Photonics

Photonics

Adiabatic vertical coupling

    • venkatasatyasaidharmateja.paladugu
      Subscriber

      Hi,

      I am trying to visualize the vertical mode coupling between Silicon and Lithium Niobate waveguide. Using FDE solver, I am able to see correct modes at selected cross sections. However, if I try to use propagate in FDE or FDTD solver, I am seeing a drop in E magnitude along the length of Silicon but no significant increase in E magnitude along Lithium Niobate waveguide. Can someone please help me with this?

      Below result is FDTD 1D monitor (along length) through center of Si (Blue) and Lithium Niobate (Green) waveguides.

    • Guilin Sun
      Ansys Employee

      Without seeing the settings, I can only guess: please significantly increase the simulation time, reduce autsohutoff min, and make sure the PML is sufficiently thick, usually half wavelength. You can use a time monitor at the output end and make sure the signal decays completely when the simulation terminates.

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