Question

Explain what is meant by a graded index optical fiber, giving an expression for the possible refractive index profile. Using simple ray theory concepts, discuss the transmission of light through the fiber. Indicate the major advantage of this type of fiber with regard to multimode propagation.

Answer 1

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graded index optical fiber

$\bull$ Graded Index fiber is another type of optical fiber in which

$\bull$ the refractive index of the core is non-uniform.

$\bull$ This non-uniformity is present because the refractive index is

higher at the axis of the core and continuously reduces with the radial movement away from the axis.

$\bull$ the refractive index of the cladding is constant in the case of graded index fiber. 

Advantages

$\bull$ It can transmit a large amount of information.

$\bull$ The distortion is comparatively small than step index fiber.

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Diagrams