What is the material of OPGW optical cable

OPGW cables are composed of optical fibers housed in a stainless steel tube, surrounded by layers of aluminum and steel wires for mechanical strength and electrical grounding.

Core Optical Fiber Unit

The central part of an OPGW cable contains one or more optical fibers enclosed in a stainless steel tube. This tube protects the fibers from mechanical stress, moisture, and temperature variations, ensuring reliable high-speed data transmission over long distances . In some designs, the tube may also include water-blocking gel to prevent moisture ingress .

Metallic Armor Layers

Surrounding the central fiber tube are layers of metallic wires, which provide both mechanical strength and electrical conductivity. These layers typically include:

• Aluminum-clad steel wires: These trapezoidally shaped wires combine the tensile strength of steel with the corrosion resistance and conductivity of aluminum .
• Aluminum wires: Additional layers of pure aluminum may be used to enhance conductivity and reduce weight . The combination of steel and aluminum ensures that the cable can withstand mechanical stress, wind, ice loading, and lightning strikes, while also serving as a grounding conductor for the power line .

Construction Variants

OPGW cables can be constructed in different ways:

• Central loose tube type: Fibers are loosely placed in a sealed stainless steel tube, often with water-blocking gel, and protected by multiple layers of aluminum and steel wires .
• Aluminum layer over the tube: Some designs include an additional aluminum layer over the stainless steel tube for enhanced electrical performance .

Summary

In essence, the materials of an OPGW cable include:

• Optical fibers (glass) for data transmission
• Stainless steel tube for fiber protection
• Aluminum-clad steel wires for mechanical strength and grounding
• Aluminum wires for conductivity and corrosion resistance This combination allows OPGW cables to function simultaneously as a grounding wire for high-voltage power lines and a high-speed optical communication medium .