def crossing_arm(
width: float = 0.5,
r1: float = 3.0,
r2: float = 1.1,
w: float = 1.2,
L: float = 3.4,
) -> Component:
"""arm of a crossing"""
c = Component()
_ellipse = ellipse(radii=(r1, r2), layer=LAYER.SLAB150).ref()
c.add(_ellipse)
c.absorb(_ellipse)
a = np.round(L + w / 2, 3)
h = width / 2
taper_pts = [
(-a, h),
(-w / 2, w / 2),
(w / 2, w / 2),
(a, h),
(a, -h),
(w / 2, -w / 2),
(-w / 2, -w / 2),
(-a, -h),
]
c.add_polygon(taper_pts, layer=LAYER.WG)
c.add_port(
name="o1", midpoint=(-a, 0), orientation=180, width=width, layer=LAYER.WG
)
c.add_port(name="o2", midpoint=(a, 0), orientation=0, width=width, layer=LAYER.WG)
return c
def coupler90bend(
radius: float = 10.0,
gap: float = 0.2,
bend: ComponentFactory = bend_euler,
cross_section_inner: CrossSectionFactory = strip,
cross_section_outer: CrossSectionFactory = strip,
) -> Component:
r"""Returns 2 coupled bends.
Args:
radius: um
gap: um
bend: for bend
cross_section_inner:
cross_section_outer:
.. code::
r 3 4
| | |
| / /
| / /
2____/ /
1_____/
"""
c = Component()
xi = cross_section_inner()
xo = cross_section_outer()
width = xo.info["width"] / 2 + xi.info["width"] / 2
spacing = gap + width
bend90_inner = bend(radius=radius, cross_section=cross_section_inner)
bend90_outer = bend(radius=radius + spacing,
cross_section=cross_section_outer)
bend_inner_ref = c << bend90_inner
bend_outer_ref = c << bend90_outer
pbw = bend_inner_ref.ports["o1"]
bend_inner_ref.movey(pbw.midpoint[1] + spacing)
# This component is a leaf cell => using absorb
c.absorb(bend_outer_ref)
c.absorb(bend_inner_ref)
c.add_port("o1", port=bend_outer_ref.ports["o1"])
c.add_port("o2", port=bend_inner_ref.ports["o1"])
c.add_port("o3", port=bend_inner_ref.ports["o2"])
c.add_port("o4", port=bend_outer_ref.ports["o2"])
return c
def bend_circular(angle: int = 90,
npoints: int = 720,
with_cladding_box: bool = True,
cross_section: CrossSectionOrFactory = strip,
**kwargs) -> Component:
"""Returns a radial arc.
Args:
angle: angle of arc (degrees)
npoints: number of points
with_cladding_box: square in layers_cladding to remove DRC
cross_section:
kwargs: cross_section settings
.. code::
o2
|
/
/
/
o1_____/
"""
x = cross_section(**kwargs) if callable(cross_section) else cross_section
radius = x.info["radius"]
p = arc(radius=radius, angle=angle, npoints=npoints)
c = Component()
path = extrude(p, x)
ref = c << path
c.add_ports(ref.ports)
c.info.length = snap_to_grid(p.length())
c.info.dy = float(abs(p.points[0][0] - p.points[-1][0]))
c.info.radius = float(radius)
if with_cladding_box and x.info["layers_cladding"]:
layers_cladding = x.info["layers_cladding"]
cladding_offset = x.info["cladding_offset"]
top = cladding_offset if angle == 180 else 0
points = get_padding_points(
component=c,
default=0,
bottom=cladding_offset,
right=cladding_offset,
top=top,
)
for layer in layers_cladding or []:
c.add_polygon(points, layer=layer)
c.absorb(ref)
return c
def coupler90(gap: float = 0.2,
radius: float = 10.0,
bend: ComponentFactory = bend_euler,
cross_section: CrossSectionFactory = strip,
**kwargs) -> Component:
r"""straight coupled to a bend.
Args:
gap: um
radius: um
straight: for straight
bend: for bend
cross_section:
kwargs: cross_section settings
.. code::
3
|
/
/
2_/
1____4
"""
c = Component()
x = cross_section(radius=radius, **kwargs)
bend90 = (bend(cross_section=cross_section, radius=radius, **kwargs)
if callable(bend) else bend)
bend_ref = c << bend90
straight_component = (straight(
cross_section=cross_section,
length=bend90.ports["o2"].midpoint[0] - bend90.ports["o1"].midpoint[0],
**kwargs) if callable(straight) else straight)
wg_ref = c << straight_component
width = x.info["width"]
pbw = bend_ref.ports["o1"]
bend_ref.movey(pbw.midpoint[1] + gap + width)
c.absorb(wg_ref)
c.absorb(bend_ref)
c.add_port("o1", port=wg_ref.ports["o1"])
c.add_port("o4", port=wg_ref.ports["o2"])
c.add_port("o2", port=bend_ref.ports["o1"])
c.add_port("o3", port=bend_ref.ports["o2"])
return c
def crossing_from_taper(taper=lambda: taper(width2=2.5, length=3.0)):
"""
Crossing based on a taper. The default is a dummy taper
"""
taper = taper() if callable(taper) else taper
c = Component()
for i, a in enumerate([0, 90, 180, 270]):
_taper = taper.ref(position=(0, 0), port_id="o2", rotation=a)
c.add(_taper)
c.add_port(name=i, port=_taper.ports["o1"])
c.absorb(_taper)
c.auto_rename_ports()
return c
def crossing(arm: ComponentFactory = crossing_arm) -> Component:
"""Waveguide crossing"""
cx = Component()
arm = arm() if callable(arm) else arm
arm_h = arm.ref()
arm_v = arm.ref(rotation=90)
port_id = 0
for c in [arm_h, arm_v]:
cx.add(c)
cx.absorb(c)
for p in c.ports.values():
cx.add_port(name=port_id, port=p)
port_id += 1
cx.auto_rename_ports()
return cx
def loop_mirror(component: ComponentFactory = mmi1x2,
bend90: ComponentFactory = bend_euler) -> Component:
"""Returns Sagnac loop_mirror."""
c = Component()
component = gf.call_if_func(component)
bend90 = gf.call_if_func(bend90)
cref = c.add_ref(component)
routes = route_manhattan(
cref.ports["o3"],
cref.ports["o2"],
straight=gf.components.straight,
bend=bend90,
)
c.add(routes.references)
c.add_port(name="o1", port=cref.ports["o1"])
c.absorb(cref)
return c
def cdsem_straight_density(
width: float = 0.372,
trench_width: float = 0.304,
x: float = LINE_LENGTH,
y: float = 50.0,
margin: float = 2.0,
label: str = "",
straight: ComponentFactory = straight,
layer: Tuple[int, int] = LAYER.WG,
layers_cladding: Optional[Tuple[Layer, ...]] = None,
cross_section: CrossSectionFactory = strip,
pixel_size: float = 1.0,
) -> Component:
"""Horizontal grating etch lines
Args:
width: width
trench_width: trench_width
"""
c = Component()
period = width + trench_width
n_o_lines = int((y - 2 * margin) / period)
length = x - 2 * margin
cross_section = partial(cross_section, width=width, layer=layer)
tooth = straight(length=length, cross_section=cross_section)
for i in range(n_o_lines):
tooth_ref = c.add_ref(tooth)
tooth_ref.movey((-n_o_lines / 2 + 0.5 + i) * period)
c.absorb(tooth_ref)
marker_label = manhattan_text(
text=f"{label}",
size=pixel_size,
layer=layer,
)
_marker_label = c.add_ref(marker_label)
_marker_label.move((length + 3, 10.0))
c.absorb(_marker_label)
return c
def add_frame(
component: Component = rectangle,
width: float = 10.0,
spacing: float = 10.0,
layer: Layer = (1, 0),
) -> Component:
"""Returns component with a frame around it.
Args:
component: Component to frame
width: of the frame
spacing: of component to frame
"""
c = Component()
component = component() if callable(component) else component
cref = c.add_ref(component)
cref.move(-c.size_info.center)
y = (
max([component.size_info.height, component.size_info.width]) / 2
+ spacing
+ width / 2
)
x = y
w = width
rh = rectangle(size=(2 * y + w, w), layer=layer, centered=True)
rtop = c.add_ref(rh)
rbot = c.add_ref(rh)
rtop.movey(+y)
rbot.movey(-y)
rv = rectangle(size=(w, 2 * y), layer=layer, centered=True)
rl = c.add_ref(rv)
rr = c.add_ref(rv)
rl.movex(-x)
rr.movex(+x)
c.absorb(cref)
return c
def straight(length: float = 10.0,
npoints: int = 2,
with_cladding_box: bool = True,
cross_section: CrossSectionOrFactory = strip,
**kwargs) -> Component:
"""Returns a Straight waveguide.
Args:
length: straight length
npoints: number of points
with_cladding_box: box in layers_cladding to avoid DRC sharp edges
cross_section:
**kwargs: cross_section settings
"""
p = gf.path.straight(length=length, npoints=npoints)
x = cross_section(**kwargs) if callable(cross_section) else cross_section
c = Component()
path = gf.path.extrude(p, x)
ref = c << path
c.add_ports(ref.ports)
c.info.length = gf.snap.snap_to_grid(length)
c.info.width = float(x.info["width"])
if length > 0 and with_cladding_box and x.info["layers_cladding"]:
layers_cladding = x.info["layers_cladding"]
cladding_offset = x.info["cladding_offset"]
points = get_padding_points(
component=c,
default=0,
bottom=cladding_offset,
top=cladding_offset,
)
for layer in layers_cladding or []:
c.add_polygon(points, layer=layer)
c.absorb(ref)
return c
def rectangle_with_slits(
size: Tuple[float, float] = (100.0, 200.0),
layer: Layer = (1, 0),
layer_slit: Optional[Layer] = (2, 0),
centered: bool = False,
port_type: Optional[str] = None,
slit_size: Tuple[float, float] = (1.0, 1.0),
slit_spacing: Float2 = (20, 20),
slit_enclosure: float = 10,
) -> Component:
"""Returns a rectangle with slits. Metal slits reduce stress.
Args:
size: (tuple) Width and height of rectangle.
layer: Specific layer to put polygon geometry on.
layer_slit: does a boolan NOT when None.
centered: True sets center to (0, 0), False sets south-west to (0, 0)
port_type: for the rectangle
slit_size: x, y slit size
slit_spacing: pitch_x, pitch_y for slits
slit_enclosure: from slit to rectangle edge
.. code::
slit_enclosure
_____________________________________
|<---> |
| |
| ______________________ |
| | | |
| | | slit_size[1]
| |______________________| |
| | |
| | slit_spacing |
| | | size[1]
| | ______________________ |
| | | | |
| | | | |
| | |______________________| |
| <---------------------> |
| slit_size[0] |
|___________________________________|
size[0]
"""
c = Component()
r = rectangle(size=size,
layer=layer,
port_type=port_type,
centered=centered)
c.add_ports(r.ports)
slit = rectangle(size=slit_size, port_type=None, layer=layer_slit or layer)
columns = np.floor((size[0] - 2 * slit_enclosure) / slit_spacing[0])
rows = np.floor((size[1] - 2 * slit_enclosure) / slit_spacing[1])
slits = array(slit, columns=columns, rows=rows, spacing=slit_spacing).ref()
slits.xmin = slit_enclosure
slits.ymin = slit_enclosure
if layer_slit:
c << r
c.add(slits)
else:
r_with_slits = c << gf.geometry.boolean(
r, slits, operation="not", layer=layer)
c.absorb(r_with_slits)
return c
def coupler_asymmetric(
bend: ComponentFactory = bend_s,
straight: ComponentFactory = straight_function,
gap: float = 0.234,
dy: float = 5.0,
dx: float = 10.0,
cross_section: CrossSectionFactory = strip,
**kwargs
) -> Component:
"""bend coupled to straight waveguide
Args:
bend:
straight: straight library
gap: um
dy: port to port vertical spacing
dx: bend length in x direction
cross_section:
**kwargs: cross_section settings
.. code::
dx
|-----|
_____ o2
/ |
_____/ |
gap o1____________ | dy
o3
"""
x = cross_section(**kwargs)
width = x.info["width"]
bend_component = (
bend(size=(dx, dy - gap - width), cross_section=cross_section, **kwargs)
if callable(bend)
else bend
)
wg = (
straight(cross_section=cross_section, **kwargs)
if callable(straight)
else straight
)
w = bend_component.ports["o1"].width
y = (w + gap) / 2
c = Component()
wg = wg.ref(position=(0, y), port_id="o1")
bottom_bend = bend_component.ref(position=(0, -y), port_id="o1", v_mirror=True)
c.add(wg)
c.add(bottom_bend)
# Using absorb here to have a flat cell and avoid
# to have deeper hierarchy than needed
c.absorb(wg)
c.absorb(bottom_bend)
port_width = 2 * w + gap
c.add_port(name="o1", midpoint=[0, 0], width=port_width, orientation=180)
c.add_port(port=bottom_bend.ports["o2"], name="o3")
c.add_port(port=wg.ports["o2"], name="o2")
return c
def resistance_meander(
num_squares: int = 1000,
width: float = 1.0,
layer: Tuple[int, int] = LAYER.M3,
pad: ComponentFactory = pad80,
) -> Component:
"""meander to test resistance
from phidl.geometry
FIXME, add pad_pitch
Args:
pad_size: Size of the two matched impedance pads (microns)
num_squares: Number of squares comprising the resonator wire
width: The width of the squares (microns)
layer:
pad: function for pad
"""
pad = pad()
pad_size = pad.info.size
x = pad_size[0]
z = pad_size[1]
# Checking validity of input
if x <= 0 or z <= 0:
raise ValueError("Pad must have positive, real dimensions")
elif width > z:
raise ValueError("Width of cell cannot be greater than height of pad")
elif num_squares <= 0:
raise ValueError("Number of squares must be a positive real number")
elif width <= 0:
raise ValueError("Width of cell must be a positive real number")
# Performing preliminary calculations
num_rows = int(np.floor(z / (2 * width)))
if num_rows % 2 == 0:
num_rows -= 1
num_columns = num_rows - 1
squares_in_row = (num_squares - num_columns - 2) / num_rows
# Compensating for weird edge cases
if squares_in_row < 1:
num_rows = round(num_rows / 2) - 2
squares_in_row = 1
if width * 2 > z:
num_rows = 1
squares_in_row = num_squares - 2
length_row = squares_in_row * width
# Creating row/column corner combination structure
T = Component()
Row = pc.rectangle(size=(length_row, width), layer=layer, port_type=None)
Col = pc.rectangle(size=(width, width), layer=layer, port_type=None)
T.add_ref(Row)
col = T.add_ref(Col)
col.move([length_row - width, -width])
# Creating entire straight net
N = Component("net")
n = 1
for i in range(num_rows):
if i != num_rows - 1:
d = N.add_ref(T)
else:
d = N.add_ref(Row)
if n % 2 == 0:
d.reflect(p1=(d.x, d.ymax), p2=(d.x, d.ymin))
d.movey(-(n - 1) * T.ysize)
n += 1
d = N.add_ref(Col).movex(-width)
d = N.add_ref(Col).move([length_row, -(n - 2) * T.ysize])
# Creating pads
P = Component()
pad1 = P.add_ref(pad)
pad1.movex(-x - width)
pad2 = P.add_ref(pad)
pad2.movex(length_row + width)
pad1.xmax = 0
pad2.xmin = z
net = P.add_ref(N)
net.y = pad1.y
P.absorb(net)
P.absorb(pad1)
P.absorb(pad2)
return P
def coupler_ring(
gap: float = 0.2,
radius: float = 5.0,
length_x: float = 4.0,
coupler90: ComponentFactory = coupler90function,
bend: Optional[ComponentFactory] = None,
coupler_straight: ComponentFactory = coupler_straight_function,
cross_section: CrossSectionFactory = strip,
**kwargs) -> Component:
r"""Coupler for ring.
Args:
gap: spacing between parallel coupled straight waveguides.
radius: of the bends.
length_x: length of the parallel coupled straight waveguides.
coupler90: straight coupled to a 90deg bend.
straight: library for straight waveguides.
bend: library for bend
coupler_straight: two parallel coupled straight waveguides.
cross_section:
**kwargs: cross_section settings
.. code::
2 3
| |
\ /
\ /
---=========---
1 length_x 4
"""
bend = bend or bend_euler
c = Component()
assert_on_2nm_grid(gap)
# define subcells
coupler90_component = (coupler90(gap=gap,
radius=radius,
bend=bend,
cross_section=cross_section,
**kwargs)
if callable(coupler90) else coupler90)
coupler_straight_component = (coupler_straight(
gap=gap, length=length_x, cross_section=cross_section, **
kwargs) if callable(coupler_straight) else coupler_straight)
# add references to subcells
cbl = c << coupler90_component
cbr = c << coupler90_component
cs = c << coupler_straight_component
# connect references
y = coupler90_component.y
cs.connect(port="o4", destination=cbr.ports["o1"])
cbl.reflect(p1=(0, y), p2=(1, y))
cbl.connect(port="o2", destination=cs.ports["o2"])
c.absorb(cbl)
c.absorb(cbr)
c.absorb(cs)
c.add_port("o1", port=cbl.ports["o3"])
c.add_port("o2", port=cbl.ports["o4"])
c.add_port("o3", port=cbr.ports["o3"])
c.add_port("o4", port=cbr.ports["o4"])
c.auto_rename_ports()
return c
def coupler_symmetric(
bend: ComponentFactory = bend_s,
gap: float = 0.234,
dy: float = 5.0,
dx: float = 10.0,
cross_section: CrossSectionFactory = strip,
**kwargs,
) -> Component:
r"""Two coupled straights with bends.
Args:
bend: bend or library
gap:
dy: port to port vertical spacing
dx: bend length in x direction
cross_section:
**kwargs: cross_section settings
.. code::
dx
|-----|
___ E1
/ |
_____/ |
gap _____ | dy
\ |
\___ |
E0
"""
x = cross_section(**kwargs)
width = x.info["width"]
bend_component = (
bend(
size=(dx, (dy - gap - width) / 2),
cross_section=cross_section,
**kwargs,
)
if callable(bend)
else bend
)
w = bend_component.ports["o1"].width
y = (w + gap) / 2
c = Component()
top_bend = bend_component.ref(position=(0, y), port_id="o1")
bottom_bend = bend_component.ref(position=(0, -y), port_id="o1", v_mirror=True)
c.add(top_bend)
c.add(bottom_bend)
c.absorb(top_bend)
c.absorb(bottom_bend)
c.add_port("o1", port=bottom_bend.ports["o1"])
c.add_port("o2", port=top_bend.ports["o1"])
c.add_port("o3", port=top_bend.ports["o2"])
c.add_port("o4", port=bottom_bend.ports["o2"])
c.info.length = bend_component.info.length
c.info.min_bend_radius = bend_component.info.min_bend_radius
return c
def mmi1x2(width: float = 0.5,
width_taper: float = 1.0,
length_taper: float = 10.0,
length_mmi: float = 5.5,
width_mmi: float = 2.5,
gap_mmi: float = 0.25,
taper: ComponentFactory = taper_function,
with_cladding_box: bool = True,
cross_section: CrossSectionFactory = strip,
**kwargs) -> Component:
r"""Mmi 1x2.
Args:
width: input and output straight width
width_taper: interface between input straights and mmi region
length_taper: into the mmi region
length_mmi: in x direction
width_mmi: in y direction
gap_mmi: gap between tapered wg
taper: taper function
with_cladding_box: to avoid DRC acute angle errors in cladding
cross_section:
**kwargs: cross_section settings
.. code::
length_mmi
<------>
________
| |
| \__
| __ E1
__/ /_ _ _ _
W0 __ | _ _ _ _| gap_mmi
\ \__
| __ E0
| /
|________|
<->
length_taper
"""
gf.snap.assert_on_2nm_grid(gap_mmi)
x = cross_section(**kwargs)
cladding_offset = x.info["cladding_offset"]
layers_cladding = x.info["layers_cladding"]
layer = x.info["layer"]
c = Component()
w_mmi = width_mmi
w_taper = width_taper
taper = taper(length=length_taper,
width1=width,
width2=w_taper,
cross_section=cross_section,
**kwargs)
a = gap_mmi / 2 + width_taper / 2
mmi = c << gf.components.rectangle(
size=(length_mmi, w_mmi),
layer=layer,
centered=True,
)
ports = [
gf.Port("o1",
orientation=180,
midpoint=(-length_mmi / 2, 0),
width=w_taper),
gf.Port("o2",
orientation=0,
midpoint=(+length_mmi / 2, +a),
width=w_taper),
gf.Port("o3",
orientation=0,
midpoint=(+length_mmi / 2, -a),
width=w_taper),
]
for port in ports:
taper_ref = c << taper
taper_ref.connect(port="o2", destination=port)
c.add_port(name=port.name, port=taper_ref.ports["o1"])
c.absorb(taper_ref)
c.absorb(mmi)
layers_cladding = layers_cladding or []
if layers_cladding and with_cladding_box:
add_padding(
c,
default=cladding_offset,
right=0,
left=0,
top=cladding_offset,
bottom=cladding_offset,
layers=layers_cladding,
)
return c
def crossing45(
crossing: ComponentFactory = crossing,
port_spacing: float = 40.0,
dx: Optional[float] = None,
alpha: float = 0.08,
npoints: int = 101,
) -> Component:
r"""Returns 45deg crossing with bends.
Args:
crossing: crossing function
port_spacing: target I/O port spacing
dx: target length
alpha: optimization parameter. diminish it for tight bends,
increase it if raises assertion angle errors
npoints: number of points.
Implementation note: The 45 Degree crossing CANNOT be kept as an SRef since
we only allow for multiples of 90Deg rotations in SRef
.. code::
---- ----
\ /
X
/ \
--- ----
"""
crossing = crossing() if callable(crossing) else crossing
c = Component()
_crossing = crossing.ref(rotation=45)
c.add(_crossing)
# Add bends
p_e = _crossing.ports["o3"].midpoint
p_w = _crossing.ports["o1"].midpoint
p_n = _crossing.ports["o2"].midpoint
p_s = _crossing.ports["o4"].midpoint
# Flatten the crossing - not an SRef anymore
c.absorb(_crossing)
dx = dx or port_spacing
dy = port_spacing / 2
start_angle = 45
end_angle = 0
cpts = find_min_curv_bezier_control_points(
start_point=p_e,
end_point=(dx, dy),
start_angle=start_angle,
end_angle=end_angle,
npoints=npoints,
alpha=alpha,
)
bend = bezier(
control_points=cpts,
start_angle=start_angle,
end_angle=end_angle,
npoints=npoints,
)
tol = 1e-2
assert abs(bend.info["start_angle"] -
start_angle) < tol, bend.info["start_angle"]
assert abs(bend.info["end_angle"] -
end_angle) < tol, bend.info["end_angle"]
b_tr = bend.ref(position=p_e, port_id="o1")
b_tl = bend.ref(position=p_n, port_id="o1", h_mirror=True)
b_bl = bend.ref(position=p_w, port_id="o1", rotation=180)
b_br = bend.ref(position=p_s, port_id="o1", v_mirror=True)
for cmp_ref in [b_tr, b_br, b_tl, b_bl]:
# cmp_ref = _cmp.ref()
c.add(cmp_ref)
c.absorb(cmp_ref)
c.info.bezier_length = bend.info.length
c.info.crossing = crossing.info
c.info.min_bend_radius = b_br.info.min_bend_radius
c.bezier = bend
c.crossing = crossing
c.add_port("o1", port=b_br.ports["o2"])
c.add_port("o2", port=b_tr.ports["o2"])
c.add_port("o3", port=b_bl.ports["o2"])
c.add_port("o4", port=b_tl.ports["o2"])
c.snap_ports_to_grid()
c.auto_rename_ports()
return c
def crossing_etched(
width: float = 0.5,
r1: float = 3.0,
r2: float = 1.1,
w: float = 1.2,
L: float = 3.4,
layer_wg: Layer = LAYER.WG,
layer_slab: Layer = LAYER.SLAB150,
):
"""
Waveguide crossing:
- The full crossing has to be on WG layer (to start with a 220nm slab)
- Then we etch the ellipses down to 150nm slabs and we keep linear taper at 220nm.
What we write is what we etch on this step
"""
# Draw the ellipses
c = Component()
_ellipse1 = c << ellipse(radii=(r1, r2), layer=layer_wg)
_ellipse2 = c << ellipse(radii=(r2, r1), layer=layer_wg)
c.absorb(_ellipse1)
c.absorb(_ellipse2)
a = L + w / 2
h = width / 2
taper_cross_pts = [
(-a, h),
(-w / 2, w / 2),
(-h, a),
(h, a),
(w / 2, w / 2),
(a, h),
(a, -h),
(w / 2, -w / 2),
(h, -a),
(-h, -a),
(-w / 2, -w / 2),
(-a, -h),
]
c.add_polygon(taper_cross_pts, layer=layer_wg)
# tapers_poly = c.add_polygon(taper_cross_pts, layer=layer_wg)
# b = a - 0.1 # To make sure we get 4 distinct polygons when doing bool ops
# tmp_polygon = [(-b, b), (b, b), (b, -b), (-b, -b)]
# polys_etch = gdspy.fast_boolean([tmp_polygon], tapers_poly, "not", layer=layer_slab)
# c.add(polys_etch)
positions = [(a, 0), (0, a), (-a, 0), (0, -a)]
angles = [0, 90, 180, 270]
i = 0
for p, angle in zip(positions, angles):
c.add_port(
name=str(i),
midpoint=p,
orientation=angle,
width=width,
layer=layer_wg,
)
i += 1
c.auto_rename_ports()
return c
def coupler(gap: float = 0.236,
length: float = 20.0,
coupler_symmetric: ComponentFactory = coupler_symmetric_function,
coupler_straight: ComponentFactory = coupler_straight_function,
dy: float = 5.0,
dx: float = 10.0,
cross_section: CrossSectionFactory = strip,
**kwargs) -> Component:
r"""Symmetric coupler.
Args:
gap: between straights
length: of coupling region
coupler_symmetric
coupler_straight
dy: port to port vertical spacing
dx: length of bend in x direction
cross_section: factory
kwargs: cross_section settings
.. code::
dx dx
|------| |------|
o2 ________ ______o3
\ / |
\ length / |
======================= gap | dy
/ \ |
________/ \_______ |
o1 o4
coupler_straight coupler_symmetric
"""
length = snap_to_grid(length)
assert_on_2nm_grid(gap)
c = Component()
sbend = coupler_symmetric(gap=gap,
dy=dy,
dx=dx,
cross_section=cross_section,
**kwargs)
sr = c << sbend
sl = c << sbend
cs = c << coupler_straight(
length=length, gap=gap, cross_section=cross_section, **kwargs)
sl.connect("o2", destination=cs.ports["o1"])
sr.connect("o1", destination=cs.ports["o4"])
c.add_port("o1", port=sl.ports["o3"])
c.add_port("o2", port=sl.ports["o4"])
c.add_port("o3", port=sr.ports["o3"])
c.add_port("o4", port=sr.ports["o4"])
c.absorb(sl)
c.absorb(sr)
c.absorb(cs)
c.info.length = sbend.info.length
c.info.min_bend_radius = sbend.info.min_bend_radius
c.auto_rename_ports()
return c
def bend_euler(angle: int = 90,
p: float = 0.5,
with_arc_floorplan: bool = True,
npoints: int = 720,
direction: str = "ccw",
with_cladding_box: bool = True,
cross_section: CrossSectionOrFactory = strip,
**kwargs) -> Component:
"""Returns an euler bend that adiabatically transitions from straight to curved.
By default, `radius` corresponds to the minimum radius of curvature of the bend.
However, if `with_arc_floorplan` is True, `radius` corresponds to the effective
radius of curvature (making the curve a drop-in replacement for an arc). If
p < 1.0, will create a "partial euler" curve as described in Vogelbacher et.
al. https://dx.doi.org/10.1364/oe.27.031394
default p = 0.5 based on this paper
https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-25-8-9150&id=362937
Args:
angle: total angle of the curve
p: Proportion of the curve that is an Euler curve
with_arc_floorplan: If False: `radius` is the minimum radius of curvature
If True: The curve scales such that the endpoints match a bend_circular
with parameters `radius` and `angle`
npoints: Number of points used per 360 degrees
direction: cw (clock-wise) or ccw (counter clock-wise)
with_cladding_box: to avoid DRC acute angle errors in cladding
cross_section:
kwargs: cross_section settings
.. code::
o2
|
/
/
/
o1_____/
"""
x = cross_section(**kwargs) if callable(cross_section) else cross_section
radius = x.info["radius"]
c = Component()
p = euler(radius=radius,
angle=angle,
p=p,
use_eff=with_arc_floorplan,
npoints=npoints)
ref = c << extrude(p, x)
c.add_ports(ref.ports)
c.info.length = snap_to_grid(p.length())
c.info.dy = abs(float(p.points[0][0] - p.points[-1][0]))
c.info.radius_min = float(snap_to_grid(p.info["Rmin"]))
c.info.radius = float(radius)
if with_cladding_box and x.info["layers_cladding"]:
layers_cladding = x.info["layers_cladding"]
cladding_offset = x.info["cladding_offset"]
top = cladding_offset if angle == 180 else 0
points = get_padding_points(
component=c,
default=0,
bottom=cladding_offset,
right=cladding_offset,
top=top,
)
for layer in layers_cladding or []:
c.add_polygon(points, layer=layer)
if direction == "cw":
ref.mirror(p1=[0, 0], p2=[1, 0])
c.absorb(ref)
return c
def resistance_meander(
pad_size: Tuple[float] = (50.0, 50.0),
num_squares: int = 1000,
width: float = 1.0,
res_layer: Tuple[int, int] = LAYER.M3,
pad_layer: Tuple[int, int] = LAYER.M3,
gnd_layer: Tuple[int, int] = LAYER.M3,
) -> Component:
"""meander to test resistance
from phidl.geometry
Args:
pad_size: Size of the two matched impedance pads (microns)
num_squares: Number of squares comprising the resonator wire
width: The width of the squares (microns)
res_layer:
pad_layer:
gnd_layer:
"""
x = pad_size[0]
z = pad_size[1]
# Checking validity of input
if x <= 0 or z <= 0:
raise ValueError("Pad must have positive, real dimensions")
elif width > z:
raise ValueError("Width of cell cannot be greater than height of pad")
elif num_squares <= 0:
raise ValueError("Number of squares must be a positive real number")
elif width <= 0:
raise ValueError("Width of cell must be a positive real number")
# Performing preliminary calculations
num_rows = int(np.floor(z / (2 * width)))
if num_rows % 2 == 0:
num_rows -= 1
num_columns = num_rows - 1
squares_in_row = (num_squares - num_columns - 2) / num_rows
# Compensating for weird edge cases
if squares_in_row < 1:
num_rows = round(num_rows / 2) - 2
squares_in_row = 1
if width * 2 > z:
num_rows = 1
squares_in_row = num_squares - 2
length_row = squares_in_row * width
# Creating row/column corner combination structure
T = Component()
Row = pc.rectangle(size=(length_row, width), layer=res_layer)
Col = pc.rectangle(size=(width, width), layer=res_layer)
T.add_ref(Row)
col = T.add_ref(Col)
col.move([length_row - width, -width])
# Creating entire straight net
N = Component("net")
n = 1
for i in range(num_rows):
if i != num_rows - 1:
d = N.add_ref(T)
else:
d = N.add_ref(Row)
if n % 2 == 0:
d.reflect(p1=(d.x, d.ymax), p2=(d.x, d.ymin))
d.movey(-(n - 1) * T.ysize)
n += 1
d = N.add_ref(Col).movex(-width)
d = N.add_ref(Col).move([length_row, -(n - 2) * T.ysize])
# Creating pads
P = Component()
pad1 = pc.rectangle(size=(x, z), layer=pad_layer)
pad2 = pc.rectangle(size=(x + 5, z), layer=pad_layer)
gnd1 = offset(pad1, distance=-5, layer=gnd_layer)
gnd2 = offset(pad2, distance=-5, layer=gnd_layer)
pad1_ref = P.add_ref(pad1)
pad1_ref.movex(-x - width)
pad2_ref = P.add_ref(pad1)
pad2_ref.movex(length_row + width)
gnd1_ref = P.add_ref(gnd1)
gnd1_ref.center = pad1_ref.center
gnd2_ref = P.add_ref(gnd2)
net = P.add_ref(N)
net.y = pad1_ref.y
gnd2_ref.center = pad2_ref.center
gnd2_ref.movex(2.5)
P.absorb(net)
P.absorb(gnd1_ref)
P.absorb(gnd2_ref)
P.absorb(pad1_ref)
P.absorb(pad2_ref)
return P
