Steel wire armored fiber optic cables are designed to provide robust mechanical protection for optical fibers, making them ideal for underground, outdoor, and high-stress installations.

Structure and Components

Steel wire armored (SWA) fiber optic cables consist of several layers to ensure durability and performance:

• Optical fibers: Single-mode or multi-mode fibers are housed in a loose tube filled with water-blocking gel or compound to prevent moisture ingress .
• Inner sheath: Protects the fibers and loose tubes.
• Steel wire armor: Multiple steel wires are helically wound around the cable or placed in parallel to provide crush resistance, tensile strength, and protection against impacts or rodent attacks .
• Outer jacket: Made of PE or LSOH material, providing environmental protection and UV resistance . Some designs also include corrugated steel tape or interlock/spiral steel armor for additional flexibility and mechanical protection .

Types of Steel Wire Armoring

• Helical steel wire armor: Wires wound around the cable for excellent crush resistance, commonly used in underground installations .
• Parallel steel wires: Two or more wires placed alongside the cable for tensile strength and support in aerial or duct applications .
• Interlock or spiral steel armor: Provides flexibility and protection against rodent damage and mechanical stress .

Applications

SWA fiber optic cables are widely used in environments where mechanical stress, moisture, or rodent damage is a concern:

• Underground installations: Direct burial in soil, resisting pressure, moisture, and soil acidity .
• Outdoor networks: Fiber optic backbones, FTTH, and industrial automation systems .
• Industrial environments: Data centers, LAN systems, and areas with high mechanical stress .

Advantages

• High mechanical protection: Resistant to crushing, impact, and rodent attacks .
• Durability: Suitable for long-term outdoor and underground use.
• Versatility: Compatible with single-mode and multi-mode fibers for various distances and data rates .
• Water and environmental resistance: Water-blocking compounds and robust outer jackets prevent moisture ingress and environmental damage . Steel wire armored fiber optic cables are essential for reliable, high-speed data transmission in harsh environments, combining the performance of optical fibers with the mechanical strength of steel.