Patent ID: 9097868
Filing Date: 2015-08-04
Classification: G01M,G01N,G02B

Abstract:
1. A method for detecting faulty laying down of an optical cable exhibiting a measured cut-off wavelength, measured after propagation over a cable length, comprising: providing an optical cable for transmitting optical signals comprising at least one single-mode optical fiber having an attenuation equal to or larger than a first threshold value as measured when wound for one turn around a bending radius equal to or smaller than 5 mm at at least one predetermined test wavelength, the test wavelength being smaller than the measured cut-off wavelength and an attenuation smaller than a second threshold value as measured when wound for one turn around a bending radius equal to at least a minimum bending radius at an operative wavelength equal to or larger than the measured cut-off wavelength; laying the optical cable; and measuring the attenuation in the at least one optical fiber at the predetermined test wavelength.