Optical

Optical

Negative waveguide loss

    • 能勢武尊
      Subscriber

      Bending loss is calculated.
      The result is negative loss as shown in the following picture.
      Why is this?

      Also, when the mesh is eliminated, the loss becomes positive. Why is this?

    • Guilin Sun
      Ansys Employee

      This is numerical error due to discretization. You may increase the simulation span along the bending direction. You can also correct this negative loss by allowing mode propagating in the negative direction, eg, real(neff) is negative. In most cases it is ok to have the fake "gain" as you know it is due to error.

    • Guilin Sun
      Ansys Employee

      For Lumerical products, please write post here Photonics (ansys.com)  which is a dedicated forum for Lumerical products.

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