Question

The LEDs used in early optical communication systems had a spectral width ∆λ0 of about 20 nm around λ0 = 825 nm. Find τm if Dm = 84.2 (ps/km-nm) and given length of fiber is 2Km.

Answer 1

The material dispersion is given by
τ_m=D_m×L×∆λ (1)
Of (1) τm=3368 ps.