implemented and did some testing about applying a conic filter on phase masks. This should smooth out outliers at the cost of a possible reduction of total overlap efficiency. Several example devices have been added for testing purposes.

2026-10-14 23:26:38 +00:00 · 2026-09-08 16:56:56 +02:00
parent b4e79330b1
commit 45492233d4
5 changed files with 250 additions and 108 deletions
@@ -0,0 +1,86 @@
+import mpid as pid
+import numpy as np
+import os
+if not os.path.exists("results"):
+    os.makedirs("results")
+
+#Space grid definition
+N = 1025
+unit_cell_pitch = 700e-9
+
+n0 = 1.45
+n1 = 1.0
+n2 = 1.45
+mat_refr_index = np.array([n0, n1, n2])
+
+d0 = 476e-6 #propagation distance: source - MS1 [m]
+d1 = 510e-6 #propagation distance: MS1 - MS2 [m]
+d2 = d0 #propagation distance: MS2 - target [m]
+d = np.array([d0, d1, d2])
+
+ms_max_available_diameter = 122e-6 #[um]
+output_fiber_core_diameter = 19e-6 #[um]
+opt_max_eval = 140
+
+space_grid = pid.SpaceGrid(
+    side_pixels=N, 
+    unit_cell_pitch = unit_cell_pitch, 
+    prop_distances=d, 
+    materials_refr_index=mat_refr_index,
+)
+
+wavelength = 1.55e-6
+
+#define the sources
+source1 = pid.Source(input_field='fiber_modes/LP11_field_distribution_lda_1550_N_1025.npy', 
+                     wavelength=wavelength, 
+                     space_grid=space_grid, 
+                     field_norm=True)
+source2 = pid.Source(input_field='fiber_modes/LP21_field_distribution_lda_1550_N_1025.npy', 
+                     wavelength=wavelength, 
+                     space_grid=space_grid, 
+                     field_norm=True)
+
+
+target = pid.Target(input_field='fiber_modes/LP11_field_distribution_lda_1550_N_1025.npy', 
+                    center=(20e-6,0),
+                    associated_source=source1, 
+                    wavelength=wavelength, 
+                    space_grid=space_grid, 
+                    field_norm=True)
+target2 = pid.Target(input_field='fiber_modes/LP21_field_distribution_lda_1550_N_1025.npy', 
+                     center=(-20e-6,0),
+                     associated_source=source2, 
+                     wavelength=wavelength, 
+                     space_grid=space_grid, 
+                     field_norm=True) 
+
+#make a plot of sources and targets
+target.plot2D(plot_zoom_x=100, plot_zoom_y=100, choose_quantity="amplitude", save_name="results/target_plot")
+target2.plot2D(plot_zoom_x=100, plot_zoom_y=100, choose_quantity="amplitude", save_name="results/target2_plot")
+source1.plot2D(plot_zoom_x=100, plot_zoom_y=100, choose_quantity="amplitude", save_name="results/source1_plot")
+source2.plot2D(plot_zoom_x=100, plot_zoom_y=100, choose_quantity="amplitude", save_name="results/source2_plot")
+
+sim = pid.Simulation(
+    sources=[source1, source2],
+    targets=[target, target2],
+    central_wavelength=wavelength,
+    space_grid=space_grid,
+    n_cpu=1
+)
+
+opt_param_min = 0
+opt_param_max = 1
+
+sim.set_optimization(opt_param_min=opt_param_min, 
+                     opt_param_max=opt_param_max,
+                     ms_max_avail_diameter=ms_max_available_diameter,
+                     phase_mask_init_size=output_fiber_core_diameter,
+                     opt_max_eval=opt_max_eval,
+                     conic_filter_radius=1.5e-6)
+
+sim.run()
+
+best_opt_val, distances = sim.get_best_opt_and_distances()
+print("Best optimization value:", best_opt_val)
+print("Distances:", distances)