The structure of GYTA53 optical cable is to put 250μm 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 metal reinforced core. For optical cables with certain core numbers, a layer of polyethylene (PE) needs to be squeezed outside the metal reinforced core. The loose tube (and filler rope) is twisted around the central strengthening core into a compact and round cable core, and the gaps in the cable core are filled with water-blocking filler. The plastic-coated aluminum strip (APL) is wrapped longitudinally and then extruded with a polyethylene inner sheath. The double-sided plastic-coated steel strip (PSP) is longitudinally wrapped and then extruded with a polyethylene sheath to form a cable.