The structure of the GYTA33 optical cable involves placing 250μm optical fibers into loose tubes made of a high-modulus material, which are filled with water-blocking compound. The gaps within the cable core are also filled with water-blocking material. After longitudinally applying an aluminum-polyethylene laminated tape, a polyethylene inner sheath is extruded. This is followed by double-layer single fine round steel wire armoring, and finally a polyethylene outer sheath is extruded to complete the cable.