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Standard for Butterfly-shaped Optical Cable Reinforcing Components

Fiber and communications infrastructure knowledge brief Published 30 Mar 2022

Prepared for preliminary research by the ENSAA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Reinforcing components in butterfly-shaped optical cables are designed according to industry best practices, ITU-T fiber standards, and FOA guidelines to ensure mechanical stability, impact resistance, and reliable fiber protection. Design and StructureButterfly-shaped optical cables feature a flat, wing-like cross-section with the optical fiber at the center and two parallel strength members on either side, typically made of Fiber Reinforced Plastic (FRP) or steel for aerial applications. The reinforcing components are integrated within the cable to provide: Impact resistance and lateral pressure protectionDimensional stability to maintain fiber alignmentEase of installation along walls, conduits, or aerial routes In some designs, as described in patent CN116088119A, the reinforcing component is housed in a first accommodating cavity within a protective part, which includes a closed wall and an extending part.

This configuration ensures the reinforcing member is securely positioned, improving the cable's structural reliability and resistance to bending or crushing. Material and Mechanical StandardsFRP strength members are non-metallic, providing EMI immunity and eliminating lightning risks for indoor installations. Steel wire messengers may be added for outdoor, self-supporting cables to meet aerial span requirements.

Reinforcing components must comply with mechanical performance standards, including tensile strength, crush resistance, and bend radius, often guided by ITU-T G. 657 for bend-insensitive fibers and FOA 1 Page Standards for installation practices. Industry GuidelinesITU-T Recommendations (G.

65x series) define fiber types, attenuation, and bending loss characteristics, which indirectly influence reinforcing component design to protect the fiber.

FO

A Standards provide practical guidance for fiber optic components, including reinforcing elements, ensuring that installation and mechanical protection meet field requirements. Reinforcing components are designed to fit closely with the butterfly sheath, ensuring the outer protective jacket fully encapsulates the structure for maximum durability.

Practical Considerations

Indoor butterfly cables (e.g., GJXH type) rely solely on FRP members and LSZH sheaths. Outdoor self-supporting cables (e.g., GJYXFCH/GJXFH) incorporate steel messengers alongside FRP for aerial deployment. Reinforcing components must allow minimal stress on the fiber core when bent in the flat plane, while providing a safeguard against sharp kinks when bent edge-on.

In summary, while there is no single universal standard exclusively for butterfly-shaped cable reinforcing components, their design follows ITU-T fiber specifications, FOA installation standards, and patent-based engineering practices to ensure mechanical integrity, fiber protection, and compliance with deployment requirements.

Standard for Butterfly-shaped Optical Cable Reinforcing Components - ENSAA OPTICAL NETWORKS [PDF]

Standard for Butterfly-shaped Optical Cable Reinforcing Components

CN120762177B

The invention relates to the technical field of optical fiber communication, in particular to a butterfly-shaped optical cable with an anti-deformation structure.

CN117092771A

The present invention relates to the technical field of optical cables, and in particular to a reinforced self-supporting butterfly 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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