Answer to Question #99324 in Optics for Ra

Question

Please explain pulse dispersion in step-index fibre. If the core and cladding refractive indices for a step-index fibre are 1.47 and 1.46 respectively, calculate the broadening of a pulse after a distance of 5 km.

Answer 1

The pulse dispersion in step-index fibre is given by formula

$Δ=\frac {(n_1 – n_2)n_1l}{c} (1)$

where n₁ is the refractive index of core,

n₂ is is the refractive index of cladding,

l is the length of the optical fiber under observation,

c is the the speed of light in vacuum

Using (1) we got

Δ=2.45×10^-7 s

Answer

2.45×10^-7 s