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Optical Cable Blowing and Laying Technology

Fiber and communications infrastructure knowledge brief Published 29 Sep 2023

Prepared for preliminary research by the ROGER FIBRE knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Optical fiber cables can be installed using blowing (air-assisted) or pulling methods, with blowing being preferred for long ducts and complex routes due to reduced friction and faster installation. Blowing (Air-Assisted) InstallationBlowing, also called fiber jetting, involves pushing the cable into a pre-installed duct using a combination of mechanical force and high-speed airflow. The process begins by feeding several hundred meters of cable into the duct using a tractor mechanism with traction rollers.

Compressed air is then injected at the duct inlet, creating a floating effect that reduces friction between the cable and duct walls, allowing the cable to travel longer distances efficiently. Key points for blowing installation: Cable selection: Use cables with low friction outer jackets; stiffer cables are better for straight ducts, while flexible cables handle multiple bends more effectively. Blowing head: The cable is attached to a blowing head with seals that grip it tightly.

In some methods, a piston or “bullet” is attached to the cable end to improve pulling force distribution. Air pressure: Use the minimum required pressure to avoid damaging the cable. Temperature control is important, as cold cables or air can make the jacket brittle.

Distance: Microduct cables can be blown over 1000 meters in favorable conditions, and longer runs can be achieved using mid-assist devices along the route. Crash testing: Before full installation, a short duct section is used to determine the maximum pushing force to prevent cable buckling or sheath damage. Pulling (Laying) InstallationPulling is the traditional method where the cable is manually or mechanically pulled through the duct.

It is generally used for shorter distances or when blowing equipment is unavailable. Key considerations include: Hydraulic or manual pulling: Machine pulling requires a hydraulic power pack, while manual pulling is labor-intensive. Friction management: Lubricants may be applied to reduce friction, especially in ducts with multiple bends.

Fill ratio: The ratio of cable diameter to duct diameter should be optimized (typically 50–80%) to prevent excessive tension and buckling.

Comparison and Best Practices

Blowing vs Pulling: Blowing reduces labor, installation time, and friction, making it ideal for long ducts with bends. Pulling is simpler but less efficient for long or complex routes. Equipment: Modern fiber blowing machines include cable drive systems, air control systems, duct clamps, and real-time speed and pressure controls.

Environmental factors: Inspect ducts for debris and moisture, and ensure proper temperature conditions to prevent cable damage. Safety: Always monitor pushing force and air pressure to avoid cable damage, and follow manufacturer guidelines for equipment operation. By following these methods and best practices, optical fiber cables can be installed efficiently, safely, and over long distances with minimal friction and reduced labor costs.

Optical Cable Blowing and Laying Technology - ROGER FIBRE ATELIER [PDF]

Optical Cable Blowing and Laying Technology

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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