RingRect180DropFilter

class picazzo3.filters.ring.cell.RingRect180DropFilter(*args, **kwargs)

Rectangular ring filter with two straight access waveguide. This component is often called a channel drop filter. The access waveguides are placed north and south of the Ring

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.

Parameters:

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

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

ring_trace_template: PCell and _WaveguideTemplate, optional

Trace template for the ring waveguide

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

list of coupler PCells

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

list of Ring PCells

cell_instances: _PCellInstanceDict, optional

name: optional

The unique name of the pcell

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.

Examples

""" This example illustrates the basic ring resonator model without creating a layout.

It also illustrates the effect of resonance peak splitting due to back-reflection in the coupler.
"""
from technologies import silicon_photonics
import ipkiss3.all as i3 # ipkiss
import pylab as plt, numpy as np #matplotlib and numpy

from picazzo3.filters.ring import RingRect180DropFilter

# To get a FSR of 10 nm at 1.55 um, we use the following formula
n_g = 2.86     # default value used in picazzo3, see TECH.PCELLS.WG.DEFAULT
L_fsr_10nm = (1.55**2 / (n_g * 0.01))

# 1. Define the ring
my_ring = RingRect180DropFilter(name="my_example_ring")

# coupler parameters
cp = dict(cross_coupling1=1j*0.0784**0.5,
          straight_coupling1=0.9216**0.5,
          reflection_in1=1j * 0.030, # The backreflection in the coupler
          )

my_ring_cm = my_ring.CircuitModel(ring_length=L_fsr_10nm,             # we can manually specify the ring length
                                  coupler_parameters=[cp, cp])        # 2 couplers

# 2. Simulate
wavelengths =  np.linspace(1.54, 1.56, 2000)
R = my_ring_cm.get_smatrix(wavelengths=wavelengths)

# 3. Plot the results
plt.plot(wavelengths, np.abs(R['in1', 'out1']) ** 2, 'b', label='pass')
plt.plot(wavelengths, np.abs(R['in1', 'out2']) ** 2, 'g', label='drop')
plt.plot(wavelengths, np.abs(R['in1', 'in2']) ** 2, 'r', label='add')
plt.legend()
plt.show()
""" This example illustrates a simulation of a single ring resonator model based on the
layout that is first generated."""
from technologies import silicon_photonics
import ipkiss3.all as i3 # ipkiss
import pylab as plt, numpy as np #matplotlib and numpy

from picazzo3.filters.ring import RingRect180DropFilter

# 1. Define the ring
my_ring = RingRect180DropFilter(name="my_example_ring2")
my_ring_layout = my_ring.Layout(straights=(6.0, 0.0))

# set model in couplers and ring waveguides TODO: change the models
cp = dict(delta_n_eff=0.02) # coupler parameters
for coupler in my_ring.couplers:
    coupler.set_default_view(coupler.SimpleCircuitModel) # based on delta_n_eff
for ring_wg in my_ring.ring_segments:
    ring_wg.set_default_view(ring_wg.CircuitModel) # based on the actual waveguide length

# ring model
my_ring_cm = my_ring.CircuitModel(coupler_parameters=[cp, cp]) # 2 couplers

# 2. Simulate
wavelengths =  np.linspace(1.55, 1.58, 400)
R = my_ring_cm.get_smatrix(wavelengths=wavelengths)

# 3. Plot the results
plt.plot(wavelengths, np.abs(R['in1', 'out1']) ** 2, 'b', label='pass')
plt.plot(wavelengths, np.abs(R['in1', 'out2']) ** 2, 'g', label='drop')
plt.show()

Views

Layout
Parameters:

angle_step: float and number > 0, optional

angle step for rounding

coupler_lengths: list<number >= 0>, optional

straight lengths of the coupling section. By default, same lengths as the ring will be used

coupler_parameters: optional

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

grid: float and number > 0, optional

design grid. Extracted by default from TECH.METRICS.GRID

grids_per_unit: optional

Number of grid cells per design unit

manhattan: optional

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

rounding_algorithm: optional

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

units_per_grid: optional

Ratio of grid cell and design unit

view_name: str, optional

The name of the view

coupler_extensions: list<Coord2>, optional

additional length of the couplers. By default, the couplers will be extended to the size of the ring.

coupler_offsets: list<Real, number>, optional

list of offsets of the ring couplers along the centerline

coupler_spacings: list<Real, number>, optional

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)

straights: Coord2, optional

shape_position: Coord2, optional

Translation of the shape.

area_layer_on: optional

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

coupler_transformations: optional

list of coupler transformations

unit: float and number > 0, optional

design unit. Extracted by default from TECH.METRICS.UNIT

bend_radius: float and number > 0, optional

bend radius for the auto-generated bends

shape: locked

shapes: locked

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

Examples

from technologies import silicon_photonics
from ipkiss3 import all as i3
from picazzo3.filters.ring import RingRect180DropFilter
from picazzo3.traces.wire_wg.trace import WireWaveguideTemplate

wg1_t = WireWaveguideTemplate(name="wg_template_6")
wg1_t.Layout(core_width=0.5)

wg2_t = WireWaveguideTemplate(name="wg_template_7")
wg2_t.Layout(core_width=0.4)

wg3_t = WireWaveguideTemplate(name="wg_template_8")
wg3_t.Layout(core_width=0.6)

ring = RingRect180DropFilter(name="my_ringrectdropring",
                             ring_trace_template=wg1_t,
                             coupler_trace_templates=[wg2_t, wg3_t]) # In a list!!!
layout = ring.Layout(coupler_spacings=[0.65, 0.70], # This results in a 200nm and 250nm gap
            straights=(i3.TECH.WG.SHORT_STRAIGHT,i3.TECH.WG.SHORT_STRAIGHT+3.0),
            )

layout.visualize()
../../../../_images/picazzo3-filters-ring-cell-RingRect180DropFilter-3.png