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lamda_b=1550;  % design wavelength unit nm
%% fraction index calculation
l1=68.4043;
l2=116.2414;
l3=9896.161;
b1=0.6961663;
b2=0.4079426;
b3=0.897479;
n1=sqrt(1+b1/(1-(l1/lamda_b)^2)+b2/(1-(l2/lamda_b)^2)+b3/(1-(l3/lamda_b)^2));  % refraction of Sio2 of fiber core
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