class picazzo3.wg.spirals.cell.DoubleSpiralRounded(*args, **kwargs)
Rounded double spiral class with both access waveguides on the outside of the spiral. 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.


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

shapes: list

List of shapes used to build the traces


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

The name of the view

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.

spiral_center: Coord2

locatation of the center of the spiral.

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.

Other Parameters:

auto_transform: locked


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

cell = DoubleSpiralRounded(n_o_loops=2, trace_template=i3.TECH.PCELLS.WG.DEFAULT)
layout = cell.Layout(inner_size=(15.0, 15.0),
                     stub_direction="H",  # either H or V
                     spiral_center=(0, 0))