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diff --git a/1655/CH4/EX4.3.1/Example_4_3_1.sce b/1655/CH4/EX4.3.1/Example_4_3_1.sce
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index 000000000..3af096649
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+++ b/1655/CH4/EX4.3.1/Example_4_3_1.sce
@@ -0,0 +1,23 @@
+
+
+// Example 4.3.1  page 4.4
+
+clc;
+clear;
+
+L=10;       //fiber length in km
+Pin=150d-6;     //input power
+Pout=5d-6;      //output power
+len=20;       //length of optical link
+interval=1;     //splices after interval of 1 km
+l=1.2;      //loss due to 1 splice
+
+attenuation=10*log10(Pin/Pout);
+alpha=attenuation/L;
+attenuation_loss=alpha*20;
+splices_loss=(len-interval)*l;
+total_loss=attenuation_loss+splices_loss;
+power_ratio=10^(total_loss/10);
+
+printf("\nSignal attenuation is %.2f dBs.\nSignal attenuation is %.3f dB/Km.\nTotal loss in 20 Km fiber is %.2f dbs.\nTotal attenuation is %.2f dBs.\ninput/output ratio is %e.",attenuation,alpha,attenuation_loss,total_loss,power_ratio);
+printf("\nAs signal attenuation is approximately equal to 10^5, we can say that line is very lossy.");