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What is the principle of fibre optical communication?

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What is the principle of fibre optical communication?

(a) Frequency modulation

(b) Population inversion

(c) Total internal reflection

(d) Doppler Effect

This question was addressed to me by my college director while I was bunking the class.

My question comes from Optical Fibre in chapter Laser of Engineering Physics II

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Right choice is (c) Total internal reflection

The explanation is: In optical fibres, the light entering the fibre does not encounter any new surfaces, but repeatedly they hit the same surface. The reason for confining the light beam inside the fibres is the total internal reflection.

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