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+//clear//
+//Caption:Phased-Array-Based Devices:Length difference between adjacent array waveguides
+//Example10.11
+//page 373
+clear;
+close;
+clc;
+nc = 1.45; //effective refractive index
+Lambda_C = 1550.5e-09; //center wavelength
+delta_Lambda = 32.2e-09; //free spectral range 
+C = 3e08; //free space velocity in m/s
+delta_L = Lambda_C^2/(nc*delta_Lambda);
+disp(delta_L*1e06,'length difference between adjacent array waveguides in um =')
+//Result
+//length difference between adjacent array waveguides in um =51.489618