hi fayiqa mam..thank u fr the help.
i tried ur solution and my eye diagram is better than before..i tried increasing the power to 15 db and i kept edfa amplifier length 6m instead of 3m.. the ber is now 0.234 e-037 which as per aabid sir is good bcz he has mentioned that higher the exponential term good is the result.. thanx agn fr the help…can i improve it more?