Stranded optical cable skeleton optical cable

Stranded optical cables feature multiple loose tubes twisted around a central strength member, while skeleton optical cables use plastic grooves to hold fibers or ribbons, offering compactness and high fiber density.Stranded Optical CableStranded optical cables consist of multiple secondary-coated optical fiber loose tubes twisted around a central metal reinforcing member to form a circular core. The core is wrapped with composite aluminum tape, polyethylene inner sheath, water-blocking tape, and corrugated steel or aluminum tape, followed by a polyethylene outer sheath . Key characteristics include:High fiber count and easy control of excess fiber lengthGood mechanical and environmental performance, suitable for direct burial, duct laying, and aerial installationLayered protection ensures durability and buffering against mechanical stress Stranded cables are often used in outdoor environments where flexibility, robustness, and high fiber capacity are required.Skeleton Optical CableSkeleton optical cables, also called skeleton-type fiber optic ribbon cables, place optical fibers or ribbons in U-shaped or SZ-shaped plastic grooves on a central reinforcing member. The grooves are wrapped with water-blocking tape to form a closed cavity, and a polyethylene outer sheath is added . Advantages include:Compact structure with small diameterHigh fiber density, capable of thousands of coresNo need to remove water-blocking grease during splicing, improving splicing efficiencyGood flattening resistance, reducing fiber stress during installation Disadvantages are complex manufacturing, requiring dedicated skeleton production lines and multiple process steps, making them more technically challenging and costly .ComparisonFeatureStranded Optical CableSkeleton Optical CableFiber arrangementLoose tubes twisted around central memberFibers/ribbons in plastic skeleton groovesFiber densityModerate to highVery high (thousands of cores)Cable diameterLargerSmaller, compactInstallationFlexible, suitable for burial, duct, aerialCompact, efficient splicing, limited outdoor flexibilityManufacturing complexityStandardHigh, requires specialized equipmentMechanical performanceGood buffering and shock resistanceExcellent flattening resistance, high splicing efficiencyApplicationsStranded cables: Outdoor networks, long-distance transmission, aerial and duct installationsSkeleton cables: High-density backbone networks, data centers, and environments requiring efficient splicing and compact design Both cable types are designed to protect optical fibers while maintaining signal integrity, but the choice depends on fiber count, installation environment, and mechanical requirements .