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+// Example 8.5;//minumum incident optical power
+clc;
+clear;
+close;
+nmax=732;//
+c=3*10^8;//m/s
+ht=6.62*10^-34;//plank constt.
+B=10^7;//NO. OF BITS
+h=1*10^-6;//wavelength in meter
+Po=((nmax*ht*B*c)/(2*h))*10^12;//pulse energy in pico Watt
+Podb=10*(log10(Po));//pulse energy in dB when refrence level is one Watt
+Podb1=10*(log10(Po*10^-9));//pulse energy in dB when refrence level is one mili Watt
+disp(Podb1 , "pulse energy at bit rate of 10 M bit s^-1 in dBm")
+B1=14*10^7;//NO. OF BITS
+Po1=((nmax*ht*B1*c)/(2*h))*10^12;//pulse energy in pico Watt
+Podb1=10*(log10(Po1));//pulse energy in dB when refrence level is one Watt
+Podb2=10*(log10(Po1*10^-9));//pulse energy in dB when refrence level is one mili Watt
+disp(Podb2 , "pulse energy at bit rate of 140 M bit s^-1 in dBm")
+//at 10 M bit s^-1 power is calc ulated wrong in the book
+