The structure of GYFTA53 optical cable is to connect 250 μ The m fiber is positioned in a loose high modulus sleeve. These pipes are filled with a waterproof filling material. FRP, as a non-metallic strength component, is located at the center of the optical cable. The pipeline (and filler) is twisted around the strength component, forming a compact circular cable core. Add a layer of aluminum plastic composite tape (APL) around the cable core to protect the cable from water intrusion. Then cover the cable core with a thin layer of polyethylene inner sheath. After applying the steel strip (PSP) longitudinally to the inner sheath, add the outer sheath PE.