Optical cable having at least one fibre-shaped optical waveguide

摘要

In the optical cable having at least one fibre-shaped optical waveguide, measures are provided for detecting unauthorised taps. For this purpose, the optical waveguide has a numerical aperture with a value of less than 0.1. As a result, the mode number conducted is small in every case, and the disturbing effect of a tap can be kept as great as possible so that the tapping point can easily be determined.