What is the refractive index for germanium doped multimode?

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No title

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Mostafa Agour

For the 50/125µm MM fiber: 1.480 @ 850 nm and 1.479 @ 1300 nm

Fir the 62.5/125µm MM fiber: 1.496 @ 850 nm and 1.491 @ 1300 nm

Faramarz E. Seraji

The refractive index of the core may vary in different productions. You need to know the numerical aperture (NA) of the fiber. Therefore, the relative refractive index between core and cladding is required to calculate the output NA. If you want to be accurate in your experiment, it is better ask the manufacturer of the fiber being used in your setup.