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+//Example 10.3;output signal power and overall gain
+clc;
+clear;
+close;
+format('v',6)
+disp("part (a)")
+psin=1*10^-6;//in watts
+ppin=1;//in watts
+gr=5*10^-14;//mW^-1
+ap1=60*10^-12;//m^2
+l=2000;//meter
+asdb=0.15;//dB/km
+as=3.39*10^-5;//m^-1
+apdb=0.20;//db/km
+ap=4.50*10^-5;//m^-1
+z=(1-exp(-ap*l))/ap;//
+y=(gr/ap1);//
+y1=z*y;//
+y2=y1-(as*l);//
+psl=psin*exp(y2);//
+disp(psl*10^6,"output signal power for forward pumping in micro Watt is")
+format('v',5)
+disp("part (b)")
+y1=z*y;//
+y2=y1-(as*l);//
+psl=psin*exp(y2);//
+gfra=psl/(psin);//
+Gdb=10*log10(gfra);//
+disp(Gdb,"overall gain in dB is")