Fiber Optic Transmission Lines → FOTL - Tutorial 001. The optical fiber - operating principle
The optical fiber is a thin glass strand bilayer, each element (core and shell) has a different refractive index. The refractive index n of transparent material is the ratio of the velocity of light in vacuo (c - velocity of light) to the speed of light in this material (v), and defined by the following formula:
where ε and μ — respectively, relative dielectric and magnetic permeabilities.
Given that the relative magnetic permeability of the transparent material is usually constant and equal to one, the refractive index of the core for n 1 = √ε 1 , and for the shell n 2 = √ε 2 .
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