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A Guide to the Material used in Fiber Optic Cable
Latest company news about A Guide to the Material used in Fiber Optic Cable

Fiber optic cables are made of several key materials, each serving a specific purpose to ensure efficient light transmission and durability.

1. Core (Light Transmission Path)
  • Material: Ultra-pure glass (silica, SiO₂) or sometimes plastic (for POF - Plastic Optical Fiber).
  • Function: Carries light signals (laser or LED) over long distances.
  • Purity: Glass cores are doped with germanium (GeO₂) or fluorine to adjust refractive index.
2. Cladding (Light Reflection Layer)
  • Material: Glass or plastic with a lower refractive index than the core.
  • Function: Keeps light signals contained within the core via total internal reflection.
3. Coating (Protective Layer)
  • Material: Acrylate (UV-cured resin) or polyimide (for harsh environments).
  • Function: Protects the fragile glass fiber from moisture and physical damage.
4. Strength Members (Reinforcement)
  • Material:
    • Aramid yarn (Kevlar®) - Provides flexibility and tensile strength.
    • Steel wire - Used in armored fiber cables for extra protection.
    • Fiberglass rods - Prevents bending and crushing.
  • Function: Protects the fiber from stretching and breaking during installation.
5. Buffer Tubes (For Multi-Fiber Cables)
  • Material: Plastic (PBT, PVC, or nylon).
  • Function: Houses multiple fibers in loose-tube designs, protecting them from moisture and stress.
6. Outer Jacket (Environmental Protection)
  • Material:
    • PVC (Polyvinyl Chloride) - General-purpose, flexible.
    • LSZH (Low Smoke Zero Halogen) - Used in buildings for fire safety.
    • PE (Polyethylene) - For outdoor/underground cables (resistant to water/UV).
    • Armored (Steel/Aluminum) - For rodent/mechanical protection.
  • Function: Shields the cable from water, chemicals, abrasion, and physical damage.
Special Cases:
  • Plastic Optical Fiber (POF):
    • Core: PMMA (Polymethyl methacrylate) or Polystyrene.
    • Used in short-range applications (car networks, home audio).
  • Fluoride/Chalcogenide Glass Fibers:
    • Used in infrared transmission (military, medical imaging).
Pub Time : 2025-06-24 10:49:45 >> News list
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