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modelig optical fiber attenuation and dispersion using matlab

(joined April 2015)
Participant

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

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Responses (5):

    • #20106
      mohammed hosni
      Participant

      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

      Attachments:
    • #20221
      Dr Rk Sethi
      Participant

      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,

      +1
    • #20222
      mohammed hosni
      Participant

      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

    • #20227
      Dr Rk Sethi
      Participant

      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 ;

    • #20257
      mohammed hosni
      Participant

      how the m.file code would be??

    • #20271
      Dr Rk Sethi
      Participant

      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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