# This code is part of KQCircuits
# Copyright (C) 2021 IQM Finland Oy
#
# This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
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# version.
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# (meetiqm.com/developers/osstmpolicy). IQM welcomes contributions to the code. Please see our contribution agreements
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from kqcircuits.chips.chip import Chip
from kqcircuits.elements.waveguide_composite import WaveguideComposite, Node
from kqcircuits.pya_resolver import pya
from kqcircuits.util.parameters import Param, pdt, add_parameters_from
[docs]@add_parameters_from(Chip, frames_enabled=[0, 1])
class CrossingTwoface(Chip):
"""The PCell declaration for a CrossingTwoFace chip.
On the left side of the chip there is a straight vertical waveguide bottom face and a meandering waveguide crossing
multiple times on the top face. There are transmission lines at different faces at the crossings. On the right side
there is likewise a straight and a meandering waveguide, but they do not cross at any point.
"""
crossings = Param(pdt.TypeInt, "Number of double crossings", 3,
docstring="Number of pairs of flip-chip crossings")
crossing_length = Param(pdt.TypeDouble, "Crossing waveguide length", 400, unit="μm",
docstring="Length of the crossing on the top face (μm)")
cross_talk_distance = Param(pdt.TypeDouble, "Transmission line distance from meander", 300, unit="μm",
docstring="Distance between the right straight transmission line and meander on the right (μm)")
meander_face = Param(pdt.TypeString, "Meander face on right side", "single", choices=["Single", "Two Face"])
[docs] def build(self):
launchers = self.produce_launchers("SMA8",
launcher_assignments={
1: "PL-1-IN", 2: "PL-2-IN",
3: "PL-4-IN", 4: "PL-4-OUT",
5: "PL-2-OUT", 6: "PL-1-OUT",
7: "PL-3-OUT", 8: "PL-3-IN"
}
)
self._produce_transmission_lines(launchers)
def _produce_transmission_lines(self, launchers):
distance = 700
right_tr_x = 5000 + distance
left_tr_x = 5000 - distance
face1_box = self.get_box(1)
# Left transmission line
nodes = [Node(self.refpoints["PL-1-IN_port"]),
Node(self.refpoints["PL-1-IN_port_corner"] + pya.DPoint(0, - 2 * self.r)),
Node((left_tr_x, self.refpoints["PL-1-IN_port_corner"].y - 2 * self.r)),
Node((left_tr_x, face1_box.p2.y), a=self.a_capped, b=self.b_capped),
Node((left_tr_x, face1_box.p1.y + 100), a=self.a, b=self.b),
Node((left_tr_x, self.refpoints["PL-1-OUT_port_corner"].y + 2 * self.r)),
Node(self.refpoints["PL-1-OUT_port_corner"] + pya.DPoint(0, 2 * self.r)),
Node(self.refpoints["PL-1-OUT_port"])
]
self.insert_cell(WaveguideComposite, nodes=nodes)
# Right transmission line
nodes = [Node(self.refpoints["PL-2-IN_port"]),
Node(self.refpoints["PL-2-IN_port_corner"] + pya.DPoint(0, - 2 * self.r)),
Node((right_tr_x, self.refpoints["PL-2-IN_port_corner"].y - 2 * self.r)),
Node((right_tr_x, face1_box.p2.y),
a=self.a_capped, b=self.b_capped),
Node((right_tr_x, face1_box.p1.y + 100), a=self.a, b=self.b),
Node((right_tr_x, self.refpoints["PL-2-OUT_port_corner"].y + 2 * self.r)),
Node(self.refpoints["PL-2-OUT_port_corner"] + pya.DPoint(0, 2 * self.r)),
Node(self.refpoints["PL-2-OUT_port"])
]
self.insert_cell(WaveguideComposite, nodes=nodes)
# Crossing transmission line
nodes = [Node(self.refpoints["PL-3-IN_port"]),
Node((face1_box.p1.x, self.refpoints["PL-3-IN_port"].y),
a=self.a_capped, b=self.b_capped)]
ref_x = left_tr_x
ref_x_1 = ref_x - self.crossing_length / 2.
ref_x_2 = ref_x + self.crossing_length / 2.
last_y = launchers["PL-3-IN"][0].y
crossings = self.crossings # must be even
step = (launchers["PL-3-IN"][0].y - launchers["PL-3-OUT"][0].y) / (crossings - 0.5) / 2
wiggle = self.crossing_length / 2. + 250
for i in range(crossings):
nodes.append(Node((ref_x - wiggle, last_y)))
nodes.append(Node((ref_x_1, last_y), face_id=self.face_ids[1]))
nodes.append(Node((ref_x_2, last_y), face_id=self.face_ids[0]))
nodes.append(Node((ref_x + wiggle, last_y)))
last_y -= step
nodes.append(Node((ref_x + wiggle, last_y)))
nodes.append(Node((ref_x_2, last_y), face_id=self.face_ids[1]))
nodes.append(Node((ref_x_1, last_y), face_id=self.face_ids[0]))
nodes.append(Node((ref_x - wiggle, last_y)))
last_y -= step
nodes.append(Node((face1_box.p1.x + 100, self.refpoints["PL-3-OUT_port"].y), a=self.a, b=self.b))
nodes.append(Node(self.refpoints["PL-3-OUT_port_corner"]))
nodes.append(Node(self.refpoints["PL-3-OUT_port"]))
self.insert_cell(WaveguideComposite, nodes=nodes)
# cross_talk
ref_x = right_tr_x + self.cross_talk_distance + wiggle
last_y = self.refpoints["PL-4-IN_port"].y
nodes = [Node(self.refpoints["PL-4-IN_port"]),
Node(self.refpoints["PL-4-IN_port_corner"]),
Node((face1_box.p2.x, self.refpoints["PL-4-IN_port"].y),
a=self.a_capped, b=self.b_capped)]
for i in range(crossings):
if i == 0 and self.meander_face == "Two Face":
nodes.append(
Node((ref_x + wiggle, last_y), face_id=self.face_ids[1]))
else:
nodes.append(Node((ref_x + wiggle, last_y)))
nodes.append(Node((ref_x - wiggle, last_y)))
last_y -= step
nodes.append(Node((ref_x - wiggle, last_y)))
if i == range(crossings)[-1] and self.meander_face == "Two Face":
nodes.append(Node((ref_x + wiggle, last_y), face_id=self.face_ids[0]))
else:
nodes.append(Node((ref_x + wiggle, last_y)))
last_y -= step
nodes.append(Node((face1_box.p2.x - 100, self.refpoints["PL-4-OUT_port"].y),
a=self.a, b=self.b))
nodes.append(Node(self.refpoints["PL-4-OUT_port_corner"]))
nodes.append(Node(self.refpoints["PL-4-OUT_port"]))
self.insert_cell(WaveguideComposite, nodes=nodes)