#### Question

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.

#### Solution

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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#### APPEARS IN

Solution 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. Concept: Total Internal Reflection.