WgParabolicCrossing

class picazzo3.wg.crossing.cell.WgParabolicCrossing

Highly efficient crossing for high-contrast silicon photonics. The crossing consists of double-etched parabolic transitions at right angles, collimating the optical field over a short distance to a parallel beam at the center of the crossing. This allows for a minimum of crosstalk. The details of this crossing are described in detail in [W. Bogaerts et al., Optics Letters, 32(19), p.2801-2803 (2007)]

Parameters:

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

the waveguides through the crossing

trace_template: PCell and _WaveguideTemplate

Trace template used to define the crossing

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

The unique name of the pcell

Views

class Layout

Parameters:

core_width: float and number > 0

width of the shallow waveguide etch at the ports. defaults to same value as deep waveguide

width_step: float and number > 0

discretisation in width for the parabolic shapes

core_cladding_purpose: PatternPurpose

pattern purpose for the shallow etched core cladding

cladding_purpose: PatternPurpose

pattern purpose for the full etched strip cladding

core_purpose: PatternPurpose

pattern purpose for the shallow etched core

strip_purpose: PatternPurpose

pattern purpose for the full etched strip

core_cladding_process: ProcessLayer

process for the shallow etched core cladding

cladding_process: ProcessLayer

process for the full etched strip cladding

core_process: ProcessLayer

process for the shallow etched core

strip_process: ProcessLayer

process for the full etched strip

core_cladding_width: float and number > 0

width of the cladding of the shallow etched core

core_width_center: float and number > 0

shallowetched core width at the center

strip_width_center: float and number > 0

full etched strip width at the center

straight_stub: float and number > 0

length of the straight sections of the crossing

length: float and number > 0

length of the parabolic section (from start to crossing center to the end)

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

Examples

import si_fab.all as pdk  # noqa: F401
from picazzo3.wg.crossing import WgParabolicCrossing

C = WgParabolicCrossing(name="my_parabolic_crossing")
layout = C.Layout(
    length=5.7, strip_width_center=2.6, core_width_center=0.8, core_cladding_width=2 * 0.5 + 0.8
)

layout.visualize(annotate=True)