Skeleton-type structured optical cable

Skeleton-type optical cables feature a central reinforcing member with optical fibers placed in plastic skeleton grooves, offering high fiber density, good lateral pressure resistance, and flexibility for FTTH/FTTB applications.

Structural Features

Skeleton-type optical cables have a central strengthening member, often made of high-modulus materials, which provides the main support for the cable. Around this central skeleton, plastic skeleton grooves are arranged to hold optical fibers or fiber ribbons in a helical or spiral pattern, preventing direct compression of the fibers and maintaining structural integrity under stress . The optical fibers can be placed in U-shaped or SZ spiral grooves, either as bundles or ribbons, and are often pre-wrapped in a dry water-blocking layer to prevent moisture ingress .

Mechanical Properties

• High lateral pressure resistance: The skeleton grooves protect fibers from flattening or deformation under external pressure .
• Good bending performance: The flexible surrounding skeleton allows the cable to bend without damaging the fibers, although the central skeleton's high modulus can limit extreme flexibility .
• Stable structure: The combination of central and peripheral skeletons ensures that fibers remain in place, reducing the risk of overproof attenuation or breakage .
• Compact design: Skeleton-type cables can achieve high fiber density with a small outer diameter, saving pipeline space and facilitating installation in constrained environments .

Advantages

• No filling grease required: The dry structure simplifies construction and reduces environmental impact .
• Convenient connection and branching: Optical fibers can be accessed through branching windows without cutting the main cable, which is ideal for FTTH/FTTB networks .
• High splicing efficiency: Pre-arranged fiber ribbons and grooves allow for faster and more reliable splicing .
• Environmental protection: The design avoids the use of oil-based fillers and supports eco-friendly deployment .

Applications

Skeleton-type optical cables are widely used in access networks, including FTTH (Fiber to the Home) and FTTB (Fiber to the Building), where high fiber density, compact size, and easy branching are critical. They are suitable for both indoor and outdoor deployment, and can be adapted for dual-purpose use depending on environmental requirements . In summary, skeleton-type optical cables combine mechanical robustness, high fiber density, and installation flexibility, making them a preferred choice for modern high-capacity communication networks.