Fiber Optic Cable Materials In Manufacturing

Fiber Optic Cable Materials In Manufacturing

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Optical fiber drawing in drawing tower

Optical Fiber

CST fiber with reinforced FRP CSM strength member 144 core



steel wire armor fiber


12 core light armored figure 8 fiber cable


Fiber optic cable product finish and packing with drum


What Are Fiber Optic Cables Made of?

Based on how the fiber optic cables are constructed and how its been produced, fiber optic cable materials can be divided into following 6 elements from inside out. Check each for more details.

Fiber Optic Cable Basics

Fiber optic cable is made of a certain kind of optical fiber, to realize the optical communications between points.

And we all know that a single optical fiber is just as thin as a human hair, so it’s quite fragile. Therefore, all sort of fiber optic cable materials are applied during its manufacturing to get a proper cable construction and several protection measures.

FTTH drop cable with self-supporting wire

Fiber Optic Cable Materials

Optical Fiber

The optical fiber is the transmit medium in all fiber optic cables. It is the primary element for a fiber cable. According its different specifications and how the optical fiber is produced, we can see a large variety of optical fiber, such as SM, MM.

multi purpose breakout fiber optic cable
  • Single Mode, Multimode
  • Tight buffer fiber
  • G.657
  • Air blown fiber …

Central Strength Member (CSM)

When the fiber optic cable is constructed in multi loose tube or has large fiber count, there is a CSM (central strength member) put in the center of the cable. All loose tube with optical fiber will stranding along with the CSM.

  • Steel Wire
  • FRP with Sheath

Fiber Cable Reinforcement

To ensure the mechanical and optical performance of a fiber cable in strict or harsh environment, one layer of several layers of reinforcement materials will be needed during production.

Basic protection is a steel or aluminum armoring, steel wire armoring and aramid yarn protection are common protective materials.

  • Steel Tape
  • Aluminum Tape
  • Steel Wire
  • Aramid Yarn
  • Double Sheath

Water-blocking Materials

It is quite necessary to protect fiber cable from water damage in operations, for all underwater fiber cables and other fiber cables outdoors or in humid environment. There are mainly 3 different water-blocking materials are used in fiber optic cable.

  • Water-blocking Tape
  • Water-blocking Yarn
  • Fiber Cable Filling Compound

Supporting Materials

Most of fiber optic cables are installed in ducts, underground, or hanging with an extra messenger wire. There are also fiber optic cables that can be hang on its own, and this is a supporting wire besides the cable.

Other materials such as loose tube and rip cord are also indispensable for a fully constructed fiber optic cable.

  • Supporting Wire
  • Loose Tube
  • Rip Cord


Fiber cable sheath or jacket is the outside of all fiber optic cable materials, it directly contact with the external environment. So the material of the fiber optic cable outer sheath must be able to withstand the sun and rain, and not crack due to ultraviolet radiation.

At the same time, it must have certain tensile and flexural capabilities, and can withstand the abrasion during construction and the chemical corrosion in the use engineering.

fiber cable outer sheath materials
  • PVC
  • LSZH
  • AT

  • Anti-rodent

  • Anti-flame

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