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In which of the following there is no distortion?

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in Engineering Physics II by (679k points)
In which of the following there is no distortion?

(a) Graded index fibre

(b) Multimode step-index fibre

(c) Single step-index fibre

(d) Glass fibre

This question was posed to me during an internship interview.

The doubt is from Optical Fibre topic in division Laser of Engineering Physics II

1 Answer

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Right answer is (a) Graded index fibre

To elaborate: The light travels with different speeds in different paths because of the variation in their refractive indices. At the outer edge it travels faster than near the centre But almost all the rays reach the exit end at the same time due to the helical path. Thus, there is no dispersion in the pulses and hence the output is not a distorted output.

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