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()
2024-04-12 23:30:35.696 | INFO | gdsfactory.technology.layer_views:to_lyp:1018 - LayerViews written to '/tmp/gdsfactory/gc_te1550.lyp'.
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)
2024-04-12 23:30:35.915 | WARNING | gdsfactory.technology.layer_stack:get_component_with_derived_layers:123 - UserWarning: decorator is deprecated and will be removed soon. get_component_with_derived_layers
2024-04-12 23:30:35.933 | WARNING | gdsfactory.klive:show:49 - UserWarning: Could not connect to klive server. Is klayout open and klive plugin installed?
23:30:36 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",
)
2024-04-12 23:30:36.639 | INFO | gplugins.tidy3d.write_sparameters_grating_coupler:write_sparameters_grating_coupler:167 - Simulation loaded from PosixPath('/__w/ubc/ubc/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)
2024-04-12 23:30:36.653 | INFO | gplugins.tidy3d.write_sparameters_grating_coupler:write_sparameters_grating_coupler:167 - Simulation loaded from PosixPath('/__w/ubc/ubc/sparameters/gc_-31.0deg_0.0um.npz')
2024-04-12 23:30:36.652 | INFO | gplugins.tidy3d.write_sparameters_grating_coupler:write_sparameters_grating_coupler:167 - Simulation loaded from PosixPath('/__w/ubc/ubc/sparameters/gc_-31.0deg_-5.0um.npz')
2024-04-12 23:30:36.654 | INFO | gplugins.tidy3d.write_sparameters_grating_coupler:write_sparameters_grating_coupler:167 - Simulation loaded from PosixPath('/__w/ubc/ubc/sparameters/gc_-31.0deg_5.0um.npz')
sps[0].result()
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-2.77803566e-01-4.77660467e-01j, -4.28567803e-01-3.17085577e-01j,
-4.98661881e-01-1.17780706e-01j, -4.83231529e-01+8.33155960e-02j,
-3.93130559e-01+2.52179584e-01j, -2.51652782e-01+3.64039582e-01j,
-8.89095016e-02+4.07482245e-01j, 6.52983922e-02+3.85583080e-01j,
1.88082602e-01+3.13172453e-01j, 2.67485699e-01+2.11144364e-01j,
3.02556872e-01+9.98130183e-02j, 2.99702677e-01-5.92389600e-03j,
2.67593739e-01-9.77473567e-02j, 2.13424285e-01-1.71775884e-01j,
1.42205884e-01-2.25167271e-01j, 5.87584281e-02-2.54079234e-01j,
-2.98303991e-02-2.54328249e-01j, -1.13278482e-01-2.24027075e-01j,
-1.79871252e-01-1.66195185e-01j, -2.19759136e-01-8.94955671e-02j,
-2.28111752e-01-6.41306649e-03j, -2.06357340e-01+7.00596186e-02j,
-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()
2024-04-12 23:30:36.687 | INFO | gplugins.tidy3d.write_sparameters_grating_coupler:write_sparameters_grating_coupler:167 - Simulation loaded from PosixPath('/__w/ubc/ubc/sparameters/gc_-31.0deg_-5.0um.npz')
2024-04-12 23:30:36.696 | INFO | gplugins.tidy3d.write_sparameters_grating_coupler:write_sparameters_grating_coupler:167 - Simulation loaded from PosixPath('/__w/ubc/ubc/sparameters/gc_-31.0deg_0.0um.npz')
2024-04-12 23:30:36.699 | INFO | gplugins.tidy3d.write_sparameters_grating_coupler:write_sparameters_grating_coupler:167 - Simulation loaded from PosixPath('/__w/ubc/ubc/sparameters/gc_-31.0deg_5.0um.npz')
<matplotlib.legend.Legend at 0x7f130291de50>
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.