"""Sample AWG."""
from __future__ import annotations
from functools import partial
import numpy as np
import gdsfactory as gf
from gdsfactory.component import Component
from gdsfactory.typings import CrossSectionSpec
@gf.cell
def free_propagation_region(
width1: float = 2.0,
width2: float = 20.0,
length: float = 20.0,
wg_width: float = 0.5,
inputs: int = 1,
outputs: int = 10,
cross_section: CrossSectionSpec = "xs_sc",
) -> Component:
r"""Free propagation region.
Args:
width1: width of the input region.
width2: width of the output region.
length: length of the free propagation region.
wg_width: waveguide width.
inputs: number of inputs.
outputs: number of outputs.
cross_section: cross_section function.
.. code::
length
<-->
/|
/ |
width1| | width2
\ |
\|
"""
y1 = width1 / 2
y2 = width2 / 2
xs = gf.get_cross_section(cross_section)
o = 0
layer = xs.layer
xpts = [0, length, length, 0]
ypts = [y1, y2, -y2, -y1]
c = gf.Component()
c.add_polygon((xpts, ypts), layer=layer)
if inputs == 1:
c.add_port(
"o1",
center=(0, 0),
width=wg_width,
orientation=180,
layer=layer,
)
else:
y = np.linspace(-width1 / 2 + wg_width / 2, width1 / 2 - wg_width / 2, inputs)
y = gf.snap.snap_to_grid(y)
for i, yi in enumerate(y):
c.add_port(
f"W{i}",
center=(0, yi),
width=wg_width,
orientation=180,
layer=layer,
)
y = np.linspace(-width2 / 2 + wg_width / 2, width2 / 2 - wg_width / 2, outputs)
y = gf.snap.snap_to_grid(y)
for i, yi in enumerate(y):
c.add_port(
f"E{i}",
center=(length, yi),
width=wg_width,
orientation=0,
layer=layer,
)
ypts = [y1 + o, y2 + o, -y2 - o, -y1 - o]
c.info["length"] = length
c.info["width1"] = width1
c.info["width2"] = width2
return c
free_propagation_region_input = partial(free_propagation_region, inputs=1)
free_propagation_region_output = partial(
free_propagation_region, inputs=10, width1=10, width2=20.0
)
[docs]
@gf.cell
def awg(
arms: int = 10,
outputs: int = 3,
free_propagation_region_input_function=free_propagation_region_input,
free_propagation_region_output_function=free_propagation_region_output,
fpr_spacing: float = 50.0,
) -> Component:
"""Returns a basic Arrayed Waveguide grating.
Args:
arms: number of arms.
outputs: number of outputs.
free_propagation_region_input_function: for input.
free_propagation_region_output_function: for output.
fpr_spacing: x separation between input/output free propagation region.
"""
c = Component()
fpr_in = free_propagation_region_input_function(
inputs=1,
outputs=arms,
)
fpr_out = free_propagation_region_output_function(
inputs=outputs,
outputs=arms,
)
fpr_in_ref = c.add_ref(fpr_in)
fpr_out_ref = c.add_ref(fpr_out)
fpr_in_ref.rotate(90)
fpr_out_ref.rotate(90)
fpr_out_ref.x += fpr_spacing
routes = gf.routing.get_bundle(
fpr_in_ref.get_ports_list(prefix="E"),
fpr_out_ref.get_ports_list(prefix="E"),
enforce_port_ordering=False,
)
c.lengths = []
for route in routes:
c.add(route.references)
c.lengths.append(route.length)
c.add_port("o1", port=fpr_in_ref.ports["o1"])
for i, port in enumerate(fpr_out_ref.get_ports_list(prefix="W")):
c.add_port(f"E{i}", port=port)
c.delta_length = np.mean(np.diff(c.lengths))
return c
if __name__ == "__main__":
# c = free_propagation_region(inputs=2, outputs=4)
c = awg()
c.show(show_ports=True)
