案例分享：画微环调制器

全部代码如下：

from si_fab import all as pdk
from ipkiss3 import all as i3class DC(i3.PCell):straight_length = i3.PositiveNumberProperty(default=200)radius = i3.PositiveNumberProperty(default=50)spacing = i3.PositiveNumberProperty(default=1)straight_waveguide = i3.ChildCellProperty()arc_waveguide = i3.ChildCellProperty()trace_template = i3.TraceTemplateProperty(default=pdk.SWG450(), doc="The trace template for waveguide and heater")def _default_straight_waveguide(self):wg = i3.Waveguide(trace_template=self.trace_template)wg.Layout(shape=i3.Shape([(0, 0), (self.straight_length, 0)]))return wgdef _default_arc_waveguide(self):wg = i3.RoundedWaveguide(trace_template=self.trace_template)wg.Layout(shape=i3.ShapeArc(radius=self.radius, start_angle=0, start_face_angle=90, end_angle=180,end_face_angle=270))return wgclass Layout(i3.LayoutView):def _generate_instances(self, insts):insts += i3.place_and_route(insts={"wg1": self.straight_waveguide,"wg2": self.arc_waveguide,},specs=[i3.Place("wg1:in", (-self.straight_length / 2, 0)),])insts = i3.place_and_route(insts=insts,specs=[i3.PlaceRelative("wg2:out", "wg1:in",(self.straight_length / 2 - self.radius, -self.radius - self.spacing))])return instsdef _generate_ports(self, ports):ports += i3.expose_ports(instances=self.instances,port_name_map={"wg1:in": "in1","wg2:in": "out2","wg1:out": "out1","wg2:out": "in2",})return portsclass Netlist(i3.NetlistFromLayout):passclass Ring_modulator(i3.Circuit):_name_prefix = "Ring_modulator"dc = i3.ChildCellProperty()heater = i3.ChildCellProperty()radius = i3.PositiveNumberProperty(default=50)dc_distance = i3.PositiveNumberProperty(default=300)heater_length = i3.PositiveNumberProperty(default=100)trace_template = i3.TraceTemplateProperty(default=pdk.SWG450(), doc="The trace template for waveguide and heater")straight_length = i3.PositiveNumberProperty(default=200)spacing = i3.PositiveNumberProperty(default=0.8)# Set the default value for the heaterdef _default_dc(self):return DC(straight_length=self.straight_length,radius=self.radius,trace_template=self.trace_template,spacing=self.spacing)def _default_heater(self):ht = pdk.HeatedWaveguide(trace_template=self.trace_template)ht.Layout(shape=i3.Shape([(0, 0), (self.heater_length, 0)]))return htdef _default_insts(self):  # element naminginsts = {"heater1": self.heater,"heater2": self.heater,"dc1": self.dc,"dc2": self.dc,}return instsdef _default_specs(self):  # coordinatespecs = [i3.Place("dc1", (0.0, 0.0)),i3.PlaceRelative("dc2", "dc1", (0.0, -self.dc_distance)),i3.FlipV("dc2"),i3.Place("heater1", (-self.radius, -self.dc_distance / 2 - self.heater_length / 2), 90),i3.Place("heater2", (self.radius, -self.dc_distance / 2 - self.heater_length / 2), 90),i3.ConnectManhattan("dc1:in2", "heater1:out"),i3.ConnectManhattan("dc1:out2", "heater2:out"),i3.ConnectManhattan("dc2:in2", "heater1:in"),i3.ConnectManhattan("dc2:out2", "heater2:in"),]return specsdef _default_exposed_ports(self):  # port definitionexposed_ports = {"heater1:elec1": "elec1","heater1:elec2": "elec2","heater2:elec1": "elec3","heater2:elec2": "elec4","dc1:in1": "in1","dc2:in1": "in2","dc1:out1": "out1","dc2:out1": "out2",}return exposed_portsif __name__ == "__main__":Ring_modulator().Layout().visualize(annotate=True,legacy=True)