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Optical cables contain many steel wires

Optical network knowledge brief Published 28 Feb 2023

Prepared for preliminary research by the COETZER OPTICAL knowledge desk. Confirm compatibility, loss budgets and installation requirements against current standards and product documentation.

Steel wires in optical cables serve as strength members and protective elements, supporting the fibers and ensuring durability under mechanical and environmental stress.Purpose of Steel Wires

Steel wires in optical cables are primarily used to provide mechanical strength and structural support. Optical fibers themselves are fragile and cannot withstand tension, bending, or environmental forces such as wind, ice, or accidental pulling. Steel components, such as messenger strands and lashing wires, carry the mechanical load, allowing the cable to maintain integrity while protecting the delicate fibers inside .

Types of Steel Components
  1. Messenger Strand: A stranded steel cable, often made of carbon steel with a zinc or zinc-aluminum coating, that supports the weight of aerial fiber cables. It typically consists of six wires wrapped around a central wire and is designed to resist corrosion and mechanical stress .
  2. Lashing Wire: Stainless steel wires, usually 0.038" to 0.045" in diameter, are used to bind the optical fibers to the messenger strand. These wires are annealed for ductility and selected for strength and corrosion resistance depending on the installation environment .
  3. Armoring in OPGW (Optical Ground Wire): In high-voltage overhead transmission lines, optical fibers are placed inside stainless steel tubes and stranded alongside aluminum-clad steel or aluminum alloy wires. This design allows the cable to function both as a grounding conductor and a telecommunication medium, while withstanding environmental stresses like wind, ice, and electrical faults .
Benefits of Steel in Optical Cables
  • Mechanical Protection: Prevents fiber breakage during installation and operation.
  • Tensile Strength: Supports long spans in aerial installations without sagging.
  • Corrosion Resistance: Zinc or zinc-aluminum coatings and stainless steel grades ensure longevity in outdoor environments .
  • Dual Functionality: In OPGW, steel wires allow the cable to serve as both a structural and electrical grounding element while carrying optical fibers .
Summary

While optical fibers transmit data, steel wires provide the necessary strength, durability, and environmental protection. Their inclusion is essential in aerial, armored, and high-fiber-count cables, ensuring that the fibers remain intact and functional over decades of service .

Optical cables contain many steel wires - COETZER OPTICAL SYSTEMS (Pty) Ltd [PDF]

Optical cables contain many steel wires

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OverviewHistoryConstructionComparison with other methodsApplicationInstallationExternal links

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