Q1: A multimode step index fiber has a relative refractive index difference of 1% and a core refractive index of 1.46. The maximum optical bandwidth that may be obtained with a particular source on a 4.5 km link is 3.1 MHz. (a) Determine the rms pulse broadening per kilometer resulting from chromatic dispersion mechanisms. (b) Assuming waveguide dispersion may be ignored, estimate the rms spectral width of the source used, if the material dispersion parameter for the fiber at the operating wavelength is 90 ps nm1 km1.

Q2:An 8 km optical fiber link without repeaters uses multimode graded index fiber which has a bandwidthlength product of 400 MHz km. Estimate: (a) the total pulse broadening on the link; (b) the rms pulse broadening on the link. It may be assumed that a return to zero code is used.