GYTA optical cable is constructed by placing 250μm optical fibers into loose tubes made of a high-modulus material, which are filled with a water-blocking compound. At the center of the cable core is a metal strength member; for some core-count cables, a layer of polyethylene (PE) is extruded over this strength member. The loose tubes are stranded around the central strength member to form a compact, circular cable core, with all gaps within the core filled with water-blocking filler. An aluminum-plastic laminated tape (APL) is longitudinally applied, followed by the extrusion of a polyethylene outer sheath to complete the cable.