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+//Example 5.3
+//Program to estimate the insertion loss when:
+//(a)there is uniform illumination of all guided modes only 
+//(b)there is uniform illumination of all guided and leaky modes 
+
+clear;
+clc ;
+close ;
+
+//Given data
+y=3*10^(-6);     //metre - LATERAL MISALIGNMENT
+a=25*10^(-6);    //metre - CORE RADIUS
+
+//(a)Misalignment Loss
+Lt1=0.85*(y/a);
+//Coupling efficiency
+eeta_lat1=1-Lt1;
+//Insertion Loss
+Loss_lat1=-10*log10(eeta_lat1);
+
+//(b)Misalignment Loss
+Lt2=0.75*(y/a);
+//Coupling efficiency
+eeta_lat2=1-Lt2;
+//Insertion Loss
+Loss_lat2=-10*log10(eeta_lat2);
+
+//Displaying the Results in Command Window
+printf("\n\n\t (a)Insertion Loss (there is uniform illumination of all guided modes only) is %0.2f dB .",Loss_lat1);
+printf("\n\n\t (b)Insertion Loss (there is uniform illumination of all guided and leaky modes) is %0.2f dB .",Loss_lat2);
+\ No newline at end of file