US Patent 7697806 Fiber optic cable with detectable ferromagnetic components

A fiber optic cable with detectable ferromagnetic components may include a plurality of detectable ferromagnetic components distributed longitudinally along the cable and insulated from each other. The fiber optic cable may contain the typical layers of fiber core, cladding, coating, strengthening fibers, and cable jacket. Each of the detectable ferromagnetic components may be a ferromagnetic metal strip forming a band around the cable. The metal bands may be distributed at different locations of the cable. Other ferromagnetic materials than metal may be used, as long as they are detectable by a metal detector. The detectable ferromagnetic components may form patterns that may be identified by the metal detector.