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Indoor access to butterfly-shaped optical cable

Indoor butterfly-shaped optical cables are compact, flexible fiber optic cables designed for high-speed indoor data transmission with excellent bend resistance and easy installation.

Design and Structure

Indoor butterfly-shaped optical cables get their name from their flat, wing-like cross-section, with the optical fiber positioned in the center and two parallel Fiber Reinforced Plastic (FRP) strength members on either side, providing mechanical support without metallic components. The cable is typically sheathed in Low Smoke Zero Halogen (LSZH) material, making it safe for indoor environments and compliant with fire safety standards. Fiber counts usually range from 1 to 12 cores, suitable for single-unit residential or multi-tenant building deployments.

Key FeaturesBend-Insensitive Fiber: Most indoor butterfly cables use ITU-T G. 657 bend-insensitive single-mode fiber, allowing tight bends (as small as 10 mm radius) without signal loss, ideal for routing along walls, ceilings, or through conduits. Lightweight and Flexible: The flat, compact design allows installation in tight spaces such as data centers, risers, or wall-mounted pathways.

Electromagnetic Immunity: Being optical, these cables are immune to electromagnetic interference, making them suitable for environments with high electrical activity. Easy Installation: The flat profile and flexibility simplify routing, splicing, and termination, reducing labor and installation time. AdvantagesSpace-Saving: Compact design fits in narrow conduits and crowded indoor spaces.

High Bandwidth: Supports high-speed data transmission, up to 100 Gbps, suitable for FTTH (Fiber-to-the-Home) and FTTB (Fiber-to-the-Building) networks. Durable and Safe: LSZH sheath ensures low smoke emission and flame retardancy, while FRP members provide mechanical strength without lightning risk.

Applications

Indoor butterfly-shaped optical cables are commonly used for: FTTH/FTTB deployments: Connecting building entry points to subscriber ONTs or internal network distribution. Data centers and commercial buildings: High-density, high-speed connections in tight spaces. Indoor risers and wall-mounted pathways: Where flexibility and bend resistance are critical.

Considerations

Indoor vs Outdoor: Indoor butterfly cables (type GJXH) carry only FRP strength members, while self-supporting outdoor variants (GJYXFCH/GJXFH) include a steel messenger wire for aerial runs. Mixing indoor and outdoor cable types in a single run can create compliance issues in fire-rated penetrations. Fiber Type Selection: G.

657. A1 is suitable for most indoor installations, while A2 or B3 variants are recommended for tighter bends or conduit routing. In summary, indoor butterfly-shaped optical cables provide a reliable, high-performance solution for indoor fiber optic networks, combining compact design, bend resistance, and ease of installation for residential and commercial applications.

Indoor access to butterfly-shaped optical cable

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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