EME: Taper
The simplest EMode example of an EME simulation.
This code example is licensed under the BSD 3-Clause License.
import emodeconnection as emc
## Set simulation parameters
wavelength = 1550 # [nm] wavelength
dx, dy = 20, 20 # [nm] resolution
h_core = 220 # [nm] waveguide core height
h_clad = 1000 # [nm] waveguide top and bottom clad
window_width = 3400
window_height = h_core + h_clad*2
num_modes = 22 # [-] number of modes
BC = 'TE'
## Connect and initialize EMode
em = emc.EMode(verbose = True)
## Settings
em.settings(
wavelength = wavelength, x_resolution = dx, y_resolution = dy,
window_width = window_width, window_height = window_height,
num_modes = num_modes, boundary_condition = BC,
background_material = 'SiO2')
## Draw shapes
em.shape(name = 'BOX', material = 'SiO2',
height = h_clad)
em.shape(name = 'core', material = 'Si',
height = h_core, etch_depth = h_core*0.90,
sidewall_angle = 10)
## Launch FDM solver and label profiles
em.shape(name = 'core', mask = 1000)
em.FDM(profile = 'a')
em.report()
em.plot()
em.shape(name = 'core', mask = 2000)
em.FDM(profile = 'b')
em.report()
em.plot()
## Draw EME sections
em.section(profile = 'a', section_type = 'straight',
length = 2e3)
em.section(section_type = 'taper',
profile = 'a', profile_end = 'b',
length = 4000)
em.section(profile = 'b', section_type = 'straight',
length = 2e3)
## Run EME and plot results
em.EME()
em.plot()
em.plot_S_matrix()
## Close EMode
em.close()
%% Set simulation parameters
wavelength = 1550; % [nm] wavelength
dx = 20; dy = 20; % [nm] resolution
h_core = 220; % [nm] waveguide core height
h_clad = 1000; % [nm] waveguide top and bottom clad
window_width = 3400;
window_height = h_core + h_clad*2;
num_modes = 22; % [-] number of modes
BC = 'TE';
%% Connect and initialize EMode
em = emodeconnection(verbose = true);
%% Settings
em.settings( ...
wavelength = wavelength, x_resolution = dx, y_resolution = dy, ...
window_width = window_width, window_height = window_height, ...
num_modes = num_modes, boundary_condition = BC, ...
background_material = 'SiO2');
%% Draw shapes
em.shape(name = 'BOX', material = 'SiO2', ...
height = h_clad);
em.shape(name = 'core', material = 'Si', ...
height = h_core, etch_depth = h_core*0.90, ...
sidewall_angle = 10);
%% Launch FDM solver and label profiles
em.shape(name = 'core', mask = 1000);
em.FDM(profile = 'a');
em.report();
em.plot();
em.shape(name = 'core', mask = 2000);
em.FDM(profile = 'b');
em.report();
em.plot();
%% Draw EME sections
em.section(profile = 'a', section_type = 'straight', ...
length = 2e3);
em.section(section_type = 'taper', ...
profile = 'a', profile_end = 'b', ...
length = 4000);
em.section(profile = 'b', section_type = 'straight', ...
length = 2e3);
%% Run EME and plot results
em.EME();
em.plot();
em.plot_S_matrix();
%% Close EMode
em.close();
Console output:
EMode 0.2.2 - email
Connected on port 62000 to LM-1.
Meshing completed in 0.2 sec
Solving completed in 0.6 sec
Wavelength: 1550.0 nm
Mode # n_eff TE % Loss (dB/m)
-------- -------- ------ -------------
TE-0 2.740878 99.8 % 0.000
TE-1 1.834948 86.3 % 0.000
TM-2 1.648371 14.6 % 0.000
TE-3 1.480289 99.8 % 0.000
TM-4 1.444024 0.0 % 0.000
TE-5 1.380997 99.0 % 0.000
TM-6 1.333974 3.8 % 0.000
TE-7 1.313224 98.9 % 0.000
TM-8 1.260780 9.1 % 0.000
TE-9 1.245872 93.8 % 0.000
TE-10 1.205712 96.3 % 0.000
TE-11 1.141695 98.8 % 0.000
TM-12 1.098826 2.3 % 0.000
TM-13 1.059658 6.2 % 0.000
TE-14 1.046256 99.4 % 0.000
TE-15 0.908818 90.9 % 0.000
TM-16 0.884647 13.2 % 0.000
TE-17 0.836617 92.4 % 0.000
TM-18 0.750209 29.3 % 0.000
TE-19 0.712955 92.6 % 0.000
TM-20 0.639715 17.8 % 0.000
TE-21 0.557145 76.4 % 0.000
Meshing completed in 0.2 sec
Solving completed in 0.3 sec
Wavelength: 1550.0 nm
Mode # n_eff TE % Loss (dB/m)
-------- -------- ------- -------------
TE-0 2.820614 100.0 % 0.000
TE-1 2.601685 99.7 % 0.000
TE-2 2.117344 97.1 % 0.000
TM-3 1.937158 5.2 % 0.000
TM-4 1.565193 21.8 % 0.000
TE-5 1.512582 84.1 % 0.000
TM-6 1.444024 0.0 % 0.000
TE-7 1.394522 95.1 % 0.000
TM-8 1.347977 40.3 % 0.000
TE-9 1.316026 64.5 % 0.000
TE-10 1.267170 86.3 % 0.000
TE-11 1.248576 81.1 % 0.000
TM-12 1.193778 18.6 % 0.000
TE-13 1.145446 99.4 % 0.000
TM-14 1.079657 7.7 % 0.000
TE-15 1.058558 76.3 % 0.000
TM-16 1.046977 21.7 % 0.000
TE-17 0.990949 95.2 % 0.000
TE-18 0.865006 79.2 % 0.000
TM-19 0.847538 5.0 % 0.000
TM-20 0.837589 11.2 % 0.000
TE-21 0.736539 90.2 % 0.000
Solving S-matrices...
Solving section: 1... Solving completed in 0.4 sec
Meshing completed in 0.2 sec
completed in 0.7 sec
Meshing completed in 0.2 sec
Solving completed in 0.4 sec
Solving section: 2... Solving completed in 0.3 sec
Meshing completed in 0.2 sec
Solving completed in 0.3 sec
Solving completed in 0.3 sec
Solving completed in 0.3 sec
Solving completed in 0.3 sec
Solving completed in 0.3 sec
Solving completed in 0.4 sec
Solving completed in 0.3 sec
Solving completed in 0.3 sec
Solving completed in 0.4 sec
Solving completed in 0.3 sec
Solving completed in 0.3 sec
Solving completed in 0.3 sec
Solving completed in 0.3 sec
Solving completed in 0.3 sec
Solving completed in 0.3 sec
Solving completed in 0.4 sec
completed in 11.6 sec
Meshing completed in 0.2 sec
Solving completed in 0.3 sec
Solving section: 3... Solving completed in 0.3 sec
Meshing completed in 0.2 sec
completed in 0.7 sec
completed in 16.2 sec
Figures:
