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//Fiber-optics communication technology, by Djafer K. Mynbaev and Lowell L. Scheiner
//Example 6.3.1
//windows XP
//Scilab version-5.5.1
clc;
clear ;
//given
L=100E12;//Length of the single-mode fiber link in nm
lambda0=1310;//average of zero-dispersion wavelength in nm
lambda=1550;//operating wavelength in nm
S0=0.092;//zero dispersion slope in ps/nm^2
y=lambda0/lambda;
z=1-y^4;
Dlambda=(S0/4)*lambda*z;//dispersion coefficient in ps/nm.Km
deltalambda=1;//light source's spectral width in nm
deltatchrom=Dlambda*deltalambda*L;//Pulse spread caused by chromatic dispersion in s
mprintf("Pulse spread caused by chromatic dispersion = %.2f ps",deltatchrom*1E-12);//multiplication by 1e-12 to convert unit from s to ps
x=6.66;//here, x= L/Ldcf assumed to be 6.66
Ddcf=-Dlambda*x;//dispersion in DCF in ps/nm.Km
mprintf("\nWe need DCF of %.2f ps/nm.km to compensate for dispersion in a conventional SM fiber.",Ddcf);
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