diff --git a/Classes/AWG.m b/Classes/AWG.m
index 1eb8a84..0287be6 100644
--- a/Classes/AWG.m
+++ b/Classes/AWG.m
@@ -57,7 +57,7 @@ classdef AWG
                 obj.dac_max         = 0.5;
                 obj.dac_min         = -.5;
                 obj.lowpass         = 1; %LP
-                obj.f_cutoff        = 32e9;
+                obj.f_cutoff        = 50e9;
             elseif options.preset == "M8199B"
                 %https://www.keysight.com/us/en/assets/3120-1465/data-sheets/M8199A-128-256-GSa-s-Arbitrary-Waveform-Generator.pdf
             end
diff --git a/Classes/Fiber.m b/Classes/Fiber.m
index 3e65728..9f0c3c4 100644
--- a/Classes/Fiber.m
+++ b/Classes/Fiber.m
@@ -46,9 +46,6 @@ classdef Fiber
             obj.b3 = ((obj.lambda0.^2/(2*pi*Constant.LightSpeed)).^2*obj.Dslope);
             obj.alpha_lin = obj.alpha/10*log(10)/1000;
 
-
-
-
         end
 
         function signalclass_out = process(obj,signalclass_in)
@@ -57,7 +54,7 @@ classdef Fiber
             signalclass_in.signal = obj.process_(signalclass_in.signal); 
 
              % append to logbook
-             lbdesc = ['Fiber '];
+             lbdesc = 'Fiber ';
             signalclass_in  = signalclass_in.logbookentry(lbdesc);
 
              % write to output
@@ -149,13 +146,7 @@ classdef Fiber
 
         end
 
-        function yout = process_nonlinstep(xin,stepsize)
 
-        end
-
-        function yout = process_linstep(xin,stepsize)
-
-        end
     end
 end
 
diff --git a/Classes/Signal.m b/Classes/Signal.m
index bdc666f..7ff2286 100644
--- a/Classes/Signal.m
+++ b/Classes/Signal.m
@@ -29,7 +29,6 @@ classdef Signal
             if isa(obj,'Electricalsignal')
 
                 %convert to optical
-                disp("Convert signal: elec. -> info.!");
                 varargout{1} = obj.fs;
                 i_sig = Informationsignal(obj.signal);
 
@@ -54,7 +53,6 @@ classdef Signal
             if isa(obj,'Opticalsignal')
 
                 %convert to electrical
-                disp("Convert signal: opt. -> elec. Fetch all properties (e.g. nase)!");
                 varargout{1} = obj.nase;
                 varargout{2} = obj.lambda;
                 e_sig = Electricalsignal(obj.signal,"fs",obj.fs,"logbook",obj.logbook);
diff --git a/Functions/.DS_Store b/Functions/.DS_Store
index f7b81c2..221a2c7 100644
Binary files a/Functions/.DS_Store and b/Functions/.DS_Store differ
diff --git a/comm_tb.m b/comm_tb.m
index d0452d1..00bf9c0 100644
--- a/comm_tb.m
+++ b/comm_tb.m
@@ -1,6 +1,6 @@
 clear all
 
-O = 17; %order of prbs
+O = 15; %order of prbs
 N = 2^(O-1); %length of prbs
 [~,seed] = prbs(O,1); %initialize first seed of prbs
 
@@ -19,28 +19,17 @@ fadc = 256e9;
 % Simulation frequency in "analog domain"
 fsimu = kover * fdac ;
 
-[settings, button] = settingsdlg(...
-   'Description'                        , ['This dialog will set the ', ...
-                                          'parameters used by FMINCON()'], ...
-   'title'                              , 'FMINCON() options', ...
-   'separator'                          , 'Unconstrained/General', ...
-   {'This is a checkbox'; 'Check'}      , [false, false],...
-   {'Tolerance X';'TolX'}               , 1e-6, ...
-   {'Tolerance on Function';'TolFun'}   , 1e-6, ...
-   'Algorithm'                          , {'active-set','interior-point'}, ...
-   'separator'                          , 'Constrained', ...
-   {'Tolerance on Constraints';'TolCon'}, 1e-6);
-
 %CONSTRUCTION
 pam_mapper = PAMmapper(M,0);
 
-awg = AWG('preset','M8196A','fdac',fdac,'kover',kover,'lpf_active',0);
+awg = AWG('preset','M8196A','fdac',fdac,'kover',kover,'lpf_active',0,'f_cutoff',80e9,'lpf_type',filtertypes.bessel_bilin);
 
+%fil_tx = Filter('filtdegree',1,"f_cutoff",80e9,"fsamp",fdac,"filterType",filtertypes.bessel_bilin);
 fil_tx = Filter('filtdegree',1,"f_cutoff",50e9,"fsamp",fdac,"filterType",filtertypes.bessel_bilin);
 
 u_pi = 3.5;
 vbias = (0.5*u_pi)-u_pi;
-extmodlaser = EML("mode",emlmodes.im_cosinus,"power",10,"fsimu",fsimu,"lambda",1550,"bias",vbias,"u_pi",u_pi,"linewidth",0);
+extmodlaser = EML("mode",emlmodes.im_cosinus,"power",10,"fsimu",fsimu,"lambda",1550,"bias",vbias,"u_pi",u_pi,"linewidth",1000);
 
 amp = Amplifier("amplification_db",10,"amp_mode","gain","type","ideal","saturation_mode",0,'saturation_power',10);
 
@@ -69,6 +58,8 @@ X = Informationsignal(bitpattern);
 
 PAMSIG = pam_mapper.map(X);
 
+X = PAMSIG;
+
 X.signal  = applyPulseShaping(PAMSIG.signal,fsym,fdac);
 
 % ELECTRICAL DOMAIN
@@ -92,16 +83,16 @@ X  = scp.process(X);
 
 X  = X.resample("fs_out",2*fsym,"fs_in",fadc);
 
-
 % INFORMATION SIGNAL
 X  = eq.process(X,PAMSIG);
 
 X  = pam_mapper.demap(X);
 
 % BER
-[bits,errors,BER] = calc_ber(X.signal(:,10000:end-20),bitpattern(10000:end-20,:)',0);
+[bits,errors,BER] = calc_ber(X.signal(:,10000:end-21),bitpattern(10000:end-20,:)',0);
 
 disp(['BER: ', sprintf('%2E',BER)]);
+
 disp(X.logbook);
 
 function yout = applyPulseShaping(xin,fsym,fdac)