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submissions/KLayout Python/EBeam_LukasChrostowski_MZI3_1550_FaML.py

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+'''
+--- Simple MZI, tested using Facet-Attached Micro Lenses (FaML) ---
+
+by Lukas Chrostowski, 2024
+
+Example simple script to
+ - choose the fabrication technology provided by Applied Nanotools,  using silicon nitride (SiN) waveguides
+ - use the SiEPIC-EBeam-PDK technology
+ - using KLayout and SiEPIC-Tools, with function including connect_pins_with_waveguide and connect_cell
+ - create a new layout with a top cell, limited a design area of 1000 microns wide by 410 microns high.
+ - create one Mach-Zehnder Interferometer (MZI) circuit with a small path length difference
+ - export to OASIS for submission to fabrication
+ - display the layout in KLayout using KLive
+
+ Test plan
+ - count lenses from the top (top is 1)
+ - laser input on top lens (1), detector on second (2) 
+
+Use instructions:
+
+Run in Python, e.g., VSCode
+
+pip install required packages:
+ - klayout, SiEPIC, siepic_ebeam_pdk, numpy
+
+'''
+
+designer_name = 'LukasChrostowski'
+top_cell_name = 'EBeam_%s_MZI1_FaML' % designer_name
+export_type = 'static'  # static: for fabrication, PCell: include PCells in file
+tech_name = 'EBeam'
+
+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, coupler_array
+from SiEPIC.extend import to_itype
+from SiEPIC.verification import layout_check
+
+import os
+
+if Python_Env == 'Script':
+    # For external Python mode, when installed using pip install siepic_ebeam_pdk
+    import siepic_ebeam_pdk
+
+print('EBeam_LukasChrostowski_MZI1 layout script')
+
+from packaging import version
+if version.parse(SiEPIC.__version__) < version.parse("0.5.4"):
+    raise Exception("Errors", "This example requires SiEPIC-Tools version 0.5.4 or greater.")
+
+'''
+Create a new layout using the EBeam technology,
+with a top cell
+and Draw the floor plan
+'''    
+cell, ly = new_layout(tech_name, top_cell_name, GUI=True, overwrite = True)
+floorplan(cell, 600e3, 370e3)
+
+waveguide_type1='SiN Strip TE 1550 nm, w=800 nm'
+waveguide_type_delay='SiN routing TE 1550 nm (compound waveguide)'
+
+# Load cells from library
+cell_ebeam_y = ly.create_cell('ebeam_sin_dream_splitter1x2_te1550_BB',  'EBeam-Dream')
+if not cell_ebeam_y:
+    raise Exception
+cell_taper_750_800 = ly.create_cell('taper_bezier',  'EBeam_Beta',
+                                {   'wg_width1':0.75,
+                                    'wg_width2':0.8,
+                                    'wg_length':1,
+                                    }
+                                    )
+if not cell_taper_750_800:
+    raise Exception
+
+#######################
+# Circuit #1 – MZI
+#######################
+# draw two edge couplers for facet-attached micro-lenses
+inst_faml = coupler_array(cell, 
+         cell_name = 'ebeam_dream_FaML_SiN_1550_BB',
+         cell_library = 'EBeam-Dream',
+         label = "opt_in_TE_1550_FaML_mzi3_%s" % designer_name,
+         #cell_params = None,
+         count = 3,
+         )    
+# Y branches:
+inst_taper0 = connect_cell(inst_faml[0], 'opt1', cell_taper_750_800, 'opt1')
+instY2 = connect_cell(inst_taper0, 'opt2', cell_ebeam_y, 'opt1')
+inst_taper1 = connect_cell(inst_faml[1], 'opt1', cell_taper_750_800, 'opt1')
+instY1a = connect_cell(inst_taper1, 'opt2', cell_ebeam_y, 'opt1')
+instY1 = connect_cell(instY1a, 'opt2', cell_ebeam_y, 'opt1')
+inst_taper2 = connect_cell(inst_faml[2], 'opt1', cell_taper_750_800, 'opt1')
+# Waveguides: 
+# MZI
+connect_pins_with_waveguide(instY1, 'opt2', instY2, 'opt3', waveguide_type=waveguide_type1)
+connect_pins_with_waveguide(instY1, 'opt3', instY2, 'opt2', waveguide_type=waveguide_type1, turtle_A=[300,-90])
+# loopback
+connect_pins_with_waveguide(instY1a, 'opt3', inst_taper2, 'opt2', waveguide_type=waveguide_type1)
+
+
+# Zoom out
+zoom_out(cell)
+
+# Export for fabrication, removing PCells
+path = os.path.dirname(os.path.realpath(__file__))
+for i in range(10):
+    filename, extension = os.path.splitext(os.path.basename(__file__))
+    filename+=f'_{i}'
+    if export_type == 'static':
+        file_out = export_layout(cell, path, filename, relative_path = '..', format='oas', screenshot=True)
+    else:
+        file_out = os.path.join(path,'..',filename+'.oas')
+        ly.write(file_out)
+
+# Verify
+file_lyrdb = os.path.join(path,filename+'.lyrdb')
+num_errors = layout_check(cell = cell, verbose=False, GUI=True, file_rdb=file_lyrdb)
+print('Number of errors: %s' % num_errors)
+
+# Display the layout in KLayout, using KLayout Package "klive", which needs to be installed in the KLayout Application
+if Python_Env == 'Script':
+    from SiEPIC.utils import klive
+    klive.show(file_out, lyrdb_filename=file_lyrdb, technology=tech_name)