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Butterfly-shaped single-mode four-core optical fiber

Fiber optic splice closure knowledge brief Published 06 Jun 2021

Prepared for preliminary research by the RIVO OPTICAL knowledge desk. Confirm cable count, splice capacity, sealing class, tray layout, protection sleeves and installation requirements against current standards and product documentation.

A butterfly-shaped single-mode four-core optical fiber is a flat, compact fiber cable designed for FTTH applications, featuring four single-mode fibers at the center, reinforced by parallel strength members, and encased in a flexible LSZH or PVC sheath.Structure and Design

Butterfly-shaped optical fibers, also known as flat drop or butterfly FTTH cables, have a distinctive figure-eight or butterfly cross-section. The four single-mode fibers are positioned at the geometric center, while reinforcing members—either FRP (fiber-reinforced plastic) or steel—run parallel on both sides to provide tensile strength and crush resistance . The outer sheath is typically LSZH (low-smoke, zero-halogen) or PVC, offering fire safety and environmental protection for indoor and outdoor installations . This flat geometry prevents rolling and twisting, simplifying routing along walls, corners, and conduits.

Optical Fiber Characteristics

The fibers used are usually G.657A1 or G.657A2 single-mode fibers, which are bend-insensitive, allowing tight indoor routing with minimal signal loss. These fibers support high-bandwidth communication and are optimized for FTTH networks, enabling reliable last-mile connectivity . The four-core configuration allows multiple connections or redundancy in a compact cable.

Mechanical and Installation Advantages
  • Flexibility and compactness: The flat, butterfly shape reduces bending stress and simplifies installation in tight spaces .
  • Strength and durability: Parallel FRP or steel members provide high tensile strength for aerial or indoor pulling .
  • Ease of handling: The flat design prevents rolling, making splicing, stripping, and routing easier .
  • Environmental resistance: LSZH jackets reduce toxic emissions indoors, while UV-resistant PE sheaths allow outdoor deployment .
Applications

Butterfly-shaped four-core single-mode fibers are widely used in:

  • FTTH networks for residential and commercial buildings
  • Indoor and outdoor drop cables connecting distribution points to end users
  • Last-mile fiber access where space efficiency and mechanical reliability are critical
  • Environments requiring tight bending and compact routing, such as wall-mounted or conduit installations
Summary

The butterfly-shaped single-mode four-core optical fiber combines high optical performance, mechanical strength, and installation convenience. Its flat, reinforced design, bend-insensitive fibers, and LSZH or PVC sheath make it ideal for modern FTTH deployments, ensuring reliable, high-speed connectivity in both indoor and outdoor environments .

Butterfly-shaped single-mode four-core optical fiber - RIVO MULTITRADE OPTICAL SYSTEMS [PDF]

Butterfly-shaped single-mode four-core optical fiber

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This reference is intended for preliminary fiber optic splice closure research. Compatibility, splice capacity, sealing class, tray layout, protection sleeves, installation methods, test limits and applicable standards must be verified for the specific project.

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