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function mx_sweep(sweeps,run_on){
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#addsweep(0);
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## NOTICE : this can only be used in one-dimentional result calculation
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## NOTICE : such as [T .vs. lambda]
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#### @ sweeps: struct ####
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#### @ sweeps: [var_names={'width','radius','wavelength'...}]
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#### @ sweeps: width = [w1:dw:w2]
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#### @ radius = [r1:dr:r2]
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addsweep(0);
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sweep_name = 'mx_sweep';
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deletesweep(sweep_name);
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setsweep("sweep", "name", sweep_name);
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setsweep(sweep_name,"type","Ranges");
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ins_temp = 'var_temp = sweeps.' + sweeps.var_names{1} + ';';
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eval(ins_temp);
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setsweep(sweep_name,"number of points",length(var_temp));
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result_data = zeros(length(var_temp),length(sweeps.result_names));
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for (idx_vars=1;idx_vars<=length(sweeps.var_names);idx_vars=idx_vars+1){
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para = struct;
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para.Name = sweeps.var_names{idx_vars};
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para.Type = sweeps.var_types{idx_vars};
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para.Parameter = sweeps.var_select{idx_vars};
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ins_temp = 'var_temp = sweeps.' + sweeps.var_names{idx_vars} + ';';
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eval(ins_temp);
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para.Start = var_temp(1);
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para.Stop = var_temp(end);
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addsweepparameter(sweep_name, para);
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}
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for (idx_rsult=1;idx_rsult<=length(sweeps.result_names);idx_rsult=idx_rsult+1){
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result = struct;
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result.Name = sweeps.result_names{idx_rsult};
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result.Result = sweeps.result_select{idx_rsult};
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addsweepresult(sweep_name, result);
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}
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if (run_on) {
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runsweep;
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for (idx_result=1;idx_result<=length(sweeps.result_names);idx_result=idx_result+1){
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result_data(:,idx_result) = getsweepdata(sweep_name,sweeps.result_names{idx_result});
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}
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}
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################################### RESULT ##################################################
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sweep_cur = sweeps;
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sweep_cur.result = result_data;
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return sweep_cur;
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}
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##### FWM analysis lib #####
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##### FWM calculation pack #####
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##### @ freq_pump : pumping frequency, vector of 1*2
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##### @ freq_signal: signal frequency, single scalar
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##### @ mode_idx : vector of 1*4, [p,p,l,s] denoted
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##### @ mode_pol : vector of 1*4, [p,p,l,s] denoted
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##### @ wg: struct of {width, bend radius}
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##### @ ONLY operates in FDE !!!! #####
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function mx_FWM_analysis(freq_pump,freq_signal,mode_idx,mode_pol,wg_bend){
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##### Select the target modes #####
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freq_idler = freq_pump(1) + freq_pump(2) - freq_signal;
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freq_range = [freq_pump,freq_signal,freq_idler];
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mode_neff = zeros(1,4);
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for (idx_mode=1;idx_mode<=4;idx_mode=idx_mode+1){
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temp = mx_get_mode_data(c/freq_range(idx_mode),mode_pol{idx_mode},mode_idx(idx_mode),wg_bend,{'neff'});
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mode_neff(idx_mode) = temp.neff;
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}
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wavelengths = c/freq_range;
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wl_neff = wavelengths/mode_neff;
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k_vector = 2*pi/wl_neff;
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phase_mismatch = sum(k_vector*[1,1,-1,-1]);
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return phase_mismatch;
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}
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##### Phase Matched Coupler calculation pack #####
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##### NOTICE : this is coupled by TE0/TM0 by default #####
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function mx_DC_analysis(wafer,width_seed,wl,gap,neff,bend,outer_side,mode_idx,mode_pol){
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cur_file_name = currentfilename;
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#load('Temp_workspace.lms');
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switchtolayout;
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#deleteall;
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cladding = wafer.cladding;
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max_itn = 5;
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mesh_grids = [20,20,20]*1e-9;
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##### Adding two waveguides to the strcuture #####
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#mx_FDE_strip(wafer,width_seed);
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#mx_simu_area('FDE_y',[0,0,0],[7e-6,10e-6,3e-6],2,mesh_grids,'Metal',10000);
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width_cur = width_seed;
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neff_sweep = mx_get_mode_data(wl,mode_pol,0,bend,{'neff'});
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run;
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setanalysis('use max index',0);
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setanalysis('n',neff_sweep.neff);
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findmodes;
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width_step = 0.002e-6;
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for (itn=1;itn<=max_itn;itn=itn+1){
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width_delta = [-0.01:0.002:0.01]*1e-6;
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width_sweep = width_cur+width_delta;
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radius_sweep = width_sweep/2 + gap + outer_side;
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#### Adding single sweep ####
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if (bend>0){
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sweeps = struct;
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sweeps.var_names = {'width','radius'};
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sweeps.radius = radius_sweep;
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sweeps.width = width_sweep;
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sweeps.var_select = {'::model::waveguide::x span','::model::FDE::bend radius'};
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sweeps.var_types = {'Length','Length'};
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sweeps.result_names = {'TE0_neff'};
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sweeps.result_select = {'::model::FDE::data::mode'+num2str(mode_idx)+'::neff'};
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sweeps.bound_para_idx = [1,2];
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neff_data = mx_sweep(sweeps,1);
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neff_data = abs(neff_data.result);
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mismatch = neff*bend - neff_data*radius_sweep;
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}
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else {
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sweeps = struct;
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sweeps.var_names = {'width'};
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sweeps.width = width_sweep;
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sweeps.var_select = {'::model::WG::x span'};
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sweeps.var_types = {'Length'};
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sweeps.result_names = {'TE0_neff'};
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sweeps.result_select = {'::model::FDE::data::mode'+num2str(mode_idx)+'::neff'};
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sweeps.bound_para_idx = [1];
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neff_data = mx_sweep(sweeps,1);
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neff_data = abs(neff_data.result);
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mismatch = neff - neff_data;
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}
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if ((mismatch(1)*mismatch(end)) <=0) {
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idx_match = find(abs(mismatch) == min(abs(mismatch)));
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itn = max_itn + 1;
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}
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else {
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delta_match = mismatch(1) - mismatch(end);
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cent_match = (mismatch(1) + mismatch(end))/2;
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delta_width = (width_delta(1)-width_delta(end))/delta_match*cent_match;
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width_cur = width_cur - delta_width;
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width_cur = round(width_cur/width_step)*width_step;
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print(width_cur);
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}
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}
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#matched_width = width_sweep(idx_match);
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return width_sweep(idx_match);
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load(cur_file_name);
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}
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