117 lines
3.5 KiB
Matlab
117 lines
3.5 KiB
Matlab
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% datarate = 128e9;
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M = 4;
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laser_linewidth = 0;
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kover = 32;
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fsym = 170e9;%round(datarate*1e-9 / log2(M))*1e9;
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fdac = 256e9;
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% 1) PRBS Generation
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O = 18; %order of prbs
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N = 2^(O-1); %length of prbs
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[~,seed] = prbs(O,1); %initialize first seed of prbs
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bitpattern=[];
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for i = 1:log2(M)
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[bitpattern(:,i),seed] = prbs(O,N,seed);
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end
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if M == 6
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bitpattern = reshape(bitpattern,[],1);
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bitpattern = bitpattern(1:end-mod(length(bitpattern),5));
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end
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bits = Informationsignal(bitpattern);
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% 2) Digi modulation -> PAM-M signal
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digimod_out = PAMmapper(M,0).map(bits);
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digimod_out.fs = fsym;
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% 3) Pulseform Raised Cosine
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X = Pulseformer("fsym",fsym,"fdac",fdac,"pulse","rrc","pulselength",16,"rrcalpha",0.01).process(digimod_out);
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% Implememt Precompensation
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% Implement Precoding
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% 4) AWG (lowpass, quantization, sample and hold)
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LP_awg = Filter('filtdegree',4,"f_cutoff",75e9,"fs",fdac*kover,"filterType",filtertypes.gaussian);
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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");
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X = AWG_.process(X);
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disp(['El. power: ',num2str(X.power),' dBm (into 50 Ohm)']);
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disp(['El. RMS voltage: ',num2str(sqrt(mean(X.signal.^2))),' V']);
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disp(['max voltage: ',num2str(max(X.signal)),' V']);
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% 5) Lowpass behavior before laser
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LP_modulator= Filter('filtdegree',4,"f_cutoff",70e9,"fs",fdac*kover,"filterType",filtertypes.butterworth);
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X = LP_modulator.process(X);
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% 6) Laser; Modulation -> OPTICAL DOMAIN
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u_pi = 4;
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vbias = 2;
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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);
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[Opt,extmodlaser] = extmodlaser.process(X);
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if 1
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f = figure(120);
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f.Name = 'bla';
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tiledlayout(2,4);
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nexttile
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rms_ = rms(X.signal);
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max_ = max(X.signal);
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min_ = min(X.signal);
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hold on
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plot(X.signal,'LineWidth',0.1);
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yline([max_, min_],'LineWidth',2,'LineStyle','--');
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yline([rms_, -rms_],'LineWidth',2,'LineStyle',':');
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ylim([-3 3]);
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title(['AWG output: ',num2str(X.power), 'dBm']);
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% Add text boxes for MIN, MAX, and RMS voltage
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text(0.5, min_-0.3, ['MIN: ', num2str(min_),' V'],'FontSize', 10, 'HorizontalAlignment', 'left');
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text(0.5, max_+0.3, ['MAX: ', num2str(max_),' V'],'FontSize', 10, 'HorizontalAlignment', 'left');
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text(0.5, rms_+0.22, ['RMS: ', num2str(rms_),' V'],'FontSize', 10, 'HorizontalAlignment', 'left');
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text(0.5, -rms_-0.22, ['RMS: ', num2str(rms_),' V'],'FontSize', 10, 'HorizontalAlignment', 'left');
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nexttile
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plot_eye(X.signal,X.fs,fsym);
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ylabel('Signal in V')
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nexttile
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hold on
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v_in_curve = [-u_pi*1.5/2:0.1:u_pi*1.5/2];
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field=sqrt(10^(extmodlaser.power/10-3));
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mzm_curve = ((field.*cos(pi/2*(real(v_in_curve)+vbias)/u_pi)).^2)*1e3;
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scatter(v_in_curve+vbias,mzm_curve,10,'o','filled','DisplayName','Modulator TF complete');
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scatter(X.signal(1:100000)+vbias,(abs(Opt.signal(1:100000)).^2)*1e3,0.1,'.','DisplayName','Modulator TF')
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scatter(min_+vbias,((field.*cos(pi/2*(real(min_)+vbias)/u_pi)).^2)*1e3,50,'x','LineWidth',2);
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scatter(max_+vbias,((field.*cos(pi/2*(real(max_)+vbias)/u_pi)).^2)*1e3,50,'x','LineWidth',2);
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xlim([-u_pi*1.5/2+vbias, u_pi*1.5/2+vbias]);
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ylim([min(mzm_curve),max(mzm_curve)]);
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xlabel('Input in V')
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ylabel('Output in mW')
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title("MZM input (v) to output (w)");
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nexttile
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plot_eye(abs(Opt.signal.^2).*1e3 ,Opt.fs,fsym);
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ylabel('Opt. Signal in mW')
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nexttile([1 2])
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spectrum_plot( Opt.signal,Opt.fs, 'bla');
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end
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