Standard value of strength for butterfly-shaped optical cables
Butterfly-shaped optical cables rely on FRP or steel strength members and are tested according to IEC 60794-1-311:2024 for tensile strength and elongation to ensure safe installation and long-term reliability.
Cable Structure and Strength Members
Butterfly optical cables feature a flat, wing-shaped cross-section with the optical fiber centered and two parallel strength members flanking it. These members are typically Fiber Reinforced Plastic (FRP) for indoor cables, providing mechanical support without electrical conductivity, or FRP combined with a steel messenger wire for outdoor self-supporting variants, allowing aerial deployment up to 50 meters without additional support (Hawellcable) . The strength members protect the fiber from bending stress, particularly in the flat plane, and prevent accidental kinks during installation.
Mechanical Standards and Testing
The IEC 60794-1-311:2024 standard specifies tensile strength and elongation tests for optical cable elements, including butterfly cables. Key parameters include:
- Tensile strength: Maximum load the cable element can withstand without failure.
- Elongation at break: The strain the cable can endure before breaking.
- Strain at yield and E modulus: Added in the 2024 edition to characterize material elasticity and deformation under load (IEC 60794-1-311:2024) . These tests ensure that both indoor and outdoor butterfly cables can withstand installation stresses, pulling forces in conduits, and long-term mechanical loads.
Indoor vs Outdoor Considerations
- Indoor cables (GJXH type): Use FRP strength members only, lightweight, flexible, and designed for routing along walls, risers, or ceilings. They are tested to handle typical installation tension without fiber damage (Hawellcable) .
- Outdoor self-supporting cables (GJYXFCH/GJXFH type): Include a steel messenger wire for aerial spans. The steel component increases tensile capacity, allowing the cable to support its own weight over longer distances while maintaining fiber integrity (Hawellcable) .
Fiber Reliability
The optical fibers themselves are bend-insensitive single-mode fibers (ITU-T G.657), which tolerate tight bend radii and reduce stress during installation. Fiber strength is proof-tested at manufacture, and spliced fibers are protected with sleeves to restore mechanical integrity (IEEE 802) . Long-term reliability is probabilistic, with standards ensuring low stress to maintain a lifetime exceeding 40 years under proper installation.
Summary
Butterfly-shaped optical cables achieve mechanical robustness through:
- FRP or steel strength members tailored to indoor or outdoor use.
- Compliance with IEC 60794-1-311:2024 for tensile strength, elongation, and elasticity.
- Bend-insensitive fibers to minimize stress during routing.
- Design geometry that naturally resists sharp kinks and distributes mechanical loads. These standards and design features collectively ensure that butterfly optical cables can be safely installed and maintain long-term performance in FTTH networks.
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