Article Overview
A two-core dish-shaped optical cable is a dual-core fiber optic cable, often used in FTTH networks, with two parallel optical fibers embedded in a flat or figure-8 design for indoor and outdoor deployment.
Structure and Design
Two-core optical cables, also called dual-core fibers, contain two separate optical cores that can independently transmit light, allowing simultaneous data transmission over each core . In a dish-shaped or butterfly/figure-8 design, the two cores are embedded in a flat cable with parallel strength members (often FRP or metal rods) to provide mechanical support and prevent fiber damage during installation . The LSZH (Low Smoke Zero Halogen) sheath ensures safety in indoor environments, while outdoor-rated versions include UV-resistant jackets for environmental protection .
Applications
These cables are primarily used in FTTH (Fiber to the Home) networks, connecting the main feeder line to individual subscribers. They are suitable for both indoor cable trays and outdoor duct installations, providing a lightweight, compact solution for short-distance distribution . The dual-core design allows for redundancy or bidirectional communication in a single cable, improving network reliability.
Technical Features
- Fiber Type: Typically single-mode (OS2) with 9/125 µm core/cladding diameter .
- Standards: Compliant with G.657.A2 for bend-insensitive performance, suitable for tight bends in indoor installations .
- Strength Members: FRP or metal rods provide tensile strength and prevent fiber breakage during pulling .
- Testing: Optical Time Domain Reflectometer (OTDR) is used to verify fiber integrity, measure length, and detect faults .
Advantages
- Compact and lightweight, ideal for residential and small business deployments.
- Bend-insensitive fibers reduce signal loss in tight spaces.
- Dual-core design allows simultaneous or redundant connections.
- Suitable for both indoor and outdoor environments with proper jacket materials. In summary, a two-core dish-shaped optical cable is a versatile, dual-core fiber optic solution designed for efficient FTTH deployment, combining mechanical strength, environmental protection, and high-performance optical transmission.
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