
2.1.1 A reminder of propagation in optical fibers
An optical pulse propagates in the dielectric waveguide that is the optical fiber at a speed known as the group velocityv g (in m · s –1 ) equal to the speed of light in a vacuum c 0 divided by the fiber's group index n g :
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Optical Time Domain Reflectometry
Using the reflectometer for characterization
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