Hi Dhiman Kakali.
I’m using Optisystem V14. It maybe the reason you couldn’t open my file.
I’m very appreciated for your help. I tried to adjust the parameters in MZM.
My parameters in MZM:
Extinction ratio : 60dB; Insert loss :1dB.
And Bias voltage 1 and 2 are 0, 2
But it’s still circle constellation.
Regards