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‎submissions/KLayout Python/EBeam_LukasChrostowski_BraggMMcavity.py‎

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'''
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--- Fabry Perot cavity using Bragg gratings and long multi-mode waveguides ---
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by Lukas Chrostowski, 2025
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Simple script to
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- create a new layout with a top cell
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- create the Bragg cavity
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- export to OASIS for submission to fabrication
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using SiEPIC-Tools function including connect_pins_with_waveguide and connect_cell
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usage:
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- run this script in Python
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'''
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designer_name = 'LukasChrostowski'
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top_cell_name = 'EBeam_%s_BraggMMcavity' % designer_name
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import pya
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from pya import *
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import SiEPIC
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from SiEPIC._globals import Python_Env
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from SiEPIC.scripts import connect_cell, connect_pins_with_waveguide, zoom_out, export_layout
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from SiEPIC.utils.layout import new_layout, floorplan
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from SiEPIC.extend import to_itype
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import os
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if Python_Env == 'Script':
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try:
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# For external Python mode, when installed using pip install siepic_ebeam_pdk
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import siepic_ebeam_pdk
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except:
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# Load the PDK from a folder, e.g, GitHub, when running externally from the KLayout Application
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import os, sys
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path_GitHub = os.path.expanduser('~/Documents/GitHub/')
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sys.path.append(os.path.join(path_GitHub, 'SiEPIC_EBeam_PDK/klayout'))
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import siepic_ebeam_pdk
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tech_name = 'EBeam'
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if SiEPIC.__version__ < '0.5.1':
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raise Exception("Errors", "This example requires SiEPIC-Tools version 0.5.1 or greater.")
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'''
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Create a new layout using the EBeam technology,
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with a top cell
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and Draw the floor plan
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'''
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topcell, ly = new_layout(tech_name, top_cell_name, GUI=True, overwrite = True)
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floorplan(topcell, 605e3, 410e3)
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dbu = ly.dbu
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from SiEPIC.scripts import connect_pins_with_waveguide, connect_cell
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waveguide_type='Strip TE 1310 nm, w=350 nm'
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waveguide_type_delay='Si routing TE 1310 nm (compound waveguide)'
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# Load cells from library
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cell_ebeam_gc = ly.create_cell('GC_TE_1310_8degOxide_BB', tech_name)
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cell_ebeam_y = ly.create_cell('ebeam_y_1310', 'EBeam_Beta')
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# define parameters for the designs
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params_BraggN = [40, 50, 60, 70]
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for i in range(0,4):
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cell = ly.create_cell('cell%s' % i)
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x,y = 52000*i, -40000*i
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t = Trans(Trans.R0,x,y)
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topcell.insert(CellInstArray(cell.cell_index(), t))
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cell_bragg = ly.create_cell('ebeam_bragg_te1310', 'EBeam_Beta', {
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'number_of_periods':params_BraggN[i],
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'grating_period': 0.270,
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'corrugation_width': 0.08,
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'wg_width': 0.35,
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'sinusoidal': True})
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if not cell_bragg:
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raise Exception ('Cannot load Bragg grating cell; please check the script carefully.')
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# Circuit design, with a very long delay line
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cell_ebeam_delay = ly.create_cell('spiral_paperclip', 'EBeam_Beta',{
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'waveguide_type':waveguide_type_delay,
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'length':160,
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'loops':1,
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'flatten':True})
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x,y = 41000, 140000
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t = Trans(Trans.R0,x,y)
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instGC1 = cell.insert(CellInstArray(cell_ebeam_gc.cell_index(), t))
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t = Trans(Trans.R0,x,y+127000)
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instGC2 = cell.insert(CellInstArray(cell_ebeam_gc.cell_index(), t))
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t = Trans(Trans.R0,x,y+127000*2)
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instGC3 = cell.insert(CellInstArray(cell_ebeam_gc.cell_index(), t))
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# automated test label
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text = Text ("opt_in_TE_1310_device_%s_BraggMMcavity%s" % (designer_name, params_BraggN[i]), t)
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cell.shapes(ly.layer(ly.TECHNOLOGY['Text'])).insert(text).text_size = 5/dbu
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# Y branches:
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instY1 = connect_cell(instGC3, 'opt1', cell_ebeam_y, 'opt3')
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instY1.transform(Trans(10000,0))
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# Bragg grating
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instBragg1 = connect_cell(instY1, 'opt1', cell_bragg, 'opt1')
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instBragg1.transform(Trans(10000,0))
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# Spiral:
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instSpiral = connect_cell(instBragg1, 'opt2', cell_ebeam_delay, 'optA')
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# Bragg grating
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instBragg2 = connect_cell(instSpiral, 'optB', cell_bragg, 'opt2')
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# Waveguides:
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connect_pins_with_waveguide(instGC3, 'opt1', instY1, 'opt3', waveguide_type=waveguide_type)
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connect_pins_with_waveguide(instGC2, 'opt1', instY1, 'opt2', waveguide_type=waveguide_type, turtle_B=[5,90,5,-90])
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connect_pins_with_waveguide(instGC1, 'opt1', instBragg2, 'opt1', waveguide_type=waveguide_type, turtle_B=[5,90,10,-90,20,90])
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connect_pins_with_waveguide(instY1, 'opt1', instBragg1, 'opt1', waveguide_type=waveguide_type,turtle_B=[5,-90])
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# Zoom out
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zoom_out(cell)
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# Save
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path = os.path.dirname(os.path.realpath(__file__))
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filename = os.path.splitext(os.path.basename(__file__))[0]
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file_out = export_layout(topcell, path, filename, relative_path = '..', format='oas', screenshot=False)
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‎submissions/KLayout Python/EBeam_LukasChrostowski_BraggMMcavityB.py‎

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'''
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--- Fabry Perot cavity using Bragg gratings and long multi-mode waveguides ---
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by Lukas Chrostowski, 2025
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Simple script to
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- create a new layout with a top cell
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- create the Bragg cavity
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- export to OASIS for submission to fabrication
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using SiEPIC-Tools function including connect_pins_with_waveguide and connect_cell
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usage:
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- run this script in Python
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'''
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designer_name = 'LukasChrostowski'
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top_cell_name = 'EBeam_%s_BraggMMcavityB' % designer_name
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import pya
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from pya import *
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import SiEPIC
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from SiEPIC._globals import Python_Env
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from SiEPIC.scripts import connect_cell, connect_pins_with_waveguide, zoom_out, export_layout
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from SiEPIC.utils.layout import new_layout, floorplan
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from SiEPIC.extend import to_itype
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import os
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if Python_Env == 'Script':
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try:
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# For external Python mode, when installed using pip install siepic_ebeam_pdk
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import siepic_ebeam_pdk
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except:
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# Load the PDK from a folder, e.g, GitHub, when running externally from the KLayout Application
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import os, sys
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path_GitHub = os.path.expanduser('~/Documents/GitHub/')
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sys.path.append(os.path.join(path_GitHub, 'SiEPIC_EBeam_PDK/klayout'))
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import siepic_ebeam_pdk
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tech_name = 'EBeam'
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if SiEPIC.__version__ < '0.5.1':
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raise Exception("Errors", "This example requires SiEPIC-Tools version 0.5.1 or greater.")
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'''
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Create a new layout using the EBeam technology,
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with a top cell
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and Draw the floor plan
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'''
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topcell, ly = new_layout(tech_name, top_cell_name, GUI=True, overwrite = True)
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floorplan(topcell, 605e3, 410e3)
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dbu = ly.dbu
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from SiEPIC.scripts import connect_pins_with_waveguide, connect_cell
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waveguide_type='Strip TE 1310 nm, w=350 nm'
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waveguide_type_delay='Si routing TE 1310 nm (compound waveguide)'
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# Load cells from library
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cell_ebeam_gc = ly.create_cell('GC_TE_1310_8degOxide_BB', tech_name)
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cell_ebeam_y = ly.create_cell('ebeam_y_1310', 'EBeam_Beta')
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# define parameters for the designs
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params_BraggN = [6, 7, 8, 9]
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for i in range(0,4):
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cell = ly.create_cell('cell%s' % i)
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x,y = 52000*i, -40000*i
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t = Trans(Trans.R0,x,y)
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topcell.insert(CellInstArray(cell.cell_index(), t))
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cell_bragg = ly.create_cell('BraggWaveguide_holes', 'EBeam_Beta', {
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'number_of_periods':params_BraggN[i],
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'grating_period':0.326, 'wg_width':0.35})
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'''
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cell_bragg = ly.create_cell('BraggWaveguide_holes', 'EBeam_Beta', {
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'number_of_periods':params_BraggN[i],
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'grating_period':0.45, 'wg_width':0.5})
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'''
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if not cell_bragg:
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raise Exception ('Cannot load Bragg grating cell; please check the script carefully.')
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# Circuit design, with a very long delay line
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cell_ebeam_delay = ly.create_cell('spiral_paperclip', 'EBeam_Beta',{
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'waveguide_type':waveguide_type_delay,
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'length':160,
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'loops':1,
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'flatten':True})
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x,y = 41000, 140000
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t = Trans(Trans.R0,x,y)
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instGC1 = cell.insert(CellInstArray(cell_ebeam_gc.cell_index(), t))
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t = Trans(Trans.R0,x,y+127000)
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instGC2 = cell.insert(CellInstArray(cell_ebeam_gc.cell_index(), t))
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t = Trans(Trans.R0,x,y+127000*2)
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instGC3 = cell.insert(CellInstArray(cell_ebeam_gc.cell_index(), t))
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# automated test label
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text = Text ("opt_in_TE_1310_device_%s_BraggMMcavityB%s" % (designer_name, params_BraggN[i]), t)
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cell.shapes(ly.layer(ly.TECHNOLOGY['Text'])).insert(text).text_size = 5/dbu
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# Y branches:
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instY1 = connect_cell(instGC3, 'opt1', cell_ebeam_y, 'opt3')
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instY1.transform(Trans(20000,0))
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# Bragg grating
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instBragg1 = connect_cell(instY1, 'opt1', cell_bragg, 'opt1')
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instBragg1.transform(Trans(10000,0))
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# Spiral:
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instSpiral = connect_cell(instBragg1, 'opt2', cell_ebeam_delay, 'optA')
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# Bragg grating
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instBragg2 = connect_cell(instSpiral, 'optB', cell_bragg, 'opt2')
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# Waveguides:
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connect_pins_with_waveguide(instGC3, 'opt1', instY1, 'opt3', waveguide_type=waveguide_type)
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connect_pins_with_waveguide(instGC2, 'opt1', instY1, 'opt2', waveguide_type=waveguide_type, turtle_B=[15,90,5,-90])
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connect_pins_with_waveguide(instGC1, 'opt1', instBragg2, 'opt1', waveguide_type=waveguide_type, turtle_A=[10 ,90, 100,-90], turtle_B=[5,90,10,-90,20,90])
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connect_pins_with_waveguide(instY1, 'opt1', instBragg1, 'opt1', waveguide_type=waveguide_type,turtle_B=[5,-90])
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# Zoom out
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zoom_out(cell)
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# Save
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path = os.path.dirname(os.path.realpath(__file__))
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filename = os.path.splitext(os.path.basename(__file__))[0]
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file_out = export_layout(topcell, path, filename, relative_path = '..', format='oas', screenshot=False)
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