Which statement about fibre optic telecommunications is incorrect?

Which statement about fibre optic telecommunications is incorrect?

• A. Analog signal is converted into digital signal
• B. Laser turns on and off billions of times per second
• C. Signals travel through copper wires
• D. Light carries information through optical fibers

Answer: (C)

In fibre optic telecommunications, information travels as light inside a glass or plastic fiber, not as electrical signals in copper wires. The transmitter takes the electrical input and converts it to light, usually with a laser or LED, and this light is then modulated rapidly to carry data—billions of times per second. The light remains guided along the fiber by total internal reflection, reaching a receiver that converts it back into an electrical signal. The idea that signals move through copper wires doesn’t fit fibre optics because copper handles electrical signals, while fibre carries information through light. The other statements align with how fibre optic links work: converting to light, using a laser that switches on and off very quickly, and the fundamental role of light carrying information through the fiber.

In fibre optic telecommunications, information travels as light inside a glass or plastic fiber, not as electrical signals in copper wires. The transmitter takes the electrical input and converts it to light, usually with a laser or LED, and this light is then modulated rapidly to carry data—billions of times per second. The light remains guided along the fiber by total internal reflection, reaching a receiver that converts it back into an electrical signal. The idea that signals move through copper wires doesn’t fit fibre optics because copper handles electrical signals, while fibre carries information through light. The other statements align with how fibre optic links work: converting to light, using a laser that switches on and off very quickly, and the fundamental role of light carrying information through the fiber.