// optical fibers and fiber optic communication system
 //Example 8.4
//OS=Windows 10
// // Scilab version 5.5.2(32 b i t )
clc ;
clear 
//given
N=6.5//material dispersion in ps/(nm*km)
deltalamda=6//spectral width in nm
L=25//length in km
//to find
tau=N*deltalamda*L//chromatic material dispersion
mprintf("chromatic material dispersion=%.3fns",tau*1e-3)
//the unit in textbook is wrong