Unable to use resonator cells

[paniash]

Hi,

After the newly tagged release, I'm trying to use the resonator_coupled PCell but get a ValueError when running the following:

import gdsfactory as gf
import matplotlib.pyplot as plt
import numpy as np
from qpdk.cells import resonator_coupled, bend_circular

c = gf.Component()
r = resonator_coupled(bend_spec=bend_circular)

c.add_ref(r)

# Show result
c.show()

Error:

ValueError: 'cpw' not in ['strip', 'strip_no_ports', 'rib', 'rib_bbox', 'rib2', 'nitride', 'strip_rib_tip', 'strip_nitride_tip', 'slot', 'rib_with_trenches', 'l_with_trenches', 'metal1', 'metal2', 'metal3', 'metal_routing', 'heater_metal', 'npp', 'pin', 'pn', 'pn_with_trenches', 'pn_with_trenches_asymmetric', 'l_wg_doped_with_trenches', 'strip_heater_metal_undercut', 'strip_heater_metal', 'strip_heater_doped', 'rib_heater_doped', 'rib_heater_doped_via_stack', 'pn_ge_detector_si_contacts']

Apparently "cpw" is not a part of any allowed cross-section values.

[nikosavola]

Hi,

After the newly tagged release, I'm trying to use the resonator_coupled PCell but get a ValueError when running the following:

import gdsfactory as gf
import matplotlib.pyplot as plt
import numpy as np
from qpdk.cells import resonator_coupled, bend_circular

c = gf.Component()
r = resonator_coupled(bend_spec=bend_circular)

c.add_ref(r)

Show result

c.show()
Error:

ValueError: 'cpw' not in ['strip', 'strip_no_ports', 'rib', 'rib_bbox', 'rib2', 'nitride', 'strip_rib_tip', 'strip_nitride_tip', 'slot', 'rib_with_trenches', 'l_with_trenches', 'metal1', 'metal2', 'metal3', 'metal_routing', 'heater_metal', 'npp', 'pin', 'pn', 'pn_with_trenches', 'pn_with_trenches_asymmetric', 'l_wg_doped_with_trenches', 'strip_heater_metal_undercut', 'strip_heater_metal', 'strip_heater_doped', 'rib_heater_doped', 'rib_heater_doped_via_stack', 'pn_ge_detector_si_contacts']

Apparently "cpw" is not a part of any allowed cross-section values.

Hi Ashish, this is a gdsfactory-specific caveat. You need to run:

from qpdk import PDK

PDK.activate()

before calling resonator_coupled. This is because the cross_section argument for resonator_coupled has a string valued default value:

    cross_section: CrossSectionSpec = "cpw",

Activating the PDK enables the get_cross_section call in gdsfactory to fetch the cross_section using only string instead of providing a cross_section directly.

[paniash]

Hi Niko, thanks for this! It works now. :)