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+// Example 6.6
+// Calculation of (a) the saturation power and (b) the bias current I
+// Page no 273
+
+clc;
+clear;
+close;
+
+//Given data
+
+c=3*10^8;                // Velocity of light
+lambda=1530*10^-9;      // Wavelength
+t=0.3                   // Overlap factor
+r=7.3*10^-20;           // Gain cross section
+r0=1*10^-9;            // Carrier lifetime
+q=1.609*10^-19;     
+v=7.5*10^-16;         // Active volume
+h=6.63*10^-34         // Planck constant
+A=5*10^-6;            // Effective area
+g=4.82*10^3;          // Small signal gain coeffifient
+N=3.5*10^23;          // 
+
+// (a) the saturation power and 
+
+
+f=c/lambda;
+Ps=(h*f*A)/(t*r*r0);
+Ps=Ps*10^-3;
+
+// (b) the bias current I
+
+I=(g/(r*r0)+N/r0)*q*v;
+I=I*10^3;
+// Displaying results in the command window            
+printf("\n The saturation power Psat = %0.3f mW ",Ps);
+
+printf("\n The bias current I = %0.3f mA ",I);
+
+
+// The answers vary due to round off error