GYFTY73 [Outdoor Optical Cable for Communication with Non-metallic Strengthening Member, Loose Layer Strand Filling, Polyethylene Inner Sheath, Glass Fiber Yarn Reinforcement, and Polyethylene Outer Sheath] The structure of the optical cable is to insert single-mode or multi-mode optical fibers into high-mode optical fibers. In the loose tube made of plastic and filled with waterproof compound, the center of the cable core is a non-metallic reinforcing member. For optical cables with certain core numbers, the non-metallic central reinforcing member is extruded with a layer of polyethylene. The loose tube (and filler rope) is twisted around the central strength member to form a compact and rounded core, and the gap in the core is filled with a water-blocking compound and extruded with a polyethylene inner sheath. The glass fiber yarn is reinforced and extruded into a polyethylene outer sheath to form a cable.