Design of Optical Fiber Ribbon Cord

摘要

The growing of optical communications system in recent years has increased a count of indoor optical fiber cable. When the count is demanded to reach over 72 cores, optical fiber ribbon cable is usually chose. The main reason is that optical fiber ribbon cable including many optical fibers may be provided with smaller outer-diameter. Generally, the structure of indoor optical fiber ribbon cable is that a layer of halogen-free flame retardant sheath covers fibers and aramid yarn. The sheath can expand or contract as environment temperature changes. If cable contains more fibers, the fibers might be stressed and the attenuation loss value might rise. This paper introduces a new structure of optical fiber ribbon cable for indoor use, which has two layer of sheathes. Inner layer is made of polyester material and outer layer is halogen-free flame retardant sheath. The aramid yam is mounted between two layer sheathes. This cable structure not only protects fibers from producing strain but also meets specifications. A variety of tests concerning optical transmission loss characteristics, mechanical characteristics, and fire-resistance characteristics have been performed on the cable structure mentioned above. It has confirmed that this cable structure possesses excellent characteristics.