How do I inject an optical mode in a waveguide bend?#

Date	Category
2023-12-08 15:10:49	Sources

To inject an optical mode in a waveguide bend, you must set the bend_radius and bend_axis parameters of tidy3d.ModeSpec. For example:

# Source bandwidth.
pulse = tidy3d.GaussianPulse(freq0=1.934e14, fwidth=6.245e12)

# Mode specification.
mode_spec = tidy3d.ModeSpec(target_neff=2.5, bend_radius=-5, bend_axis=1)

# Source definition
source = tidy3d.ModeSource(
  center=(0, 0, -2),
  size=(0, 2, 1.5),
  source_time=pulse,
  direction='+',
  mode_spec=mode_spec,
  mode_index=0,
  name="mode_source",
)

You can find a detailed example in this notebook.