yes i am still struggling with the problem. yup i will get back with changes suggested. actually simulation is taking too long for a 10 channel sytem with suggested sequence length, so i did’nt wait to complete the simulation and see results it took more than 2 hrs in transmission fiber only(3hr, 27 min) and still had to travel through HNLF. so it would have run for atleast 7-8 hrs. but now i will surely run it as i am in serious struggle to get good /min BER