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+//clear//
+//Caption: Four-wave mixing-calculation of power generated due to the
+//interaction of signals at different frequencies
+//Example12.3
+//page 438
+clear;
+clc;
+close;
+chi1111 = 6e-15;//Third order nonlinear suceptibility cubicmeter/W.s
+D =3; //degenerating factor
+Leff = 22e03;//effective length in meters
+Aeff = 6.4e-11;//effective cross-sectional area of the fiber in square meter
+etta = 0.05;//quantum efficiency
+Lambda = 1540e-09; //Wavelength in single mode fibers in meter
+C = 3e08; //free space velocity in m/sec
+alpha =0.0461; //atttenuation per Km
+L =75; //fiber link length in Km
+P = 1e-03; //each channel input power of 1 milli watts
+n = 1.48; //refractive index
+k = ((32*(%pi^3)*chi1111)/((n^2)*Lambda*C))*(Leff/Aeff); //nonlinear interaction constant
+P112 = etta*(D^2)*(k^2)*(P^3)*exp(-alpha*L);
+disp(P112*1e03,'Power generated due to interaction of signals at different freq. in milli watts P112=')
+//Result
+// Power generated due to interaction of signals at different freq. in milli watts P112= // 5.798D-08