Photonics

Photonics

Impulse Response of System

    • afshiin.a
      Subscriber

      Hello.
      We know that by applying an impulse signal to the system, the impulse response of that system is obtained. I want to know how to calculate the impulse response of an arbitrary circuit in Lumerical.
      For example, I want to calculate the impulse response of a microring resonator in MODE or FDTD.
      Thank you for your guidance.

    • Kyle
      Ansys Employee

      Hello,

      The simplest way to do this would probably be to use an optical impulse source (https://optics.ansys.com/hc/en-us/articles/360036107594) then record the output with an optical oscilloscope (https://optics.ansys.com/hc/en-us/articles/360036107134).

      • afshiin.a
        Subscriber

        Thank you 🙂

         

    • Kyle
      Ansys Employee

       

      Hello,

      Rereading your post, it seems I misread it. When you mentioned “arbitrary circuit” I assumed you meant INTERCONNECT, but if you want to calculate the impulse response in FDTD or MODE then you will need a different approach because we can’t actually use an impulse source. The DFT monitors in FDTD/varFDTD calculate the transfer function by default, which is the Fourier domain representation of the impulse response. I’m not sure of the details, but I believe you should be able to turn this into the impulse response through an inverse Fourier transform. This page has more information on this: https://optics.ansys.com/hc/en-us/articles/360034915813 

       

      • afshiin.a
        Subscriber

        Thanks for your attention.🙏

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