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Numerical

The core diameter of multimode step index fibre is 50 μm.The numerical aperture is 0.25. Calculate the number of guided modes at an operating wavelength of 0.75 μm.

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#### Solution

d = 50 x 10^{-6} m

N.A = 0.25

λ = 0.75 x 10^{-6} m

`V = (πd)/λ x N.A`

`= (π x 50 x 10^(−6))/(0.75 x 10^( −6) `

= 52.36

`Nm = (V^2)/2`

= 1370.8

= 1370

Number of modes = 1370 |

Concept: Numerical Aperture

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