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+// Example no 2.8

+// To find the total loss and output power in mW and dBm in fiber

+// Page no. 72

+

+clc;

+clear;

+

+// Given data

+losscoe=0.046;                                 // Loss coefficient in km^-1

+L=80;                                          // Length of fiber in km

+PindBm=3;                                      // Input power in dBm

+

+// To find total loss of fiber

+loss=round(4.343*losscoe*L);                   // Total loss in fiber

+

+// Displaying the result in command window

+printf('\n Total loss in fiber = %0.0f dB',loss);

+

+// To find output power 

+PoutdBm=PindBm-loss;                           // Output power in dBm

+

+PoutmW=10^(PoutdBm/10);                        // Output power in mW

+

+//Displaying the result in command window

+printf('\n Output power of fiber = %0.0f dBm',PoutdBm);

+printf('\n Output power of fiber = %0.2f mW',PoutmW);