The structure of GYFTY (non-metallic reinforced component, loose sheath layer twisted filling type, outdoor optical cable for polyethylene sheath communication) optical cable is to sleeve single-mode or multi-mode optical fiber into the inner filled waterproof compound loose tube made of high modulus plastic. The center of the cable core is a non-metallic reinforced core. For some fiber optic cables with a certain number of cores, the non-metallic reinforced core is also extruded with a layer of polyethylene (PE). The loose tube (and the filling rope) is twisted around the central reinforced core to form a compact and circular cable core, and the gap in the cable core is filled with water blocking compound. A layer of polyethylene sheath is extruded outside the cable core.