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The glass fibers that are used for optical transmission of information are chemically doped so that...

The glass fibers that are used for optical transmission of information are chemically doped so that the index of refraction varies from the center to the outside of the cross-section. Why?

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The purpose of glass fiber is transmission and for maximum transfer of signal,there should be least loss of the signal...

So, glass fiber are doped such that refractive index of the fiber at the centre should be greater than that at the outside of the cross section....The refractive index should be such that it has lower critical angle such that the signal whose angle of incidence is greater than that of critical angle suffers total internal reflection. This phenomenon will result in transmission of signal with very less loss....

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