Hi Gokul,
I don’t know about the WDm interleaver you have used, but your whole system seems to have been set right. However, I generally suggest always using Optisystem sample and making the necessary changes to that.
Can you please say how many subcarriers, pilot signals, etc you want to use? And I will set them for you to see as an example. In the meanwhile, please have a look at the OptiSystem OFDM sample to get an overall idea of the setting.
Regards