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+//Example 14.7
+//Program to:
+//(a) Convert optical signal powers to dBm
+//(b) Convert optical signal powers to dBu
+
+clear;
+clc ;
+close ;
+
+//(a)Convert optical signal powers to dBm
+Po=5*10^(-3);      //Watt - GIVEN OPTICAL POWER
+dBm=10*log10(Po/1*10^3);
+printf("\n\n\t  (a)The %1.0f mW of optical power is equivalent to %0.2f dBm.",Po/10^(-3), dBm);
+
+Po=20*10^(-6);     //Watt - GIVEN OPTICAL POWER
+dBm=10*log10(Po/1*10^3);
+printf("\n\n\t     The %1.0f uW of optical power is equivalent to %0.2f dBm.",Po/10^(-6), dBm);
+
+//(b)Convert optical signal powers to dBu
+Po=0.03*10^(-3);   //Watt - GIVEN OPTICAL POWER
+dBm=10*log10(Po/1*10^6);
+printf("\n\n\t  (b)The %0.2f mW of optical power is equivalent to %0.2f dBu.",Po/10^(-3), dBm);
+
+Po=800*10^(-9);    //Watt - GIVEN OPTICAL POWER
+dBm=10*log10(Po/1*10^6);
+printf("\n\n\t     The %1.0f nW of optical power is equivalent to %0.2f dBu.",Po/10^(-9), dBm);