The fibers, either of single-mode or multimode type, are placed in a loose tube made of high modulus plastic. The tubes are filled with a water-resistant filling compound. A steel wire locates in the center of the core as a metallic strength member. The tubes (and fillers) are stranded around the strength member into a compact and circular cable core. After PSP is applied around the cable core, this part of the cable accompanied by the stranded wires as the supporting part is completed with a polyethylene (PE) sheath to be figure 8 structure.