Grating coupler FDTD simulations#
You can also expand the planar component simulations to simulate an out-of-plane grating coupler.
You can run grating coupler simulations in 2D to save time, and for accuracy you can also run them in 3D
tidy3d#
import gplugins.tidy3d as gt
import matplotlib.pyplot as plt
import numpy as np
import ubcpdk.components as pdk
from ubcpdk.config import PATH
c = pdk.gc_te1550()
c.plot()
fiber_angle_deg = -31
s = gt.get_simulation_grating_coupler(
c, is_3d=False, fiber_angle_deg=fiber_angle_deg, fiber_xoffset=0
)
f = gt.plot_simulation(s)
Adding layer=WG, layer_tuple=(1, 0) zmin=0.0, zmax=0.22 material_name='si'
17:37:00 UTC WARNING: The medium associated with structures[1] has a frequency range: (1.692592e+14, 1.208995e+15) (Hz) that does not fully cover the frequencies contained in monitors[0]. This can cause inaccuracies in the recorded results.
WARNING: Suppressed 1 WARNING message.
def log(x):
return 20 * np.log10(x)
sp = gt.write_sparameters_grating_coupler(
c,
is_3d=False,
fiber_angle_deg=fiber_angle_deg,
fiber_xoffset=0,
filepath=PATH.sparameters / "gc_te1550.npz",
)
offsets = np.arange(-5, 5 + 1, 5)
offsets
array([-5, 0, 5])
jobs = [
dict(
component=c,
is_3d=False,
fiber_angle_deg=fiber_angle_deg,
fiber_xoffset=fiber_xoffset,
dirpath=PATH.sparameters,
filepath=PATH.sparameters
/ f"gc_{fiber_angle_deg:.1f}deg_{fiber_xoffset:.1f}um.npz",
)
for fiber_xoffset in offsets
]
sps = gt.write_sparameters_grating_coupler_batch(jobs)
sps[0].result()
{'wavelengths': array([1.2 , 1.20235294, 1.20470588, 1.20705882, 1.20941176,
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1.23529412, 1.23764706, 1.24 , 1.24235294, 1.24470588,
1.24705882, 1.24941176, 1.25176471, 1.25411765, 1.25647059,
1.25882353, 1.26117647, 1.26352941, 1.26588235, 1.26823529,
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1.50588235, 1.50823529, 1.51058824, 1.51294118, 1.51529412,
1.51764706, 1.52 , 1.52235294, 1.52470588, 1.52705882,
1.52941176, 1.53176471, 1.53411765, 1.53647059, 1.53882353,
1.54117647, 1.54352941, 1.54588235, 1.54823529, 1.55058824,
1.55294118, 1.55529412, 1.55764706, 1.56 , 1.56235294,
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1.62352941, 1.62588235, 1.62823529, 1.63058824, 1.63294118,
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1.70588235, 1.70823529, 1.71058824, 1.71294118, 1.71529412,
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-1.61220618e-01+1.29655528e-01j, -1.02283542e-01+1.66687961e-01j,
-3.93673435e-02+1.80166091e-01j, 1.94253933e-02+1.72705269e-01j,
6.85303836e-02+1.48971361e-01j, 1.04949576e-01+1.14266364e-01j])}
for fiber_xoffset in offsets:
sp = gt.write_sparameters_grating_coupler(
c,
is_3d=False,
fiber_angle_deg=fiber_angle_deg,
fiber_xoffset=fiber_xoffset,
filepath=PATH.sparameters
/ f"gc_{fiber_angle_deg:.1f}deg_{fiber_xoffset:.1f}um.npz",
)
plt.plot(
sp["wavelengths"],
20 * np.log10(np.abs(sp["o2@0,o1@0"])),
label=str(fiber_xoffset),
)
plt.xlabel("wavelength (um")
plt.ylabel("Transmission (dB)")
plt.title("transmission vs fiber xoffset (um)")
plt.legend()
<matplotlib.legend.Legend at 0x7ff7c8304450>
help(gt.write_sparameters_grating_coupler)
Help on function write_sparameters_grating_coupler in module gplugins.tidy3d.write_sparameters_grating_coupler:
write_sparameters_grating_coupler(component: 'ComponentSpec', dirpath: 'PathType | None' = None, filepath: 'PathType | None' = None, overwrite: 'bool' = False, port_waveguide_name: 'str' = 'o1', fiber_port_prefix: 'str' = 'o2', verbose: 'bool' = False, run: 'bool' = True, **kwargs) -> 'Sparameters'
Get sparameter matrix from a gdsfactory grating coupler.
Assumes grating coupler waveguide port is facing to the left (west).
TODO: add a fiber model (more realistic than a gaussian_beam).
Args:
component: grating coupler gdsfactory Component to simulate.
dirpath: directory to store sparameters in npz.
Defaults to active Pdk.sparameters_path.
filepath: optional sparameters file.
overwrite: overwrites stored Sparameter npz results.
verbose: prints info messages and progressbars.
run: runs simulation, if False, only plots simulation.
Keyword Args:
port_extension: extend ports beyond the PML.
layer_stack: contains layer to thickness, zmin and material.
Defaults to active pdk.layer_stack.
thickness_pml: PML thickness (um).
xmargin: left/right distance from component to PML.
xmargin_left: left distance from component to PML.
xmargin_right: right distance from component to PML.
ymargin: left/right distance from component to PML.
ymargin_top: top distance from component to PML.
ymargin_bot: bottom distance from component to PML.
zmargin: thickness for cladding above and below core.
clad_material: material for cladding.
box_material: for bottom cladding.
substrate_material: for substrate.
box_thickness: bottom cladding thickness in (um).
substrate_thickness: (um).
port_waveguide_name: input port name.
port_margin: margin on each side of the port.
distance_source_to_monitors: in (um) source goes before monitors.
port_waveguide_offset: mode solver workaround.
positive moves source forward, negative moves source backward.
wavelength: source center wavelength (um).
if None takes mean between wavelength_start, wavelength_stop.
wavelength_start: in (um).
wavelength_stop: in (um).
wavelength_points: number of wavelengths.
plot_modes: plot source modes.
num_modes: number of modes to plot.
run_time_ps: make sure it's sufficient for the fields to decay.
defaults to 10ps and counts on the automatic shutoff
to stop earlier if needed.
fiber_port_prefix: port prefix to place fiber source.
fiber_xoffset: fiber center xoffset to fiber_port_name.
fiber_z: fiber zoffset from grating zmax.
fiber_mfd: fiber mode field diameter (um).
fiber_angle_deg: fiber_angle in degrees with respect to normal.
material_name_to_tidy3d: dispersive materials have a wavelength dependent index.
Maps layer_stack names with tidy3d material database names.
is_3d: True by default runs in 3D.
with_all_monitors: stores all monitor fields.