What type of signal does fiber optic cable transmit?

Fiber optic cable transmits data using light signals. This technology utilizes the principle of total internal reflection, whereby light is guided through the core of the optical fiber. The core is surrounded by a cladding layer that has a lower refractive index, allowing the light to be confined within the core as it travels along the fiber.

Using light for data transmission has several advantages over traditional electrical signals used in copper cables, including higher bandwidth capabilities, reduced signal degradation over long distances, and immunity to electromagnetic interference. These characteristics make fiber optics an ideal choice for high-speed data communications in various applications, ranging from telecommunications to internet infrastructure.

In contrast, electrical signals are typically transmitted over copper cabling, which is susceptible to interference and attenuation over long distances. Similarly, radio signals are used in wireless communications, and magnetic signals are not applicable in the context of fiber optics. Thus, light signals are the correct answer as they represent the unique method by which fiber optic cables operate.