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Material dispersion calculation (optical fiber)

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johnchau123

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Material dispersion in optical fiber is defined as D = (-λ/c)×(d²n/dλ²)
I was given a graph of λ²×(d²n/dλ²) against λ, refractive index of core of fiber, index difference and diameter of the core and cladding.

What I would like to ask is the stuff I have to find out is (-λ/c)×(d²n/dλ²) = (-1/cλ)× [λ²×(d²n/dλ²)]. Since I know λ²×(d²n/dλ²) from the graph and I know c and λ, then I could calculate the dispersion immediately.

Then, what is the use of the information provided, such as refractive index of core of fiber, index difference and diameter of the core and cladding??

Are they extra to this question or I skip something?

Thanks.

John
 

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