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Amplitude Modulator

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(joined March 2014)
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Attached is an amplitude modulator programmed in Matlab. The component accepts an optical signal and modulates its signal according to another electrical signal.

The optical signal can be any number of sampled signals centered at different central frequencies as well as including noise bins and parameterized signals. Depending on which type of input signal is present, the associated Matlab function will be called (AmplitudeModulatorNoise.m for noise).

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    • #26404
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      Damian Marek
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      Attached is an amplitude modulator programmed in Matlab. The component accepts an optical signal and modulates its signal according to another electrical signal.

      The optical signal can be any number of sampled signals centered at different central frequencies as well as including noise bins and parameterized signals. Depending on which type of input signal is present, the associated Matlab function will be called (AmplitudeModulatorNoise.m for noise).

    • #26434
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      Damian Marek
      Participant

      Matlab code follows:

      Main Component File:

      global ModulationIndex

      OutputPort1 = InputPort1; % create an output structure

      ModulationIndex = Parameter0;

      SampledNumber = length(InputPort1.Sampled);
      ParameterizedNumber = length(InputPort1.Parameterized);
      NoiseNumber = length(InputPort1.Noise);

      if( SampledNumber > 0 ) % if there is sampled signal do

      for i=1:SampledNumber

      OutputPort1.Sampled(i).Signal(1,:) = AmplitudeModulatorSampled(InputPort1.Sampled(i).Signal(1,:), real(InputPort2.Sampled.Signal))

      PolarizationNumber = size(InputPort1.Sampled(i).Signal,1);

      if( PolarizationNumber == 2)

      OutputPort1.Sampled(i).Signal(2,:) = AmplitudeModulatorSampled(InputPort1.Sampled(i).Signal(2,:), real(InputPort2.Sampled.Signal));

      end;
      end
      end;

      if( ParameterizedNumber > 0 ) %if there is parameterized signal do

      for i=1:ParameterizedNumber

      OutputPort1.Parameterized.Power = AmplitudeModulatorParameterized(InputPort1.Parameterized.Power, real(InputPort2.Sampled.Signal));

      end
      end;

      if( NoiseNumber > 0 ) %if there noise signal do

      for i=1:NoiseNumber

      OutputPort1.Noise.Power = AmplitudeModulatorNoise(InputPort1.Noise.Power, real(InputPort2.Sampled.Signal));

      end
      end;

      Modulate for Noise Bins:

      function y = AmplitudeModulatorNoise( Noise, dModulation )

      global ModulationIndex

      nSize = length(dModulation);

      dSum = 0;

      dSum = dSum + sum( (1 – ModulationIndex) + ModulationIndex * dModulation );

      dSum = dSum / nSize;

      y = Noise * dSum;

      Modulate for Parameterized Signals:

      function y = AmplitudeModulatorParameterized(Parameterized, dModulation);

      global ModulationIndex

      nSize = length(dModulation);

      dSum = 0;

      dSum = sum( (1 – ModulationIndex) + ModulationIndex * dModulation );

      dSum = dSum / nSize;

      y = Parameterized * dSum;

      Modulate for sampled signals:

      function y = AmplitudeModulatorSampled(pccE, dModulation);

      global ModulationIndex

      nSize = length(pccE);
      dModL = length(dModulation);

      resize = ones(1, nSize/dModL);
      resize = kron(dModulation, resize);
      resize(nSize+1:end) = [];

      for i = 1:nSize,
      pccE(i) = pccE(i) * sqrt( (1 – ModulationIndex) + ModulationIndex * resize( i ) );
      end;

      y = pccE;

      +1

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