class picazzo3.wg.spirals.cell.SingleSpiralRounded

Rounded single spiral class going from the inside to the outside. 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.

name: String that contains only ISO/IEC 8859-1 (extended ASCII py3) or pure ASCII (py2) characters

The unique name of the pcell

Other Parameters
n_o_traces: int and number > 0, locked

Total number of traces used in the spiral.

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


class Layout
flatten: ( bool, bool_, bool or int )

If true the instances are flattened

shapes: list

List of shapes used to build the traces

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

spacing between the individual loops.

spiral_center: Coord2

location of the center of the spiral.

inner_size: Coord2 and number >= 0

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

view_name: String that contains only alphanumeric characters from the ASCII set or contains _$. ASCII set is extended on PY3.

The name of the view

manhattan: ( bool, bool_, bool or int )

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

angle_step: float and number > 0

Angle step for rounding.

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
auto_transform: locked


from technologies import silicon_photonics  # noqa: F401
from picazzo3.wg.spirals import SingleSpiralRounded
from ipkiss3 import all as i3

cell = SingleSpiralRounded(n_o_loops=5, trace_template=i3.TECH.PCELLS.WG.DEFAULT)
layout = cell.Layout(
    inner_size=(30.0, 30.0), bend_radius=3.0, manhattan=True, spacing=5.0, spiral_center=(2, 1)