Introduction to Optical Cable Skeleton

Skeleton optical cables feature a central reinforcing member with optical fibers placed in plastic skeleton grooves, offering high fiber density, flexibility, and protection against external stress.Structural FeaturesSkeleton optical cables have a central reinforcing member (skeleton) made of high-modulus materials such as steel wire, aramid fiber, or high-strength synthetic fibers, which provides mechanical support and maintains cable integrity under tension or compression . Around this central skeleton, optical fibers or fiber ribbons are placed in pre-formed plastic grooves, often in a helical or spiral arrangement, allowing the fibers to move slightly within the groove. This loose placement reduces microbending and stress on the fibers . The skeleton may include a central skeleton and a peripheral skeleton, where the peripheral framework is wrapped around the central skeleton at a preset pitch, enhancing bending performance and flexibility while maintaining structural stability . The grooves can be U-shaped or SZ-spiral, and water-blocking materials such as powders or tapes may be added to prevent moisture ingress .Mechanical and Functional CharacteristicsHigh fiber density: The skeleton design allows more fibers to be packed into a smaller cable diameter, saving pipeline space .Flexibility and bending performance: The combination of a rigid central skeleton and a flexible surrounding skeleton improves bending radius and allows the cable to withstand installation stresses without fiber breakage .Protection against external forces: The skeleton grooves isolate fibers from lateral pressure and impact, preventing extrusion and microbending losses .Stable structure: The pre-formed grooves and layered skeleton design maintain fiber alignment and prevent deformation during handling or environmental changes .Ease of installation and splicing: Skeleton cables often allow direct access to individual fiber ribbons without cutting the entire cable, simplifying FTTH or FTTB deployment and reducing construction time .Environmental protection: Many skeleton cables are designed with oil-free, dry structures, reducing environmental impact and eliminating the need for filling grease .ApplicationsSkeleton optical cables are widely used in access networks, interoffice connections, and FTTH/FTTB deployments, where high fiber density, small diameter, and ease of installation are critical . Their design ensures reliable performance in both indoor and outdoor environments, including direct burial, duct, or vertical shaft installations. In summary, skeleton optical cables combine mechanical strength, fiber protection, high density, and installation convenience, making them suitable for modern high-capacity communication networks.