Two-core butterfly-shaped drop fiber optic cable
A two-core butterfly-shaped drop fiber optic cable features two single-mode fibers at the center, flanked by parallel FRP strength members, encased in a flat LSZH sheath for indoor FTTH deployment.
Cable Structure
The cable has a flat, wing-shaped (butterfly) cross-section, designed to minimize stress on the fiber during installation. At the center are two single-mode optical fibers, typically G.657A1 or G.657A2, which are bend-insensitive and suitable for tight-radius routing in indoor environments ( ). On either side of the fiber cores are parallel FRP (fiberglass reinforced plastic) rods that act as strength members, providing mechanical support and protecting the fibers from compression or pulling forces ( ). The entire assembly is encapsulated in a durable LSZH (Low Smoke Zero Halogen) jacket, which is flame-retardant and safe for indoor use, especially in public or commercial buildings where fire codes are strict ( ).
Key Specifications
- Fiber Type: Single-mode G.657A1 or G.657A2, optimized for small bending radii and high bandwidth ( ).
- Strength Members: Two parallel FRP rods, non-metallic for safety and lightning protection ( ).
- Sheath Material: LSZH, providing low smoke emission and halogen-free flame resistance ( ).
- Cable Dimensions: Typically around 2.0×3.0 mm, compact for tight spaces ( ).
- Bending Radius: Minimum design radius of approximately 7.5 mm, allowing flexible routing along walls, door frames, or conduits ( ).
- Temperature Range: Operation from –40°C to +70°C, installation from –10°C to +60°C ( ).
Applications
- FTTH Indoor Wiring: Direct connection from the LAN to end-user devices.
- Residential and Commercial Buildings: Ideal for apartments, offices, and multi-dwelling units (MDUs).
- Access Networks: Suitable for broadband, telecommunications, cable TV, and radio signal distribution ( ).
Advantages
- Bend-Insensitive Fibers: Reduces signal loss in tight corners or small-radius bends.
- Mechanical Protection: FRP rods provide compressive strength and prevent fiber breakage.
- Compact and Lightweight: Easy to handle, peel, and install in indoor environments.
- Fire Safety Compliance: LSZH sheath ensures low smoke and halogen-free performance.
- Simplified Installation: Flat butterfly design allows easy routing along walls or through conduits without kinking the fibers ( ).
Summary
The two-core butterfly-shaped drop fiber optic cable is a specialized indoor FTTH cable designed for high-performance, safe, and flexible fiber deployment. Its combination of bend-insensitive fibers, FRP strength members, and LSZH sheath makes it ideal for residential and commercial installations where space is limited and fire safety is a priority ( ).
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