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Engineering Physics by S. Mani Naidu

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Solved Problems

1.    The refractive indices of core and cladding materials of a step index fibre are 1.48 and 1.45, respectively. Calculate: (i) numerical aperture, (ii) acceptance angle, and (iii) the critical angle at the core-cladding interface and (iv) fractional refractive indices change.

 

(Set-1–May 2006)

Sol: Let the refractive index of core, n1 = 1.48

and the refractive index of cladding , n2 = 1.45

  1. Numerical aperture (NA) images

                    images

  2. Let θ0 be the acceptance angle
  3. n2 sin 90 = n1 sin θc [θc = critical angle]
  4. The fractional refractive ...

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