Hi shahid,
I have redesigned your system file by doing sone cirrections,but couldnt able to upload it.I have uploaded it twice
Any How ,your system having the errors due to some open port components .i suggest you to see the optiwave BPon sample in the samples library.Or you csn visit the link
Broadband Optical System Based on a Passive Optical Network (BPON)
You can design or remodify this system according to your project requirement.Change data rate and you will get the desired results.i have a question why you aee doing this for only single user for bidirectional? You can increase users by setting value at power splitter.
I will tey again to attach modified file if to do so.