Identify Step Index/Graded Index Fibers

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vinodquilon

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How can I experimentally identify between SI/GI Fibers ?
 

i don't know what are the instruments you have. the mode dispersion measurement is the easiest way.

for step index
mode dispersion = (L n1 Δ )/c
for graded index fiber
mode dispersion = ((L n1 Δ² )/8c
where L=length of the fiber
n1=refractive index of the core
Δ= (n1-n2)/n1
c=speed of light
the change in measurement of mode dispersion gives nature of the fiber.


thankyou
 
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