Question: Multimode optical fiber has an optimum near parabolic graded-index profile. The source used is an LED having a spectral width of 25nm. The material dispersion

    Multimode optical fiber has an optimum near parabolic graded-index profile. The source used is an LED having a spectral width of 25nm. The material dispersion parameter is 30 /( . ) ps km nm. The pulse spread due to waveguide dispersion in this fiber is much smaller than the pulse spread due to material dispersion. The optical fiber has a numerical aperture of 0.40 and a core axis refractive index of 1.48.

    a. Estimate the total pulse spread per kilometer within the fiber.

    b. Estimate the bandwidth-length product of the fiber.

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