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Article Overview

Butterfly-shaped drop cables are commonly known as FTTH butterfly optical cables, flat drop fiber cables, or indoor suspended cables.

Butterfly-shaped drop cables are a type of fiber optic cable designed for last-mile broadband delivery. Their name comes from the cable's cross-sectional profile, which resembles a butterfly: a flat, symmetrical shape with two strength members flanking a central optical fiber unit . This design allows the cable to bend easily, resist stress, and fit along walls, window frames, or conduit entries, making it ideal for indoor and outdoor installations .

Structure and Variants

The typical butterfly cable consists of:

  • Central optical fiber: Usually G.657A1 or G.657A2 single-mode fibers, which tolerate tight bends .
  • Strength members: Non-metallic (FRP or KFRP) or metallic (steel wire) components on either side of the fiber for tensile strength and protection .
  • Outer jacket: PVC or LSZH material for environmental protection . Variants include indoor and outdoor versions, with outdoor cables generally costing more due to additional protective features . The cable can be single-core for residential use or multi-core (2–4 cores) for business applications .

Advantages

Butterfly-shaped drop cables are favored for FTTH networks because they are:

  • Lightweight and compact, reducing installation effort .
  • Highly bend-resistant, suitable for tight indoor routing .
  • Easy to fix and connect in terminal boxes .
  • Cost-effective and reliable for subscriber drop connections .

Alternative Names

Depending on context and manufacturer, butterfly-shaped drop cables are also referred to as:

  • Flat drop fiber cables
  • Indoor suspended cables
  • 8-digit optical cables due to the shape of the strength members around the fiber These cables are widely used in FTTH access networks for both residential and commercial installations, providing a standard solution for last-mile fiber deployment .

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