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Specifications and Models of 2-Core Butterfly Optical Cable

Article Overview

2-core butterfly optical cables are flat-profile FTTH cables with two optical fibers, reinforced strength members, and LSZH or PVC sheaths, designed for indoor and self-supporting outdoor deployment.

Cable Structure and Design

A 2-core butterfly optical cable features a flat, wing-shaped profile with the optical fibers positioned in the center and two parallel strength members on either side, typically made of Fiber Reinforced Plastic (FRP) or steel for added tensile strength . The flat design allows minimal stress when bent in the natural routing plane, while edge-on bending provides protection against accidental kinks . The cable is completed with a PVC or LSZH sheath, which is flame-retardant, low-smoke, and environmentally safe .

Fiber Type

These cables generally use bend-insensitive single-mode fibers, compliant with ITU-T G.657A or G652D standards . The G.657A1 variant is common for residential installations, tolerating 10–20 mm bend radii and fully compatible with legacy G.652.D infrastructure . This ensures high bandwidth and reliable communication even in tight routing conditions.

Models and Variants

2-core butterfly cables are available in indoor and self-supporting outdoor models:

  • Indoor Butterfly Cables (GJXH/GJXFH):
    • FRP strength members only
    • LSZH sheath
    • Lightweight and flexible for routing from building entry to ONT
    • Fiber counts: 1–4 cores for single-unit use, up to 12 cores for multi-tenant buildings
  • Self-Supporting Outdoor Cables (GJYXFCH/GJXFH):
    • FRP plus steel messenger wire for aerial deployment
    • Can span up to 50 meters without external support
    • Suitable for connecting utility poles to building entry points

Mechanical and Environmental Characteristics

  • Tensile strength: Provided by FRP and optional steel wire
  • Crush resistance: Two parallel strength members protect the fiber
  • Flame retardant and low-smoke sheath: LSZH or PVC
  • Lightweight and easy to strip/splice for installation and maintenance

Standards Compliance

2-core butterfly optical cables comply with international and national standards, including YD/T 1997-2009, ICEA-596, GR-409, and IEC 60794 . They are suitable for FTTX/FTTH applications, connecting central communication rooms to subscriber endpoints .

Applications

  • Indoor deployment: From building entry to ONT in residential or commercial buildings
  • Outdoor aerial deployment: Self-supporting cables connecting poles to buildings
  • FTTH networks: High-bandwidth, low-bend-loss connections for fiber-to-the-home installations In summary, 2-core butterfly optical cables offer a compact, bend-insensitive, and mechanically robust solution for both indoor and outdoor FTTH deployments, with models tailored for either lightweight indoor routing or self-supporting aerial spans.

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