get_R_grating

awg_designer.all.get_R_grating(FSR, channel_spacing, output_spacing, grating_period, wl, slab_n_eff)

Calculates the minimal grating radius such that all channels fit in the first order diffraction of the grating.

The first order diffraction angle is calculated from the grating_period, wl and slab_n_eff.

Parameters:

FSR: float: Free spectral range [GHz].
channel_spacing: float: Channel spacing [GHz]. By dividing FSR / channel_spacing, we get the ‘effective’ number of outputs.
output_spacing: float: The spacing between the output apertures.
grating_period: float: The grating period.
wl: float: Wavelength (choose the lowest wavelength that you want to support).
slab_n_eff: float: Effective index of the slab (at wavelength ‘wl’).

Returns: