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Rayleigh timing after the change of scattering light signal intensity, accurate measurement of the
fiber optic cable to the loss distribution, the quality of the connection properties.
According to the theory of light transmission, when the light is in the process of
communication, there are two kinds of transmission medium with different refractive index
boundary (such as fracture or connector, fiber end), will Fresnel reflection, through the regular
reception of this Fresnel reflection signal, can be accurately located along the length of the fiber
discontinuous point. The size of the reflection depends on the refractive index difference and the
smoothness of the boundary surface.
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