FDE solver equations

- February 1, 2022 at 11:28 pm
  mwhitby
  Subscriber
  I believe that all of the equations here are created based on an electric field propagating in the positive z-direction. If I instead have my electric field propagating along the y axis and the optical field along the x axis:
  Will the formula for loss change? It doesn't seem to be dependent on the axis definitions.
  Will the formula for propagation along the x direction ("TE polarization fraction Ey") change? If so what would it be?
  Thanks!
- February 3, 2022 at 2:49 am
  
  Kyle
  Ansys Employee
  
  The loss is calculated from the imaginary part of the effective index, so the direction of propagation won't affect this formula.
  I'm not sure if I understand this question. You originally said that the direction of propagation is along the y axis, but here are asking about how this changes the formula for propagation along the x direction. The direction of propagation for the mode is the direction normal to the plane of the FDE solver. For each direction of propagation there is a slightly different definition of TE polarization fraction, which are given on that page you linked:

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