updates of framework

- focus on AWG output power and lowpass characteristics

test/modulator_test.m

@@ -0,0 +1,105 @@
+
+datarate = 112e9;
+M = 6;
+laser_linewidth = 0;
+kover = 32;
+fsym = round(datarate*1e-9 / log2(M))*1e9;
+fdac = 256e9;
+
+% 1) PRBS Generation
+O = 18; %order of prbs
+N = 2^(O-1); %length of prbs
+[~,seed] = prbs(O,1); %initialize first seed of prbs
+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
+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);
+
+% plot_eye(X.signal,X.fs,fsym);
+% 5) AWG (lowpass, quantization, sample and hold)
+X = AWG_.process(X);
+
+f=figure(12);
+f.Name = 'spectrum';
+spectrum_plot(X.signal,X.fs,'spectrum');
+
+figure(4)
+LP_awg.showHere();
+
+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
+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;
+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);
+
+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)']);
+
+[Opt,extmodlaser] = extmodlaser.process(E);
+
+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')
+
+
+
+
+
+
+

test/test_modulation.m

@@ -0,0 +1,36 @@
+
+
+
+
+O = 10; %order of prbs
+N = 2^(O-1); %length of prbs
+[~,seed] = prbs(O,1); %initialize first seed of prbs
+bitpattern=[];
+M=6;
+
+for i = 1:log2(M)
+    [bitpattern(:,i),seed] = prbs(O,N,seed);
+end
+
+if M == 6
+    bitpattern = reshape(bitpattern,[],1);
+end
+
+% [bitpattern,seed] = prbs(O,N,seed);
+% % 
+% bitpattern = bitpattern';
+
+% 2 ) Build Inf. signal class
+bits = Informationsignal(bitpattern);
+
+
+% 3) Digi modulation -> PAM-M signal
+digimod_out     = PAMmapper(M,0).map(bits);
+
+Rx_Bits         = PAMmapper(M,0).demap(digimod_out);
+
+[~,errors_bm,BER,errors] = calc_ber(Rx_Bits.signal,bitpattern,"skip_front",0,"skip_end",0,"returnErrorLocation",1);
+
+formatted_ber = sprintf('%.1e', BER);
+disp(['BER: ',formatted_ber]);
+