Belarus Air-blown Optical Cable Construction

Air-blown optical cables use compressed air to install microcables through pre-installed ducts, offering flexible, low-friction deployment and future network expansion. Cable StructureAir-blown optical fiber cables are designed to minimize friction and facilitate long-distance installation. A typical construction includes: Cable Core: The central element that may contain one or more optical fibers.

Loose Tube: Sleeves the cable core, allowing fibers to move freely and absorb stress. Strengthening Layer: Often mesh-shaped or made of aramid yarns, wrapped around the loose tube to provide tensile strength and prevent damage during blowing. Outer Jacket: Encases the strengthening layer and may include a drag reduction structure with alternating protrusions and recesses to reduce contact with microtubes, lowering surface friction and improving air-blown performance (EP 4194914 A1).

This design allows the cable to float inside microducts, reducing friction and enabling longer installation distances without fiber damage. Installation MethodAir-blown cable installation, also called blowing or jetting, involves: Pre-installed Microducts: Ducts are laid in the desired route before fiber installation. Compressed Air Injection: Air is blown through the duct, creating a low-friction environment that allows the cable to move easily.

Mechanical Pushing: A tractor or pushing device applies force near the cable inlet to assist movement. Floating Cable: The combination of air flow and pushing force keeps the cable suspended, minimizing contact with duct walls and reducing stress on fibers. Air-blown systems can install continuous cable lengths exceeding 1 km, depending on duct layout, cable stiffness, and bends.

Stiffer cables perform better in straight or undulating ducts, while flexible cables navigate complex routes more effectively.

Advantages

Future Expansion: Microcables can be added later without re-laying ducts, supporting scalable networks. Reduced Labor and Costs: Long cable lengths can be installed in a single operation, lowering installation time and material handling. Minimized Optical Loss: Fewer splices and interconnections improve signal quality.

Versatility: Suitable for indoor, outdoor, urban, and underground deployments. Components of an Air-Blown Fiber SystemMicroducts: Network of small ducts connecting distribution points. Blowing Apparatus: Generates air flow to pull microcables through ducts.

Optical Fiber Microcables: Lightweight, flexible cables designed for air-blown installation. Termination Cabinets and Hardware: Facilitate connections and branching at network nodes.

Application in Belarus

While specific Belarusian deployments are not detailed in the sources, the air-blown optical cable technology is globally applicable, including urban and rural networks in Belarus. It is particularly suitable for Fiber-to-the-Home (FTTx), underground networks, and areas requiring future network scalability. The system allows pre-installation of ducts, enabling flexible fiber deployment as demand grows.