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Since Qpsk is not in optisystem v7 we need to make it by own using psk .But some time ago when i was using same versuon v 7 ,i tried to make qpsk and fortunately completed it .But when i started analyzing constellatin by adjusting electrical amplifier values i got saturated results.For example i increased thre distance from 10 km to 1000 km further 10000 km but results on constellation were same .Back to back system i got with sane as with transmission line.I would realy like to help you and discuss it here because if qpsk works good in 7 then it solves many problems for users.unfortunately setup that i have made ,misplaced otherwise it would help .Gagan try it by searching qpsk transmitter on google then images ,there are some optiwave screen shots of Qpsk,try to make it and we will discuss it.
Thank you
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