Optical fiber cable and core

Abstract

In accordance with the present invention, an annular insulating core member is formed from an elastomeric material surrounding a plurality of optical fibers and maintaining the group of fibers in a predetermined configuration relative to each other. More specifically, the elastomeric material is characterized by its modulus at room temperature and its bonding to each color identified optical fiber being such as to hold together said fiber configuration while allowing interfiber movement and to facilitate the exposure of the individual optical fibers upon the application of peeling forces between the elastomeric material and an optical fiber without obfuscating the color identification of the optical fibers while providing suitable mechanical properties to maintain the integrity of the fiber configuration. Additionally, the insulating core member may be incorporated into a communication cable by enclosing the core member into a sheath system with an associated strength member. For applications with high strength demands, such as undersea environments, the cable strength members may include a central elongated filament and plural layers of stranded steel wires separated from the central filament by the annular insulating core member, in which the optical fibers are embedded. Furthermore, a metallic tubular jacket preferably surrounds the stranded steel layers to provide both a DC path for powering the optical repeaters and a hermetic moisture barrier for the fibers.