Pform = Pulseformer("fsym",fsym,"fdac",4*fsym,"pulse","rrc","pulselength",16,"rrcalpha",rcalpha);

    [Digi_sig,Symbols,Tx_bits] = PAMsource(...
        "fsym",fsym,"M",M,"order",19,"useprbs",1,...
        "fs_out",fdac,...
        "applyclipping",0,"clipfactor",1.5,...
        "applypulseform",apply_pulsef,"pulseformer",Pform,...
        "randkey",random_key,...
        "db_precode",db_precode,"db_encode",db_encode,...
        "mrds_code",0,"mrds_blocklength",512).process();

    % Digi_sig.spectrum("displayname",'Digi Spectrum','fignum',10,'normalizeTo0dB',1);

    %%%%% AWG
    % El_sig = M8199A("kover",kover).process(Digi_sig);
    El_sig = AWG("fdac",fdac,"f_cutoff",fsym,"lpf_active",0,"kover",kover,"bit_resolution",12,"upsampling_method","samplehold","precomp_sinc_rolloff",1).process(Digi_sig);
    % El_sig.spectrum("displayname",'Digi Spectrum','fignum',100,'normalizeTo0dB',0);
    % El_sig = El_sig.setPower(0,"dBm");

    %%%%% Low-pass el. components %%%%%%
    El_sig = Filter('filtdegree',4,"f_cutoff",tx_bw_nyquist.*f_nyquist,"fs",fdac*kover,"filterType",filtertypes.butterworth,"active",true).process(El_sig);

    %%%%% Electrical Driver Amplifier %%%%%%
    El_sig = Amplifier("amp_mode","ideal_no_noise","gain_mode","gain","amplification_db",3).process(El_sig);
    El_sig = El_sig.normalize("mode","oneone");

    %%%%% MODULATE E/O CONVERSION %%%%%%
    [Opt_sig] = EML("mode",eml_mode.im_cosinus,"power",3,"fsimu",El_sig.fs,"lambda",laser_wavelength,"bias",vbias,"u_pi",u_pi,"linewidth",laser_linewidth,"randomkey",random_key+1).process(El_sig);