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Ansys Learning Forum › Forums › Discuss Simulation › Photonics › FDTD error: The source is not large enough to calculate a mode › Reply To: FDTD error: The source is not large enough to calculate a mode

July 17, 2024 at 3:50 pm
Greg Baethge
Ansys Employee

Hi Tim,

Thanks for posting your question. Could you check the mesh over the waveguide? The PML boundaries look quite thick, that typically happens either when using a large number of layers or when using a coarse mesh. So I would check the mesh size over the waveguide with respect to the waveguide dimensions and the wavelength range.

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