Layout

All UBC ubcpdk.cells are conveniently combined into the ubcpdk.components module.

import gdsfactory as gf

from ubcpdk import PDK, cells

PDK.activate()

Fixed Component cells

Most ubcpdk components are imported from GDS files as fixed cells.

c = cells.ebeam_crossing4()
c.plot()

c = cells.ebeam_swg_edgecoupler()
c.plot()

c = cells.ebeam_bdc_te1550()
c.plot()

c = cells.ebeam_adiabatic_te1550()
c.plot()

c = cells.ebeam_y_adiabatic()
c.plot()

c = cells.ebeam_y_1550()
c.plot()

Parametric Component PCells

You can also define cells adapted from gdsfactory generic pdk.

c = cells.straight(length=2)
c.plot()

c = cells.bend_euler(radius=5)
c.plot()

c = cells.spiral()
c.plot()

c = cells.ring_single_heater()
c.plot()

Components with grating couplers

To test your devices you can add grating couplers. Both for single fibers and for fiber arrays.

splitter = cells.ebeam_y_1550()
mzi = gf.components.mzi(splitter=splitter)
mzi.plot()

component_fiber_array = cells.add_fiber_array(component=mzi, fanout_length=5)
component_fiber_array.plot()

c = cells.ring_single_heater()
c = cells.add_fiber_array_pads_rf(c)
c.plot()

c = cells.mzi_heater()
c = cells.add_fiber_array_pads_rf(c)
c.plot()

3D rendering

scene = c.to_3d()
scene.show()

Die assembly

from functools import partial

import gdsfactory as gf

from ubcpdk.tech import LAYER

size = (440, 470)
add_gc = cells.add_fiber_array


@gf.cell
def EBeam_JoaquinMatres_1() -> gf.Component:
    """Add DBR cavities."""
    e = [add_gc(cells.straight())]
    e += [add_gc(cells.mzi(delta_length=dl)) for dl in [9.32, 93.19]]
    e += [
        add_gc(cells.ring_single(radius=12, gap=gap, length_x=coupling_length))
        for gap in [0.2]
        for coupling_length in [2.5, 4.5, 6.5]
    ]

    c = gf.Component()
    _ = c << gf.pack(e, max_size=size, spacing=2)[0]
    _ = c << gf.components.rectangle(size=size, layer=LAYER.FLOORPLAN)
    return c


c = EBeam_JoaquinMatres_1()
c.show()  # show in klayout
c.plot()  # plot in notebook

def EBeam_JoaquinMatres_2() -> gf.Component:
    """spirals for extracting straight waveguide loss"""

    e = [
        cells.add_fiber_array(component=cells.spiral(n_loops=8, length=length))
        for length in [0, 100, 200]
    ]

    c = gf.Component()
    _ = c << gf.pack(e, max_size=size, spacing=2)[0]
    _ = c << gf.components.rectangle(size=size, layer=LAYER.FLOORPLAN)
    return c


c = EBeam_JoaquinMatres_2()
c.show()  # show in klayout
c.plot()  # plot in notebook

def EBeam_JoaquinMatres_3() -> gf.Component:
    """Contains mirror cavities and structures inside a resonator."""
    e = []
    e += [add_gc(cells.ebeam_crossing4())]
    e += [add_gc(cells.ebeam_adiabatic_te1550())]
    e += [add_gc(cells.ebeam_bdc_te1550())]
    e += [add_gc(cells.ebeam_y_1550())]
    e += [add_gc(cells.straight(), component_name=f"straight_{i}") for i in range(2)]
    c = gf.Component()
    _ = c << gf.pack(e, max_size=size, spacing=2)[0]
    _ = c << gf.components.rectangle(size=size, layer=LAYER.FLOORPLAN)
    return c


c = EBeam_JoaquinMatres_3()
c.show()  # show in klayout
c.plot()  # plot in notebook

2026-03-09 17:56:10.025 | ERROR    | kfactory.kcell:name:688 - Name conflict in kfactory.kcell::name at line 688
Renaming Unnamed_349 (cell_index=349) to straight_L10_CSstrip_WNone_N2_with_gc would cause it to be named the same as:
 - straight_L10_CSstrip_WNone_N2_with_gc (cell_index=130), function_name=None, basename=None

2026-03-09 17:56:10.054 | ERROR    | kfactory.kcell:name:688 - Name conflict in kfactory.kcell::name at line 688
Renaming Unnamed_351 (cell_index=351) to straight_L10_CSstrip_WNone_N2_with_gc would cause it to be named the same as:
 - straight_L10_CSstrip_WNone_N2_with_gc (cell_index=349), function_name=None, basename=None
 - straight_L10_CSstrip_WNone_N2_with_gc (cell_index=130), function_name=None, basename=None

def EBeam_JoaquinMatres_4() -> gf.Component:
    """MZI interferometers."""
    mzi = partial(gf.components.mzi, splitter=cells.ebeam_y_1550)
    mzis = [mzi(delta_length=delta_length) for delta_length in [10, 40]]
    mzis_gc = [cells.add_fiber_array(mzi, fanout_length=5) for mzi in mzis]

    mzis = [cells.mzi_heater(delta_length=delta_length) for delta_length in [40]]
    mzis_heater_gc = [
        cells.add_fiber_array_pads_rf(mzi, orientation=90) for mzi in mzis
    ]

    e = mzis_gc + mzis_heater_gc
    c = gf.Component()
    _ = c << gf.pack(e, max_size=size, spacing=2)[0]
    _ = c << gf.components.rectangle(size=size, layer=LAYER.FLOORPLAN)
    return c


c = EBeam_JoaquinMatres_4()
c.show()  # show in klayout
c.plot()  # plot in notebook

def EBeam_JoaquinMatres_5() -> gf.Component:
    """Ring resonators."""

    rings = []
    for length_x in [4, 6]:
        ring = cells.ring_single_heater(length_x=length_x)
        ring_gc = cells.add_fiber_array_pads_rf(ring, pad_yspacing=10)
        rings.append(ring_gc)

    c = gf.Component()
    _ = c << gf.pack(rings, max_size=size, spacing=2)[0]
    _ = c << gf.components.rectangle(size=size, layer=LAYER.FLOORPLAN)
    return c


c = EBeam_JoaquinMatres_5()
c.show()  # show in klayout
c.plot()  # plot in notebook