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+

+// Example 2.7

+// Calculation of attenuation and Rayleigh scattering coefficient for fiber

+// Page no 50

+clc;

+clear;

+close;

+

+// Given data

+n=1.46;                                      // Refractive index

+p=0.286;                                     // Average photoelastic coefficient

+B=7.25*10^-11;                               // Isothermal compressibility

+k=1.38*10^-23;                               // Boltzmann's constant

+T=1350;                                      // Fictive temperature

+l1=1*10^-6;                                  // Wavelength 1

+l2=1.3*10^-6;                                // Wavelength 2

+L=10^3;                                      // Length

+

+// Rayleigh scattering coefficient for length 1

+y1=8*(%pi)^3*(n)^8*(p)^2*B*k*T/(3*(l1)^4);   

+// Rayleigh scattering coefficient for length 2

+y2=8*(%pi)^3*(n)^8*(p)^2*B*k*T/(3*(l2)^4);   

+y1=y1;

+y2=y2;

+//Attenuation 1

+T1=exp(-(y1*L));                               

+//Attenuation 2

+T2=exp(-(y2*L));                               

+

+//Display result on command window

+printf("\n First Rayleigh scattering coefficient = %0.6f m^-1 ",y1);

+printf("\n Second Rayleigh scattering coefficient = %0.6f m^-1 ",y2);

+

+printf("\n Attenuation (@ Length 1) = %0.2f (dB/km) ",T1);

+printf("\n Attenuation (@ Length 2) = %0.2f (dB/km) ",T2);

+

+