Fiber optic cable transmits signal

Fiber-optic cables transmit signals using pulses of light that travel through a glass or plastic core via total internal reflection.Fiber-optic communication works by converting data into light pulses, which are sent through a thin strand of glass or plastic called the core. The core is surrounded by a layer called the cladding, which has a lower refractive index. This difference in refractive index causes the light to reflect entirely within the core, a phenomenon known as total internal reflection, allowing the light to travel long distances with minimal loss of signal . The basic structure of a fiber-optic cable includes:Core: The central part where light travels, typically made of ultra-pure glass or plastic .Cladding: Surrounds the core and reflects light back into it, maintaining signal integrity .Buffer and Strengthener: Protective layers that cushion the fiber and provide mechanical strength .Outer Jacket: Shields the cable from environmental damage . There are two main types of fiber-optic cables:Single-mode fiber (SMF): Has a very small core and transmits light in a single path, ideal for long-distance communication .Multi-mode fiber (MMF): Has a larger core and allows multiple light paths, suitable for shorter distances and local networks . Fiber-optic cables are preferred over copper cables because they offer higher bandwidth, longer transmission distances, and immunity to electromagnetic interference. They are widely used in internet backbones, telephone networks, cable television, and medical imaging devices . In summary, fiber-optic cables transmit signals by modulating light pulses, guiding them through the core via total internal reflection, and converting them back into electrical signals at the receiving end, enabling fast, reliable, and high-capacity data transmission .