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Classes/01_transmit/AWG.m

@@ -74,7 +74,7 @@ classdef AWG
             
             % normalize to 0dBm before applying the lowpass
             %signalclass_in = signalclass_in.normalize("mode","milliwatt");
-            signalclass_in = signalclass_in.setPower(12,"dBm");
+            signalclass_in = signalclass_in.setPower(6,"dBm");
 
             % 4. Apply LPF on the signal
             if obj.lpf_active
@@ -89,7 +89,7 @@ classdef AWG
                 end
             end
             
-
+            signalclass_in.power
             
             % append to logbook
             current_class = class(obj);

test/modulator_test.m

@@ -1,9 +1,9 @@
 
-datarate = 112e9;
-M = 6;
+% datarate = 128e9;
+M = 4;
 laser_linewidth = 0;
 kover = 32;
-fsym = round(datarate*1e-9 / log2(M))*1e9;
+fsym = 92e9;%round(datarate*1e-9 / log2(M))*1e9;
 fdac = 256e9;
 
 % 1) PRBS Generation
@@ -15,87 +15,73 @@ bitpattern=[];
 for i = 1:log2(M)
     [bitpattern(:,i),seed] = prbs(O,N,seed);
 end
-
 if M == 6
     bitpattern = reshape(bitpattern,[],1);
     bitpattern = bitpattern(1:end-mod(length(bitpattern),5));
 end
-
-% 2 ) Build Inf. signal class
 bits = Informationsignal(bitpattern);
 
-
-alphas = flip([0.01,0.05,0.1,0.2,0.3,0.4]);
-LP_awg = Filter('filtdegree',5,"f_cutoff",70e9,"fs",fdac*kover,"filterType",filtertypes.butterworth);
-AWG_=AWG("fdac",fdac,"dac_min",-1,"dac_max",1,"H_lpf",LP_awg,"kover",kover,"bit_resolution",16,"lpf_active",1,"normalize2dac",1,"upsampling_method","samplehold");
-
-
-% 3) Digi modulation -> PAM-M signal
+% 2) Digi modulation -> PAM-M signal
 digimod_out = PAMmapper(M,0).map(bits);
 digimod_out.fs = fsym;
 
-X = Pulseformer("fsym",fsym,"fdac",fdac,"pulse","rrc","pulselength",16,"rrcalpha",alphas(a)).process(digimod_out);
+% 3) Pulseform Raised Cosine
+X = Pulseformer("fsym",fsym,"fdac",fdac,"pulse","rrc","pulselength",16,"rrcalpha",0.2).process(digimod_out);
 
-% plot_eye(X.signal,X.fs,fsym);
-% 5) AWG (lowpass, quantization, sample and hold)
+% Implememt Precompensation
+
+% Implement Precoding
+
+% 4) AWG (lowpass, quantization, sample and hold)
+LP_awg = Filter('filtdegree',5,"f_cutoff",64e9,"fs",fdac*kover,"filterType",filtertypes.butterworth);
+AWG_=AWG("fdac",fdac,"dac_min",-1,"dac_max",1,"H_lpf",LP_awg,"kover",kover,"bit_resolution",16,"lpf_active",1,"normalize2dac",1,"upsampling_method","samplehold");
 X = AWG_.process(X);
-
-f=figure(12);
-f.Name = 'spectrum';
-spectrum_plot(X.signal,X.fs,'spectrum');
-
-figure(4)
-LP_awg.showHere();
-
+plot_eye(X.signal,X.fs,fsym);
 disp(['El. power: ',num2str(X.power),' dBm (into 50 Ohm)']);
 disp(['El. RMS voltage: ',num2str(sqrt(mean(X.signal.^2))),' V']);
 disp(['max voltage: ',num2str(max(X.signal)),' V']);
 
-rms_ = rms(X.signal);
-max_ = max(X.signal);
-min_ = min(X.signal);
-figure(1);
-hold on
-plot(X.signal,'LineWidth',0.1);
-yline([max_, min_],'LineWidth',2,'LineStyle','--');
-yline([rms_, -rms_],'LineWidth',2,'LineStyle',':');
-ylim([-3 3]);
-title(['AWG output: ',num2str(X.power), 'dBm']);
-
-f=figure(12);
-f.Name = 'spectrum';
-spectrum_plot(X.signal,X.fs,'spectrum');
-
-% 6) Lowpass behavior before laser
+% 5) Lowpass behavior before laser
 LP_modulator= Filter('filtdegree',4,"f_cutoff",70e9,"fs",fdac*kover,"filterType",filtertypes.butterworth);
 X =  LP_modulator.process(X);
 
-
-% 7) Normalize signal to 0dB rms
-figure(1);subplot(1,2,1);plot(X.signal,'LineWidth',0.1);ylim([-3 3]);title(['AWG output: ',num2str(X.power), 'dBm into 50 Ohm']);
-
-% 1) Laser; Modulation ->  OPTICAL DOMAIN
-u_pi = 2;
-vbias = -1;
+% 6) Laser; Modulation ->  OPTICAL DOMAIN
+u_pi = 4;
+vbias = -1.8;
 extmodlaser = EML("mode",eml_mode.im_cosinus,"power",0,"fsimu",X.fs,"lambda",1290,"bias",vbias,"u_pi",u_pi,"linewidth",laser_linewidth,"randomkey",5);
+[Opt,extmodlaser] = extmodlaser.process(X);
 
-E = X.normalize("mode","oneone");
-figure(1);subplot(1,2,2);plot(E.signal,'LineWidth',0.1);ylim([-3 3]);title(['scaled to modulator; ',num2str(E.power), 'dBm']);
-disp(['El. power: ',num2str(E.power),' dBm (into 50 Ohm)']);
+if 1
+    f = figure(22);
+    tiledlayout(2,2);
+    nexttile
+    hold on
+    scatter(X.signal(1:100000),(abs(Opt.signal(1:100000)).^2)*1e3,0.1,'.','DisplayName','Modulator TF')
+    xlabel('Input in V')
+    ylabel('Output in mW')
 
-[Opt,extmodlaser] = extmodlaser.process(E);
+    nexttile
+    hold on
+    plot(X.signal,'LineWidth',0.1);
+    yline([max_, min_],'LineWidth',2,'LineStyle','--');
+    yline([rms_, -rms_],'LineWidth',2,'LineStyle',':');
+    ylim([-3 3]);
+    title(['AWG output: ',num2str(X.power), 'dBm']);
+
+
+    nexttile
+    spectrum_plot(Opt.signal,Opt.fs);
+    
+    
+    rms_ = rms(X.signal);
+    max_ = max(X.signal);
+    min_ = min(X.signal);
+    
+
+end
 
-f=figure(12);
-f.Name = 'spectrum';
-spectrum_plot(X.signal,X.fs,'spectrum');
 
-plot_eye(E.signal,E.fs,fsym);
 
-figure(111)
-hold on
-scatter(E.signal(1:100000),(abs(Opt.signal(1:100000)).^2)*1e3,0.1,'.','DisplayName','Modulator TF')
-xlabel('Input in V')
-ylabel('Output in mW')