The structure of GYFTY optical cable is to sleeve 250u optical fiber into a loose tube made of high modulus material, and the loose tube is filled with waterproof compound. The center of the cable core is a fiberglass reinforced plastic (FRP), with loose sleeves and (fillers) twisted around the center to form a compact and circular cable core. The gaps inside the cable core are filled with waterproof fillers. Squeeze a layer of polyethylene sheath outside the cable core to form a cable, suitable for pipelines/overhead.