Industrial optical communication solutions from TOMOR
Custom networking and fiber solutions for industry

Laying optical cables inside silicon core tubes

Laying optical cables inside silicon core tubes

Silicon core tubes provide low-friction, durable conduits for optical cables, enabling efficient installation and repeated cable extraction without damage.Composition and StructureSilicon core tubes are typically made with a high-density polyethylene (HDPE) outer and middle layer and a silicone-based inner layer that acts as a solid lubricant . The inner silicone layer significantly reduces friction, allowing optical cables to be pulled or blown through long distances with minimal resistance. The preferred material composition includes HDPE (95–100%), silicone (2.5–3.5%), active silicone oil (5–8%), dimethyl silicone oil (6–10%), initiating agents (0.5–1.5%), and antioxidants (1.5–2.5%), . This combination ensures heat resistance, durability, and repeated cable extraction capability.Manufacturing ProcessThe tubes are produced using a three-layer co-extrusion process, where HDPE and silicone are heated and extruded simultaneously through independent extruders . A precise metering system ensures uniform layer thickness and adhesion, preventing peeling or uneven lubrication. The silicone layer forms a permanent, low-friction inner surface that remains effective throughout the tube's lifespan.Advantages for Cable LayingLow Friction: The silicone inner layer has a friction coefficient as low as 0.142, reducing labor intensity and allowing cables to be pulled or blown efficiently .Durability: The HDPE outer layers provide mechanical strength, weather resistance, and pressure resistance, protecting the cable from external damage .Reusability: Cables can be repeatedly extracted and reinserted without damaging the tube or the cable .Ease of Installation: Tubes can rotate within the outer casing, simplifying cable insertion and reducing construction time and costs .Installation MethodsSilicon core tubes are commonly used in pipeline (underground) installations. Optical cables can be laid using air-blown techniques, where compressed air suspends the cable inside the tube, allowing it to travel long distances efficiently . Tubes are often installed in urban pipelines, long-distance wild pipelines, or microduct systems along highways and railways. Typical tube diameters range from 32mm to 40mm, with section lengths around 980 meters for long-distance pipelines .Practical ConsiderationsEnsure proper alignment and minimal bends to maintain low friction.Use compatible cable blowing machines to optimize air flow and cable transport.Regular inspection of tube integrity is recommended to prevent blockages or damage during repeated cable insertions. Silicon core tubes represent a modern, efficient solution for optical cable deployment, combining material science and engineering precision to improve installation speed, reduce labor, and extend the operational life of optical networks .

Installing fiber-optic cable in premises applications

Although it is not a fragile medium, optical-fiber cable must be carefully and expertly installed to realize its full potential.

Underground Installation of Optic Fiber Cable Placing

Placing cables underground has the added benefits of reducing transmission losses, aiding planning consent and reduced risk of service supply loss through extreme weather. This practice covers the

Silicon core tube for optical cable

The silicon core tube for the optical cable comprises an outer tube, a mixed support, a movable support, a middle layer and a silicon core tube body, wherein the fixed support is...

Silicon-Core Optical Fiber Technologies

Silicon-core optical fibres represent a convergence of semiconductor photonics and conventional fibre technology, embedding a crystalline silicon or silicon–germanium alloy core within a...

Submarine communications cable

7 – Petroleum jelly 8 – Optical fibers Submarine cables are laid using special cable layer ships, such as the modern René Descartes , operated by Orange

Undersea Fiber Optic Cables: Everything You Need to Know

The laying of undersea fiber optic cables is a highly skilled operation that involves meticulous planning, precise execution, and specialized equipment. By following careful procedures, adhering to industry

Submarine communications cable

A cross section of the shore-end of a modern submarine communications cable. 1 – Polyethylene 2 – Mylar tape 3 – Stranded steel wires 4 – Aluminium water barrier

Handbook Optical fibres, cables and systems

Both core and cladding use silica as the basic material, the difference in the refractive indexes is realized by doping the core or the cladding or both. Dopants such as GeO2 and P2O5 increase the refractive

Complete Guide to Fiber Optic Cable Construction

This guide explains fiber optic cable construction, the difference between tight buffer and loose tube structures, and compares eight common cable types used in data

Cable Core

Cable Core The optical fibers with the secondary coating (tight or loose) are rejoined together in a cable core. For tight fibers or loose tubes, the cable core is obtained by stranding the fibers or the tubes

Outdoor Fiber Installation Practices Explained for 2025

Select armored, waterproof fiber optic cable with pressure-resistant coatings and gel-filled tubes. Use cable-laying vessels or remotely operated

Study on the optimal structure of nonmetallic coiled tubing with cable

Consequently, the design incorporating embedded optical fibers within the reinforcement layer represents the most optimal structure for cable installation. Utilizing this optimal structure, the

Semiconductor core fibres: materials science in a bottle

In this Review, the authors discuss the materials science behind producing crystalline core fibers for diverse applications and progress in the field.

Fiber laying scheme

Optical fiber laying methods and requirements Conventional outdoor optical fibers use loose tubes as the core container, which is the most common

Silicon core fibers—From fabrication to applications

Silicon core fibers (SCFs), which comprise a silicon core in the form of a glass-clad optical fiber, represent a marriage of fiber optics and silicon

The FOA Reference For Fiber Optics

The fiber optic contractor should be able to work with the customer in each installation project through six stages: design, installation, testing,

Recent advances in silicon core optical fibers: from fabrication to

The fabrication and optimization of the unique silicon core fiber platform has been reviewed. Thanks to several recent advancements, the fibers are showing great potential for use in wide ranging

Standard for Installing and Testing Fiber Optics

Although most fiber optic cables are not conductive, any metallic hardware used in fiber optic cabling systems (such as wall-mounted termination boxes, racks, and patch panels) must be grounded.

The Role of Silicon Core Tubes in Communication Optical Cables

By leveraging the benefits of silicon core tubes, you can enhance the reliability and performance of your communication systems, ensuring smooth and uninterrupted operations.

Application of HDPE silicon core tube in optical cable communication line

From a global perspective, many developed countries have adopted HDPE silicon core tubes as trunk protection pipelines in the laying of optical cable communication lines.

How to Lay New Optical Cables in Underground Pipeline?

How to use limited underground pipeline resources to lay new optical cables is one of the backbone network construction problems faced by network

Pulling and blowing a cable in a duct

So, it is not a surprise that the optical fibre cables, originally for pulling in duct, were mechanically reinforced and were taking also advantage of the loose tube design offering a significant fibre

ITU-T Rec. L.77 (05/2008) Installation of optical fibre cables inside

Summary ITU-T Recommendation L.77 describes methods to install optical cables inside sewer ducts, which applies to both the cable installation and the pre-installation of an infrastructure, if requested.

Basic Components of a Fiber Optic Cable

This article examines the key components that make up a fiber optic cable including the core, cladding, coating, strengthening fibers and cable jacket.

OPTICAL FIBRE CABLE JOINTING

The tubing cutter is then gently pulled to apply pressure to the buffer tube resulting in the sliding of the buffer tube off of the optical fibre. This example also shows that the optical cable is looped and held

Indoor and Outdoor Fiber Optic Cable Installation: Key

Choosing the right fiber optic cable and following proper installation techniques is essential for building a robust network. Whether installing indoor

Understanding of Cable in Duct Installation: Do ́s and Don ́ts

Abstract Installation of cables in ducts is a common practice today, for both telecommunications and energy transport, ranging from single optical fibres to energy cables of over 100 mm diameter

Silicon core fibers—From fabrication to applications

This tutorial reviews silicon core fibers: a platform that unites fiber optics and silicon photonics.

Fiber Optic Cable Guide: Fiber Optic Cable Types and

The core of optical fibers can be plastic (used for very short distances), but most are made from glass. And glass optical cables are made

SY/T 4108-2019: (Code for design and (PDF English)

SY/T 4108-2019: (Code for design and construction of laying optical cable (silicon core tube) in the same ditch of oil and gas pipeline) Delivery: In 9 working days.

How the Internet works: Submarine fiber, brains in jars,

How the Internet works: Submarine fiber, brains in jars, and coaxial cables A deep dive into Internet infrastructure, plus a rare visit to a subsea cable

More industry information

Contact Us

We Look Forward to Working with You

Contact Information

Phone +49 69 2381 5497
Address Am Hauptbahnhof 10, 60329 Frankfurt am Main, Germany

Send an Inquiry