Editing Backscatter (section)

== In waveguides ==
The backscattering method is also employed in [[fiber optics]] applications to detect optical faults. Light propagating through a [[fiber-optic cable]] gradually attenuates due to [[Rayleigh scattering]]. Faults are thus detected by monitoring the variation of part of the Rayleigh backscattered light. Since the backscattered light [[attenuation (electromagnetic radiation)|attenuates]] [[Exponential function|exponentially]] as it travels along the [[optical fiber cable]], the attenuation characteristic is represented in a [[logarithmic scale]] [[Graph of a function|graph]]. If the [[slope]] of the graph is steep, then power loss is high. If the slope is gentle, then optical fiber has a satisfactory loss characteristic.

The loss measurement by the backscattering method allows measurement of a fiber-optic cable at one end without cutting the optical fiber hence it can be conveniently used for the construction and maintenance of optical fibers.