O-band Amp Characterization Measurement

2025-12-18 09:56:52 +01:00
parent 08e3e00698
commit ec6f5eda86
23 changed files with 960 additions and 26 deletions
--- a/projects/Lab_analysis/amplifier_characterization.m
+++ b/projects/Lab_analysis/amplifier_characterization.m
@@ -0,0 +1,127 @@
+% Silas Amplifier characterization
+
+laser = Exfo_laser("mainframe_channel",1,"safety_mode",0,"connection_id",'10','lab_interface','gpib');
+laser.getLaserInfo();
+laser.disableLaser;
+laser.setWavelength(1310);
+laser.enableLaser;
+
+% pm = OptPowerMeter8153A("active",[0,1],"wavelength_nm",[1550,1310]);
+% pm.readPower
+
+% pdfa = Thor_PDFA();
+%%
+params.laserpower   = [-30,-20,-10,0];
+params.lambda       = [1260:5:1360]; %calcWavelengthPlan(16, 400e9 , 1310);
+params.pump         = [50,75,100];
+
+wh = DataStorage(params);
+wh.addStorage("spectrum_osa");
+wh.addStorage("wavelength_osa");
+wh.addStorage("psig_osa");
+wh.addStorage("pase_osa");
+wh.addStorage("osnr_osa");
+wh.addStorage("amp_gain");
+wh.addStorage("psig_total");
+
+cols = linspecer(numel(params.laserpower));
+ccnt = 0;
+for p = params.laserpower
+    ccnt=ccnt+1;
+    laser.setWavelength(params.lambda(1));
+    usrcmd = sprintf('Laser to %d dBm',p);
+    waitUntilClick('Text',usrcmd);
+
+    for pmp = params.pump
+        % pdfa.setPumpLevel(pmp);
+        usrcmd = sprintf('Amp to %d mA',2*pmp);
+        waitUntilClick('Text',usrcmd);
+
+        for w = params.lambda
+            laser.setWavelength(w)
+            % pm.setWavelength([1550, w]);
+            span_nm     = 5;
+            lambda_c_nm = w;
+            osa = OSA_Advantest( ...
+                'span_nm',        40, ...
+                'lambda_c_nm',    w, ...
+                'resolution_nm',  0.1, ...
+                'sampling_points', 1001 );
+            osa.configure();
+
+
+
+            % OSA
+            [lambda_nm, psd_dBm] = osa.measure();
+            osnr = osa.computeOSNR('bw_signal_nm',0.01,'ref_bw_nm',0.1,'debugplots',0,...
+                'carrier_frequency',w,'noise_guard_nm',1,'noise_window_nm',1);
+
+            osa.plot("FigureNumber",pmp+1,"Color",cols(ccnt,:));
+            xlabel('Wavelength [nm]');
+            ylabel('Opt. Spectrum [dBm]');
+            xlim([params.lambda(1)-5 params.lambda(end)+5])
+            grid minor
+
+            % Powermeter
+            totalpower=10*log10(sum(10.^(psd_dBm./10)));
+            % [totalpower]=pm.readPower;
+            % totalpower=totalpower(2) + 20; %20dB attenuation with eigenlight to satisfy 3dB max of PMeter
+
+            wh.addValueToStorage(lambda_nm,'wavelength_osa',p,w,pmp);
+            wh.addValueToStorage(psd_dBm,'spectrum_osa',p,w,pmp);
+            wh.addValueToStorage(osnr.p_ase_db,'pase_osa',p,w,pmp);
+            wh.addValueToStorage(osnr.p_sig_db,'psig_osa',p,w,pmp);
+            wh.addValueToStorage(osnr,'osnr_osa',p,w,pmp);
+            wh.addValueToStorage(totalpower,'psig_total',p,w,pmp);
+
+        end
+    end
+
+    % before tuning all the way back to 1270nm set PDFA off
+    % pdfa.setPumpLevel(0);
+    % pdfa.disablePDFA;
+end
+
+
+
+
+%% OSNR
+
+figure(2);hold on
+for p = [-30:10:0]
+    pmp = 100;
+    osnr = wh.getStoValue('osnr_osa',p,params.lambda,pmp);
+    osnr_measured_dB = cellfun(@(x) x.measured_dB, osnr);
+    osnr_direct_dB = cellfun(@(x) x.direct_dB, osnr);
+    plot(params.lambda,osnr_direct_dB,'DisplayName',sprintf('P_{in}: %d dB ',p));
+end
+legend
+
+%% P out
+
+figure(3);hold on
+for p = [-30:10:0]
+    pmp = 100;
+    psig_osa = wh.getStoValue('psig_osa',p,params.lambda,pmp)+3;
+    pl=plot(params.lambda,psig_osa,'DisplayName',sprintf('P_{signal}: %d dB ',p));
+
+    psig_powermeter = wh.getStoValue('psig_total',p,params.lambda,pmp)+3;
+    plot(params.lambda,psig_powermeter,'DisplayName',sprintf('P_{total}: %d dB ',p),'LineStyle','--','Color',pl.Color);
+
+    yline(p,'Color',pl.Color,'DisplayName',sprintf('P_{total}: %d dB ',p));
+end
+legend
+
+%% GAIN
+
+figure(3);hold on
+for p = [-30:10:0]
+
+    pmp = 50;
+    psig_osa = wh.getStoValue('psig_osa',p,params.lambda,pmp);
+    % psig_powermeter = wh.getStoValue('psig_powermeter',p,params.lambda,pmp);
+
+    g = psig_osa-p;
+    pl=plot(params.lambda,g,'DisplayName',sprintf('P_{in}: %d dB ',p));
+end
+legend