class picazzo3.wg.spirals.cell.DoubleSpiralWithInCouplingRounded(*args, **kwargs)

Rounded double spiral class with both access waveguides on the outside of the spiral. In coupling waveguides are added to the spiral, one at the east side and one at the west side. The trace template provided in the property trace_template is used to build a chain of waveguides. All the rounding properties can be set at the layout level.


n_o_loops: int and number > 0

Number of loops in the spiral

trace_template: PCell and _TraceTemplate

Trace template used in the chain.


The unique name of the pcell

Other Parameters:

traces: List with type restriction, allowed types: <class ‘ipkiss3.pcell.cell.pcell.PCell’>, locked

n_o_traces: int and number > 0, locked

Total number of traces used in the spiral.



angle_step: float and number > 0

Angle step for rounding.

manhattan: ( bool, bool_, bool or int )

Adds rectangular blocks in the bends to avoid as much as possible non-manhattan angles.

shapes: list

List of shapes used to build the traces


view_name: str and ( Alphanumeric string or Contains _$ )

The name of the view

incoupling_length: float and Real, number and number >= 0

length of the incoupling section.

inner_size: Coord2

Inner size of the the spiral, defaults to 3 * spacing + 2 * bend_radius, in each direction

spacing: float and Real, number and number >= 0

spacing between the individual loops.

flatten: ( bool, bool_, bool or int )

If true the instances are flattened

bend_radius: float and number > 0

Bend radius for the auto-generated bends.


Rounding algorithm used to generate the bends. Can be circular, spline, ….

Other Parameters:

spiral_center: locked

auto_transform: locked


from technologies import silicon_photonics
from picazzo3.wg.spirals import DoubleSpiralWithInCouplingRounded
from ipkiss3 import all as i3

cell = DoubleSpiralWithInCouplingRounded(n_o_loops=3, trace_template=i3.TECH.PCELLS.WG.DEFAULT)
layout = cell.Layout(inner_size=(30.0, 30.0),