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// Ex16_3 Page:311 (2014)
clc;clear;
z = 30; // Length of the optical fibre, km
alpha = 0.8; // Fibre loss, dB/km
P_i = 200; // Power input to the optical fibre, micro-watt
P_o = P_i/10^(alpha*z/10); // Output power of the optical fibre, micro-watt
printf("\nThe output power from the optical fibre = %5.3f micro-watt", P_o);
// Result
// The output power from the optical fibre = 0.796 micro-watt
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