ECOC Theroy stuff
This commit is contained in:
Silas Oettinghaus
@@ -1,34 +1,20 @@
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db = DBHandler("type","mysql","dataBase",'labor');
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fp = QueryFilter();
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% fp.where('Runs', 'run_id','EQUALS', 987);
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M = 4;
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fp.where('Runs', 'pam_level','EQUALS', M);
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fp.where('Runs', 'symbolrate','EQUALS', 112e9);
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fp.where('Runs', 'fiber_length','EQUALS', 0);
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fp.where('Runs', 'is_mpi','EQUALS', 1);
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fp.where('Runs', 'interference_path_length','EQUALS', 70);
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% fp.where('Runs', 'loop_id','GREATER_THAN', 11);
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fp.where('Runs', 'sir','EQUALS',20);
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savePath = 'Z:\2025\ECOC Silas\ecoc_2025\';
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databasePath = 'C:\Users\Silas\Documents\MATLAB\imdd_simulation\projects\ECOC_2025\';
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database_name = 'ecoc2025_loops.db';
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db = DBHandler("type","mysql");
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% db = DBHandler("pathToDB", [databasePath, database_name],"type","sqlite");
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filterParams = db.tables;
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% filterParams.Configurations = struct('run_id', run_id);
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filterParams.Configurations = struct( ...
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'symbolrate', 112e9, ... %[224,336,360,390,420,448]
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'fiber_length', 0, ...
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'db_mode', '"no_db"', ...
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'interference_attenuation', 4, ...
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'interference_path_length', 300, ...
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'is_mpi', 1, ...
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'pam_level', 4, ...
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'wavelength', 1310, ...
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'precomp_amp', [], ...
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'signal_attenuation', [], ...
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'v_awg', [], ...
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'v_bias', [] ...
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);
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selectedFields = {'Runs.run_id','Runs.tx_bits_path','Runs.tx_signal_path','Runs.tx_symbols_path','Runs.rx_sync_path','Runs.rx_raw_path',...
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'Configurations.db_mode','Configurations.pam_level','Configurations.bitrate','Configurations.symbolrate','Configurations.fiber_length','Configurations.wavelength','Configurations.precomp_amp','Measurements.power_rop','Configurations.v_bias',...
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'Configurations.interference_attenuation', 'Measurements.power_mpi_interference'};
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[dataTable,sql_query] = db.queryDB(filterParams, selectedFields);
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[dataTable,sql_query] = db.queryDB(fp, db.getTableFieldNames('Runs'));
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[~, uniqueIdx] = unique(dataTable.run_id); % Get unique run_id indices
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@@ -55,7 +41,7 @@ for i = 1:size(dataTable,1)
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Scpe_sig_raw = load([savePath, char(dataTable_.rx_raw_path(1))]);
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Scpe_sig_raw = Scpe_sig_raw.Scpe_sig_raw;
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% Scpe_sig_raw.plot("displayname",['Scope Signal (Run ID: ',num2str(dataTable_.run_id)],"fignum",dataTable_.run_id,"clear",0);
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Scpe_sig_raw.plot("displayname",['Scope Signal (Run ID: ',num2str(dataTable_.run_id)],"fignum",dataTable_.run_id,"clear",0);
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Scpe_sig_resampled = Scpe_sig_raw.resample("fs_in",Scpe_sig_raw.fs,"fs_out",fsym);
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@@ -1,49 +1,57 @@
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% basePath = 'C:\Users\Silas\Documents\MATLAB\Datensätze\sioe_labor\';
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% database = DBHandler("pathToDB",[basePath,'silas_labor.db']);
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database = DBHandler("type",'mysql','dataBase','labor');
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filterParams = database.tables;
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filterParams.Runs.loop_id = 209;
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% filterParams.Configurations = struct( ...
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% 'symbolrate', 112e9, ... %[224,336,360,390,420,448]
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% 'fiber_length', 0, ...
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% 'db_mode', '"no_db"', ...
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% 'interference_attenuation', [], ...
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% 'interference_path_length', 1000, ...
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% 'is_mpi', 1, ...
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% 'pam_level', 4, ...
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% 'wavelength', 1310, ...
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% 'precomp_amp', [], ...
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% 'signal_attenuation', [], ...
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% 'v_awg', [], ...
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% 'v_bias', [] ...
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% );
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% dsp_options.database_type = 'mysql';
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% dsp_options.dataBase = 'labor';
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% dsp_options.storage_path = 'Z:\2025\ECOC Silas\ecoc_2025\';
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% database = DBHandler("dataBase", [dsp_options.dataBase], "type", dsp_options.database_type);
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% filterParams = database.tables;
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% filterParams.Runs.loop_id = 209;
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% % filterParams.Configurations = struct( ...
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% % 'symbolrate', 112e9, ... %[224,336,360,390,420,448]
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% % 'fiber_length', 0, ...
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% % 'db_mode', '"no_db"', ...
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% % 'interference_attenuation', [], ...
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% % 'interference_path_length', 1000, ...
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% % 'is_mpi', 1, ...
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% % 'pam_level', 4, ...
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% % 'wavelength', 1310, ...
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% % 'precomp_amp', [], ...
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% % 'signal_attenuation', [], ...
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% % 'v_awg', [], ...
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% % 'v_bias', [] ...
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% % );
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%
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% % if 1
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% % % filterParams.EqualizerParameters.dc_buffer_len = 1;
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% % filterParams.EqualizerParameters.ffe_buffer_len = 1;
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% % filterParams.EqualizerParameters.smoothing_buffer_len = 4096;
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% % filterParams.EqualizerParameters.smoothing_buffer_update = 224;
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% % filterParams.EqualizerParameters.DCmu = 0;
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% % end
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% a = database.getTableFieldNames('Runs');
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% b = database.getTableFieldNames('Results');
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% c = database.getTableFieldNames('EqualizerParameters');
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% d = [a;b;c];
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%
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% [dataTable,~] = database.queryDB(filterParams, d);
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%
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% selectedFields = {'Configurations.run_id' 'Runs.loop_id' 'Runs.date_of_run' 'Runs.rx_raw_path' 'Runs.bitrate' 'Runs.v_bias' 'Runs.v_awg' 'Runs.precomp_amp' 'Runs.symbolrate' 'Runs.pam_level'...
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% 'Runs.db_mode' 'Runs.rop_attenuation' 'Runs.is_mpi' 'Runs.interference_attenuation' 'Runs.interference_path_length' 'Runs.signal_attenuation' ...
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% 'EqualizerParameters.equalizer_structure' 'EqualizerParameters.diff_precode' 'EqualizerParameters.eq_id' 'EqualizerParameters.dc_buffer_len' 'EqualizerParameters.ffe_buffer_len' 'EqualizerParameters.smoothing_buffer_len' 'EqualizerParameters.smoothing_buffer_update' 'EqualizerParameters.DCmu' 'Measurements.power_pd_in' ...
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% 'Measurements.power_mpi_interference' 'Measurements.power_mpi_signal' 'Results.BER' 'Results.BER_precoded' 'Results.EVM' 'Results.SNR' 'Results.GMI' 'Results.Alpha' 'Results.date_of_processing'};
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% if 1
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% % filterParams.EqualizerParameters.dc_buffer_len = 1;
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% filterParams.EqualizerParameters.ffe_buffer_len = 1;
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% filterParams.EqualizerParameters.smoothing_buffer_len = 4096;
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% filterParams.EqualizerParameters.smoothing_buffer_update = 224;
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% filterParams.EqualizerParameters.DCmu = 0;
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% end
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a = database.getTableFieldNames('Runs');
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b = database.getTableFieldNames('Results');
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c = database.getTableFieldNames('EqualizerParameters');
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d = [a;b;c];
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db = DBHandler("type","mysql","dataBase",'labor');
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[dataTable,~] = database.queryDB(filterParams, d);
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selectedFields = {'Configurations.run_id' 'Runs.loop_id' 'Runs.date_of_run' 'Runs.rx_raw_path' 'Runs.bitrate' 'Runs.v_bias' 'Runs.v_awg' 'Runs.precomp_amp' 'Runs.symbolrate' 'Runs.pam_level'...
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'Runs.db_mode' 'Runs.rop_attenuation' 'Runs.is_mpi' 'Runs.interference_attenuation' 'Runs.interference_path_length' 'Runs.signal_attenuation' ...
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'EqualizerParameters.equalizer_structure' 'EqualizerParameters.diff_precode' 'EqualizerParameters.eq_id' 'EqualizerParameters.dc_buffer_len' 'EqualizerParameters.ffe_buffer_len' 'EqualizerParameters.smoothing_buffer_len' 'EqualizerParameters.smoothing_buffer_update' 'EqualizerParameters.DCmu' 'Measurements.power_pd_in' ...
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'Measurements.power_mpi_interference' 'Measurements.power_mpi_signal' 'Results.BER' 'Results.BER_precoded' 'Results.EVM' 'Results.SNR' 'Results.GMI' 'Results.Alpha' 'Results.date_of_processing'};
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[dataTable_raw,sql_query] = database.queryDB(filterParams, selectedFields);
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fp = QueryFilter();
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% fp.where('Runs', 'loop_id','EQUALS', 209);
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% fp.where('Runs', 'sir','EQUALS', 21);
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fp.where('Runs', 'pam_level','EQUALS', 4);
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fn = [db.getTableFieldNames('Runs');db.getTableFieldNames('Results')];
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[dataTable,sql_query] = db.queryDB(fp,fn);
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%%
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dataTable_clean = dataTable_raw;
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dataTable_clean = dataTable;
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dataTable_clean.SIR = -7 - round(dataTable_clean.power_mpi_interference);
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dataTable_clean.NGMI = dataTable_clean.GMI ./ log2(dataTable_clean.pam_level);
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dataTable_clean = cleanUpTable(dataTable_clean);
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@@ -1,13 +1,13 @@
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% This script is used to evaluate Fig. 1b) in the paper "Adaptive Removal of Multipath Interference in Short Reach 112 GBd PAM-4 IM/DD Systems"
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%% Parameters
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df = 1e6;%150e3; % Laser linewidth [Hz]
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df = 1e6; % Laser linewidth [Hz]
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SIR_dB = 20; % Interference attenuation [dB]
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alpha = 10^(-SIR_dB/20); % Interference attenuation [linear]
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n_fiber = 1.467; % Refractive index
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c = physconst('lightspeed'); % [m/s]
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L = linspace(0,400,40); % Interference delay [m]
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L = linspace(0,250,50); % Interference delay [m]
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tau = n_fiber./c.*L; % Interference time (= tau) [s]
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tau_c = 1/(pi*df); % laser coherence time [s]
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@@ -22,7 +22,7 @@ N = round(Tsim*fs); % number of samples for each realization
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max_delay_samples = round(max(tau)*fs); % largest delay that is evaluated (based on max. Interference delay)
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phase_noise_std = sqrt(2*pi*df/fs); % standard dev. phase noise
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num_realizations = 10; % number of parallel runs
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num_realizations = 50; % number of parallel runs
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monte_carlo_variance = zeros(num_realizations, length(L));
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parfor r = 1:num_realizations
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@@ -48,7 +48,9 @@ avg_of_mc_variances = mean(monte_carlo_variance, 1);
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std_of_mc_variances = std(monte_carlo_variance, 0, 1);
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%% Analytic variance
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analytic_variance = 2*alpha^2 * (1 - exp(-2*pi*df.*tau)).^2;
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L_ = linspace(0,250,500); % Interference delay [m]
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tau_ = n_fiber./c.*L_;
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analytic_variance = 2*alpha^2 * (1 - exp(-2*pi*df.*tau_)).^2;
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%% Plot
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cols = [0.3467 0.5360 0.6907
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@@ -62,20 +64,21 @@ hold on;
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plot(L, avg_of_mc_variances, 'LineWidth',2, 'DisplayName','Simulation','Color',cols(1,:),'LineStyle','-');
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errorbar(L, avg_of_mc_variances,std_of_mc_variances, 'LineWidth',0.7,'LineStyle','none', 'DisplayName','Simulation','Color',cols(1,:),'HandleVisibility','off');
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plot(L, analytic_variance, 'LineWidth',2, 'DisplayName','Analytic','Color',cols(2,:),'LineStyle','-');
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plot(L_, analytic_variance, 'LineWidth',2, 'DisplayName','Analytic','Color',cols(2,:),'LineStyle','-');
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xticks(coherence_length_multiples.*L_c);
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xticklabels(round(coherence_length_multiples.*L_c));
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xticklabels(round(coherence_length_multiples.*L_c,1));
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norm_to_coherence_len = 1;
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if norm_to_coherence_len
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xticklabels(coherence_length_multiples);
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xlabel('$\tau_c$', 'FontSize',12);
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xlabel('$n \cdot L_c$', 'FontSize',12);
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else
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xlabel('Interference Delay [m]', 'FontSize',12);
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end
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xline(L_c.*coherence_length_multiples, 'LineWidth',1.5, 'DisplayName','Coh. Length','HandleVisibility','off','Color',[0.7,0.7,0.7],'LineStyle','-');
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xlim([0,L(end)]);
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yline(var_sat, '-.k','LineWidth',1.5, 'DisplayName','Saturation: 2$\alpha ^2$');
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xlabel('Interference Delay [m]', 'FontSize',12);
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grid on;
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ylabel('Intensity Variance', 'FontSize',12);
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title(sprintf('MPI Variance; %d MHz; SIR: %d dB',df.*1e-6,SIR_dB), 'FontSize',14);
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@@ -1,32 +1,32 @@
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%% Parameters
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df = linspace(100e3,50e6,10000); % Laser FWHM linewidth [Hz]
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df = linspace(1,50e6,10000); % Laser FWHM linewidth [Hz]
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n_fiber = 1.467; % Fiber group index
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c = 3e8; % Speed of light [m/s]
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% Compute coherence length (1/e of mean-fringe decay)
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tau_c = 1./(pi*df);
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L_c = (c/n_fiber) .* tau_c; % Coherence length [m]
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L_c = (c.* tau_c/n_fiber) ; % Coherence length [m]
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%% Plot
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figure('Color','w');
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loglog(df/1e6, L_c, 'LineWidth',2,'LineStyle','-'); % linewidth in MHz
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xticks([0.1, 1, 10, 50]);
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yticks([1, 10, 100, 1000]);
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yticklabels({'1','10','100','1000'})
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% xticks([0.1, 1, 10, 50]);
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% yticks([1, 10, 100, 1000]);
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% yticklabels({'1','10','100','1000'})
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grid on; box on;
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xlabel('Laser linewidth [MHz]','FontSize',12,'Interpreter','none');
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ylabel('Coherence length [m]','FontSize',12,'Interpreter','none');
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title('Coherence Length vs. Laser Linewidth','FontSize',14,'Interpreter','none');
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xlabel('Laser linewidth [MHz]','FontSize',12,'Interpreter','latex');
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ylabel('Coherence length [m]','FontSize',12,'Interpreter','latex');
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title('Coherence Length vs. Laser Linewidth','FontSize',14,'Interpreter','latex');
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%% Annotate some key points
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hold on;
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freqs = [150e3, 1e6, 10e6, 50e6]; % [Hz]
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for f = freqs
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x = f/1e6;
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y = (c/n_fiber) * (1/(pi*f));
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scatter(x,y,'Marker','x','LineWidth',1,'MarkerEdgeColor','black');
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text(x*1.1,y, sprintf('%.2f MHz', f/1e6), ...
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'FontSize',10,'HorizontalAlignment','left');
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end
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% hold on;
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% freqs = [150e3, 1e6, 10e6, 50e6]; % [Hz]
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% for f = freqs
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% x = f/1e6;
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% y = (c/n_fiber) * (1/(pi*f));
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% scatter(x,y,'Marker','x','LineWidth',1,'MarkerEdgeColor','black');
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%
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% text(x*1.1,y, sprintf('%.2f MHz', f/1e6), ...
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% 'FontSize',10,'HorizontalAlignment','left');
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%
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% end
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