# IoFibcoupEastWest¶

class picazzo3.container.iofibcoup.IoFibcoupEastWest(*args, **kwargs)

Adapter for grating fiber couplers East and West.

The component East and West ports are treated seperately, and routed towards the East and West, respectively. For this routing, they go through several steps. The settings for the East and West grating couplers can be tuned.

Here, we discuss the use for the East ports, but a similar set of parameters is available for the West ports.

1. First of all, the ports of the component are transitioned to a common trace template east_trace_template. By default, it uses the standard waveguide definition defined in TECH.PCELLS.WG.DEFAULT. However, if set to None , the trace will use the trace template of the actual port. The same holds for east_transition_length. This can be manually specified by the user, but if a value in the list is set to None, the default length of that type of transition will be used.
2. Then, the ports are fanned out to the fixed y_spacing of the fiber couplers. The length of that Fanout can be specified through east_fanout_length. Similarly, bend radius and rounding algorithm can be set through the parameter bend_radius and rounding_algorithm. If west_bundle_traces is True, the cover layers will be drawn over the Fanout. This can help reduce DRC errors.
3. Then, the waveguides are transitioned to another waveguide template, specified in east_connect_trace_template. By default, this is the same template as east_trace_template, but it is possible to override it to use a lower loss multi-mode waveguide. The connection for which this waveguide is used is a simple straigth connection, but depending on the chip layout it can have a long length. The transition length can be manually specified using the east_connect_transition_length.
4. At the output, the waveguides are transitioned to the waveguide template of the individual input and output fiber couplers. The transition length from the connection waveguide to the grating coupler can be specified using east_fiber_coupler_transition_length.
5. Finally, the circuit is terminated with fiber couplers, using the PCell specified in east_fiber_coupler

The same procedure and parameters are used for the west ports

Parameters: east_fiber_coupler: PCell, optional Fiber coupler to be attached to the East ports. Defaults to TECH.IO.FIBCOUP.DEFAULT.PCELLS.DEFAULT_GRATING east_trace_template: optional The trace template that will be used for the Fanout of the East ports. If ‘None’, the trace template of the individual port will be used. Defaults to TECH.PCELLS.WG.DEFAULT. west_fiber_coupler_external_port_name_map: optional Dicts to map the names of the West fiber coupler ports that will be exposed as external ports. The dict is of the form {‘port_name_on_termination’: ‘unique_external_port_name’, …}. the ‘unique_external_port_name’ string can contain the identifier {port}, which will be replaced by the corresponding port name on the component. For example, the default is {‘vertical_in’ : ‘{port}’}, which will map the port ‘vertical_in’ of the fiber coupler to the name of port on the component. west_trace_template: optional The trace template that will be used for the Fanout of the West ports. If ‘None’, the trace template of the individual port will be used. Defaults to TECH.PCELLS.WG.DEFAULT. east_connect_trace_template: optional The trace template that will be used for connecting the Fanout of the East ports. to the Grating couplers. If ‘None’, the trace template of the individual port will be used. Defaults to the same as east_trace_template. west_connect_trace_template: optional The trace template that will be used for connecting the Fanout of the West ports. to the Grating couplers. If ‘None’, the trace template of the individual port will be used. Defaults to the same as west_trace_template. east_fiber_coupler_external_port_name_map: optional Dicts to map the names of the East fiber coupler ports that will be exposed as external ports. The dict is of the form {‘port_name_on_termination’: ‘unique_external_port_name’, …}. the ‘unique_external_port_name’ string can contain the identifier {port}, which will be replaced by the corresponding port name on the component. For example, the default is {‘vertical_in’ : ‘{port}’}, which will map the port ‘vertical_in’ of the fiber coupler to the name of port on the component. west_fiber_coupler: PCell, optional Fiber coupler to be attached to the West ports. Defaults to TECH.IO.FIBCOUP.DEFAULT.PCELLS.DEFAULT_GRATING east_fiber_coupler_port_labels: List with type restriction, allowed types: , optional Port labels of the East fiber couplers connected to the ports of the contents. For fiber couplers with more than one port, the port labels should be concatenated with a ‘,’. For example, when using 2D grating couplers, the ports could be [‘in1,in2’, ‘in’]. This will use ports ‘in1’ and ‘in2’ of the first grating coupler, and ‘in’ of the second.By default, all the West ports of all the fiber couplers are used. If an entry in the list is ‘None’, also the west ports of that fiber coupler are used. The number of entries in the list should not be identical to the number of East port. If the component has fewer East ports, only the first entries in the list will be used. If the component has more East ports, the list is just recycled. Therefore, it is allowed to use a list of just one element for multiple ports. west_fiber_coupler_port_labels: List with type restriction, allowed types: , optional Port labels of the West fiber couplers connected to the ports of the contents. For fiber couplers with more than one port, the port labels should be concatenated with a ‘,’. For example, when using 2D grating couplers, the ports could be [‘in1,in2’, ‘in’]. This will use ports ‘in1’ and ‘in2’ of the first grating coupler, and ‘in’ of the second.By default, all the East ports of the fiber coupler are used. If an entry in the list is ‘None’, also the East ports of that fiber coupler are used. The number of entries in the list should not be identical to the number of West port. If the component has fewer West ports, only the first entries in the list will be used. If the component has more West ports, the list is just recycled. Therefore, it is allowed to use a list of just one element for multiple ports. east_port_labels: optional Labels of the ports to directed to the East. Set to None to process all East ports. west_port_labels: optional Labels of the ports to directed to the West. Set to None to process all West ports. contents: PCell, optional the contents of the container: the child cell external_port_names: optional Dictionary for remapping of the port names of the contents to the external ports cell_instances: _PCellInstanceDict, optional name: optional The unique name of the pcell east_fiber_coupler_external_port_name_maps: locked west_connect_trace_templates: List with type restriction, allowed types: , locked west_fiber_couplers: List with type restriction, allowed types: , locked west_trace_templates: List with type restriction, allowed types: , locked east_connect_trace_templates: List with type restriction, allowed types: , locked east_trace_templates: List with type restriction, allowed types: , locked east_fiber_couplers: List with type restriction, allowed types: , locked west_fiber_coupler_external_port_name_maps: locked port_labels: locked

Examples

""" This example illustrates how the IoFibcoupEastWest properties can customize
the routing in an IoColumn."""
from technologies import silicon_photonics
from ipkiss3 import all as i3
from picazzo3.filters.mmi import MMIIdentical
from picazzo3.traces.wire_wg import WireWaveguideTemplate

wg_t1 = WireWaveguideTemplate()
my_mmi = MMIIdentical(mmi_trace_template=wg_t1,
n_inputs=1,
n_outputs=5)
my_mmi.Layout(length=10.0,
input_y_positions=[-1.0],
output_y_positions=[-2.0, -1.0, 0.0, 1.0, 2.0]
)

from picazzo3.container.iofibcoup import IoFibcoupEastWest

from ipkiss3.pcell.blocks.iocolumn import IoColumn

my_column = IoColumn(name="iocol",
max_n_o_lines=100)
my_column.Layout(south_east=(1200.0, 0.0))

relative_offset=(0.0, 50.0),
transformation=i3.Rotation(rotation=180.0))

layout = my_column.Layout()
layout.visualize()


Views

Layout
Parameters: angle_step: float and number > 0, optional angle step for rounding bend_radius: float and number > 0, optional bend radius for the auto-generated bends draw_block_outline: optional Draw the outline of the block when set to True flatten_contents: optional if True, it will insert the contents as elements in the layout, rather than as an Instance manhattan: optional adds rectangular blocks in the bends to avoid as much as possible non-manhattan angles relative_offset: Coord2, optional Offset of the component as it is positioned by absolute_offset rounding_algorithm: optional rounding algorithm used to generate the bends. Can be circular, spline, … south_east: Coord2, optional Position of the south east corner of the block south_west: Coord2, optional Position of the south west corner of the block view_name: str, optional The name of the view west_bundle_traces: optional Combine the Fanout waveguides on the West in a bundle (adding Cover layers)? west_fiber_coupler_transformation: GenericNoDistortTransform, optional y_spacing: float and number > 0, optional The spacing between blocks east_fiber_coupler_transition_length: optional The length of the transition between the East straight connection traces and the fiber coupler. If ‘None’, the default length for that type of transition is used. west_fiber_coupler_transition_length: optional The length of the transition between the West straight connection traces and the fiber coupler. If ‘None’, the default length for that type of transition is used. east_connect_transition_length: optional The lengths of the transitions between the East fanout ports and the straight connection traces to the fiber coupler. If ‘None’, the default length for that type of transition is used. west_connect_transition_length: optional The lengths of the transitions between the West fanout ports and the straight connection traces to the fiber coupler. If ‘None’, the default length for that type of transition is used. east_fanout_length: optional Length of the Fanout section of the East ports. If None the length will be chosen automatically.If the required length is larger than the specified length, additional space will be used. east_max_s_bend_angle: float and number > 0 and ]0.0,90.0], optional Maximum angle for the S-bend in the fanout of the East ports. west_fanout_length: optional Length of the Fanout section of the West ports. If None the length will be chosen automatically.If the required length is larger than the specified length, additional space will be used. west_max_s_bend_angle: float and number > 0 and ]0.0,90.0], optional Maximum angle for the S-bend in the fanout of the West ports. east_transition_length: optional The lengths of the transitions between the East ports of the component and the traces of the Fanout. If ‘None’, the default length for that type of transition is used. west_transition_length: optional The lengths of the transitions between the West ports of the component and the traces of the Fanout. If ‘None’, the default length for that type of transition is used. east_fiber_coupler_transformation: GenericNoDistortTransform, optional east_bundle_traces: optional Combine the Fanout waveguides on the east in a bundle (adding Cover layers)? east_fanout_lengths: optional Lengths of the waveguides in the Fanout section of the East ports. If an entry in the list is None the lengths will be chosen automatically.If the required length is larger than the specified length, additional space will be used. east_max_s_bend_angles: optional Maximum angles for the S-bend in the fanout of the East ports. west_fanout_lengths: optional Lengths of the waveguides in the Fanout section of the West ports. If an entry in the list is None the lengths will be chosen automatically.If the required length is larger than the specified length, additional space will be used. west_max_s_bend_angles: optional Maximum angle for the S-bend in the fanout of the West ports. absolute_offset: Coord2, optional Offset of the component from the (0,0) of the adapter.By default this offset will be calculated such that the component ports areX-aligned around the center and that the first West port is Y-aligned to the south_west.This is after the contents_transformation has been applied. contents_transformation: GenericNoDistortTransform, optional outline_layer: __Layer__, optional Layer on which to draw the block outline east_align_fanout: locked east_connect_transition_lengths: locked grid: float and number > 0, locked design grid. Extracted by default from TECH.METRICS.GRID grids_per_unit: locked Number of grid cells per design unit units_per_grid: locked Ratio of grid cell and design unit west_align_fanout: locked west_connect_transition_lengths: locked east_fiber_coupler_transition_lengths: locked west_fiber_coupler_transition_lengths: locked east_transition_lengths: locked west_transition_lengths: locked east_fiber_coupler_transformations: locked west_fiber_coupler_transformations: locked south_offset: int, locked The y-offset between south_west & south_east, measured in units of y_spacing width: float and Real, number and number >= 0, locked The width of the block, calculated using south_west & south_east unit: float and number > 0, locked design unit. Extracted by default from TECH.METRICS.UNIT

Examples

""" This example illustrates the default settings of IoFibcoupEastWest ,
from technologies import silicon_photonics
from ipkiss3 import all as i3
from picazzo3.filters.ring import RingRect180DropFilter

my_ring = RingRect180DropFilter()

from picazzo3.container.iofibcoup import IoFibcoupEastWest

iofb = IoFibcoupEastWest(contents=my_ring)
iofb_layout = iofb.Layout()
iofb_layout.visualize()

""" This example takes an MMI and encapsulates it in an IoFibcoupEastWest adapter. It customizes several parameters of the adapter
for individual tailoring of the East and West outputs."""
from technologies import silicon_photonics
from ipkiss3 import all as i3
from picazzo3.filters.mmi import MMIIdentical
from picazzo3.traces.wire_wg import WireWaveguideTemplate

# normal waveguide template: single mode
wg_t = WireWaveguideTemplate()
wg_t.Layout(core_width=0.46)

# connect_template: wider to reduce losses
wgc_t = WireWaveguideTemplate()
wgc_t.Layout(core_width=2.0)

# MMI
wg_t1 = WireWaveguideTemplate()
# input and output traces of the MMI
wg_t2 = WireWaveguideTemplate()
wg_t2.Layout(core_width=0.6)

my_mmi = MMIIdentical(mmi_trace_template=wg_t1,
input_trace_template=wg_t2,
output_trace_template=wg_t2,
n_inputs=1,
n_outputs=5)
my_mmi.Layout(length=10.0,
input_y_positions=[-1.0],
output_y_positions=[-2.0, -1.0, 0.0, 1.0, 2.0]
)

# fiber coupler
from picazzo3.fibcoup.uniform import UniformLineGrating

my_gc = UniformLineGrating(trace_template=wg_t1)

from picazzo3.container.iofibcoup import IoFibcoupEastWest

iofb = IoFibcoupEastWest(contents=my_mmi,                       # the component
east_trace_template=wg_t,           # trace template for East fanout
west_trace_template=wg_t,           # trace_template for West fanout
east_connect_trace_template=wgc_t,  # trace template for wide connections
west_connect_trace_template=wgc_t,  # trace template for wide connections
east_fiber_coupler=my_gc,           # fiber coupler East
west_fiber_coupler=my_gc)           # fiber coupler West

iofb_layout = iofb.Layout(contents_transformation=i3.Rotation(rotation=-30.0),  # rotate the contents
east_connect_transition_length=30.0,                  # transition length
east_fiber_coupler_transition_length=50.0,            # transition length between connection WG and the fiber coupler
south_west=(-0.0, 0.0),                               # south west corner of the adapter
south_east=(1200.0, 0.0),                             # south east corner of the adapter
relative_offset=(-100.0, 70.0)                        # offset of component from the center.
)
iofb_layout.visualize()