92 lines
2.3 KiB
Matlab
92 lines
2.3 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 = 92e9;%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",0.2).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',5,"f_cutoff",64e9,"fs",fdac*kover,"filterType",filtertypes.butterworth);
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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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plot_eye(X.signal,X.fs,fsym);
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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 = -1.8;
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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(22);
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tiledlayout(2,2);
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nexttile
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hold on
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scatter(X.signal(1:100000),(abs(Opt.signal(1:100000)).^2)*1e3,0.1,'.','DisplayName','Modulator TF')
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xlabel('Input in V')
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ylabel('Output in mW')
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nexttile
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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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nexttile
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spectrum_plot(Opt.signal,Opt.fs);
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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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end
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