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78 lines
2.5 KiB
Python
78 lines
2.5 KiB
Python
import mpid as pid
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import numpy as np
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#Space grid definition
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N = 1025
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unit_cell_pitch = 700e-9
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n0 = 1.45
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n1 = 1.0
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n2 = 1.45
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mat_refr_index = np.array([n0, n1, n2])
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d0 = 476e-6 #propagation distance: source - MS1 [m]
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d1 = 510e-6 #propagation distance: MS1 - MS2 [m]
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d2 = d0 #propagation distance: MS2 - target [m]
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d = np.array([d0, d1, d2])
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ms_max_available_diameter = 122e-6 #[um]
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output_fiber_core_diameter = 19e-6 #[um]
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opt_max_eval = 140
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space_grid = pid.SpaceGrid(
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side_pixels=N,
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unit_cell_pitch = unit_cell_pitch,
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prop_distances=d,
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materials_refr_index=mat_refr_index,
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)
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#define the source
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beam_waist = 5.2e-6
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gaussian_field = np.exp(-(space_grid.get_rho())**2 / (beam_waist)**2) #Gaussian input field, flattened
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gaussian_field_normalized = (gaussian_field / np.sqrt(np.sum(np.abs(gaussian_field)**2))) #normalize the input field to have power = 1
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wavelengths_to_test_nm = [1550] #[nm]
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central_wavelength_m = 1550 * space_grid.nm
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sources = [pid.Source(input_field=gaussian_field_normalized,
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wavelength=wvl,
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space_grid=space_grid,
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wvl_unit_measure=space_grid.nm) for wvl in wavelengths_to_test_nm]
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sources[0].plot2D(plot_zoom_x=38,plot_zoom_y=38,choose_quantity='amplitude', save_name='results/input_field')
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#define targets
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#import field data from files and create target objects
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target_files = ["fiber_modes/LP21_field_distribution_1025.npy"]
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target_fields = [np.load(file) for file in target_files]
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norm_target_fields = [field / np.sqrt(np.sum(np.abs(field)**2)) for field in target_fields]
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targets = [pid.Target(input_field=norm_target_fields[i],
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associated_source=sources[i],
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wavelength=wvl,
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space_grid=space_grid,
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wvl_unit_measure=space_grid.nm) for i, (file, wvl) in enumerate(zip(target_files, wavelengths_to_test_nm))]
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targets[0].plot2D(plot_zoom_x=38,plot_zoom_y=38,choose_quantity='amplitude', save_name='results/target_field')
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#setup the simulation instance
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simulation = pid.Simulation(
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sources=sources,
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targets=targets,
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central_wavelength=central_wavelength_m,
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space_grid=space_grid,
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n_cpu=1
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)
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simulation.set_optimization(
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opt_param_min=0,
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opt_param_max=1,
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ms_max_avail_diameter=ms_max_available_diameter,
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phase_mask_init_size=output_fiber_core_diameter/3,
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opt_max_eval=opt_max_eval,
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)
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simulation.run()
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best_opt_val, distances = simulation.get_best_opt_and_distances()
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print("Best optimization value:", best_opt_val)
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print("Distances:", distances) |