Hi abhishek sorry for confusing u actually i wanted to refer to post no. of alsitu #24565 in response to DQPSK by dhiman in which alsitu suggested to generate DQPSK using DPSK (which is there in optisystem 7.0). Yes screenshot i referred to suggests use of RZ insead of gaussian to generate RZ-DQPSK. i hope i am able to make it clear now.