Self-supporting butterfly-shaped optical cable

A butterfly-shaped self-supporting optical cable is a versatile fiber-optic cable designed for both indoor and outdoor use, featuring a central optical fiber unit flanked by parallel strength members for mechanical stability and easy installation.

Design and Structure

Butterfly-shaped self-supporting optical cables consist of a central optical fiber unit wrapped in a constant-section bow-type sheath, with parallel non-metallic strength members (typically FRP – Fiber Reinforced Plastic) on both sides to enhance compression resistance and protect the fibers . Some designs include a single steel wire strength member for superior tensile performance . The cable is encased in a low smoke zero halogen (LSZH) flame-retardant sheath, which is environmentally friendly and suitable for indoor and outdoor deployment . Cable separation yarns are often included between the external protective layer and the optical core to facilitate stripping and splicing .

Applications

These cables are widely used in access networks for FTTH (Fiber to the Home), FTTB (Fiber to the Building), and FTTO (Fiber to the Office) deployments . In outdoor sections, the cable can be installed as a self-supporting aerial cable, while the suspension wire components can be removed before indoor entry, allowing the cable to transition seamlessly into a butterfly-shaped indoor drop cable compatible with quick-connect or cold splice connectors .

Advantages

• Mechanical robustness: Parallel reinforcers and steel wire members provide uniform stress distribution and high tensile strength .
• Ease of installation: Lightweight, simple structure, and easy stripping for splicing and maintenance .
• Bend resistance: Specialized optical fibers enhance bandwidth and network performance .
• Indoor/outdoor versatility: Can be deployed overhead outdoors and transitioned indoors without additional cabling .
• Environmental safety: LSZH sheath reduces smoke and halogen emissions in case of fire .

Market Insights

The global market for self-supporting butterfly optical fiber cables is growing rapidly, driven by FTTH expansion, 5G rollouts, and high-capacity data demands . In 2025, the market was valued at approximately USD 945.5 million, with steel wire strength members accounting for the largest share (53.6%) and FRP members representing 34.84% . The market is projected to reach USD 1.56 billion by 2032, reflecting a CAGR of 7.42% . Rising fiber costs and demand for bend-insensitive fibers are increasing the importance of optimized cable architecture for reliable, long-term deployments .

Summary

Butterfly-shaped self-supporting optical cables combine mechanical strength, flexibility, and ease of installation, making them ideal for modern fiber-optic access networks. Their design allows seamless transition from outdoor aerial deployment to indoor drop connections, supporting high-speed broadband and efficient last-mile connectivity while maintaining durability and environmental safety .