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+//clear//
+//Caption:Maximum number of channels that can be placed in the tuning range
+//Example10.12
+//page 383
+clear;
+clc;
+close;
+Lambda = 1550e-09; //DBR laser operating wavelength
+delta_neff = 0.0065; //maximum index change 
+delta_Lambda_tune = Lambda*delta_neff; //tuning range in meters
+delta_Lambda_signal = 0.02e-09; //source spectral width in meters
+delta_Lambda_channel = 10*delta_Lambda_signal;
+N = delta_Lambda_tune/delta_Lambda_channel;
+disp(N,'The number channels that can operate in this tuning range is N=')
+//Result
+//The number channels that can operate in this tuning range is N = 50.375