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+//Example 3.2

+//Program to Determine Theoretical attenuation in dB/km due to fundamental rayleigh scattering at optical wavelengths:

+//(a)0.63um

+//(b)1.00um

+//(c)1.30um

+

+clear;

+clc ;

+close ;

+

+//Given data

+n=1.46;             //REFRACTIVE INDEX

+p=0.286;            //PHOTOELASTIC COEFFICIENT

+Bc=7*10^(-11);      //m^2/N - ISOTHERMAL COMPRESSIBILITY

+K=1.381*10^(-23);   //J/K - BOLTZMANN's CONSTANT

+Tf=1400;            //Kelvin - FICTIVE TEMPERATURE

+l=1000;             //metre - FIBER LENGTH

+

+//(a)Attenuation in dB/km due to fundamental rayleigh scattering at 0.63um

+lambda=0.63*10^(-6);             //metre - WAVELENGTH

+Gamma_R=8*(%pi)^3*n^8*p^2*Bc*K*Tf/(3*lambda^4);

+L_km1=exp(-Gamma_R*l)

+A1=10*log10(1/L_km1);

+

+//(b)Attenuation in dB/km due to fundamental rayleigh scattering at 1.00um

+lambda=1.00*10^(-6);             //metre - WAVELENGTH

+Gamma_R=8*(%pi)^3*n^8*p^2*Bc*K*Tf/(3*lambda^4);

+L_km2=exp(-Gamma_R*l)

+A2=10*log10(1/L_km2);

+

+//(c)Attenuation in dB/km due to fundamental rayleigh scattering at 1.30um

+lambda=1.30*10^(-6);             //metre - WAVELENGTH

+Gamma_R=8*(%pi)^3*n^8*p^2*Bc*K*Tf/(3*lambda^4);

+L_km3=exp(-Gamma_R*l)

+A3=10*log10(1/L_km3);

+

+//Displaying the Results in Command Window

+printf("\n\n\t (a)Attenuation in dB/km due to fundamental rayleigh scattering at 0.63um = %0.1f dB/km.",A1);

+printf("\n\n\t (b)Attenuation in dB/km due to fundamental rayleigh scattering at 1.00um = %0.1f dB/km.",A2);

+printf("\n\n\t (c)Attenuation in dB/km due to fundamental rayleigh scattering at 1.30um = %0.1f dB/km.",A3);
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