Why is drop fiber optic cable called butterfly fiber optic cable
Drop fiber optic cables are called butterfly cables because their flat, wing-shaped cross-section resembles a butterfly, with the optical fiber in the center and two parallel strength members on either side.
Design and Structure
The term "butterfly" comes from the cable's cross-sectional shape: it has a flat, wing-like profile with the optical fiber unit positioned in the center and two parallel reinforcing members flanking it on both sides . This design gives the cable a distinctive appearance similar to a butterfly's wings, which is why the name is used.
Functional Advantages
- Directional Bending: The flat shape allows the cable to bend easily in the flat plane, which is ideal for routing along walls, ceilings, or around door frames, while resisting sharp kinks when bent edge-on .
- Strength and Durability: The parallel strength members, typically made of Fiber Reinforced Plastic (FRP) or steel wire for outdoor versions, provide tensile strength and resistance to lateral pressure .
- Bend-Insensitive Fiber: Butterfly cables usually use bend-insensitive single-mode fibers (ITU-T G.657 standard), which tolerate tight bend radii without significant signal loss .
- Lightweight and Flexible: The flat design reduces weight and makes installation easier, especially in indoor FTTH applications .
Applications
Butterfly drop cables are commonly used in FTTH networks to connect the distribution point to the subscriber's terminal. Indoor versions are lightweight and flexible, while outdoor self-supporting versions include a steel messenger wire for aerial installation . They are ideal for short spans, typically up to 80 meters, and are designed for both overhead and duct installations .
Summary
The "butterfly" name reflects the flat, wing-like cross-section of the cable, which provides installation flexibility, mechanical strength, and protection for the optical fibers. This design makes it particularly suitable for the last-mile connections in fiber optic networks, combining ease of handling with reliable performance .
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