WDM system using cascaded ring modulators

    • Mohammed.elsayed

      Dear all,

      I am trying to do WDM system with 3 cascaded ring modulators. I am not using the Lumerical interconnect ring modulator component. I am using instead of the ring component, two passive waveguides, coupler, and active waveguide for the modulation. Unfortunately, the system works only with one wavelength. when I adjust the sample mode frequency to automatic, only at middle wavelength, the modulation occurs. when I adjust it to the sample mode frequency to single and put for example the value of the first wavelength, the modulation occurs only at the first wavelength.

      Could you please help me to solve the problem by modulation the three wavelengths of the three rings at the same time?

      Please check the screenshots.

      Thank you very much

    • Greg Baethge
      Ansys Employee

      Hi Mohammed,

      Apologies for the delayed response. The results you are looking at is from the optical spectrum analyzer, so it corresponds to the spectrum at optical frequencies, and it won't be able to show the modulation of the signal that is at much lower frequencies.

      In our WDM example, we use a demultiplexer to isolate the signal of each band and plot their eye diagram. I think a similar approach should be used.

      Let us know if you have any question.

    • Mohammed.elsayed

      Hi Greg Baethge

      the problem is when I use cascaded Lumerical ring modulators components, the modulation happens for all wavelengths, but when we make the ring compnent which consists of (coupler, two straight waveguide for passive modulation and one component for the active modulation) as you can seen from the picture only one wavelength from the ring modulator will be modulated and the others not. I think the problem related to the some layout prameters for the sample mode frequency. can you help me to find a solution of this? I need to make all the ring modulators work by modulating all the wavelengths. 

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