from __future__ import annotations
from typing import Any
from gdsfactory.cell import cell
from gdsfactory.component import Component
from gdsfactory.components.grating_coupler_elliptical_arbitrary import (
grating_coupler_elliptical_arbitrary,
)
from gdsfactory.config import PATH
from gdsfactory.typings import Floats, LayerSpec
parameters = (
-2.4298362615732447,
0.1,
0.48007023217536954,
0.1,
0.607397685752365,
0.1,
0.4498844003086115,
0.1,
0.4274116312627637,
0.1,
0.4757904248387285,
0.1,
0.5026649898504233,
0.10002922416240886,
0.5100366774007897,
0.1,
0.494399635363353,
0.1079599958465788,
0.47400592737426483,
0.14972685326277918,
0.43272750134545823,
0.1839530796530385,
0.3872023336708212,
0.2360175325711591,
0.36032212454768675,
0.24261846353500535,
0.35770350120764394,
0.2606637836858316,
0.3526104381544335,
0.24668202254540886,
0.3717488388788273,
0.22920754299702897,
0.37769616507688464,
0.2246528336925301,
0.3765437598650894,
0.22041773376471022,
0.38047596041838994,
0.21923601658169187,
0.3798873698864591,
0.21700438236445285,
0.38291698672245644,
0.21827768053295463,
0.3641322152037017,
0.23729077006065105,
0.3676834419346081,
0.24865079519725933,
0.34415050295044936,
0.2733570818755685,
0.3306230780901629,
0.27350446437732157,
)
[docs]
@cell
def grating_coupler_elliptical_lumerical(
parameters: Floats = parameters,
layer: LayerSpec = "WG",
layer_slab: LayerSpec | None = "SLAB150",
taper_angle: float = 55,
taper_length: float = 12.24 + 0.36,
fiber_angle: float = 5,
bias_gap: float = 0,
**kwargs,
) -> Component:
"""Returns a grating coupler from lumerical inverse design 3D optimization.
this is a wrapper of components.grating_coupler_elliptical_arbitrary
https://support.lumerical.com/hc/en-us/articles/1500000306621
https://support.lumerical.com/hc/en-us/articles/360042800573
Here are the simulation settings used in lumerical
n_bg=1.44401 #Refractive index of the background material (cladding)
wg=3.47668 # Refractive index of the waveguide material (core)
lambda0=1550e-9
bandwidth = 0e-9
polarization = 'TE'
wg_width=500e-9 # Waveguide width
wg_height=220e-9 # Waveguide height
etch_depth=80e-9 # etch depth
theta_fib_mat = 5 # Angle of the fiber mode in material
theta_taper=30
efficiency=0.55 # 5.2 dB
Args:
parameters: xinput, gap1, width1, gap2, width2 ...
layer: for waveguide.
layer_slab: for slab.
taper_angle: in deg.
taper_length: in um.
fiber_angle: used to compute ellipticity.
bias_gap: gap/trenches bias (um) to compensate for etching bias.
keyword Args:
taper_length: taper length from input in um.
taper_angle: grating flare angle in degrees.
wavelength: grating transmission central wavelength (um).
fiber_angle: fibre angle in degrees determines ellipticity.
neff: tooth effective index.
nclad: cladding effective index.
polarization: te or tm.
spiked: grating teeth include sharp spikes to avoid non-manhattan drc errors.
cross_section: cross_section spec for waveguide port.
"""
parameters = (
parameters.strip().split() if isinstance(parameters, str) else parameters
)
parameters = tuple(float(t) for t in parameters)
# parameters[0] is the xinput
teeth_list = parameters[1:]
gaps = teeth_list[::2]
widths = teeth_list[1::2]
gaps = [gap + bias_gap for gap in gaps]
return grating_coupler_elliptical_arbitrary(
gaps=gaps,
widths=widths,
taper_angle=taper_angle,
taper_length=taper_length,
layer=layer,
layer_slab=layer_slab,
fiber_angle=fiber_angle,
**kwargs,
)
@cell
def grating_coupler_elliptical_lumerical_etch70(**kwargs: Any) -> Component:
c = grating_coupler_elliptical_lumerical(**kwargs)
c.info = dict(
etch_depth=70e-3,
link="https://support.lumerical.com/hc/en-us/articles/1500000306621",
fiber_angle=5,
width_min=0.1,
gap_min=0.1,
efficiency=0.55,
)
return c
def _compare() -> Component:
import gdsfactory as gf
c = Component()
c1 = c << grating_coupler_elliptical_lumerical_etch70(
layer=(2, 0), layer_slab=None, fiber_angle=5
)
c2 = c << gf.import_gds(PATH.gdsdir / "gc.gds")
c2.xmin = 0
c1.xmin = 0.7
return c
if __name__ == "__main__":
# c = _compare()
c = grating_coupler_elliptical_lumerical_etch70()
c.show(show_ports=False)
