Core Weather-resistant Long-span Butterfly-shaped Optical Cable

A core weather-resistant long-span butterfly-shaped optical cable is a flat, self-supporting fiber optic cable designed for aerial and last-mile FTTH deployments, combining high tensile strength, environmental durability, and ease of installation.Structural DesignButterfly-shaped optical cables feature a flat profile with optical fibers positioned at the center and reinforced by parallel strength members on both sides, often made of FRP (fiber-reinforced plastic) or steel wire for high tensile performance . This design reduces bending stress, prevents twisting, and simplifies routing along walls, corners, and conduits . Some variants include an additional stranded steel wire for enhanced tensile support, particularly in long-span aerial installations . The cable is typically encased in a protective sheath, often LSZH (low-smoke zero-halogen) for indoor safety or UV-resistant PE for outdoor use, providing flame retardancy, water resistance, and weather durability . The sheath protects the fibers from mechanical damage, moisture, and environmental stress.Fiber and Core OptionsThese cables are available in 1-core, 2-core, 4-core, or higher fiber counts, with single-mode fibers such as G.657A1 or G.657A2 for superior bend resistance . For larger fiber counts, designs may use 12 or 24 fibers per tube to reduce environmental load and maintain performance over long spans .Performance and ApplicationsLong-span capability: Suitable for aerial deployment over distances up to 800 meters (2,600 feet) without intermediate support .Self-supporting: Can be installed on utility poles or building exteriors without additional support structures .Weather-resistant: Designed to withstand UV exposure, rain, wind, and temperature variations, ensuring reliable long-term performance .Indoor/outdoor versatility: Flat butterfly design allows use in both indoor FTTH drop installations and outdoor aerial routes .Ease of installation: Flat geometry prevents rolling, reduces labor, and allows quick deployment in tight spaces .AdvantagesHigh tensile strength prevents fiber damage during long-span aerial installation .Compact and lightweight design saves conduit space and reduces construction costs .Bend-insensitive fibers maintain signal integrity in tight routing scenarios .Environmental durability ensures performance in harsh weather conditions, including rain, UV exposure, and temperature extremes .SummaryCore weather-resistant long-span butterfly-shaped optical cables are ideal for FTTH networks, last-mile fiber access, and aerial deployments. Their combination of flat geometry, reinforced strength members, protective sheathing, and bend-insensitive fibers provides a balance of mechanical reliability, environmental resistance, and installation efficiency, making them a preferred choice for modern broadband and telecom infrastructure .