A laser diode is used to launch a pulse having wavelength lambda=1.1 micrometers and spectral width delta-lambda=500nm into a step-index fiber. The...

A laser diode is used to launch a pulse having wavelength lambda=1.1 micrometers and spectral width delta-lambda=500nm into a step-index fiber. The fiber has core diameter d=3.5 micrometers, length L=1km, and delta=0.005.a) Determine the number of modes that can propagate in the fiber.b) Determine the overall broadening of the pulse due to contributions from modal dispersion, material dispersion, and waveguide dispersion.