Refractive Index of Optical Fibre Core and Cladding

[~Sam~]

Homework Statement

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.

Homework Equations

None that I'm aware of

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?

 

[NascentOxygen]

Is Effective Group Index of Refraction no help? (I know nothing about fibre optics, so am guessing.)

 

[ehild]

Is Effective Group Index of Refraction no help? (I know nothing about fibre optics, so am guessing.)

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.

ehild