modelig optical fiber attenuation and dispersion using matlab

[mohammed hosni]

i need to know the error with the attached m file matlab which is modeling attenuation and dispersion for optical fiber and use it in optisystem

[Dr Rk Sethi]

Mohammed Hosni HI!
can you explain what error, are you getting during the simulation of the same?

% Create an output structure similar to the input
OutputPort1 = InputPort1;
% Attenuation constant
A = Parameter0;%attenuation of fiber db/km
L=Parameter1;%Length of fiber in km
D=Parameter2;%dispersion of fiber
% calculate the optical signal attenuation
if strcmp(InputPort1.TypeSignal ,’Optical’)
% verify how many sampled signals are in the structure
[ls, cs] = size(InputPort1.Sampled);
if( ls > 0 )
% calculate the attenuation at each signal
for counter1=1:cs
OutputPort1.Sampled(1, counter1).Signal = InputPort1.Sampled(1, counter1).Signal * 10^((-1 * A*L) / 10);
end
end
[lp, cp] = size(InputPort1.Parameterized);
if( lp > 0 )
OutputPort1.Parameterized.Linewidth = InputPort1.Parameterized.Linewidth .*L*D ;
OutputPort1.Parameterized.Power = InputPort1.Parameterized.Power .*(10^((-A*L)/10)) ;

end
end

Regards,

[mohammed hosni]

the erorr in
OutputPort1.Parameterized.Linewidth = InputPort1.Parameterized.Linewidth .*L*D ;
as in the Parameriezed optical signal structure launched into matlab there isn’t linewidth

[Dr Rk Sethi]

Mohammed Hosni HI!
I think you are missing some parameter before *L*D in the following line:
OutputPort1.Parameterized.Linewidth = InputPort1.Parameterized.Linewidth .*L*D ;

[mohammed hosni]

how the m.file code would be??

[Dr Rk Sethi]

Mohammed Hosni HI!
As I said in previous post that you are missing some parameter before *L*D in the following line:
OutputPort1.Parameterized.Linewidth = InputPort1.Parameterized.Linewidth .*L*D ;

the m.file code will depend on the equations you are using for the modeling of attenuation and dispersion for optical fiber.
what equations are you using for the same?
Regards.

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