Refractive Index of Optical Fibre Core and Cladding

AI Thread Summary
The discussion focuses on determining the refractive indexes of the core and cladding of an optical fiber using provided specifications. The user struggles to find relevant information in the specs and questions the usefulness of the Effective Group Index of Refraction. It is clarified that the effective index relates to the signal's propagation speed, influenced by both the refractive index and the fiber's geometry. The importance of the effective refractive index for users is noted, while the specific details remain proprietary to manufacturers. Understanding these concepts is essential for accurate calculations in fiber optics.
~Sam~
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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?
 
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Is Effective Group Index of Refraction no help? (I know nothing about fibre optics, so am guessing.)
 
NascentOxygen said:
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. :smile:

ehild
 
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