from __future__ import annotations
import numpy as np
import gdsfactory as gf
from gdsfactory import Component
from gdsfactory.typings import ComponentSpec, CrossSectionSpec, LayerSpec
def _compute_parameters(xs_bend, wrap_angle_deg, radius):
r_bend = xs_bend.radius
theta = wrap_angle_deg / 2.0
size_x, dy = (
r_bend * np.sin(theta * np.pi / 180),
r_bend - r_bend * np.cos(theta * np.pi / 180),
)
bus_length = max(4 * size_x, 2 * radius)
return (r_bend, size_x, dy, bus_length)
def _generate_bends(c, r_bend, wrap_angle_deg, cross_section):
if wrap_angle_deg != 0:
input_arc = gf.path.arc(radius=r_bend, angle=-wrap_angle_deg / 2.0)
bend_middle_arc = gf.path.arc(radius=r_bend, angle=-wrap_angle_deg)
bend_input_output = input_arc.extrude(cross_section=cross_section)
bend_input = c << bend_input_output
bend_middle = c << bend_middle_arc.extrude(cross_section=cross_section)
bend_middle.rotate(180 + wrap_angle_deg / 2.0, center=c.center)
bend_input.connect("o2", bend_middle.ports["o2"])
bend_output = c << bend_input_output
bend_output.mirror()
bend_output.connect("o2", bend_middle.ports["o1"])
return (c, bend_input, bend_middle, bend_output)
else:
return (c, None, None, None)
def _generate_straights(c, bus_length, size_x, bend_input, bend_output, cross_section):
straight_left = c << gf.components.straight(
length=(bus_length - 4 * size_x) / 2.0, cross_section=cross_section
)
straight_right = c << gf.components.straight(
length=(bus_length - 4 * size_x) / 2.0, cross_section=cross_section
)
if None not in (bend_input, bend_output):
straight_left.connect("o2", bend_input.ports["o1"])
straight_right.connect("o1", bend_output.ports["o1"])
else:
straight_left.connect("o2", straight_right.ports["o1"])
return (c, straight_left, straight_right)
def _generate_circles(
c, radius: float, xs, bend_middle, straight_left, r_bend, dy: float
):
"""Returns Component, circle and circle_cladding.
Args:
c: component.
radius: in um.
xs: cross_section:
bend_middle: bend spec.
straight_left: spec.
r_bend: spec.
dy: in um.
"""
circle = c << gf.components.circle(radius=radius, layer=xs.layer)
circle_cladding = None
if bend_middle is not None:
circle.move(
origin=circle.center,
destination=(
(bend_middle.ports["o1"].x + bend_middle.ports["o2"].x) / 2.0,
straight_left.ports["o2"].y - 2 * dy + r_bend,
),
)
else:
circle.move(
origin=circle.center,
destination=(straight_left.ports["o2"].center + (0, r_bend),),
)
if circle_cladding:
circle_cladding.move(origin=circle_cladding.center, destination=circle.center)
return (c, circle, circle_cladding)
def _absorb(c, *refs):
for ref in list(refs):
if ref is not None:
c.absorb(ref)
return c
[docs]
@gf.cell
def disk(
radius: float = 10.0,
gap: float = 0.2,
wrap_angle_deg: float = 180.0,
parity: int = 1,
cross_section: CrossSectionSpec = "xs_sc",
) -> Component:
"""Disk Resonator.
Args:
radius: disk resonator radius.
gap: Distance between the bus straight and resonator.
wrap_angle_deg: Angle in degrees between 0 and 180.
determines how much the bus straight wraps along the resonator.
0 corresponds to a straight bus straight.
180 corresponds to a bus straight wrapped around half of the resonator.
parity (1 or -1): 1, resonator left from bus straight, -1 resonator to the right.
cross_section: cross_section spec.
"""
if parity not in (1, -1):
raise ValueError("parity must be 1 or -1")
if wrap_angle_deg < 0.0 or wrap_angle_deg > 180.0:
raise ValueError("wrap_angle_deg must be between 0.0 and 180.0")
c = gf.Component()
xs = gf.get_cross_section(cross_section=cross_section)
radius_disk = radius
radius = radius + xs.width / 2.0 + gap
xs_bend = xs.copy(radius=radius)
r_bend, size_x, dy, bus_length = _compute_parameters(
xs_bend, wrap_angle_deg, radius
)
c, bend_input, bend_middle, bend_output = _generate_bends(
c, r_bend, wrap_angle_deg, xs_bend
)
c, straight_left, straight_right = _generate_straights(
c, bus_length, size_x, bend_input, bend_output, xs_bend
)
c, circle, circle_cladding = _generate_circles(
c, radius_disk, xs, bend_middle, straight_left, r_bend, dy
)
c = _absorb(
c,
circle,
circle_cladding,
straight_left,
straight_right,
bend_input,
bend_middle,
bend_output,
)
c.add_port("o1", port=straight_left.ports["o1"], layer="PORT")
c.add_port("o2", port=straight_right.ports["o2"])
xs.add_bbox(c)
if parity == -1:
c = c.rotate(180)
return c
[docs]
@gf.cell
def disk_heater(
radius: float = 10.0,
gap: float = 0.2,
wrap_angle_deg: float = 180.0,
parity: int = 1,
cross_section: CrossSectionSpec = "xs_sc",
heater_layer: LayerSpec = "HEATER",
via_stack: ComponentSpec = "via_stack_heater_mtop",
heater_width: float = 5.0,
heater_extent: float = 2.0,
via_width: float = 10.0,
port_orientation: float | None = 90,
) -> Component:
"""Disk Resonator with top metal heater.
Args:
radius: disk resonator radius.
gap: Distance between the bus straight and resonator.
wrap_angle_deg: Angle in degrees between 0 and 180.
determines how much the bus straight wraps along the resonator.
0 corresponds to a straight bus straight.
180 corresponds to a bus straight wrapped around half of the resonator.
parity (1 or -1): 1, resonator left from bus straight, -1 resonator to the right.
cross_section: cross_section spec.
heater_layer: layer of the heater.
heater_width: width of the heater.
heater_extent: length of heater beyond disk.
via_width: size of the square via at the end of the heater.
port_orientation: in degrees.
"""
c = gf.Component()
xs = gf.get_cross_section(cross_section=cross_section)
disk_instance = c << disk(
radius=radius,
gap=gap,
wrap_angle_deg=wrap_angle_deg,
parity=parity,
cross_section=cross_section,
)
dx = disk_instance.xmax - disk_instance.xmin
dy = disk_instance.ymax - disk_instance.ymin
heater = c << gf.get_component(
gf.components.rectangle,
size=(dx + 2 * heater_extent, heater_width),
layer=heater_layer,
)
heater.x = disk_instance.x
heater.y = dy / 2 + disk_instance.ymin + (xs.width + gap) / 2
via = gf.get_component(via_stack, size=(via_width, via_width))
c1 = c << via
c2 = c << via
c1.xmax = heater.xmin
c1.y = heater.y
c2.xmin = heater.xmax
c2.y = heater.y
c.add_ports(disk_instance.get_ports_list())
c.add_ports(c1.get_ports_list(orientation=port_orientation), prefix="e1")
c.add_ports(c2.get_ports_list(orientation=port_orientation), prefix="e2")
c.auto_rename_ports()
return c
if __name__ == "__main__":
# c = disk_heater(wrap_angle_deg=75)
c = disk()
c.show(show_ports=True)
