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+'''
+--- Fabry Perot cavity using Bragg gratings and long multi-mode waveguides ---
+   
+by Lukas Chrostowski, 2024
+ 
+Simple script to
+ - create a new layout with a top cell
+ - create the Bragg cavity
+ - export to OASIS for submission to fabrication
+
+using SiEPIC-Tools function including connect_pins_with_waveguide and connect_cell
+
+usage:
+ - run this script in Python
+'''
+
+designer_name = 'MandyChen'
+top_cell_name = 'EBeam_%s' % designer_name
+
+import pya
+from pya import *
+
+import SiEPIC
+from SiEPIC._globals import Python_Env
+from SiEPIC.scripts import connect_cell, connect_pins_with_waveguide, zoom_out, export_layout
+from SiEPIC.utils.layout import new_layout, floorplan
+from SiEPIC.extend import to_itype
+
+import os
+
+if Python_Env == 'Script':
+    try:
+        # For external Python mode, when installed using pip install siepic_ebeam_pdk
+        import siepic_ebeam_pdk
+    except:
+        # Load the PDK from a folder, e.g, GitHub, when running externally from the KLayout Application
+        import os, sys
+        path_GitHub = os.path.expanduser('~/Documents/GitHub/')
+        sys.path.append(os.path.join(path_GitHub, 'SiEPIC_EBeam_PDK/klayout'))
+        import siepic_ebeam_pdk
+
+tech_name = 'EBeam'
+
+if SiEPIC.__version__ < '0.5.1':
+    raise Exception("Errors", "This example requires SiEPIC-Tools version 0.5.1 or greater.")
+
+'''
+Create a new layout using the EBeam technology,
+with a top cell
+and Draw the floor plan
+'''    
+topcell, ly = new_layout(tech_name, top_cell_name, GUI=True, overwrite = True)
+floorplan(topcell, 605e3, 410e3)
+
+dbu = ly.dbu
+
+from SiEPIC.scripts import connect_pins_with_waveguide, connect_cell
+waveguide_type='Strip TE 1310 nm, w=350 nm'
+waveguide_type_delay='Si routing TE 1310 nm (compound waveguide)'
+
+# Load cells from library
+cell_ebeam_gc = ly.create_cell('GC_TE_1310_8degOxide_BB', tech_name)
+cell_ebeam_y = ly.create_cell('ebeam_y_1310', 'EBeam_Beta')
+
+# define parameters for the designs
+params_BraggN = [40, 50, 60, 70]
+
+for i in range(0,4):
+    cell = ly.create_cell('cell%s' % i)
+
+    x,y = 52000*i, -40000*i
+    t = Trans(Trans.R0,x,y)
+    topcell.insert(CellInstArray(cell.cell_index(), t))
+    
+    
+    cell_bragg = ly.create_cell('ebeam_bragg_te1310', 'EBeam_Beta', {
+        'number_of_periods':params_BraggN[i],
+        'grating_period': 0.265,
+        'corrugation_width': 0.021,
+        'wg_width': 0.35,
+        'sinusoidal': True})
+    if not cell_bragg:
+        raise Exception ('Cannot load Bragg grating cell; please check the script carefully.')
+    
+    # Circuit design, with a very long delay line
+    cell_ebeam_delay = ly.create_cell('spiral_paperclip', 'EBeam_Beta',{
+                            'waveguide_type':waveguide_type_delay,
+                            'length':160,
+                            'loops':1,
+                            'flatten':True})
+    x,y = 41000, 140000
+    t = Trans(Trans.R0,x,y)
+    instGC1 = cell.insert(CellInstArray(cell_ebeam_gc.cell_index(), t))
+    t = Trans(Trans.R0,x,y+127000)
+    instGC2 = cell.insert(CellInstArray(cell_ebeam_gc.cell_index(), t))
+    t = Trans(Trans.R0,x,y+127000*2)
+    instGC3 = cell.insert(CellInstArray(cell_ebeam_gc.cell_index(), t))
+    
+    # automated test label
+    text = Text ("opt_in_TE_1310_device_%s_BraggMMcavity%s" % (designer_name, params_BraggN[i]), t)
+    cell.shapes(ly.layer(ly.TECHNOLOGY['Text'])).insert(text).text_size = 5/dbu
+    
+    # Y branches:
+    instY1 = connect_cell(instGC3, 'opt1', cell_ebeam_y, 'opt3')
+    instY1.transform(Trans(10000,0))
+    
+    # Bragg grating
+    instBragg1 = connect_cell(instY1, 'opt1', cell_bragg, 'opt1')
+    instBragg1.transform(Trans(10000,0))
+    
+    # Spiral:
+    instSpiral = connect_cell(instBragg1, 'opt2', cell_ebeam_delay, 'optA')
+    
+    # Bragg grating
+    instBragg2 = connect_cell(instSpiral, 'optB', cell_bragg, 'opt2')
+    
+    # Waveguides:
+    connect_pins_with_waveguide(instGC3, 'opt1', instY1, 'opt3', waveguide_type=waveguide_type)
+    connect_pins_with_waveguide(instGC2, 'opt1', instY1, 'opt2', waveguide_type=waveguide_type, turtle_B=[5,90,5,-90])
+    connect_pins_with_waveguide(instGC1, 'opt1', instBragg2, 'opt1', waveguide_type=waveguide_type, turtle_B=[5,90,10,-90,20,90])
+    connect_pins_with_waveguide(instY1, 'opt1', instBragg1, 'opt1', waveguide_type=waveguide_type,turtle_B=[5,-90])
+    
+
+
+# Zoom out
+zoom_out(cell)
+
+# Save
+path = os.path.dirname(os.path.realpath(__file__))
+filename = os.path.splitext(os.path.basename(__file__))[0]
+file_out = export_layout(cell, path, filename, relative_path = '..', format='oas', screenshot=False)
+