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+  
+//Caption:Program to determine the BDP of SMF system and DS SMF system using DFB LD 
+ 
+//Example 8.3
+ 
+//Page 393
+ 
+//Refer to table 8.1 on page 392, also to figure 8.6 on page 391
+ 
+smf=16
+
+smf=16//dispersion co-efficient of SMF at 1550nm 
+ 
+sw=0.4//spectral width of the source
+ 
+BDP=[250/(smf*sw)]//assuming line code as NRZ
+
+disp('The BDP of the DS SMF system is determined as')
+
+smf=3.5//dispersion co-efficient of DS SMF at 1550nm
+
+BDP=[250/(smf*sw)]//assuming line code as NRZ 
+
+//Result
+ 
+//BDP = 39 Gbps=km (SMF)
+ 
+//BDP = 179 Gbps-km (DS SMF)
+ 
+\ No newline at end of file