Calculate the V number of an optical fibre having numerical aperture 0.25

by Doubtly (98.9k points) in Engineering Physics 2 asked Apr 27, 2023 377 views

by Doubtly retagged Nov 4, 2023

Calculate the V number of an optical fibre having numerical aperture 0.25 and core diameter 20 μm, if its operating wavelength is 1.55 μm

1 Answer

by Doubtly (98.9k points) answered Apr 27, 2023

by Doubtly selected Jun 29, 2023

NA = 0.25
Core diameter = 20 μm
λ0= 1.55 μm

Formula: V = ᴨd / λ0 ×NA

V = 3.14×20×10^-6 /1.55 ×10^-6 ×0.25
V = 10.13

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