Fiber optic cables do not carry electricity; they transmit data using light pulses instead of electrical signals.

Fiber optic cables are made of extremely pure glass or plastic fibers that transmit information as light pulses, typically generated by lasers or LEDs, rather than electrical current . The core of the fiber guides the light through total internal reflection, while the cladding and protective coatings ensure minimal signal loss and physical durability . This design allows fiber optics to transmit data over long distances at high speeds without the interference or signal degradation common in copper cables . Because fiber optics do not conduct electricity, they are immune to electromagnetic interference, do not emit sparks, and provide electrical isolation between connected devices . This makes them particularly safe for use in high-voltage environments, explosive atmospheres, or areas with sensitive electronic equipment . While the light signals themselves carry no electrical charge, the equipment at either end of the fiber—such as transmitters, receivers, and amplifiers—requires electricity to operate, but the cable itself remains non-conductive . In summary, fiber optic cables transmit data using light, not electricity, which provides advantages in speed, bandwidth, safety, and resistance to interference compared to traditional copper cables used in telecommunications and broadcasting .