Transmission of data through optical fibre cables has brought in sea change in communication area. What is used as the carrier of information in this mode of communication?

Optical fiber cables use light (typically from lasers or LEDs) as the carrier of information, transmitted through glass or plastic fibers by total internal reflection. Light signals travel at near-light speed through these fibers, enabling enormous bandwidth over long distances with minimal signal loss. This technology revolutionized telecommunications, enabling high-speed internet, cable TV, and global communications infrastructure.