In order to eliminate blind spots in optical cable mechanical property monitoring and prevent hidden failures due to mechanical performance degradation

we study the theory of fiber excess length in optical cables and the monitoring principles of BOTDA and OTDR.Using the BOTDA monitoring technology

we conduct monitoring experiments for the fiber strain in the cables.In combination with theoretical analysis

we obtain the relationship of fiber strain changes with the cable stress

strain and mechanical properties

which can act as a prewarning for the potential mechanical property deterioration of optical cables.