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+//chapter 3 example 7//
+clc
+clear
+//operating wavelength=l,total material dispersion=dtm,total waveguide dispersion=dtw,received pulse duration=Tr,transmitted pulse duration=T,approximate bit rate=Bmax,total dispersion=dtt,total intermodal dispersion=dtimd//
+dtm=2.81;//in nanoseconds//
+dtw=0.495;//in nanoseconds//
+T=0.5;//in nanoseconds//
+dtimd=0;
+dtt=sqrt((dtimd^2)+(dtm^2)+(dtw^2));//in nanoseconds//
+Tr=T+dtt;//in nanoseconds//
+Bmax=(1/(5*Tr))*1000;
+printf("\n approximate bit rate=%fMHz \n",Bmax);