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Hi Damian Marek,

Thank you for the quick response. Info was helpful.

Yes i want to know both of them “plotting the BER vs Eye height and how it relies on the decision instant and plotting the BER vs Eye height for systems with different noise levels or laser powers”

To make it more clear. Am doing my project on “Design & simulation of QPSK modulator for optic inter satellite communication”
So now that i have QPSK design, I want to compare with other systems (BPSK,DUO binary,etc) and to show that QPSK is superior compared to others.
So i need some graphs with respect to parameters like BER,Q factor, wavelength,eye height, power etc.

Sorry for the trouble. Please assist me on the following.

With regards,