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Hi!Umar farooq
Welcome to optiwave,Attached paper can be implemented in optisystem.You can also takre help from optiwave samples of wdm pon,which ,in turn gives you the basic idea of how does wdm pon works .you can make changes in sample file such as change OOk to Dqpsk and receiver at user end.in this way you will get two sihnals at 45 and -45 .Yoi can use one of then as user signal detected and other one circulate and reuse it for upstream.Hope it would help you ,i will also provude you some links of similar discussion and topic which discussed here in forum containing setups too.
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