Hi Duy le Nguyen, This timen also I am unable to open the design attached in the above reply. From the constellation I can say that your system is almost done. need to adjust little. I am using OptiSystem V13 and could better help in this if I could open the file attached. I think you need to adjust the parameters in the MZM. and a little bit rotation of constellation points are noticed. Recheck of all the phase components.
Regards,
Dhiman