IGNOU PHE 16 2026 - With an appropriate diagram, explain the construction of graded index

Question

With an appropriate diagram, explain the construction of graded index multimode fibre. How does it reduce the modal dispersion?

28 Jan 2026

Answer :

Word Count : 277

A graded index multimode optical fibre consists of a cylindrical core surrounded by a cladding, where the refractive index of the core is not uniform but varies gradually with radial distance from the centre. The refractive index is maximum at the core axis and decreases continuously towards the core–cladding boundary, following an approximately parabolic profile. The cladding has a constant refractive index slightly lower than the minimum value of the core, ensuring total internal reflection. In an appropriate diagram, the fibre is shown with a central core, outer cladding, and a refractive index profile curve that slopes downward from the centre to the edge of the core. In

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