grating_coupler#

grating_coupler(wl: Union[float, jax.Array] = 1.55, pol: Literal['te', 'tm'] = 'te', thickness: float = 220.0, dwidth: float = 0) → Dict[Tuple[str, str], jaxtyping.Complex[Array, '...']][source]#

SiEPIC EBeam PDK grating coupler optimized for TE polarizations at 1550nm.

The grating coupler efficiently couples light from a fiber array positioned above the chip into the circuit. For the TE mode, the angle is -25 degrees [needs citation].

ebeam_bdc_te1550.png
Parameters

  • wl (float or Array) – The wavelengths to evaluate at in microns.

  • pol ({"te", "tm"}) – Polarization of the input/output modes.

  • thickness ({210.0, 220.0, 230.0}) – Thickness of the grating coupler silicon in nm. Useful for simulating manufacturing variability.

  • dwidth ({-20.0, 0.0, 20.0}) – Change in width from nominal of the gratings. Representative of manufacturing variability. Must be one of -20, 0, or 20.

Raises

  • ValueError – If pol is not ‘te’ or ‘tm’.

  • ValueError – If thickness is not one of 210, 220, or 230.

  • ValueError – If dwidth is not one of -20, 0, or 20.

Notes

See also the PDK documentation: https://github.com/SiEPIC/SiEPIC_EBeam_PDK/blob/master/Documentation/SiEPIC_EBeam_PDK%20-%20Components%20with%20Models.docx