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+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar
+//Example 3.2
+//OS=Windows 10
+////Scilab version Scilab 6.0.0-beta-2(64 bit)
+clc;
+clear;
+
+//given
+n1=1.46;//refractive inde for the silica
+p=0.286;//photo elastic coefficient for the silica
+Bc=7e-11;//isothermal compressibility in m^2/N
+lambda=1e-6;//wavelength in meters
+KB=1.38e-23;//Boltzman constant in J/K
+TF=1400//fictive temperature in K
+u=8*(%pi^3)*KB*Bc*TF*p^2;// partial product
+v=(n1)^8;//partial product
+z=(lambda)^4;//partial product
+taur=[(u*v)/(z*3)];//Rayleigh scattering coefficient in per Km
+mprintf("\n Rayleigh scattering coefficient=%.3f*10^-4 per meter",taur*10^4);//multiplication by 1e4 to convert the unit to !0^-4 per Km
+LKM=exp(-taur*1e3);//transmission loss factor of fiber per m
+AdB=10*log10(1/LKM);//Attenuation in dB
+mprintf("\n Attenuation in dB=%.2fdB per Km",AdB);
+//the answer vary due to rounding