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What does the effect of if 'Signal parameters' in the code Run_my_PDM_QPSK.m. It seems not work on the matlab.
If you see this, Please reply me when you have time.

Hello Paolo Serena,
I have just downloaded your codes, and they are very usefull and helpfull for my studying.
Here I have a little doubt about the lasersource.m.. Codesfrom row 182 to row 195 is the simulation of laser phase noise, I can understand the frist part:
freq_noise = (ones(nfft,1) * sqrt(2pilinewidth./GSTATE.NT)) .* randn( nfft, nch);
freq_noise(1) = 0;
phase_noise = cumsum(freq_noise,1);

but I dont know why the next part is in need:
% Brownian bridge
for nnoise=1:length(phase_noise)
phase_noise(nnoise)=phase_noise(nnoise)-(nnoise-1)/...
(length(phase_noise)-1)*phase_noise(end);
end

I dont understand why to force the initial phase and final phase to zero.
Could u please provide some papers or references about the part?