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What is aN OPTICAL FIBER?
An optical fiber is a flexible, transparent strand made of high-purity silica glass or plastic, engineered to transmit light signals over long distances with minimal signal loss. Operating as a highly efficient waveguide, its primary purpose is to carry data, telecommunications traffic, or laser light by confining electromagnetic waves within its core.
Because optical fibers transmit information using photons rather than electrons, they offer immense bandwidth, exceptional speed, and complete immunity to electromagnetic interference (EMI) compared to traditional copper wiring.
HOW aN OPTICAL FIBER Works
The mechanism of an optical fiber depends on precise material layering and a foundational principle of optics, functioning in three stages:
Light Injection
A light source, such as a laser diode or an LED, injects encoded optical signals into the core of the fiber. The core is the innermost region of the strand, specifically designed with a high refractive index.
Total Internal Reflection
Surrounding the core is a layer called the cladding, which has a slightly lower refractive index. When light strikes the boundary between the core and the cladding at a shallow angle, it is not refracted outward; instead, it undergoes total internal reflection, reflecting entirely back into the core.
Continuous Propagation
This reflection repeats continuously down the length of the strand, zigzagging the light safely through bends and turns until the optical signal reaches the receiver at the opposite end without escaping through the sides.
