Few tools are used to detect the fibre optic cables, such as Pipe Cable Locator with Sonde (PCL) or Duct road and Ground Penetrating Radar (GPR). This method is helpful for non-metallic detection such as drains, sewer pipes or ducts. he pipeline operator as soon as possible. Supplemented. The following models are best suited for finding Fiber Optic w/ Tracer or Shield Learn More. Damaging buried pipes and cables can be costly and dangerous. u-LOCATE allows you to quickly and accurately locate underground utilities, helping prevent costly damages, utility strikes, and service. When a fiber optic line is damaged, the effects are felt immediately and can spread quickly. Interruptions can impact hospitals, airports, utilities, financial transactions, emergency communication centers, business networks, and entire communities.