i am learning optical attenuation and wanted to learn more by using matlab since i am new to matlab i didn't understood this error___Undefined function or variable 'InputPort1'. Error in a (line 2) OutputPort1 = InputPort1;____so can please help me

%
% This program simulates an attenuator 
% Input parameter - Attenuation constant X [dB]
% Input parameter - Attenuation constant Y [dB]
% create an output structure similar to the input
OutputPort1 = InputPort1;
% Attenuation constants
AttenuationX = Parameter0;
AttenuationY = Parameter1;if(InputPort1.TypeSignal == 'Optical')

     [ls, cs] = size(InputPort1.Sampled);
  if( ls > 0 )
          for counter1=1:cs
              % Calculate the signal attenuated in the x polarization
             OutputPort1.Sampled(1, counter1).Signal(1,:) =  InputPort1.Sampled(1, counter1).Signal(1,:) * exp(-0.2303 * 
  AttenuationX / 2);

            % Calculate the signal attenuated in the Y polarization if it exists
             if(size(InputPort1.Sampled(1, counter1).Signal,1) > 1)
                 OutputPort1.Sampled(1, counter1).Signal(2,:) =  InputPort1.Sampled(1, counter1).Signal(2,:) * exp(-0.2303 * 
  AttenuationY / 2);
             end
          end
     end
  % verify how many parameterized signals are in the structure
  [lp, cp] = size(InputPort1.Parameterized);
      if( lp > 0 )
          % Calculate the signal attenuated in the x polarization
  PowerTempX  =  InputPort1.Parameterized.Power .* (1  - InputPort1.Parameterized.SplittingRatio) * exp(-0.2303 * 
  AttenuationX );
          % Calculate the signal attenuated in the y polarization
  PowerTempY  =  InputPort1.Parameterized.Power .* InputPort1.Parameterized.SplittingRatio * exp(-0.2303 * 
  AttenuationY );
          % Calculate the new total optical power at the signal
  OutputPort1.Parameterized.Power =  PowerTempX + PowerTempY;
  % Calculate the new Splitting Ratio at the signal    
  OutputPort1.Parameterized.SplittingRatio =  PowerTempY ./ (PowerTempX + PowerTempY);
      end
  end

Noise bins Signal – Noise bins represent

[ahmed majid]

Dear mr,

Could you please explain the kind of attenuter did you use?.

best regards

Answer 1

[Walter Roberson]

It looks to me as if that code is intended to run as part of a MATLAB "function" within Simulink. Was there a line that started with the word "function" before what you showed?

[muhammad]

http://www.optiwave.com/products/download/optisystem/Matlab%20Optical%20Example.pdf

i found this code on this website but i didn't understood so i wanted to try the code but it did't work and gave an error mentioned above

[Walter Roberson]

That code is for use only within OptiWave's OptiSystem software.

Answer 2

[haydr sami]

hi ahmed majid This code does not work for a unit that must be linked to the OptiSystem program, as it is intended for this