FTTH バタフライ光ケーブル: 実用的な設計、設置、導入ガイド

What Are FTTH Butterfly Optic Cables

FTTH Butterfly Optic Cables, also known as flat drop fiber cables, feature a compact flat profile with optical fibers placed at the center and reinforced by parallel strength members on both sides. The outer sheath is typically LSZH or PVC, optimized for indoor and outdoor environments. This structural design enhances tensile strength while maintaining flexibility, which is critical for residential and commercial fiber access networks.

These cables are widely used in FTTH networks, fiber optic drop cable systems, and building entry solutions where space efficiency and mechanical reliability are required. Compared to traditional round cables, the butterfly configuration reduces bending stress and simplifies routing along walls, corners, and conduits.

Structural Design and Materials

Core Fiber Options

FTTH Butterfly Optic Cables typically use single-mode fibers such as G.657A1 or G.657A2, which offer superior bend resistance. These fibers are optimized for tight indoor routing and reduce signal loss in compact installation environments.

Strength Members and Sheathing

• FRP or steel wire strength members provide high tensile performance for aerial and indoor pulling.
• LSZH jackets improve fire safety and reduce toxic emissions in indoor fiber optic installations.
• UV-resistant PE sheaths allow outdoor and wall-mounted FTTH cable routing.

Advantages in FTTH Network Deployment

FTTH Butterfly Optic Cables provide a balance between durability and ease of installation. Their flat geometry prevents rolling and twisting during deployment, which significantly reduces installation time and labor costs in fiber access projects.

• Space-saving design suitable for indoor fiber distribution boxes and wall-mounted routing
• Improved bending performance for tight turns in apartments and office buildings
• High tensile strength for aerial FTTH drop cable installations

Typical Application Scenarios

These cables are widely deployed in last-mile fiber optic solutions where reliability and neat appearance are required. Common scenarios include residential FTTH access, commercial building fiber distribution, and campus network expansions.

Installation Best Practices

Proper installation is essential to maintain optical performance and mechanical integrity. Installers should follow recommended bend radius guidelines and avoid excessive pulling forces during deployment.

• Use appropriate fiber clamps for flat drop cable profiles
• Maintain minimum bend radius, especially near terminals and ONT locations
• Secure cables evenly to prevent localized stress points

Selecting the Right FTTH Butterfly Optic Cable

Choosing the correct cable specification depends on installation environment, distance, and regulatory requirements. Factors such as fiber type, jacket material, and strength member composition directly affect long-term network performance.

For indoor-only projects, LSZH flat fiber drop cables are recommended. Mixed indoor-outdoor deployments benefit from UV-resistant jackets and enhanced tensile designs. Understanding these parameters ensures compatibility with existing FTTH infrastructure and reduces maintenance costs.

Future Trends in FTTH Butterfly Optic Cables

As gigabit broadband and smart home adoption continue to grow, FTTH Butterfly Optic Cables are evolving to support higher fiber counts, improved bend resistance, and faster installation techniques. Manufacturers are also focusing on eco-friendly materials and pre-terminated solutions to further simplify deployment.

These developments position butterfly optic cables as a long-term solution for scalable fiber access networks, supporting increasing bandwidth demands while maintaining cost efficiency.