class picazzo3.filters.ring.cell.RingRectSymm90DropFilter

Rectangular ring filter with two access waveguide. This component is often called a channel drop filter. The access waveguides are placed south and east of the Ring, at 90 degree angles. The shape of the bus waveguides mirrors the shape of the ring, which makes the coupling section symmetric.

The ring shape is a rounded rectangle of which the bend radius can be specified, as well as the horizontal and vertical straight sections. it is also possible to specify the rounding algorithm of the bends.

The waveguide template of the ring and the couplers can be chosen independently.

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

list of trace_templates for the ring couplers. By default the same template as the ring is taken

ring_trace_template: PCell and _WaveguideTemplate

Trace template for the ring waveguide

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

list of coupler PCells

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

list of Ring PCells

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

Trace templates for the ring segments. Locked, as there is only one segment in this Ring. Use ‘ring_trace_template’ instead.


class Layout
coupler_angles: list<[0,90]>
coupler_lengths: list<number >= 0>

straight lengths of the couplers. if None, same lengths as the ring will be used

coupler_offsets: list<Real, number>

list of offsets of the ring couplers along the centerline

coupler_radii: list<number >= 0>

radii of the couplers. if None, same radius as the ring will be used


rounding algorithm of the couplers. if None, same radius as the ring will be used

coupler_spacings: list<Real, number>

list of centerline-to-centerline spacings of the ring couplers.When negative, the ring and coupler waveguide will cross, which ispossible when the ring traces template and the coupler trace templateare on different process layers (vertical couplers)

coupler_straights: list<number >= 0>

lengths of the straigth sections at the start and end of the couplers

straights: Coord2 and number >= 0

Parameters for the couplers. This is a list of dicts, and the length of the list should be the same as the number of couplers

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

shape_position: Coord2

Translation of the shape.

area_layer_on: ( bool, bool_, bool or int )

When True, the Ring area will be covered by i3.Rectangles on all cover layers of the ring waveguide template.


list of coupler transformations

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
shape: locked
shapes: locked

Shapes of the ring segments. Locked, as there is only 1 ring segment. Use ‘shape’ instead


from technologies import silicon_photonics  # noqa: F401
from ipkiss3 import all as i3
from picazzo3.filters.ring import RingRectSymm90DropFilter

ring = RingRectSymm90DropFilter(name="my_rectsymm90dropring")
layout = ring.Layout(
    coupler_lengths=[1.0, 4.0],
    coupler_radii=[3.0, 5.0],
    coupler_angles=[90.0, 30.0],