Hello Moh Nam,Ravil gave you good paper about coding scheme in TDM/WDM PON and overview of PON.Here i Have attached some more papers regarding your need.Find the links given below
http://www.hindawi.com/journals/isrn/2014/984157/
http://www.ijcat.com/archives/volume2/issue6/ijcatr02061003.pdf
http://paper.ijcsns.org/07_book/201107/20110727.pdf
http://www.ijcat.com/archives/volume2/issue6/ijcatr02061003.pdf