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+//Example 11.2:position 
+clc;
+clear;
+close;
+a=8.2;//in micro meter
+n1=1.45;//
+n2=1.446;//
+h1=1.31;//in micro meter
+h2=1.55;///in micro meter
+v1=((2*%pi*a*sqrt(n1^2-n2^2))/h1);//
+v2=((2*%pi*a*sqrt(n1^2-n2^2))/h2);//
+db=2.439;//
+del=5.5096*10^-3;//
+k1=1.0483;//mm^-1;//
+k2=1.2839///m^-1
+l1=((%pi)/(4*k1));//in mm
+l2=((%pi)/(4*k2));//in mm
+disp("output port positioned at "+string(l2)+" mm with respect to the input port will gather signals at h1=1310nm")
+disp("output port positioned at "+string(l1)+" mm with respect to the input port will gather signals at h1=1550nm")