Principles of Optical Fiber Communication Refraction of Light
The principle of fiber optic operation is based on Snell's law, which describes the phenomenon of light refraction when passing through the boundary between two mediums with different refractive indices. An optical fiber can be understood as a dielectric waveguide, which operates at optical frequencies. The refractive index of a medium is defined as the ratio of the velocity of light in a vacuum to the velocit of light in the medium.
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