Optical fiber cable is composed of gypsum components

Optical fiber cables are not composed of gypsum; they are primarily made of ultra-pure glass (silicon dioxide) or specialized plastics, along with protective coatings and strength members.

Core and Cladding

The core of an optical fiber, which carries light signals, is typically made of ultra-pure silica glass (SiO2), sometimes doped with materials like germanium to adjust the refractive index for optimal light transmission. Surrounding the core is the cladding, also made of glass but with a slightly lower refractive index, which ensures total internal reflection to keep light confined within the core.

Protective Coatings

Each fiber is coated with acrylate polymers or polyimide layers to protect against scratches, moisture, and mechanical stress. These coatings do not contribute to the optical properties but are essential for durability.

Strength Members and Jacket

Fiber optic cables include strength members such as aramid yarn (e.g., Kevlar) or glass rods to prevent stretching and mechanical damage. The outer cable jacket is made of plastic or other polymers, chosen based on environmental requirements like fire resistance, UV protection, or water resistance.

Additional Features

Some cables, especially outdoor or armored types, may include steel reinforcements, water-blocking gels, or ripcords for installation and protection. These materials are carefully selected for mechanical and environmental resilience, but gypsum is not used in any part of standard fiber optic cable construction. In summary, fiber optic cables rely on glass, plastics, polymers, and high-strength fibers, not gypsum, to achieve their optical performance and durability.