One or more optical fibers are loosely enclosed in a tubular plastic sheath so as to be slidable with respect to the sheath. The fibers may be longer than the length of the corresponding surrounding sheath. The sheathed fibers are wound around a core and covered with a further sheath to form a. With polymethyl methacrylate as the core material, low refractive index and high transparent fluorine resin as the cladding, the whole fiber optic light cable is wrapped by a black PVC protective layer, end glow illuminated. 5mm. The Draka S670T series of Marine Shipboard armored fiber optic cables are designed especially for the harsh environments of commercial marine vessels, ofshore oil platforms, drilling rigs, and other similar applications. The double jacket construction adds a layer of protection for harsh environments.