Determine the core radius of a multi-mode, Mechanical Engineering

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Modal Dispersion in Step-Index Fibers

Determine the core radius of a multi-mode step index fiber with a numerical aperture NA = 0.1 if the number of modes M = 5000 when the wavelength is 870nm. If the core refractive index n₁ = 1.445, the group index N₁ = 1.456, and Δ is approximately independent of wavelength, determine the modal-dispersion response time σ_T for a 2-km-Iong fiber.

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