Its job is to protect the energized phase conductors (the power-carrying wires) below from the most destructive force in nature: lightning. OPGW is, first and foremost, an exceptionally good ground wire. The primary and traditional role of the wire strung at the top of a transmission tower is to function as a static shield wire or earth wire. OPGW is, first and. The document details the design, mechanical properties, and performance characteristics of optical fiber cables, highlighting aspects such as fiber flaws, microbending, and the effects of hydrogen absorption and nuclear radiation. The optical fibers are usually in the middle of the cable in a sealed metal tube and are surrounded by steel strength members and aluminum conductors. Since the fibers are glass and immune to. The optical signals are launched through a joint into an optical fibre, usually incorporated into a cable. What are Optical fibres? An optical fibre is a dielectric. The sheath or outer sheath is the outermost protective layer in the optical cable structure, mainly made of PE sheath material and PVC sheath material, and halogen-free flame-retardant sheath material and electric tracking resistant sheath material are used in special occasions. What is more, how does OPGW work, and what is the actual.