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Homework Help: Refractive Index of Optical Fibre Core and Cladding

  1. Sep 28, 2012 #1
    1. The problem statement, all variables and given/known data

    I need to find the refractive indexes of the core and cladding of an optical fibre by using the specs found here http://www.photonics.byu.edu/FiberOpticConnectors.parts/images/smf28.pdf Then I'm suppose to calculate the Numerical aperture and compare it with the one listed.

    2. Relevant equations

    None that I'm aware of

    3. The attempt at a solution

    I have tried reading the specs but can't seem to find any that would help me solve the index of refraction. Does anyone have an idea?
    Last edited: Sep 28, 2012
  2. jcsd
  3. Sep 28, 2012 #2


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    Staff: Mentor

    Is Effective Group Index of Refraction no help? (I know nothing about fibre optics, so am guessing.)
  4. Sep 29, 2012 #3


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    Homework Helper

    I do not think so. The effective index of refraction is connected to the speed of propagation of the optical signal along the cable, which depends on the refractive index of cable and cladding, but also on the geometry and structure of the cable. The effective refractive index is important for the user, the detail of the built-up is the secret of the manufacturer. :smile:

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